{"id":965,"date":"2025-04-25T21:15:50","date_gmt":"2025-04-25T13:15:50","guid":{"rendered":"https:\/\/www.flywing-tech.com\/blog\/how-to-withstand-electrical-stresses-in-modern-op-amps\/"},"modified":"2025-06-23T17:53:07","modified_gmt":"2025-06-23T09:53:07","slug":"how-to-withstand-electrical-stresses-in-modern-op-amps","status":"publish","type":"post","link":"https:\/\/www.flywing-tech.com\/blog\/how-to-withstand-electrical-stresses-in-modern-op-amps\/","title":{"rendered":"How to Protect Modern Op Amps from Electrical Stresses"},"content":{"rendered":"<div class=\"fsc_text\"><p class=\"\" data-start=\"73\" data-end=\"230\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">To safeguard modern op amps from electrical stresses, implement protective circuits like input resistors and transient voltage suppressors.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Employ EMI-hardened op amps to mitigate electromagnetic interference.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Ensure proper power sequencing to prevent damage during power-down scenarios.<\/span>\u200b<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\r\n<div class=\"ez-toc-title-container\">\r\n<h2 class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/h2>\r\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #023a85;color:#023a85\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #023a85;color:#023a85\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\r\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.flywing-tech.com\/blog\/how-to-withstand-electrical-stresses-in-modern-op-amps\/#what_are_the_primary_sources_of_electrical_stress_in_modern_op_amps\" >What are the primary sources of electrical stress in modern op amps?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.flywing-tech.com\/blog\/how-to-withstand-electrical-stresses-in-modern-op-amps\/#how_can_input_protection_circuits_mitigate_overvoltage_damage\" >How can input protection circuits mitigate overvoltage damage?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.flywing-tech.com\/blog\/how-to-withstand-electrical-stresses-in-modern-op-amps\/#why_is_electromagnetic_interference_emi_a_concern_for_op_amps\" >Why is electromagnetic interference (EMI) a concern for op amps?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.flywing-tech.com\/blog\/how-to-withstand-electrical-stresses-in-modern-op-amps\/#which_design_practices_enhance_emi_immunity_in_op_amp_circuits\" >Which design practices enhance EMI immunity in op amp circuits?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.flywing-tech.com\/blog\/how-to-withstand-electrical-stresses-in-modern-op-amps\/#how_does_power_sequencing_affect_op_amp_reliability\" >How does power sequencing affect op amp reliability?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.flywing-tech.com\/blog\/how-to-withstand-electrical-stresses-in-modern-op-amps\/#what_role_do_internal_protection_features_play_in_modern_op_amps\" >What role do internal protection features play in modern op amps?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.flywing-tech.com\/blog\/how-to-withstand-electrical-stresses-in-modern-op-amps\/#can_external_protection_components_complement_internal_safeguards\" >Can external protection components complement internal safeguards?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.flywing-tech.com\/blog\/how-to-withstand-electrical-stresses-in-modern-op-amps\/#are_there_specific_op_amp_models_designed_for_high-stress_environments\" >Are there specific op amp models designed for high-stress environments?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.flywing-tech.com\/blog\/how-to-withstand-electrical-stresses-in-modern-op-amps\/#buying_tips\" >Buying Tips<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.flywing-tech.com\/blog\/how-to-withstand-electrical-stresses-in-modern-op-amps\/#electronic_components_expert_views\" >Electronic Components Expert Views<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.flywing-tech.com\/blog\/how-to-withstand-electrical-stresses-in-modern-op-amps\/#faq\" >FAQ<\/a><\/li><\/ul><\/nav><\/div>\r\n<h2 data-start=\"232\" data-end=\"304\"><span class=\"ez-toc-section\" id=\"what_are_the_primary_sources_of_electrical_stress_in_modern_op_amps\"><\/span>What are the primary sources of electrical stress in modern op amps?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"\" data-start=\"306\" data-end=\"501\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Electrical stress in modern op amps can arise from overvoltage conditions, electromagnetic interference (EMI), and improper power sequencing.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Overvoltage may occur when input voltages exceed the supply rails, leading to potential damage.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">EMI can introduce unwanted signals, affecting performance.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Improper power sequencing, such as applying input signals before power supply stabilization, can also stress the op amp.<\/span>\u200b<\/p>\n<h2 data-start=\"503\" data-end=\"569\"><span class=\"ez-toc-section\" id=\"how_can_input_protection_circuits_mitigate_overvoltage_damage\"><\/span>How can input protection circuits mitigate overvoltage damage?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"\" data-start=\"571\" data-end=\"694\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Input protection circuits, including series resistors and transient voltage suppressor (TVS) diodes, can limit current and clamp voltage levels, protecting op amps from overvoltage.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Series resistors restrict current flow, while TVS diodes divert excess voltage away from sensitive components.<\/span>\u200b<\/p>\n<p class=\"\" data-start=\"696\" data-end=\"756\">Chart Title: Input Protection Components and Their Functions<\/p>\n<div class=\"group pointer-events-none relative flex justify-center *:pointer-events-auto\">\n<p>&nbsp;<\/p>\n<div class=\"tableContainer horzScrollShadows relative\">\n<table class=\"min-w-full\" data-start=\"758\" data-end=\"1200\">\n<thead data-start=\"758\" data-end=\"820\">\n<tr data-start=\"758\" data-end=\"820\">\n<th data-start=\"758\" data-end=\"776\">Component<\/th>\n<th data-start=\"776\" data-end=\"820\">Function<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"884\" data-end=\"1200\">\n<tr data-start=\"884\" data-end=\"974\">\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"884\" data-end=\"926\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Series Resistor<\/span><\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"926\" data-end=\"974\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Limits input current to safe levels<\/span><\/td>\n<\/tr>\n<tr data-start=\"975\" data-end=\"1067\">\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"975\" data-end=\"1023\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">TVS Diode<\/span><\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"1023\" data-end=\"1067\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Clamps voltage spikes to protect inputs<\/span><\/td>\n<\/tr>\n<tr data-start=\"1068\" data-end=\"1200\">\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"1068\" data-end=\"1111\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Schottky Diode<\/span><\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"1111\" data-end=\"1153\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Provides fast response to voltage transients<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h2 data-start=\"1202\" data-end=\"1270\"><span class=\"ez-toc-section\" id=\"why_is_electromagnetic_interference_emi_a_concern_for_op_amps\"><\/span>Why is electromagnetic interference (EMI) a concern for op amps?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"\" data-start=\"1272\" data-end=\"1397\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">EMI can couple into op amp circuits through power lines, signal lines, or radiation, introducing noise and potentially causing malfunction.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">High-frequency EMI can be particularly problematic, leading to erroneous outputs or oscillations.<\/span>\u200b<\/p>\n<h2 data-start=\"1399\" data-end=\"1466\"><span class=\"ez-toc-section\" id=\"which_design_practices_enhance_emi_immunity_in_op_amp_circuits\"><\/span>Which design practices enhance EMI immunity in op amp circuits?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"\" data-start=\"1468\" data-end=\"1633\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">To enhance EMI immunity, use EMI-hardened op amps that integrate filters to reject high-frequency noise.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Implement proper PCB layout techniques, such as minimizing loop areas and using ground planes.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Adding external filtering components like ferrite beads and capacitors can also help.<\/span>\u200b<\/p>\n<p class=\"\" data-start=\"1635\" data-end=\"1673\">Chart Title: EMI Mitigation Techniques<\/p>\n<div class=\"group pointer-events-none relative flex justify-center *:pointer-events-auto\">\n<p>&nbsp;<\/p>\n<div class=\"tableContainer horzScrollShadows relative\">\n<table class=\"min-w-full\" data-start=\"1675\" data-end=\"2183\">\n<thead data-start=\"1675\" data-end=\"1755\">\n<tr data-start=\"1675\" data-end=\"1755\">\n<th data-start=\"1675\" data-end=\"1703\">Technique<\/th>\n<th data-start=\"1703\" data-end=\"1755\">Description<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"1837\" data-end=\"2183\">\n<tr data-start=\"1837\" data-end=\"1927\">\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"1837\" data-end=\"1884\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">EMI-Hardened Op Amps<\/span><\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"1884\" data-end=\"1927\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Integrated filters to block high-frequency noise<\/span><\/td>\n<\/tr>\n<tr data-start=\"1928\" data-end=\"2028\">\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"1928\" data-end=\"1978\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Proper PCB Layout<\/span><\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"1978\" data-end=\"2028\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Reduces EMI susceptibility through design<\/span><\/td>\n<\/tr>\n<tr data-start=\"2029\" data-end=\"2183\">\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"2029\" data-end=\"2078\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">External Filtering<\/span><\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"2078\" data-end=\"2136\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Uses components to attenuate EMI<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h2 data-start=\"2185\" data-end=\"2241\"><span class=\"ez-toc-section\" id=\"how_does_power_sequencing_affect_op_amp_reliability\"><\/span>How does power sequencing affect op amp reliability?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"\" data-start=\"2243\" data-end=\"2408\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Proper power sequencing ensures that power supplies stabilize before input signals are applied.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Applying inputs before the op amp is powered can lead to latch-up or damage.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Using power supply supervisors or sequencing circuits can manage this process effectively.<\/span>\u200b<\/p>\n<h2 data-start=\"2410\" data-end=\"2479\"><span class=\"ez-toc-section\" id=\"what_role_do_internal_protection_features_play_in_modern_op_amps\"><\/span>What role do internal protection features play in modern op amps?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"\" data-start=\"2481\" data-end=\"2646\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Modern op amps often include internal protection features like ESD diodes and overvoltage protection circuits.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">These features safeguard against transient events and voltage spikes, enhancing reliability.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">However, external protection may still be necessary for harsh environments.<\/span>\u200b<\/p>\n<h2 data-start=\"2648\" data-end=\"2718\"><span class=\"ez-toc-section\" id=\"can_external_protection_components_complement_internal_safeguards\"><\/span>Can external protection components complement internal safeguards?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"\" data-start=\"2720\" data-end=\"2845\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Yes, external components like series resistors, TVS diodes, and Schottky diodes can provide additional protection.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">They can handle higher energy transients and offer redundancy, ensuring the op amp remains within safe operating conditions.<\/span>\u200b<\/p>\n<h2 data-start=\"2847\" data-end=\"2922\"><span class=\"ez-toc-section\" id=\"are_there_specific_op_amp_models_designed_for_high-stress_environments\"><\/span>Are there specific op amp models designed for high-stress environments?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"\" data-start=\"2924\" data-end=\"3049\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Certain op amps are engineered for robustness, featuring enhanced ESD protection, wide input voltage ranges, and EMI immunity.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Examples include the Texas Instruments LMP2231, known for its precision and low power consumption, and STMicroelectronics&#8217; EMI-hardened op amps.<\/span>\u200b<\/p>\n<h2 data-start=\"3051\" data-end=\"3066\"><span class=\"ez-toc-section\" id=\"buying_tips\"><\/span>Buying Tips<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"\" data-start=\"3068\" data-end=\"3273\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">When sourcing op amps for applications prone to electrical stress, prioritize models with built-in protection features and EMI immunity.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Fly-Wing Technology (HK) Co., Limited offers a wide selection of such components, ensuring availability even for hard-to-find parts.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Their global supplier network and Hong Kong warehouses enable competitive pricing and reduced procurement cycles.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">For optimal results, allocate up to 70% of procurement time to sourcing conventional parts, leveraging Fly-Wing&#8217;s expertise to navigate shortages and time-critical demands.<\/span>\u200b<\/p>\n<h2 data-start=\"3275\" data-end=\"3313\"><span class=\"ez-toc-section\" id=\"electronic_components_expert_views\"><\/span>Electronic Components Expert Views<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"\" data-start=\"3315\" data-end=\"3440\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">&#8220;Incorporating both internal and external protection mechanisms is crucial for op amp longevity,&#8221; says Dr. Alex Chen, Senior Analog Design Engineer.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">&#8220;Designers should not solely rely on internal safeguards but also implement external circuits tailored to their specific application environments.&#8221;<\/span>\u200b<\/p>\n<h2 data-start=\"3442\" data-end=\"3449\"><span class=\"ez-toc-section\" id=\"faq\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"\" data-start=\"3451\" data-end=\"3501\"><strong data-start=\"3451\" data-end=\"3501\">Q: What causes overvoltage in op amp circuits?<\/strong><\/p>\n<p class=\"\" data-start=\"3503\" data-end=\"3588\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">A: Overvoltage can result from input signals exceeding supply rails, inductive kickbacks, or voltage transients from external sources.<\/span>\u200b<\/p>\n<p class=\"\" data-start=\"3590\" data-end=\"3651\"><strong data-start=\"3590\" data-end=\"3651\">Q: How do EMI-hardened op amps differ from standard ones?<\/strong><\/p>\n<p class=\"\" data-start=\"3653\" data-end=\"3738\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">A: EMI-hardened op amps integrate filters and design enhancements to reject high-frequency noise, improving performance in noisy environments.<\/span>\u200b<\/p>\n<p class=\"\" data-start=\"3740\" data-end=\"3817\"><strong data-start=\"3740\" data-end=\"3817\">Q: Is external protection necessary if an op amp has internal safeguards?<\/strong><\/p>\n<p class=\"\" data-start=\"3819\" data-end=\"3904\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">A: While internal protections offer baseline safety, external components provide additional defense against higher energy transients and specific application challenges.<\/span>\u200b<\/p>\n<p class=\"\" data-start=\"3906\" data-end=\"3960\"><strong data-start=\"3906\" data-end=\"3960\">Q: Can improper power sequencing damage an op amp?<\/strong><\/p>\n<p class=\"\" data-start=\"3962\" data-end=\"4087\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">A: Yes, applying input signals before power supply stabilization can lead to latch-up or damage.<\/span> <span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">Proper sequencing ensures reliable operation.<\/span>\u200b<\/p>\n<p class=\"\" data-start=\"4089\" data-end=\"4157\"><strong data-start=\"4089\" data-end=\"4157\">Q: Where can I source reliable op amps with protection features?<\/strong><\/p>\n<p class=\"\" data-start=\"4159\" data-end=\"4244\"><span class=\"relative -mx-px my-[-0.2rem] rounded px-px py-[0.2rem] transition-colors duration-100 ease-in-out\">A: Fly-Wing Technology (HK) Co., Limited provides a comprehensive range of op amps with built-in protection, catering to various application needs.<\/span><\/p>\n<p style=\"text-align: start;\"><strong>When designing amplifier circuits, it can be a challenge to avoid an overvoltage event at the amplifier. Learn the multiple options you have for preventing damage and when an overvoltage event occurs.<\/strong><\/p>\n<p style=\"text-align: start;\">In certain operational amplifier (op amp) configurations, it is unavoidable to have an input voltage present when the supply rail is turned off. This situation often arises because sensors or other inputs are powered by a different source than the amplifier, which remains active even when the amplifier is powered down.<\/p>\n<p style=\"text-align: start;\">While op amps are equipped with internal protection mechanisms to guard against electrostatic discharge (ESD) during manufacturing, these features are not designed to withstand more severe conditions such as electrical overstress (EOS) events. To minimize the risk of damage to the op amp under these circumstances, several design enhancements and fundamental principles can be employed:<\/p>\n<ol>\n<li style=\"text-align: start;\"><strong>Input Protection Diodes<\/strong>: Incorporating external diodes across the input terminals can clamp the input voltage to safe levels, preventing excessive voltage from reaching the op amp&#8217;s internal circuitry.<\/li>\n<li style=\"text-align: start;\"><strong>Series Resistors<\/strong>: Adding small series resistors at the inputs can limit the current in case of an overvoltage condition, reducing the stress on the op amp.<\/li>\n<li style=\"text-align: start;\"><strong>Zener Diodes<\/strong>: Zener diodes can be used to provide a shunt path for excessive voltage, ensuring that the input voltage does not exceed the op amp&#8217;s maximum rating.<\/li>\n<li style=\"text-align: start;\"><strong>Voltage Clamping<\/strong>: Implementing voltage clamping circuits can effectively limit the input voltage to a safe range, protecting the op amp from overvoltage conditions.<\/li>\n<li style=\"text-align: start;\"><strong>Power Supply Sequencing<\/strong>: Designing the system to ensure that the op amp&#8217;s power supply is turned on before any input signals are applied can prevent situations where the input voltage exceeds the supply voltage.<\/li>\n<\/ol>\n<p style=\"text-align: start;\">By adhering to these design principles and incorporating appropriate protection measures, the risk of damage to the op amp due to electrical overstress can be significantly reduced, ensuring the reliability and longevity of the operational amplifier in various applications.<\/p>\n<p style=\"text-align: start;\"><strong>Protection Structures in Modern Op Amps<\/strong><\/p>\n<p><span style=\"color: #000000; background-color: #ffffff; font-size: 14px;\">First, let&#8217;s discuss the existing protection structures found in most modern operational amplifiers (op amps). Many data sheets include diagrams of these protection structures. For instance, Figure 1 in the data sheet of the OPA2991 from Texas Instruments (TI) illustrates these structures.<\/span><\/p>\n<p><span style=\"color: #000000; background-color: #ffffff; font-size: 14px;\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/span><img decoding=\"async\" style=\"width: 50%;\" src=\"https:\/\/file.flywing-tech.com\/res\/article\/2024110110241624165104a3b21e609ec8bce370b2d7560c12ce241.png\" alt=\"\" data-href=\"\" \/><\/p>\n<p style=\"text-align: center;\"><em><strong>Figure 1. A diagram of an op amp equivalent internal ESD structure<\/strong><\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: start;\">Amplifier protection structures typically include diodes on the input pins connected to the positive (VDD) and negative (VSS) supply voltages. The output also features diodes to VDD and VSS, which are integral to the amplifier&#8217;s output stage. In a class AB amplifier, the output transistors are connected to each rail, and each transistor has a P-N junction that acts as a diode to either VDD or VSS.<\/p>\n<p style=\"text-align: start;\">These body diodes are inherent and do not require additional ESD protection cells, as they are usually larger and more capable of withstanding ESD strikes than discrete ESD diodes.<\/p>\n<p style=\"text-align: start;\">Some op amps, like the TI OPA310, lack input ESD diodes to both VDD and VSS. This is often promoted as a benefit for specialized functions, such as fail-safe inputs. These specialized diode structures allow input voltage to be present when the device is unpowered, up to a certain limit.<\/p>\n<p style=\"text-align: start;\">The input diodes are designed to direct large voltage spikes of either polarity to the power rails, enabling the ESD cell to safely dissipate the energy to ground. The ESD cell remains inactive during normal operation and is typically triggered by either magnitude or edge.<\/p>\n<p style=\"text-align: start;\">Magnitude-triggered ESD cells activate when a voltage spike exceeds a certain threshold. Edge-triggered ESD cells activate in response to a fast-rising or falling edge. Given that ESD spikes can reach hundreds or thousands of volts and last less than 100 ns, the activation point is set well beyond the op amp&#8217;s normal operational range to prevent unnecessary current sink or latching due to minor overvoltages.<\/p>\n<p style=\"text-align: start;\"><strong>Diodes Connected Back-to-Back<\/strong><\/p>\n<p style=\"text-align: start;\">In some cases, diodes are connected back-to-back between the inputs of the op amp to prevent the input differential pair from experiencing a large voltage difference. These diodes are not implemented for ESD protection but are primarily designed to protect the input differential pair.<\/p>\n<p style=\"text-align: start;\">As shown in Figure 2, these diodes typically have a higher forward voltage to ensure they do not trigger during normal op amp operation. For EOS protection, these diodes usually do not need to be considered, as there are other conduction paths with lower forward voltages. However, it is important to consider these diodes for EOS analysis when a large input voltage differential is expected.<\/p>\n<p style=\"text-align: start;\"><img decoding=\"async\" style=\"width: 100%;\" src=\"https:\/\/file.flywing-tech.com\/res\/article\/202411011026452645b1b0402c7ceaacf21c4bc16c1efb6cc562a18.png\" alt=\"\" data-href=\"\" \/><\/p>\n<p style=\"text-align: center;\"><em><strong>Figure 2. OPA171\u2019s functional block diagram illustrating the back-to-back input diodes<\/strong><\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: start;\">These back-to-back input diodes were necessary in traditional op amps because a large input-voltage differential could damage the input transistors. However, in TI&#8217;s multiplexer-friendly input amplifiers, these diodes are absent. Instead, a different structure protects the input differential pair from large input-voltage differentials. Therefore, in multiplexer-friendly amplifiers, you do not need to consider back-to-back diodes between the inputs as a valid conduction path.<\/p>\n<p style=\"text-align: start;\">Let&#8217;s explore several different EOS protection structures and when they might be applicable to your design.<\/p>\n<p style=\"text-align: start;\"><strong>The \u201cMost Protection\u201d Approach<\/strong><\/p>\n<p><span style=\"color: #000000; background-color: #ffffff; font-size: 14px;\">When the function of the amplifier is a priority and the potential overstresses are somewhat unknown, it is necessary to control the potential for EOS at all pins connected to the op amp. Figure 3 illustrates a method to protect the inputs, outputs, and supply pins of a single-channel op amp.<\/span><\/p>\n<p><img decoding=\"async\" style=\"width: 100%;\" src=\"https:\/\/file.flywing-tech.com\/res\/article\/202411011029102910a57d6e7572de27ac8416a310d60da085f675f.png\" alt=\"\" data-href=\"\" \/><\/p>\n<p style=\"text-align: center;\"><em><strong>Figure 3. An op amp design with overvoltage protection on the input pins, output pins and supply pins.<\/strong><\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: start;\">The implementation shown in Figure 3 provides the most comprehensive protection for your op amp and can be used in most applications without issues. However, it is the most expensive option in terms of both printed circuit board (PCB) area and cost.<\/p>\n<p style=\"text-align: start;\">On the input pins, external diodes connected to the op-amp supply rails before resistors ensure that an overvoltage condition will flow through the external diodes instead of the op amp\u2019s internal diodes. This is because the voltage drop across R2 and R1 ensures that diodes D1 and D2 have a higher voltage than the amplifier\u2019s input ESD diodes. The external protection diodes must have an appropriate current rating and should be able to sink the current that can be generated before the op amp inputs.<\/p>\n<p style=\"text-align: start;\">The example in Figure 3 includes the BAV99 as a common diode for EOS protection. The output follows a similar convention, with diodes and resistors placed to ensure that the external diodes conduct first before the output stage diodes. This is particularly important for the output stage, as the output diodes typically have a lower forward voltage than most external protection diodes.<\/p>\n<p style=\"text-align: start;\"><strong>Secondary Purpose<\/strong><\/p>\n<p style=\"text-align: start;\">These resistors serve a secondary purpose as well. The protection diodes have parasitic capacitance, and placing a resistor between the feedback loop and the diode prevents the diodes\u2019 parasitic capacitance from loading the feedback loop, thereby maintaining loop stability.<\/p>\n<p style=\"text-align: start;\">At the supply rails, Zener diodes help protect against an overvoltage on either supply pin by providing a low-impedance path to ground when an overvoltage event occurs. The op amp remains protected from overvoltage regardless of the VDD and VSS rail\u2019s ability to sink or source current.<\/p>\n<p style=\"text-align: start;\">It\u2019s worth noting that even in this configuration, there can be some unintentional effects. If the op amp must source or sink current, there will be some voltage inaccuracy on the OUT node. Implementing the isolation resistor (RISO) with a dual feedback circuit can overcome this voltage drop.<\/p>\n<p style=\"text-align: start;\">If the supply rail is high impedance when turned off and the circuit is relying on the Zener diodes to clamp the op amp voltage, it is possible for the op amp to self-power through the protection diodes. Whatever IC follows the amplifier must be able to tolerate a voltage being present on the output of the op amp.<\/p>\n<p style=\"text-align: start;\"><strong>The Acceptable Approach<\/strong><\/p>\n<p><span style=\"color: #000000; background-color: #ffffff; font-size: 14px;\">The acceptable approach will help mitigate EOS events, but since there are internal diodes in the amplifier, it\u2019s important to leverage them carefully to prevent damage to the op amp. In the TI OPA992, OPA2992, and OPA4992 op amp data sheets, the absolute maximum ratings table (Figure 4) includes the input currents considered safe.<\/span><\/p>\n<p><img decoding=\"async\" style=\"width: 100%;\" src=\"https:\/\/file.flywing-tech.com\/res\/article\/2024110110334933495393fd6ce50475e13ff519e50004762c41fe2.png\" alt=\"\" data-href=\"\" \/><\/p>\n<p style=\"text-align: center;\"><em><strong>Figure 4. An excerpt from the OPA992, OPA2992 and OPA4992 absolute maximum ratings table.<\/strong><\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: start;\">The data sheet specifies that the input voltage must be limited to within 0.5 V of V+ or V\u2013, and must not exceed 10 mA sinking or sourcing. Additionally, the supply voltage must not exceed 42 V of potential difference between the two supply pins.<\/p>\n<p style=\"text-align: start;\">Let&#8217;s consider two potential protection scheme scenarios. In scenario No. 1, the supplies can source and sink current, and the input overvoltage condition is a known voltage (Figure 5).<\/p>\n<p style=\"text-align: start;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <img decoding=\"async\" src=\"https:\/\/file.flywing-tech.com\/res\/article\/202411011034513451d3d4ed5afe36b0179f6d7dd67c9776bc70e81.png\" alt=\"\" data-href=\"\" \/><\/p>\n<p style=\"text-align: center;\"><em><strong>Figure 5. An op amp with simple series resistor EOS protection<\/strong><\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: start;\">In Figure 5, the minimum protection necessary to protect the amplifier is to limit the input current to less than 10 mA. With 100 \u03a9 series input resistors, the maximum overvoltage condition that can be mitigated at inputs IN+ and IN\u2013 is 1 V above or below the supply rail. If the overvoltage condition is going to be a sustained event\u2014for example, a sensor providing an input voltage when the supplies are turned off\u2014then you will want to further limit the current.<\/p>\n<p style=\"text-align: start;\">Reducing the stress condition below the maximum allowable condition is similar in concept to capacitor voltage derating, where operating well below the limit will put less stress on the system than operating at the limit. For an absolute maximum input current of 10 mA, limiting the input current to less than 1 mA will help further mitigate the potential for damage in the case of a sustained overvoltage event.<\/p>\n<p style=\"text-align: start;\"><strong>Scenario Number 2<\/strong><\/p>\n<p><span style=\"color: #000000; background-color: #ffffff;\">In scenario No. 2, the overvoltage condition is a known voltage, and supplies are high Z; for example, there is a low-voltage amplifier that must be resilient to a short-to-12V battery voltage (V<\/span><span style=\"color: #000000; background-color: #ffffff; font-size: 12px;\"><sub>BAT<\/sub><\/span><span style=\"color: #000000; background-color: #ffffff;\">) condition on the input (Figure 6).<\/span><\/p>\n<p><span style=\"color: #000000; background-color: #ffffff;\"> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span><img decoding=\"async\" style=\"width: 50%;\" src=\"https:\/\/file.flywing-tech.com\/res\/article\/202411011036203620e4d5c73d486ebbd0a502cd76fc1c80be4758b.png\" alt=\"\" data-href=\"\" \/><\/p>\n<p style=\"text-align: center;\"><em><strong>Figure 6. An op amp with series resistor input protection with an added Zener diode on the supply rail<\/strong><\/em><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #000000; background-color: #ffffff; font-size: 14px;\">With a supply voltage of 5 V, the difference between a 12 V short condition and the 5 V amplifier supply is 7 V. To prevent this short condition from sourcing more than 10 mA into the amplifier, you need a 700 \u03a9 resistor on the input. To limit the current to under 1 mA, you need a 7 k\u03a9 resistor. Adding a standard and common resistor value, a 10 k\u03a9 series resistor on the input of the amplifier should limit the current to a safe level. To confirm that this series resistor will protect the op amp, refer to the absolute maximum ratings of the TI TLV9002, shown in Figure 7.<\/span><\/p>\n<p><img decoding=\"async\" style=\"width: 100%;\" src=\"https:\/\/file.flywing-tech.com\/res\/article\/20241101103737373721fe13cbf2317aec93154308ec899dd8044b5.png\" alt=\"\" data-href=\"\" \/><\/p>\n<p style=\"text-align: center;\"><em><strong>Figure 7. Excerpt from the absolute maximum ratings table for the TLV9002 op amp<\/strong><\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: start;\">Adding a Zener diode from VCC to ground, with a reverse voltage of 6 V, will prevent the op amp supply pin from exceeding the absolute maximum rating of 7 V. In cases where the supply can source and sink current, the supply rail will be able to properly regulate and protect the supply voltage of the amplifier without the need for a Zener diode.<\/p>\n<p style=\"text-align: start;\">You must also consider the input voltage, which is limited between (V\u2013) \u20130.5 V and (V+) +0.5 V. A short-to-12V VBAT condition does violate the input-voltage limitation; however, there is a footnote in Figure 7 that specifies that if the input signal is outside the supply rails, it must be limited to 10 mA or less. The ability to meet this condition greatly reduces the likelihood of damage and does not violate the ratings in the absolute maximum table.<\/p>\n<p style=\"text-align: start;\">Figure 8 summarizes these design requirements.<\/p>\n<p style=\"text-align: start;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<img decoding=\"async\" style=\"width: 50%;\" src=\"https:\/\/file.flywing-tech.com\/res\/article\/20241101103843384370b74454a9ed08ea1c0b8cb782de280410c46.png\" alt=\"\" data-href=\"\" \/><\/p>\n<p style=\"text-align: center;\"><em><strong>Figure 8. A flow chart for which EOS protection scheme is relevant to your application<\/strong><\/em><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: start;\"><strong>All About Preventing Damage<\/strong><\/p>\n<p><span style=\"color: #000000; background-color: #ffffff; font-size: 14px;\">In amplifier circuit design, it can be an unavoidable circumstance to have an overvoltage event at the amplifier. The resources in this article should equip you with multiple options that fit various cost restrictions, as well as internal IC limitations, to help prevent damage to the IC when an overvoltage event occurs. In future designs, these guidelines can help you build circuits that can withstand these events without damage.<\/span><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>To safeguard modern op amps from electrical stresses, implement protective circuits like input resistors and transient voltage suppressors. Employ EMI-hardened op amps to mitigate electromagnetic interference. Ensure proper power sequencing to prevent damage during power-down scenarios.\u200b What are the primary sources of electrical stress in modern op amps? Electrical stress in modern op amps can [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":966,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[94,379],"tags":[96,97,95,98],"class_list":["post-965","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analog-circuit-design","category-circuit","tag-electrical-stress","tag-emi-hardened-op-amps","tag-op-amp-protection","tag-transient-voltage-suppression"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>How to Protect Modern Op Amps from Electrical Stresses - Fly-Wing<\/title>\r\n<meta name=\"description\" content=\"Learn how to protect modern operational amplifiers from electrical stresses, including overvoltage, EMI, and improper power sequencing, using proven protection techniques and components.\" \/>\r\n<meta 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