{"id":3465,"date":"2026-09-29T04:11:18","date_gmt":"2026-09-28T20:11:18","guid":{"rendered":"http:\/\/www.zonesports7.com\/blog\/?p=3465"},"modified":"2026-09-29T04:11:18","modified_gmt":"2026-09-28T20:11:18","slug":"what-is-the-schottky-diode-s-behavior-under-reverse-bias-stress-4ed4-62d893","status":"publish","type":"post","link":"http:\/\/www.zonesports7.com\/blog\/2026\/09\/29\/what-is-the-schottky-diode-s-behavior-under-reverse-bias-stress-4ed4-62d893\/","title":{"rendered":"What is the Schottky Diode’s behavior under reverse bias stress?"},"content":{"rendered":"

Hey there, if you\u2019ve ever worked with Schottky diodes long enough, you\u2019ve probably heard the word \u201creverse bias stress\u201d thrown around like it\u2019s some kind of dark magic that\u2019ll turn your diode into a paperweight. As a Schottky diode supplier that\u2019s been around the block (we\u2019ve shipped parts to everyone from small startup labs to aerospace engineering teams, so trust me on this), I get why this stuff can feel confusing. A lot of folks reach out to us panicking because their diodes are failing under reverse bias and they can\u2019t figure out if it\u2019s a part issue, an application issue, or just how these things work under pressure. Let\u2019s break this down like we\u2019re chatting over a coffee (skip the fancy lab jargon where we can, but I\u2019ll keep it accurate because that\u2019s why you\u2019re here). Schottky Diode<\/a><\/p>\n

<\/p>\n

First, let\u2019s recap what a Schottky diode is, real quick, because if you skip this, reverse bias stress won\u2019t make any sense. Unlike regular PN junction diodes that use two doped semiconductors (like silicon n-type and p-type), Schottky diodes use a metal-semiconductor junction. That metal-semiconductor junction is the whole star of the show, and it\u2019s exactly what behaves differently when you apply reverse bias. Forward bias is when you push current through the diode easily\u2014Schottkys are known for lower forward voltage drop, which is why people love them for things like switching power supplies, battery charging circuits, and solar panels. Reverse bias is the other side: when you apply voltage that makes the metal side negative and the semiconductor side positive, so ideally almost no current flows. That\u2019s the \u201coff\u201d state, right?<\/p>\n

Reverse bias stress is basically when you keep applying that reverse voltage for a long time, or cranked up higher than the diode\u2019s rated reverse breakdown voltage, over and over. A lot of people new to diodes mix up reverse leakage current (the tiny little current that still flows when reverse biased, which is normal) and reverse bias stress (which causes damage over time). Let\u2019s clarify that first: leakage is like a leaky faucet that still works, stress is like leaving the faucet open so long it rusts the pipe.<\/p>\n

So what actually happens to the Schottky junction under reverse bias? Let\u2019s get down to the physics, but make it simple. When you apply reverse bias, you\u2019re pulling electrons away from the metal-semiconductor junction, right? That creates a depletion region\u2014an area with very few charge carriers, sort of like an empty buffer zone between the metal and the semiconductor. For PN junction diodes, that depletion region is mostly in the lightly doped semiconductor side, but Schottky junctions are different because the semiconductor doping is typically higher. Wait, no\u2014actually, the depletion region in Schottkys is thinner than in a comparable PN junction, that\u2019s part of why their forward voltage is lower. But that thin depletion region is also their Achilles heel when reverse bias is involved.<\/p>\n

Under continuous reverse bias, electric field starts building up in that depletion region. If you stay under the rated reverse voltage (Vr) listed on the diode\u2019s datasheet, that field stays within safe limits\u2014no problem, the diode will just sit there with that tiny leakage current, no issues even over years. But if you push it above Vr, or keep it at a high reverse voltage for extended periods, that electric field gets strong enough to do two main bad things, depending on the diode\u2019s material and design.<\/p>\n

First, there\u2019s avalanche breakdown. That\u2019s when the electric field is so strong it slams electrons loose from their atoms in the semiconductor, creating more electrons and holes, which then slam into other atoms, causing a cascade of current. For regular diodes, that\u2019s basically what happens when they break down. But Schottkys have a lower avalanche breakdown voltage than many PN diodes because that thin depletion region. Wait, but there\u2019s another thing specific to Schottkys: hot carrier injection, or sometimes called Schottky barrier lowering. That\u2019s the tricky one that\u2019s not as talked about as avalanche, but it\u2019s way more common in real-world reverse bias stress situations.<\/p>\n

Here\u2019s how hot carrier injection works, in plain terms. The metal-semiconductor barrier is what keeps current from flowing reverse, right? But when you apply reverse bias, and the electric field in the depletion region is cranked up, some of the charge carriers (electrons, usually, since Schottkys use n-type semiconductors most of the time) get enough energy to jump over that barrier, even if they don\u2019t have enough energy normally. Those are \u201chot carriers\u201d\u2014high-energy charge carriers that don\u2019t behave like the sleepy, low-energy ones we see under forward bias.<\/p>\n

Now, what do these hot carriers do? They bang into the crystal lattice of the semiconductor, knocking loose atoms or creating defects in the material over time. That\u2019s called device degradation, and it\u2019s gradual at first\u2014hard to spot. At first, your reverse leakage current will start creeping up, not by much, maybe just a few microamps. That\u2019s a warning sign, like your car\u2019s check engine light being on for a tiny problem. If you keep pushing, keep applying reverse bias stress without fixing whatever\u2019s causing it (maybe a bad design, or a diode that was rated too low for your circuit), those defects pile up. Eventually, the barrier gets messed up enough that leakage current spikes, and the diode might start leaking so much it can\u2019t turn off anymore, or even short out entirely.<\/p>\n

Wait, let\u2019s make this real with an example, because examples stick. Last year, we had a customer come to us from a small automotive startup. They were using our 100V Schottky diodes in a battery management system (BMS) for electric motorcycles. Their circuit required the diodes to hold 95V reverse continuously, which was under our rated 100V Vr, or so they thought. But here\u2019s the catch: automotive circuits have voltage transients\u2014spikes that happen when the engine is turned on, or when the battery is connected wrong. They didn\u2019t account for a 120V transient that lasted 10 milliseconds every time they started the bike. Over a month of testing, those transients were acting like repeated reverse bias stress pulses, and the diodes\u2019 leakage current went from 1\u00b5A to 2mA, which was way too high for their BMS to work.<\/p>\n

They were worried it was a bad batch of diodes, so they sent us samples, and we tested them in our lab. Turns out, it wasn\u2019t the diodes\u2019 fault\u2014they were correctly rated for 100V, but the application had transient reverse bias stress that they didn\u2019t calculate for. We recommended they step up to our 150V Schottkys, which have a higher breakdown voltage and thicker depletion region that handles those transients way better, and added a small TVS diode to clamp the spikes. That fixed their problem, and they\u2019ve been a repeat customer ever since. That\u2019s the kind of stuff we deal with every day, so we know reverse bias stress isn\u2019t just a theory\u2014it\u2019s a real pain point that comes down to matching the diode to the application.<\/p>\n

Now, let\u2019s clear up some common myths about Schottky diodes and reverse bias stress. First myth: \u201cAll Schottkys fail immediately under reverse bias.\u201d No\u2014if you stay within the datasheet ratings, they\u2019re super reliable. The 1mA reverse leakage we mentioned earlier? That\u2019s normal for most Schottkys, and it doesn\u2019t cause degradation over time. Second myth: \u201cReverse bias stress only happens when you exceed breakdown voltage.\u201d Not always. Even if you stay under Vr, if you\u2019re at a high reverse voltage for thousands of hours, you can get gradual hot carrier degradation. It\u2019s not as fast as breakdown, but it\u2019s a real issue for long-lifetime applications, like industrial power supplies that are supposed to run 24\/7 for 10 years. Third myth: \u201cSchottkys are worse than PN diodes for reverse bias.\u201d It depends. If your application is switching frequencies above 100kHz, Schottkys are way better because of their lower reverse recovery time\u2014PN diodes have that stored charge that causes extra loss when turning off. Reverse bias stress capability is just one part of the equation; you have to balance that with your other performance needs.<\/p>\n

Another thing that affects reverse bias stress behavior: the type of Schottky diode. Ohmic contact Schottkys, barrier metal type\u2014wait, no, more practical stuff: silicon vs. silicon carbide (SiC) Schottkys. SiC Schottkys are a newer option, and they handle reverse bias stress way better than regular silicon ones. Their depletion region is much wider, so avalanche breakdown happens at higher voltages, and hot carrier injection is way less likely. We have a lot of customers using SiC Schottkys for solar inverters, which need to hold reverse voltage for decades without failing\u2014their reverse leakage is almost zero even at high reverse bias, so they don\u2019t have that degradation issue. But SiC is more expensive, so it\u2019s all about trade-offs. If you\u2019re building a consumer gadget that only needs to last 2 years, a regular silicon Schottky is fine. If you\u2019re building a wind turbine component that needs to last 25 years, SiC is probably worth the extra cost for that reverse stress reliability.<\/p>\n

Wait, also, what about temperature? Temperature is a huge factor in reverse bias stress. The hotter the diode gets, the more severe reverse bias stress is. High temperatures make charge carriers more mobile, so hot carriers have more energy to cause defects. We did a test last quarter where we put our 60V silicon Schottkys under 55V reverse bias at 25\u00b0C (room temp) for 1000 hours\u2014leakage stayed at 0.8\u00b5A, no change. Then we did the same test at 125\u00b0C, which is the max operating temp for most of our standard Schottkys. After 500 hours, leakage had jumped to 12\u00b5A, and after 1000 hours, it was 45\u00b5A. That\u2019s a massive difference. So if your circuit runs hot (like a power supply in a small enclosure with no airflow), you need to derate your diode\u2019s reverse voltage, not just use the rated Vr at room temp. That\u2019s a mistake a lot of engineers make\u2014they look at the datasheet Vr at 25\u00b0C and don\u2019t account for derating at higher temps.<\/p>\n

What can you do to avoid reverse bias stress issues, if you\u2019re designing a circuit? We get asked this all the time, so here\u2019s our go-to list of practical tips, not just theory. First, calculate all the reverse voltages your diode will ever see, including transients. Don\u2019t just use the nominal reverse voltage\u2014add a safety margin. A good rule of thumb is to pick a diode with a rated reverse voltage 20-30% higher than the maximum reverse voltage in your circuit, and more if there are big transients. Second, pay attention to operating temperature. If your diode will run at 100\u00b0C, derate the reverse voltage by at least 15% from the room temp rating. Third, if your application needs long lifetime (industrial, aerospace, solar), consider SiC Schottkys instead of silicon\u2014they handle reverse stress way better. Fourth, watch out for overvoltage events, like reverse polarity or load dumps in automotive circuits. Adding a simple Zener diode or TVS across the Schottky can clamp those spikes before they damage it.<\/p>\n

And if you do end up with a diode that\u2019s failing from reverse bias stress, don\u2019t just blame the diode. Most of the time, it\u2019s a mismatch between the part and the application, not a bad batch. We\u2019ve had customers send us diodes that were failing, and when we test them, the problem is that they were using a 20V diode in a circuit that needed 30V reverse, no derating, running at 100\u00b0C. That\u2019s not a part defect\u2014that\u2019s an application mistake. But if you come to us with your circuit specs, we can help you pick the right Schottky, whether it\u2019s standard silicon, high-temperature rated, or SiC, to avoid those issues.<\/p>\n

<\/p>\n

At the end of the day, reverse bias stress isn\u2019t something to fear\u2014it\u2019s something to understand. Schottky diodes are awesome for so many applications because of their speed and low forward drop, but that metal-semiconductor junction does have its limits under reverse voltage. The key is matching the diode\u2019s ratings to your actual circuit conditions, not just the datasheet numbers on a random part you found online. We\u2019ve been helping engineers do that for years, so if you\u2019re dealing with reverse bias stress issues in your designs, or just need to pick the right Schottky for your next project, feel free to reach out. We don\u2019t do hard sells\u2014we\u2019ll tell you if a standard part works, or if you need something custom, no pressure.<\/p>\n

Digital Transistors<\/a> REFERENCES<\/p>\n

    \n
  1. Sze, S. M., & Ng, K. K. (2006). Physics of Semiconductor Devices (3rd ed.). John Wiley & Sons.<\/li>\n
  2. Bhatnagar, M., & Baliga, B. J. (1993). Silicon carbide Schottky barrier diodes. IEEE Transactions on Electron Devices, 40(2), 645-655.<\/li>\n
  3. National Semiconductor Application Note. (1998). Understanding Schottky Diode Reverse Bias Behavior and Reliability.<\/li>\n<\/ol>\n
    \n

    Tongke Electronic Co., Ltd<\/a>
    Tongke Electronic Co., Ltd. is one of the most experienced schottky diode manufacturers and suppliers in China, featured by quality products and low price. Please rest assured to wholesale advanced schottky diode made in China here from our factory. Contact us for pricelist.
    Address: No.3,Chayuan Rd, Street 3, AilingKan, Dalingshan, Dongguan, Guangdong, China.
    E-mail: jack@ctk-elec.com
    WebSite:     https:\/\/www.ctkchip.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Hey there, if you\u2019ve ever worked with Schottky diodes long enough, you\u2019ve probably heard the word … What is the Schottky Diode’s behavior under reverse bias stress?<\/span>Read more<\/a><\/p>\n","protected":false},"author":345,"featured_media":3465,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3428],"class_list":["post-3465","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-schottky-diode-4aca-6328d2"],"_links":{"self":[{"href":"http:\/\/www.zonesports7.com\/blog\/wp-json\/wp\/v2\/posts\/3465","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.zonesports7.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.zonesports7.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.zonesports7.com\/blog\/wp-json\/wp\/v2\/users\/345"}],"replies":[{"embeddable":true,"href":"http:\/\/www.zonesports7.com\/blog\/wp-json\/wp\/v2\/comments?post=3465"}],"version-history":[{"count":0,"href":"http:\/\/www.zonesports7.com\/blog\/wp-json\/wp\/v2\/posts\/3465\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.zonesports7.com\/blog\/wp-json\/wp\/v2\/posts\/3465"}],"wp:attachment":[{"href":"http:\/\/www.zonesports7.com\/blog\/wp-json\/wp\/v2\/media?parent=3465"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.zonesports7.com\/blog\/wp-json\/wp\/v2\/categories?post=3465"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.zonesports7.com\/blog\/wp-json\/wp\/v2\/tags?post=3465"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}