It's going to be 450kΩ for you UK guys out there. What does this mean? Well, here in the US, your highest supply voltage is likely going to be 120V, meaning your grounding path should have at least a 240kΩ of resistance. As far as I know, this is the de-facto standard companies live and die by for ESD protocol.įor safety reasons, Jedec says your ESD equipment should conduct less than 0.5mA from the highest nearby supply voltage to ground.
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One of their standards, JESD625-A covers "Requirements for Handling Electrostatic-Discharge-Sensitive Devices".
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If it makes an audible sound, I know you're doing something wrong.įor those of you that don't know, Jedec is a standards organization covering just about everything I can think of. If you can see a flash from you to your ESD discharge area I think you're doing something wrong. Don't do that! It's about the quickest way to ensure death that I can think of.
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If you saw a small flash and heard the crack then it was safe to use." - James Turner " Back in the old days if ever we were unsure the easiest way to test it was deliberately charge youself up as much as possible, grab the metal part of a screwdriver (tightly I might add or you feel the shock) then touch whatever we were using as the earth with the tip of the screwdriver. I found a link to a hobbyist ESD guide, and some of the comments scared the hell out of me. Let me start off by saying what you should not do. All of these components are neither cheap enough (for me anyway) nor rugged enough to forego ESD protection at all. This is especially true if you're working with high-power (ironic, isn't it?) or high-speed devices. They've come a long way over the years, but they still need a bit of consideration when handling. In the analog realm, mosfets are notoriously bad. Also along the same line of thought FPGAs sometimes have very poor protection. Peripheral support circuitry for these is also sensitive: RAM, fast A/D's, and network communication to name a few. If you're working with a 32-bit microcontroller such as an ARM or a TMS, ESD can be a very serious problem. What components are not ESD-tolerant then? The most commonly-damaged components I've personally seen are higher-end digital components. When you're ready to come back later, remember where this guide is. If your idea of electronics is an 8/16-bit micro, a 555 timer, and a 7805 for power, you're fine. While it's rarely enough protection that they will survive if you go out of your way to try and damage them, it's sufficient for casual handling.
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Nowadays msot components are designed to take a good bit of ESD abuse. Well, some of this is true sometimes, sometimes not. The usual justification is that components are cheap, ESD problems are rare, etc. I've seen the above argument from hobbyists more than I care to mention. Finally, I'm a college student with an insatiable curiosity and desire to build things, but without the extra income to spend on non-essential items.
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On a somewhat related note, I am a certified IPC Specialist (sounds fancier than it is), which basically means I had professional training in soldering, including surface mount work. I have also held a job for about a year at a military contractor where ESD training and compliance inspections were required. As of the present time while this guide is being written I am a Master's student in electrical engineering, showing I have the knowledge, or at least research skills, to talk about an electrical topic. I will attempt to always begin my guides with a bit of background information to let you know why I'm qualified to speak on the topic. The ESD (Electro-Static Discharge) Guide for the Hobbyist