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ElectroStatic Discharge, it's caused by accumulation of electrostatic charge as a result of rubbing, and can damage semiconductor devices like integrated circuits.

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I am currently encountering an issue with my custom circuit that utilizes the Microchip USB2514B/M2 USB 2.0 Hub Controller for programming an EC200 cellular module (using its USB interface). Setup ...
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I have use debouncing circuits for simple mechanical switches (which are connected to the left side of the schematic) It worked just fine on production and a number of devices are deployed in fields. ...
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I have a fully enclosed plastic Battery (1S2P) that mates to a plastic, enclosed hand-held electronics device. Both are IP67 rated. If I handle the device too much, I can build up a static charge ...
MaxwellEE's user avatar
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As a hobbyist I am planning to build a PCB that reads temperature and pressure sensors with ADC. The signal voltage ranges from 0 to 5V. There might be a situation when someone by mistake connects 12V ...
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I am designing a 4 layer PCB that will utilize a 900 MHz RF radio that requires a 50 ohm impedance trace going to an SMA connector. This PCB will be inside an aluminum NEMA enclosure, outdoors, and ...
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I am developing a custom board based on the (STM32F407G-DISC1) MB997E reference design. The original design uses EMIF02-USB03F2 for USB ESD/EMI protection, but since this part is now obsolete, I have ...
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I'm a complete novice (Worse: I'm a software engineer), so please assume I don't know even some fairly basic things :) Summary: I'm trying to figure out what kind of TSV ESD protection diode might be ...
nago Snow's user avatar
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Is it necessary to connect CC1 and CC2 with an ESD protection chip? CC1 and CC2 are already connected to ground through resistors.
Ahtisham A's user avatar
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Have a relay with a built-in flyback diode. Preparing to do some ESD testing and am uncertain if the input to the relay needs any ESD protection. I understand that IC inputs and other more sensitive ...
Joe Nestor's user avatar
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I am designing a PCB board that features the ESP32 as the microcontroller. The UART pins will connect to an external HMI LCD, specifically the TJC (a Chinese version of Nextion), through a screw ...
Ahtisham A's user avatar
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I have two systems connected via a shielded cable that carries both data and power. I'm trying to minimize EMI both inside and outside the system and also I want to protect my system from ESD. I ...
mete5050's user avatar
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I'm new to ESD protection. Please correct if you find any errors, but here's what I've been told. With data lines D+ and D-, it's best for the ESD diode to have as low junction capacitance as ...
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I saw in multiple Colpitts oscillator circuit a 1N914 diode from gate to GND. Is that how one can protect the gate of an JFET? My circuit:
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Please review my protection circuits for ESD and reverse polarity supply. I have an existing circuit for a RGBW LED driver (grey portion of diagram below) and want to add some input protection to it (...
jonathanjo's user avatar
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I would like to measure a few signals running on my board while there is an ESD event occurring near the board. I have an ESD gun that I discharge near the board. The problem that I see is that the ...
DRF's user avatar
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I am designing a PCB board for industrial purposes, where I will connect industrial sensors that output both 0-10V and 4-20mA analog signals. I've created a circuit that can accept both input types, ...
Ahtisham A's user avatar
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We are working on this Microcontroller -100pin, E51. We have 2 pins that we have configured as output. During normal operation, these 2 (Pin 1 and Pin 4) pins have been failed. Upon doing analysis, we ...
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The problem! The power supply can be 5/12/24V, and up to 15A. The USB is always 5V, and up to 0.5A. For this reason, I can't use a simple series diode to stop reverse polarity from the power-supply. ...
Mitch McMabers's user avatar
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I've built a custom landscape lighting system. It consists of a number of "strings" of series-connected LED luminaires, each controlled by a current source (LT3081 regulator). The voltage on ...
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My current project is a device with the following external interface: simulate this circuit – Schematic created using CircuitLab The design requirements are the following: ±16-kV HBM ESD ±8-kV ...
ElectronicsStudent's user avatar
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I'm designing an SD card interface for a 3.3V system and would appreciate a review of the schematic I've put together. The goal is to safely interface with a microSD card in 4-bit mode, provide robust ...
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I have a PCB with the a Xilinx CPLD and the TDI, TDO, TCK, TMS pins close to the JTAG programming header (2.54mm) have ESD suppressors (BZA868AVL). What is the purspose of these diodes on these pins?
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I have a PCB design with a TVS diode across the battery terminals for ESD protection. On the top layer of my board, it is connected with a short wide trace to the battery terminals like so: However, ...
Ryderr's user avatar
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I'm designing an electronic board for an FPGA-based fluence counter (Z-turn Board V2, Xilinx XC7Z020) that handles three high-frequency input signals: 3.3V TTL BNC input. 5V TTL BNC input, converted ...
Neitsab's user avatar
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I have an ESP32 hooked up to an SD card over SPI, with the lines directly connected. I bought a bunch of cheap SD cards off Amazon, and at some point, my ESP32 got fried. After some troubleshooting, I ...
user's user avatar
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I am designing a medical product which is fully isolated (class II) with a plastic enclosure (no chassis connected to earth). I am concerned about ESD protection as I have an electrode at the output ...
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The schematic of this PIR breakout board has D1, a bidirectional TVS diode connected in parallel to the decoupling capacitor C1. My understanding is that the TVS diode is used as ESD protection, but ...
spanito's user avatar
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I'm trying to protect a GPIO pin on an nRF52840 I'm using a push button input from ESD. The standard we are testing against is IEC 61000-4-2 level 4 which is 6kV contact at 22.5A. The GPIO is using ...
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I am currently making a small device similar to the BBC micro:bit and I wanted to use a MOSFET as the main power switch (which the uC controls). However the only problem is that my device is an open ...
16-bit-apps's user avatar
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I am designing an RS485 interface and need to put ESD protection in place. For Power Supply I am adding a TVS between PWR and GND. For the A+ and B-, I am planning to do the same TVS to the GND. Is ...
user14665305's user avatar
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Most TVS diodes seem to have a breakdown voltage higher than 5V and a clamping voltage even higher than this. This TVS diode meant for USB applications from TI has a breakdown voltage of 6.7V and ...
James Scholl's user avatar
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5 answers
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Are there N-MOSFET parameters which indicate a more robust gate, able to better withstand ESD, too high or too low voltage (at the gate) and be less prone to fail? The question is NOT about how to ...
Fredled's user avatar
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When ESD protection is done between connector and magnetic transformer, I think the bidirectional diode is best suited since the signals are bipolar. Why unidirectional diodes are applied in reference ...
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I am watching this video, and the datasheet for the 74ls245, and what I saw was that the ESD voltage is >3500 Volts, but the input voltage Ben Eater uses is 5 ...
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Generally TVS diode curves are shown as (Source https://www.ti.com/document-viewer/lit/html/SSZT784) With the left most being a uni directional and right being bi directional TVS diode. TVS diodes ...
MRB's user avatar
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I use an ESP32-S3-WROOM-1-N16R8 (Datasheet) together with a USB connector which allows me to flash it easily. But do I need some extra ESD protection for the USB? I added a USBLC6-2SC6 to the ...
Tintenfisch's user avatar
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I should to place a PCB in a metallic enclosure having an Ethernet and and USB port. The connectors are placed on dedicated small PCBs mounted on enclosure and connecting to the main PCB by cables. I ...
Rasool's user avatar
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I have some confusions about ESD and what circuit need to be protected against ESD. Suppose I have a board in a metallic box. In one case the board is connected to the metallic box and in the other ...
Jess's user avatar
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In datasheets (for ex. this or this) I can see that ICs have an integrated protection against voltage transients. So should I add additional protection as TVS diodes? My reasoning is no, as open-case ...
Radar32's user avatar
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I have made two pcb layouts, one very similar to texas instruments example circuits and one that is more space efficient. Which layout is the better one? Will the second one perform worse? If yes, why?...
Marvin W's user avatar
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I'm building a DMX transmitter, and follow the Texas Instruments guideline on IEC ESD, EFT, and surge resistant RS-485 circuits, having the following configuration at the moment: The MOVs clamp the ...
Marvin W's user avatar
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I want to connect bare hard drives which are meant for internal use via a SATA/IDE to USB adapter or something similar. That means that the drives will be operating outside of any sort of casing. The ...
tinkRR's user avatar
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I've seen the hourglass like copper structure on a PCB board and the silk suggests it's ESD protection. It's sitting close to the USB port. I've never seen this. Does anyone have information about: ...
le_top's user avatar
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I want to use an STM32F103 Microcontroller and power it with USB + get some data from the Microcontroller via the USB D+/D- lines. Now this is the refference design I came up with, using the AN4879 ...
Cats's user avatar
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I am working on a circuit where a relay controls the output of a mono jack. Recently, I was informed that it might be necessary to incorporate ESD or other transient voltage protection into connectors ...
ShawnH's user avatar
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There is a BQ4050 battery management IC and its reference design schematic. In the below image, there is a spark gap symbol I think labeled as E2, E3, and E4 between battery inputs and GND. I want to ...
Shamurov's user avatar
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1 answer
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I want to select a ESD protection IC for my circuit with the following conditions: Battery based and ultra-low-power Battery voltage 3.6 V My sensitive chips inside my circuit has Absolute Maximum ...
Andromeda's user avatar
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5 votes
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We're building a device which takes its input power from a 12VDC wall wart PSU, and has a metal chassis. We just passed preliminary EMC/EMI test, but in the ESD test an 8kV jolt to the chassis killed ...
Timo's user avatar
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I am conducting ESD testing on two types of materials with a setup that closely follows the 61000-4-2 standard. We have incorporated both isolation material and a ground plane into our setup. When I ...
DRF's user avatar
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There are two Weller WECP-20 soldering stations. One blue and one black. The black one has a label "ESD SAFE" and the blue have no ESD label at all. But is the blue Weller WECP-20 still ESD ...
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