Questions tagged [esd]

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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TVS Diode current flow at breakdown

This was a question asked to us by our client.The question is 'We have a TVS diode with a break down voltage of 31V.When a pulse of amplitude 31.7V and a duration of 100ms second is applied the diode ...
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Grounding ESD Table

I work in a manufacturing plant and we are setting up new ESD benches. Essentially, the table is grounded to the ceiling of the building and then multiple work benches are connected to that bench with ...
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Balancing high voltage and ESD safety for a work bench [closed]

I own various large stainless steel benches which I'm using to sit heavy equipment (200kg+ per bench). Some of this equipment will need new electronic components i'll have to wire up, such as 120vac ...
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Can air itself be theoretically considered as a (very poor) wireless ESD grounding strap?

There are many kinds of questionable ESD wriststraps available which claim to provide ESD protection "wirelessly". When asked about how exactly they work, they cite dubious claims about ...
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ESD Workstations in Manufacturing Facility

I am a manufacturing engineer for a company that just inherited a large electrical build. I am struggling to find ESD information for multiple workbenches. This is my last resort so I am hoping you ...
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Is external ESD protection needed with the MAX3051?

I'm currently doing my first Project using custom PCBs. It's a CAN based system to control things around my house (lights, blinds, sound, etc.). I'm planning to use multiple STM32F103C6 (in Form of a ...
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How to select ESD TVS diode? [closed]

This is the following specification of my circuit Vin 8V to 32V The breakdown voltage should be 33V of TVS I don't know what clamping voltage means please simplify it for me What should be Vc?
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MCU Input ESD Protection + debounce

I'm working on a device which requires reading from a reed switch (slow, water meter) which should work in a bit noisy environment (a few relays switching back/forth on the same board, triacs and ...
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Plugging in USB causes MCU to die

I have seen the below circuit at work. It has two supporting circuits on one PCB, each with its own ground. The circuit with the micro-USB is tied to the MCU circuitry via L3, L4, and C30. The MCU ...
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Power line configuration [closed]

For power, which configuration is best? Fuse first, followed by an ESD diode ESD diode first, and the fuse next
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How can I protect MCU SWD portf from ESD?

I have connected two TVS diodes close to header, and Resistor for limiting the current. Is it enough to protect the ports from ESD or i need to add anything else or correct this schematics?
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Using a Plug-In AC/DC adapter Output's Negative as Earth GND

Now, this is not a general question about any plug-in 12V DC supply with a barrel connector output. They are all different. There are those without Eath GND wire in the AC power input, those with it, ...
morzh's user avatar
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Why do they ship a metal sheet with the breadboard?

My breadboard came with a metal sheet: The breadboard should hardly be ESD sensitive. And if it would be, then there's still the double sided tape separating the breadboard from the metal sheet. From ...
Thomas Weller's user avatar
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Spikes appearing on the UART pins of Microcontroller when connecting to supply

I am using STM32G0c8t6 microcontroller to make a BLDC motor controller. I am connecting the Rx and Tx of UART to a VCU and they are sharing the same battery. Apart from these, there is no other ...
Gladson Thomas's user avatar
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How can I utilize PSpice for ESD simulation?

Issue: I do not know how to build a ESD simulation model in PSpice Orcad capture. Question: What is wrong with the simulation circuit? The simulation result seems like the ESD is not discharging ...
Waterview Dodo's user avatar
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Arduino Uno ESD ruggedness

I want to route one of the Arduino's digital output pins out of a device, to interface with other instruments via a several meter long coax cable. Typically, I would implement measures against ESD for ...
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Is a 100 Ω/1 nF RC low-pass filter enough to protect a microcontroller I/O pin from ESD?

While researching ESD protection on this site, I came across this question. The answer by Peter Smith contains a comment by @Ale..chenski: Just a nit pick: if you can afford 100R and 1nF to ground on ...
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ESD protection when reverse stand-off voltage and required clamping voltage are close together

The circuit under consideration is to be powered by four 18650 li-ion cells in series. These cells are in a holder and user replaceable so there is risk of the contacts being touched and adding esd ...
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Can "fried" semiconductor devices recover themselves over time?

When this whole "smart soldering iron" craze was just getting started, I jumped on the bandwagon and got myself the very first revision TS100. What I also got then is the complete inability ...
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Ferrite bead value for a LIN bus protection circuit

What is the proper value for FB1 in relation to the surrounding capacitors in this diagram? The FB1 resistance is measured to 0.76ohm and package size is 0603. All components are AEC-Q200 rated. The ...
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PCB Design guidelines for "hot swapping"

I am designing a PCB with JST EH connectors, which are connected to a multi pin socket exposed to the user. The multi pin socket provides +24V, CAN H, CAN L and GND. I have experienced that the PCB ...
eidetech's user avatar
1 vote
1 answer
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Auxiliary mechanical anti-ESD measures

If a PCBA within a plastic enclosure is prone to malfunctioning due to ESD air discharge in proximity of enclosure seams and openings, but changing the hardware or plastic design is not an option, ...
NoobPointerException's user avatar
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1 answer
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ESD protection: connect wrist strap to ESD mat or directly to grounding point

For our workshop, I'm thinking about buying a big ESD mat to cover the whole workbench (5.5 m), so it won't be a "ready to use" one, but a roll to cut to the right dimensions, and to which I ...
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What (semi-) permanent infrastructure be added to ESD harden an already-constructed space?

I have a newly-constructed university center which I would like to harden to ESD. Unfortunately, I became involved in the process too late to ensure that proper antistatic flooring was installed. At ...
Kenn Sebesta's user avatar
6 votes
4 answers
1k views

How can you protect exposed ground pins from ESD?

If I have a DC powered PCB that is floating (not tied to earth ground), and a human touches the ground plane causing an ESD event to occur, what can be done in terms of design to prevent damage to the ...
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Absolute Maximum ratings of a device

In most of the devices I have seen so far, the absolute maximum ratings of the pins of the IC are given with respect to voltage. For example, the maximum voltage applicable on a pin would be something ...
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Plastic enclosure, ESD considerations

I am working on a product with three plastic components: an injection molded enclosure (Lexan, polycarbonate), a 3D printed mounting tray (ESD PETG, carbon nanotubes) onto which my PCB is mounted, and ...
Jay's user avatar
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Can someone explain USB ESD-protection on Nucleo 144?

On the STM32 Nucleo-144 eval board, there are 3 different ESD protection devices for the USB port: U19 = USBLC6-2SC6 U21 = ESDA7P60-1U1M U22 = ESDALC6V1-1U2 Source: https://www.st.com/en/evaluation-...
Oliver Richter's user avatar
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Does ESD protection cause voltage leakage?

I have a this schematic for powering ESP32 over the usb and communicate PC with usb interface. It works perfect. But there is a interesting error. while I am powering ESP32 with Lipo battery (In case ...
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Alternatives for routing two pinouts to the same RJ12

I’m working on a project that is basically UART, power and a couple of I/Os over a RJ12 connector. I want to be able to interact with two different devices that have the same interface but with ...
evading's user avatar
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2 answers
103 views

Correct way of optical input EMC protection

I tried to find an answer online, but didn't find anything that would make my doubt go away. The thing is: when you want to protect any input, that is referenced to ground, you use ground-referenced ...
Maks's user avatar
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1 answer
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Is a 3D printed motherboard case ESD safe enough?

I am developing and 3D printing a case for the development boards (PYNQ) we use at our university. However, I have read online that PLA is quite bad for ESD protection. I found products for anti-ESD ...
SP4CEBAR's user avatar
5 votes
3 answers
2k views

Unidirectional or Bi-directional TVS diodes - Which one to use?

I would like to understand in which places one should be using a unidirectional TVS diode and a bi-directional TVS diode. In the USB power line, VBUS (5V), is it enough to place an unidirectional TVS ...
Freshman's user avatar
2 votes
0 answers
65 views

Ethernet PHY ESD protection, difference in components

I'm using a Würth Elektronik 7498210220A jack (datasheet) and I need to add ESD protection to TD and RD lines of this Ethernet connector (with integrated magnetics). Application of this Ethernet ...
Singed's user avatar
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6 votes
3 answers
652 views

Why use a steering diode with a TVS for ESD protection?

Take this SR05 for example. The data sheet explains that you can use it with or without a reference voltage at pin 4. So why have the steering diodes at all for ESD protection? Is it to ensure that ...
BobaJFET's user avatar
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USB ESD Protection with the NUF2042XV6T1G IC

I have been trying to figure out how exactly I should connect the NUF2042XV6T1G IC to my USB data lines. From what I understand, usually a reverse biased transile diode is connected between the data ...
Kitsuinox's user avatar
2 votes
1 answer
227 views

USB Port Design with ESD/Overcurrent Protection

I am working on a small project in which I use a CH340 to communicate with an MCU, but during prototyping I probably should have a way to protect the controlling computer's USB port from shorts. I ...
Kitsuinox's user avatar
4 votes
3 answers
144 views

Separate ESD traces/layer?

I am designing a keyboard that connects through USB-C to a computer and has Aluminum chassis. I am dealing with ESD protection for the enclosure itself and some exposed components (that have a "...
Marek's user avatar
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Question of Ethernet PoE and TVS protection [duplicate]

My question is based on this question over here Asking this question here since I didn't receive a clear answer that clarified my confusions on TVS for PoE applications. As far as I understand, the ...
Freshman's user avatar
1 vote
1 answer
127 views

USBLC6-2P6 - does the direction matter?

I'm designing a simple PCB with STM32F4 MCU and USB, and I want to use USBLC6-2P6 for ESD protection. However, using the EDS protection device as presented in the datasheet creates the need for me to ...
user747644's user avatar
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Does this circuit have a good enough ESD protection to protect I2C line or do I need a series resistor?

I want to be able to run a wire to an I2C device as far as posible for learning purposes, but I also want to know how to protect the I2C line from ESD events to exceed level 4 of IEC 61000-4-2. I am ...
Merijn's user avatar
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1 answer
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I'm making a development board for ESP32 S2 board, I want to achieve IEC61000-4-2 (level 4) ESD protection on the connectors

I am using a 4 channel TVS(diode) array that has a max clamping voltage of 12V. I have a voltage devidor to translate 5V to 2.5V. So I asume that max clamped input is 6V if an ESD event occurs. I read ...
Merijn's user avatar
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5 votes
1 answer
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How should I select appropriate capacitors to ensure compliance with IEC/EN 61000-4-2:2009 and IEC/EN 61000-4-5:2014 standards for my device?

When applying the IEC/EN 61000-4-2:2009 and IEC/EN 61000-4-5:2014 standards for our device, our consulting firm recommended bypassing the input power jack to the chassis ground using two 33nF ...
Sepehr's user avatar
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1 vote
1 answer
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Why clamping voltage is not given for some ESD diodes

I was comaparing two ESD diodes.Their P/N's are PESD5V0S1BL,315 and PESD5V0U1BL,315. If you check the datasheet of both parts you can see that clamping voltage is specified for PESD5V0S1BL,315 and ...
Hari's user avatar
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Weird pinout of USB ESD protection

The USB ESD protection component USBLC6-2SC6 seems to be very popular (?). However, its pinout seems not ideal: The USB differential pair should be routed close to each other, but the pinout of ...
root's user avatar
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2 votes
0 answers
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Overvoltage Clamping protection for Boost Converter

I think my circuit is failing because of ESD and/or transients when initially connecting my device to a supply. How should I go about protecting the gate of M1? What's the best way to clamp the ...
Zachary Anderson's user avatar
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0 answers
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Problems with USB port and Littlefuse ESD protection on ESP32 and Mac

I needs some help for select/wiring USB 2.0 port, which is for ESD protection. should mention that I'm not that much experience with ESD before, so google it and finally choose littlefuse lineup. As ...
icq4ever's user avatar
1 vote
0 answers
130 views

What will happen if I choose a higher value capacitor for ESD protection than the recommended value?

I want to protect my circuit from ESD, for which I have chosen a capacitor as ESD protection due to size and cost. I have chosen a KEMET 1000 pF 16V with 25 kV breakdown voltage capacitor value ...
Mihir Salaskar's user avatar
1 vote
2 answers
84 views

Selection of ESD diodes

My objective is to protect the pins of a device. The pins are connected to an external connector which might be exposed to an ESD event. Hence, I need to place an ESD protection device on that line. ...
Freshman's user avatar
2 votes
0 answers
180 views

Suggestion for ESD Chassis Ground for Battery-Operated Device with Plastic Enclosure

We are developing a wearable device that is battery powered which is enclosed with a plastic enclosure. As a requirement for safety, we submitted the device for EMC testing, which includes Indirect ...
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