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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Type of tray to use to bake integrated circuits in DIY reflow oven

I just recently started getting into surface mount components with a Controleo3 reflow oven. I usually buy extra components for projects I build, and end up with extra integrated circuits that have ...
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Adafruit LCD Going blank when using static gun

I'm having a problem with an Adafruit touch screen Module. When I use a spark gun (set to 20kV) on a grounded metal plate (placed a meter away from the DUT) after a few tries, the screen goes blank. ...
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Sustainable packaging for electronics and PCBs [closed]

As an electronics engineer, I design and have lots of PCBs contract manufactured. Every supplier I have ever used will always use packaging materials like PE foam pouches and bubble wrap. Some use the ...
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Is it safe to use a laptop in an ESD safe environment? [closed]

I work in a highly sensitive ESD environment. I have equipment worth tens of thousands of dollars that can be damaged with a single zap. For testing purpose, I need to get my laptop inside this ESD ...
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Wierd noise on GND when I touch a metallic object to it

I am facing a problem. I have a PCB designed which fails ESD tests. The PCB is powered by an external power supply that provides 12V to the system (from 240V AC.) The power supply is CE certified and ...
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Chassis / Shielding Grounding on Mobile Robot

I am working on a project building a mobile robot. I realized that the robot will have a buildup static when it is running because I can feel it when I touch it (uncomfortable spark). The robot is ...
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How to protect measurement equipment channels from ESD?

I was wondering what is the best way to protect measurement equipment, when handling like oscilloscopes/spectrum analyzers/Vnas/sensitive circuits (especially when stored in (none esd) foam)? I was ...
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How can I test if a GPIO pin on a microcontroller has been damaged by ESD?

I need to test if a microcontroller's pins are damaged after hitting it with an ESD gun. The microcontroller I'm testing is the STM32H743. The only method I have come up with so far is to just Toggle ...
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Can an ESD happen between my body and a battery-powered device?

I have a question regarding ESD. My body can be electrically charged, for example if I have walked on carpets. In such a case if I touch the earth pin of one of my household outlets, an ESD will ...
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6 votes
1 answer
258 views

What are the drawbacks of connecting circuit GND and Chassis via multiple mounting screws (for EMC and Safety)?

Although there are various suggestions around for how to connect circuit GND to the earthed chassis (say, the chassis has a point-to-point resistance of around 1 mΩ) in devices, there seem to be two ...
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Is this type of polyethylene mat ESD safe?

I have a few metal keyboards which have a slight risk - if there is too great a charge, it will go through the case and potentially short the PCB inside. Ideally the case is designed well enough to ...
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ESD Wrist Strap When Working on Monitors and Power Supply

My book for the A+ exam specifically says not to use ESD for repairing monitors or power supplies. Why is this? I understand that their capacitors hold lethal amounts of charges, but the motherboard ...
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Protecting MCU digital input with 300m wires

I need to protect the inputs and a 3.3V MCU (ESP32) from damage (eg lightning) and noise with a switch connected at the end of a cable that can be hundreds of meters long. Based on the schematic (Fig ...
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How to protect differential data lines from ESD?

How do you protect a differential signal line (like Ethernet) without a common ground from high voltage or ESD? Do you use TVS-diodes from Tx+ to Tx-? I thought of using TVS-diode arrays due to their ...
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How much current can opamps' integrated ESD diodes carry during an ESD strike?

So the basic answer to such kinds of questions is usually: "If nothing is specified in the datasheet, assume the most conservative rating!" However, the datasheets usually only mention the ...
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When does a PCB require a chassis ground connection?

Do all PCBs require a chassis ground connection point? I am designing a circuit board which will be used in many different types of assemblies. It is a small mixed-signal, low-voltage (24 VDC power, ...
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Grounding for working with electrostatic-sensitive devices

I'm planning one of my first electronics projects beyond basic repair soldering (it's a small pre-amplifier for a contact microphone). So I've got some JFETs and other pieces and would like to put ...
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Electricity to ground

I was working on a games console and accidently got shocked by a capacitor. I was wearing a ESD strap that was connected to the back of my pc which is connected to a powerboard and to a grounded power ...
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8 votes
3 answers
427 views

How to choose capacitor voltage rating for ESD protection?

I understand the basic calculations on capacitors for ESD protection. In a nutshell the higher the capacitance the lower the final voltage will be because the charge of the ESD event will be "...
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3 votes
3 answers
786 views

How to connect antenna to oscilloscope?

I have zero experience with antennas and little experience with electronics. I need to detect weak radio signals in the range ~100MHz - 1.3GHz and analyze them with an oscilloscope. I bought a large, ...
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1 vote
1 answer
83 views

Is it OK to route under small mosfet transistor?

I have a 2-layer board where I am thinking of routing TX and RX to microcontroller under a small P-channel mosfet. I know some parts can be considered sensitive and one should not route under them. Is ...
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Can common mode VCC/GND transients cause false clocking in a D flip-flop? [closed]

I have a low complexity board with a sn74lvc1g175 D flip-flop that occasionally gets clocked by nearby discharges with an ESD testing gun. These are not discharges into the actual circuit, just ...
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How to measure the waveform of a piezo igniter?

Is there a (cheap) way to measure the pulse of commercially available piezoelectric igniters like those used in lighters or BBQ grills? I use them as a cheap (and very crude, for sure) method for ESD ...
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1 vote
1 answer
83 views

ESD and overvoltage protection with varying clamping voltage

I am designing a PCB for analog multiplexing. I want to protect the signal lines against ESD and overvoltage. The voltage in the signal lines shouldn't exceed the limits of the two supply voltage ...
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What breakdown voltage of TVS diode should I choose for circuits interfacing with vehicle 12V battery?

I want to add ESD protection on my circuits that interface with vehicle 12V. My understanding is vehicle battery can reach up to 15V. Looking at , I can either pick 14.2V or 25V for min Vbr. I ...
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3 answers
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Are Nylon screws safe as PCB mounts, on PCB having a very ESD sensitive device?

I am using Nylon plastic screws as PCB mounts on my 2 layer PCB. The PCB has a very ESD sensitive and expensive device mounted on. Since the Nylon material can develop positive static charge, is it a ...
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How to best protect 12V from voltage transient spikes?

I am building an AC power supply and I decided to put digital current and voltage panel meters into it. I have an issue where whenever my main contactor engages and disengages, there is a transient ...
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Can a static shock to a motherboard damage a hard drive that is connected? [closed]

Hypothetically, could the shock spread through the board and follow the wires and damage a hard drive?
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-2 votes
1 answer
76 views

ESD damage to old system [closed]

I was doing a capacitor check on an old xbox motherboard. I always knew that you could damage a motherboard by touch but at the time either my mindset was off or overconfident in its supposed rarity. ...
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1 vote
1 answer
107 views

Are there robust through-hole MOSFETs for beginners?

I want to create switching circuits of less than 20mA in pos/neg 15V applications. 5 to 10 transistors, combination of N and P. Switching at 2.5kHz. I simulated my circuits and now want to solder them ...
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How to add surge protection and over voltage protection for a smart switch SMPS

I am making a smart switch for toggling appliances with a 10 A relay using esp8266 as my MCU. I am using an isolated 3 W (5 V, 600 mA) SMPS. I have seen in some specifications about 2.5 kV surge ...
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252 views

ESD protection on floating circuit - Capacitor from circuit ground to earth?

I'm not very familiar with proper ESD protection and wondering about the correct implementation of a TVS diode to protect an input of an isolated circuit. In the case of an ESD event into the ...
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Transient and Surge Protection

It seems that when choosing ESD/TVS diodes, MOVS and GDTs that while their clamping voltage is rated in Volts, their protection is rated in Watts or Joules. For example, the LittleFuse SMCJ250CA is ...
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4 votes
3 answers
265 views

Polarity of TVS diode is unclear

I have a question regarding the DESD1LIN2WSQ TVS diode by Diodes Inc. which I want to use to protect some 24V IOs of a microcontroller board. Until now, the TVS diodes I worked with always had the ...
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8 votes
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Difference between ESD and TVS diode?

What is the difference bweteen TVS diode and ESD. Though both of the functions are the same, which do we need to choose for what application?
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Which circuit is better for P-Channel MOSFET ESD and over-voltage protection?

There was damage to some P-channel MOSFETs on the PCB due to ESD and dielectric strength tests during our manufacturing. I think the original circuit design is susceptible to high voltage stress. A ...
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1 answer
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What's the change of resistance after gate high voltage failure?

I have a damaged p-type mosfet. Resistance of drain to gate: almost zero , Drain to source : below 10Mohm(some are xxxkohm). I think ESD is injected into drain. So. I want to know the symptoms(...
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5 votes
1 answer
154 views

Can a ggNMOS be implemented discretely on a PCB?

Reading this answer, I ran across the ggNMOS for ESD protection. https://electronics.stackexchange.com/a/576935/166672 Reading on the web a little, it seems that this is only used inside of an IC, not ...
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IC protection diodes confusion

This question is (loosely) related to my previous question here. I wanted to check the ESD protection diodes of the LPC1114 MCU from NXP. So I measured all pins on a brand new LPC1114 MCU with a ...
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What would happen if I inject the charges (ESD) at PCB many times and PCB is completely floated (isolated) from the earth?

Just I wonder: If I inject the charges (ESD) at PCB many times and PCB is completely floated (isolated) from the earth. Will charges be dissipated or remain? I think charges will be charged in the ...
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3 answers
239 views

Can MOSFET withstand the ESD from drain when a TVS diode is installed between gate and source?

Assume that an N-channel MOSFET is used. A TVS diode is inserted between gate and source. The source is connected to GND. (Not real grounded (not earthed.)) The drain is open and connected to the ...
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32 views

Powered-off input protection using analog switch (ADG4612)

I have a battery powered device that has two analog 0-5V input lines, and two I2C lines (3.3V, 5V tolerant). All of them need to be protected from ESD (8kV contact, 15kV air discharge) and over-...
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Communication Line Protection

I intend to protect a BUS switches ICs, whose voltage on its pins cannot exceed 5.5V and 3.3V. The current cannot exceed 16mA. The circuits needs to opperate from 3.3V to 5V. But automotive ...
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What is 16A TLP in ESD diode and how it determines the clamping voltage of an ESD diode?

Please explain the meaning of 16A TLP in ESD diodes? Is the clamping voltage determined at 16A transient current flowing through diode? Please see the table in the below picture:
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Use of common choke with more than 2 wires

I've been looking around and I couldn't really get a good answer to this question, not even in Henry Ott's book (so far), so here it goes: What is the best approach when there is the need to place a ...
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5 votes
2 answers
397 views

Do AC input optocouplers require an ESD protection?

I intend on using a circuit I designed for detecting an AC input line for control purposes. One of the inputs will be accessed by third party users and a cable might be connected with a decent length(&...
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1 answer
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ESD pins of CM1624

I am considering to design SD interface with a CPU. For ESD and EMI, there are some ICs that can prevent these issues with RLC filter and TVS diodes such as CM1624. What I am wondering about is that ...
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1 vote
3 answers
304 views

When handling a PCB, should I ground myself to earth or something else?

I have been researching electrostatic discharge when it comes to safely handling PCBs, and I'm having trouble understanding how I should ground myself. Many people say to just touch any conductive ...
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USB connector ESD protection vs vias vs impedance

I need to put an ESD protection on USB connection of a 2 layers board. I decided to use a specific component from TI (TPD4S012). The application note suggest to use the following layout: Since I have ...
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4 answers
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Can ESD from a person damage circuitry even though it was not perceivable?

I know that when working with circuits it is important to avoid ESD onto sensitive components. But I am wondering when I inevitably make the mistake of discharging static onto a PCB will I know? ...
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