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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64 views

Antistatic wrist strap without earth - ESD protection when using an inverter

I would like to be able to work off the grid on electronic circuits and I have at my disposal a large 12V battery and inverter (used for lighting in the remote location) which give me the problem of ...
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2answers
48 views

Why use an antistatic solvent dispenser bottle?

What reasons are there to have an antistatic solvent dispenser bottle (for cleaning your PCBs after soldering) as opposed to a solvent dispenser bottle that is not antistatic rated? I am specifically ...
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2answers
64 views

How to properly use ESD protection wristbands

I've looked at other articles on EE stack exchange about ESD precautions. I would like to use a wristband for precaution with microcontrollers. Where am I grounding my wristband to? Do I ground ...
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2answers
36 views

Push-Push SIM card holder ESD protection required?

We are using this SIM card holder in one of our designs. The SIM card can be inserted into the slot and fixed/released by gently pushing it in. So the contacts are protected from touching. Would you ...
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1answer
63 views

Stuck in simulation in LTSpice. ESD Generator

I am trying to simulate an ESD Generator equivalent circuit. My schematic is attached below. I am not getting any voltage. I am guessing there is something I am missing. But cannot think of one. ...
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1answer
63 views

ESD protection on a solenoid driver circuit

I have a breadboard circuit that controls some solenoid valves and am trying to move it to a PCB along with improving it for ESD and EMI. This is the circuit I have on the breadboard that I want to ...
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1answer
123 views

1-Wire DS2480B overvoltage and ESD protection

I'm designing a series of 1-Wire components for my SmartHome Bus and use the DS2480B as Busmaster. Because the cable I run around the house has 3 wires (24V, 1-Wire, GND), I'd like to protect the ...
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1answer
84 views

Clamping Diodes - Any disadvantages form continuously clamp down?

I am looking at using Clamping diodes to protect my Raspberry Pi UART pins from over voltage. The ESD Diodes I am looking at using My question is, is there any harm in them continuously clamping down ...
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1answer
60 views

OK to put board on ESD bag?

I keep PCBA's in an ESD bag. When I want to use them, I put them on the bag to avoid crushing any components on the bottom side. Is this any better or worse than a table?
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1answer
75 views

Portable device shielding & ESD

I'm working on a portable battery-powered device with a shielded I/O connector for sensors, but I'm confused about how to properly ground the shield and ESD array. Here is a block diagram of my ...
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1answer
112 views

TVS Diode selection

I am designing a motor controller for a 24V 2.2KW d.c motor but I have a problem. I have been unable to get the 1.5KE39CA TVS Diode spcified in the design guide i am following. But i have two ...
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48 views

swd debug / programming via usb connector

im looking to use a usb mini connector for both charging and programming / debugging a small circuit. The customer will use the port for charging a lithium battery via 5v. There will be no USB comms, ...
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1answer
71 views

Somewhat broken 74HC00 ic. What happened to it?

I built the following single stepping circuit using a new 74HC00. The inputs for the two unused gates were connected to GND and power decoupled with 0.1uF as close as I could. The circuit appeared ...
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2answers
2k views

Is static electricity really so dangerous? [duplicate]

I'm a beginner in electronics, and in my free time I love making stuff with my Arduino. As I was handling a few Bluetooth modules with my hands, I thought about static electricity discharging on the ...
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1answer
63 views

Use a steel welding table to ground yourself from electrostatic discharge (ESD)?

I have a large steel welding table that I have been using as a work station to solder together my own custom PCBs. I have been using my anti-electrostatic discharge grounding bracelet and connecting ...
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1answer
77 views

ESD Anti static mat Grounding and AC volts

I have an rubber ESD anti static mat on my bench that came without the snaps. I installed 2 snaps, one on each side of the mat. I connected the ground wire from the snap on the mat to the ground in ...
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1answer
175 views

EMI/ESD protection for USB interface?

I'm a student making a simple Arduino-compatible board similar to the Pro Micro and am going to put a USB connector on the board. The schematic in the above link doesn't show any kind of EMI/ESD ...
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1answer
58 views

Will negative ESD strike pose any damages to I/O port connected to TVS?

I understand that bidirectional TVS can withstand both positive and negative ESD strikes, with the positive ESD current is shunted to Ground through TVS whereas negative ESD current is shunted to I/O ...
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1answer
124 views

MCU pull down input push button with interrupt ESD issue

I have an MCU operated at 3 volt with an input pin that is floating by default. I have an external pull down circuit with a 10K resistor connected to the I/O pin. I also have it tied to VCC using a ...
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2answers
83 views

EMC, resistors and trimpots

I trying to get EMC certification and stumbled upon problem. In the above circuit, they will apply ESD to the exposed part of the trim pot, and it permanently changes the value of the trim pot and ...
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1answer
122 views

Bidirectional ESD Diode for 5v Devices

I am working on a custom board for the PCDuino3 Core Computer on Module. The design for the reference board for this has bi-directional ESD diodes on every port that is likely to be touched. I am ...
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2answers
141 views

Why do serpentine traces (supposedly) entail decreased ESD immunity?

In an Intel guideline for their 82579 Gigabit Ethernet controller I've read (p. 18) that a side effect of using serpentine traces on the MDI (which carries the actual Ethernet signals) leads to ...
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1answer
218 views

Simple ESD protection for MOSFETS

I'm designing a MOSFET (FQP30N06L) circuit to drive a (50V, 3.4ohm) pinball solenoid controlled by a PWM pin on an Arduino DUE: simulate this circuit – Schematic created using CircuitLab ...
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4answers
183 views

EEPROM I2C driver hanged during ESD test?

In our prototype , we have a I2C based EEPROM . During ESD Test(High potential spark is injected into system for a very short moment), the drivers hangs in the I2C code. Basically there are while ...
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0answers
97 views

EMI & ESD protection for 3.3V signal

I am looking into options to protect the outgoing signals against ESD events and EMI issues. The device will be battery powered but GPS and radio modem are likely to be operated close-by. Frequent ...
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0answers
67 views

Placement of ESD protection device on Motherboard and mating daughter PCB for PCB lines in plastic enclosure

I have a motherboard with a USB Hub IC. The USB lines are routed from the motherboard via a connector to a daughter board. This daughter board has the USB connector. The cards are inside a plastic ...
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2answers
1k views

How does a diode clamping circuit protect against overvoltage and ESD?

I always see this circuit when talking about overvoltage or ESD protection (does this circuit accomplish both, or just one?): However, I don't understand how it works. Say I put in 20V at Vpin. So ...
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1answer
93 views

What external factor could cause increased current draw?

I have a metal cased device powered by 2x 1.5v AA batteries with a standby current draw of 19.7 microAmps. If I then cause a build up of static by shuffling across a synthetic floor and touch the ...
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3answers
142 views

ESD protection for pH measurement electrode input

I want to puild a pH meter, which uses a normal glass electrode. Such an electrode behaves as a pH dependend voltage source (<+-500mV) with very high internal resistance (10MOhm - 1GOhm, depending ...
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3answers
379 views

Child-Safe setup for ESD protection environment on desk

I need to setup an anti-static workbench in my spare office, and kids sometimes get into it ever since they learned how to pick the locks. My intended approach is to: Lay out an ESD mat on the ...
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2answers
2k views

How do I use an antistatic wrist strap and mat

I will be building my very own PC soon and I brought both the Rosewill RTK 002 Anti Static Wrist Strap and Rosewill RTK-ASM Anti-Static Mat. As far as I know both the anti static mat and the wrist ...
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2answers
239 views

What methods are used to protect floating devices against ESD

In conventional circuits you'd like to divert your strike to ground and through a path that diverts the current safely to a grounded chassis or output. That is not possible in hand held devices for ...
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1answer
101 views

Preventing Reset during ESD

I would like to design a RC filter to prevent reset to a SoC during a ESD strike. Assuming the reset net is by default low. And the reset comes from a separate board which connects to the main board ...
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541 views

How to fix RaspberryPi HDMI-DDC/CEC issue while keeping ESD protection?

The RaspberryPi (Type B, all revisions before B+) shows a more or less well known issue with the CEC/DDC of connected HDMI devices. When powered down CEC between the connected TV set and other devices ...
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0answers
141 views

ATmega 1284P lockup or stuck in reset after lightening storm, then fully recovers. How to prevent it?

I have a custom Arduino based data collection system which has been running happily, reporting data over a cellular connection on solar power for a few months. After a lightening storm it stopped ...
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2answers
105 views

What components can be damaged through 10KV ESD?

I'm designing a circuit which has Voltage regulator(IC), current source(IC), resistor, capacitors, LED, reed switch and capacitor. It has to survive 10KV ESD event. My question is: 1) What components ...
2
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1answer
297 views

Best practice for Lightning/Surge Protection on PCB

What is best practice/recommendation when I want to protect against lighting/surge? More specfically, my application requires passing the following test: "ANSI/IEEE C62.41---1.2/50 microsecond ...
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2answers
651 views

5v tolerance on 3.3v PIC

Many PIC microcontrollers such as PIC24EP512GU810 have 5V tolerant pins. My question is how does this work. Do these devices have clamping diodes for ESD protection? Would clamping the input voltage ...
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0answers
97 views

Certifications and ESD

I am designing a board (an eval board). We intend to go for certifications (CE and FCC). I have very small awareness of such things. Of concern to me is ESD among other things. I know that I will need ...
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3answers
318 views

Setting up a non-ESD area in a lab

this question is regarding standards and/or best practice guidelines for ESD control in a professional lab environment. We are currently tightening up our (admittedly too lax) ESD control in the ...
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1answer
173 views

Do I *need* a TVS Diode at the USB connector?

I've got a typical electronic trinket that will be connected to laptops and wall warts to recharge. Fairly cost-sensitive. Will a spark completely destroy the MCU with a USB peripheral? Is there a ...
3
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1answer
125 views

Simple ESD mat and wrist wrap setup

I have a hard time finding a how-to. I would like to set up a simple ESD mat and wrist wrap, but I am not sure about is the the 1 MOhm resistor should be, if at all. Several options: 1 MOhm from ...
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0answers
106 views

ESD protection for sensitive electronics

I've developed an electronics system that is comprised of box (power supply, board w/ FPGA etc) and a separate accessory unit that connects to the box via a 6 conductor cable. The conductors in the ...
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3answers
220 views

Oscilloscope gear and ESD

The answer might be obvious, but I am curious, how well are oscilloscopes and probes usually protected against ESD? I noticed that oscilloscope probes are usually shipped in esd-protected bags. On ...
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1answer
94 views

Did ESD fry my REF200 current source circuit?

Last summer I built a current source to power a custom-made pressure sensor. This source uses a REF200 IC and is powered by a wall wart that outputs 5V. The whole circuit is encased in a plastic box ...
9
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2answers
5k views

Anti-static vs. conductive vs. dissipative foam?

UPDATE: I have included some basic answers inline that I received after talking in depth with an application engineer at a foam company. I think it would still really help for someone to help flush ...
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1answer
345 views

DIODE as capacitor?

How does Diode act like a capacitor when voltage across diode is less than forward voltage spec. Basically when diode is turned off? What is its usual capacitance when diode (zener) is turned off.
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1answer
493 views

Optocoupler TVS Protection for digital input module 24V 220V

I have two digital input modules that must match: IEC 61000-4-2 ESD Contact 6kV and Air 8kV IEC 61000-4-4 EFT 1kV IEC 61000-4-5 Surge Line to line 0.5kV and Line to Earth 1kV First module: 32 digital ...
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1answer
127 views

CAN bus ESD protection

For a CAN bus application, is it correct to connect an ESD protection IC to GND, or chasis of the device?
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105 views

Is ESD mat toxic? [closed]

I bought a 3-layer vinyl ESD mat for my lab and OMG this thing smells so bad. After several hours I can't even enter the room. Is it toxic? What do you do with your mat?