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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56 views

Maximum forward current on ESD diodes

I'm interfacing a dsPIC33EP512MC806 with a set of analog systems. The analog systems manage a battery and have vregs for the digital systems. The analog systems measure the voltage and current ...
7
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3answers
190 views

How to Connect USB/Ethernet Shields to Chassis or Digital Grounds

I have a PCB with a few USB and RJ-45 Ethernet connectors on one side. I'm quite confused as to how exactly I'm supposed to be hooking up the SHIELD pins on them though. This is for a host device ...
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3answers
104 views

MCU strange failure

I am using a STM32F4 chip to build a control device product. We received a report from our customer that our device does not work properly after having been work half an hour. Even reset does not ...
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2answers
66 views

Bulletproof ESD Powersupply Inputs

I have a power amp that is essentially functions like a benchtop supply, and you can connect banana plugs into it. I would like to protect it against ESD, but also protect the amplifier. People in our ...
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3answers
84 views

ESD wrist wrap resistance

I use a wrist strap with 1 MOhm resistance connected to a ground Plug Adapter with 1.5 MOhm, so total series resistance is 2.5 MOhm. Is it OK for ESD protection or would it be better to connect the ...
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2answers
91 views

UART signal quality and ESD protection

Our circuit has its UART port connecting with a central control board. And I am thinking on the ESD issues. The UART runs at 56700 baud rate. The UART communication is between two stm32f407 chips. ...
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2answers
48 views

Protection of a 1.2V bus

I typically put a TVS diode on all of my power rails as standard practice to protect against ESD events. I'm using an FPGA in a design for the first time and I'm finding that I can't get a TVS with a ...
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1answer
29 views

TVS diode electrical parameters

I am using below diode in my design to protect 3V3 lines:- http://www.ibselectronics.com/ibsstore/datasheet/AZ5123-01F_Datasheet.pdf On page 2 they have given :- Also, they have given on same ...
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0answers
32 views

How to check the grounding of rack shelf for ESD

Can anyone suggest how to check the grounding of the Metal Rack Shelf for Discharging Static Electricity? I have an Earth tester with three terminals. Is it possible to conduct the test by using ...
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1answer
42 views

Protect exposed metallic components from ESD

I suppose that a PCB covered into a plastic case it's protected from directly touching it and from possible ESD damage from direct contact. But there is some exposed PCB components like USB connector ...
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4answers
301 views

ESD protection for OpAmp inputs and outputs

The following circuit is a preamplifier that we are currently using. In real practice, we do not have the photodiode connecting with OpAmp directly on board. Instead, the photodiode is connected with ...
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1answer
43 views

Diode protection in Pins

I was using the ISL21090 voltage reference from intersil. Intersil Link. Now, there are quite a few DNC pins in this package which could be an issue during ESD . Thats when I cam across a kind of ...
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1answer
50 views

Difference between Bidirectional TVS diode symbols

I am intending to use this CDSOT23-T05C Bidirectional TVS diode in my design to protect two separate data lines, however the symbols in the datasheet are contradicting conventional rules. This is how ...
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1answer
55 views

ESD sensitivity of MOSFET pins

Recently I ordered some tiny SMD MOSFETs (AO3400) I never paid any attention to ESD. After soldering several MOSFETs on SMD to DIP conversion boards for prototyping I noticed they didn't function ...
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1answer
78 views

Power line protection: overvoltage, ESD, voltage polarity

We are designing an industrial control board. The input voltage of the board is +12V, ground and -12V. Our previous design does not include any power protection and now I want to add over voltage and ...
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1answer
40 views

ESD tests: when device is powered and not

I have some questions on ESD tests performed when device connected with power and not and searching for help here. I am asking this question because I think ESD can go into the power through TVS ...
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2answers
81 views

Why we do not need wrist bands for ESD protection when using an iphone?

When using high performance oscilloscopes, it is recommended to always operate with a wrist band connecting with ground through 1MOhm. So my understanding for that is the oscilloscopes are designed ...
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1answer
60 views

ESD protection for work with CPU/GPU

I am ready to perform a BGA reballing operation on my ps3's CPU and GPU chips. Should i take into consideration electrostatic discharge or is it not needed? How can i protect from these dangers? Are ...
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1answer
52 views

What could cause a buck controller to regulate to half its set point?

I have had two buck converters (from different vendors) fail in very similar ways. The first was blamed on electrical over-stress (i.e. too high of a voltage was applied to a logic-level pin) - the ...
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0answers
39 views

Latch-up and ESD protection for power supply and RS-422

I am designing a power supply board that has a switching regulator and four LDOs. Now, I understand that layout details or practices will help reduce switching noise from corrupting the ground and so ...
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1answer
70 views

Defence from electrostatic discharges

I work with SLED (superluminiscent light-emitting diodes). Datasheet said me that I must to avoid electrostatic discharges when I work with SLED. So I want to connect cathode with anode of SLED and ...
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0answers
53 views

ESD - SMA connector

Suppose I have PCB in metal chassis with 2 SMA connectors mounted on it. Let's say they are used for GSM and GPS. How to protect against ESD and successfully pas FCC/CE? I couldn't find any TVS ...
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1answer
67 views

How to design ESD and EMI -safe circuits? [closed]

First of all, sorry if this question is too low level or stupid, but I really wonder how to design ESD and EMI(electromagnetic interference) -safe circuits. I have read the user manual of my FPGA ...
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1answer
60 views

How do you choose whether to use a TVS, clamp the signal, or both?

When you are trying to protect a single-ended signal, how do you choose whether to use a TVS, clamp the signal to the rails, or clamp the signal and put a TVS on the rail? Using a TVS can help ...
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1answer
55 views

ESD protection on small signal inputs

Looking for general advice on ESD protection on board inputs that are carrying small signals, for example, tens of millivolts at very low current. I suspect that hanging diodes off it might compromise ...
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2answers
92 views

Could an electrically charged person damage an ESD sensitive component, that is isolated from ground, by touching it?

Forgive if it is a silly question, but I couldn't find any answers to this online. I find it hard to understand some ESD related issues. I believe that, typically, Electrostatic Discharges occur when ...
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1answer
115 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
83 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
77 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
66 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
169 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
130 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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2answers
580 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
116 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
77 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
170 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
158 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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1answer
100 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
3k 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 ...
0
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1answer
84 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
122 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 ...
5
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1answer
409 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 ...
2
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1answer
95 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
181 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
102 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 ...
2
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1answer
161 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
171 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
352 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
260 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 ...
2
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2answers
3k 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 ...