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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78 views

GPIO esd protection

I came across NXP app note highlighting esd protection for GPIO pins. I found two different schemes for digital IO and I2C as given below: As far as I know, I2C pins are same as Uni-directional ...
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1answer
29 views

Protecting Test Equipment During an ESD Test

I am planning to run an ESD test on a product running traffic to some test equipment over gigabit ethernet and some other signaling interfaces (RS-232, USB, etc.) How do I decouple the ESD spikes from ...
0
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1answer
37 views

Normal Operation Current for ESD Diode [closed]

I want to use a ESD Diode against Vehicle Battery which is rated @ 36V max. I have selected below Diode :- http://www.nxp.com/documents/data_sheet/PESD36VS1UL.pdf Now, I am okay with working voltage ...
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0answers
23 views

How to test plastic for ESD properties?

I'd like to make myself a cheap soldering / inspection station by taking an acetal plastic slab and mounting a linear rail to it for attaching a USB microscope. However, I want to first ensure that ...
5
votes
1answer
95 views

Possible wrong use of TVS diodes?

I've been facing a weird situation and unable to find the reason behind so far, therefore I frustratedly turned up for help. I have a system comprised of 2 separated PCBs (A control box and an ...
0
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2answers
94 views

Does ESD pass through capacitors?

Do ESD discharges pass through capacitors? My circuit is shown below. Basically i'm concerned that if there is a DC component to ESD that ESD Sensitive IC 2 may not be protected by the ESD diode. The ...
0
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1answer
64 views

Liquid Tape for protecting exposed electronic components

I recently found the liquid tape LTB-400 made by Garnder Bender and was wondering if it's Ok to use it to cover IC chips for ESD protection? The circuit board is not placed in a housing, it's sold as ...
0
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1answer
50 views

Transient Voltage Protection of an automotive circuit

Im an electronics engineer student, and im doing a project where im designing a circuit which will be used in automotive applications. More specific it contains a PIC controller which has 16 ...
0
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1answer
180 views

Where does the spark come from? (an embedded system circuit)

We are developing an embedded system product. As an inexperienced engineer, I am really scratching my head to make our product reliable: temperature, ESD and etc.. The following diagram shows my ...
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3answers
407 views

How to protect Reset pin of MCU from ESD strikes?

We have been designing ESD protection circuits for MCU exposed pins. Here comes the reset pin protection: The pin is connected with a ESD suppressor at the connector. The pin is connected in serial ...
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2answers
125 views

How do I store and transport microcontroller boards safely?

I'm looking for a carrying case for my various electronics components, mostly various microcontroller boards (Arduino, Teensy, etc). I've seen a lot of people use plastic tool boxes, sometimes with ...
3
votes
1answer
61 views

Where to put a spark gap for ESD protection--to an isolated “GND” or to protective earth?

I am designing some PCBs for a system that runs on a fully-isolated DC power supply. I have three power inputs: Protective earth (connected directly to the line earth of a three-pin US 120V AC power ...
3
votes
3answers
79 views

How to determine whether I need ESD protection? (MOSFET H-Bridge)

I am designing a H-Bridge using IRLZ44N MOSFETs, IR2104 driver ICs and UF5401 diodes. The current circuit looks like this: It will be used on a battery powered device, so no real grounding ...
2
votes
1answer
100 views

Selecting a TVS for ESD protection

I'm working on a design that is susceptible to ESD. The product is handheld and powered by a 5V wall-wart via a barrel jack connector. The 5V supplies a few ICs with power. Additionally there are a ...
0
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2answers
28 views

Question about Static charges & dissipation

I have been practicing ESD safety procedures in my workplace. We typically use grounded ESD Wrist Straps and ESD mats. If I correctly understand the static charges stay put until they come in contact ...
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1answer
31 views

Designing an anti-static enclosure for sensitive electronics

I was a little disappointed to discover that I managed to fry a brand new Raspberry Pi camera module. After testing on multiple hardware and triple checking all the connectors, I was forced to ...
3
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2answers
139 views

Are all pink bags anti static?

I was shipped a USB dongle in a small pink baggie. If it's an anti-static bag I would love to re-use it. How sure can I be that it is, and is there a way to test it?
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2answers
198 views

DIY ESD generator (ESD-gun)

Does anyone have a simple ESD generator circuit for pre-compliance testing (3KV-20KV)? e.g. can it be built from the following? ...
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3answers
75 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 ...
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3answers
375 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 ...
0
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3answers
122 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 ...
0
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2answers
119 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 ...
4
votes
3answers
111 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
141 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
63 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
42 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
64 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 ...
0
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1answer
48 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 ...
5
votes
4answers
455 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
49 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
92 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 ...
1
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1answer
77 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 ...
4
votes
1answer
139 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
66 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
111 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 ...
0
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1answer
70 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 ...
2
votes
1answer
56 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
54 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 ...
0
votes
1answer
73 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
74 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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votes
1answer
87 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 ...
1
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1answer
72 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 ...
0
votes
1answer
72 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 ...
2
votes
2answers
107 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 ...
2
votes
1answer
141 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 ...
0
votes
2answers
107 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
90 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
78 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 ...
0
votes
1answer
242 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
169 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 ...