All Questions
Tagged with esd surge-protection
26
questions
5
votes
1
answer
217
views
Metal chassis grounding with wall wart supply, ESD test failed
We're building a device which takes its input power from a 12VDC wall wart PSU, and has a metal chassis. We just passed preliminary EMC/EMI test, but in the ESD test an 8kV jolt to the chassis killed ...
- 1,259
0
votes
1
answer
159
views
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 ...
13
votes
4
answers
4k
views
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 ...
- 4,683
2
votes
1
answer
143
views
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 ...
- 4,683
1
vote
1
answer
72
views
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 ...
- 2,593
3
votes
2
answers
1k
views
Difference between Surge, ESD and EFT
I was going through this ESD Presentation where I noticed the below image:
I'm trying to understand the different types of overvoltage and they have given the classification above.
In this, what I ...
user220456
0
votes
1
answer
171
views
Protecting Circuit - ESD
I'd like to know on how to select the transient protection circuit components for my Ethernet Interface.
I saw a reference design that uses a pair of UCLAMP3301D and 2.2Ω series resistors to the jack ...
user220456
1
vote
1
answer
89
views
Could ground faults in the same building affect my anti-static grounding plug?
I have some tools for anti-static purposes for repairing a computer: an anti-static wrist strap, an anti-static mat, a grounding plug on which only the earth pin is metal (the hot and neutral are ...
- 177
0
votes
0
answers
437
views
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 ...
- 1
0
votes
0
answers
154
views
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 ...
- 109
11
votes
2
answers
6k
views
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?
- 543
0
votes
1
answer
609
views
ESD protection for power input with several fused branches
I'm designing an industrial board that will be powered with a +24V DC. On the PCB there are several fuses to protect each branch against over-current/short-circuit. Example:
simulate this circuit &...
- 1,235
0
votes
1
answer
253
views
How to choose TVS/ ESD for sensitive application?
I am using ad8232 ECG with 3 electrode configuration,
Edited
ad8232 used schematic
I need to protect circuit from any voltage more than 5V, since ecg measure only around 300mV with common mode signals....
- 194
2
votes
1
answer
2k
views
TVS diode for RS485
I'm studying the ISO1500 for an RS485 application. In particular, I'm looking for a TVS diode for bus protection. I've found that a common TVS diode used for RS-485 applications is the SM712 (like ...
- 45
0
votes
2
answers
534
views
How is this PMOS FET working as ESD protection?
Can somebody please explain the circuit functionality? I'm thinking of PMOS (\$V_{sg}=0\$) as a current-limiting diode. Am I right?
- 1