All Questions
20
questions
1
vote
0
answers
144
views
What will happen if I choose a higher value capacitor for ESD protection than the recommended value?
I want to protect my circuit from ESD, for which I have chosen a capacitor as ESD protection due to size and cost.
I have chosen a KEMET 1000 pF 16V with 25 kV breakdown voltage capacitor value ...
0
votes
1
answer
51
views
ESD models - CDM and MM
I am just trying to understand the differences between the ESD models in this article.
The CDM and MM models are very similar. Is the MM model the reverse of CDM model.
I have this confusion as CDM ...
user220456
0
votes
1
answer
85
views
Question on the USB connector shileding
I have a USB microphone, based on cm6533 chip, that appears to be in working condition, with the exception of it's fried USB type C connector. Upon closer inspection this is the circuit that houses ...
- 27
2
votes
0
answers
81
views
Connecting digital ground and chassis ground
I have an Ethernet connector whose chassis or shield ground I need to connect to the digital ground. I read that it is a practice that is followed in many designs.
My questions:
Why should they be ...
user220456
1
vote
1
answer
99
views
Simulate ground or prevent charge build-up with a capacitor installed on a lead frame?
My company is singulating a lead frame populated with ESD sensitive ICs and many are failing due to ESD damage. The singulation process requires tape that prevents proper grounding, so a charge builds ...
0
votes
2
answers
612
views
MOSFET drain–source protection using a ceramic capacitor
Answer to this question says that the voltage across a capacitor on an ESD event (see the link for used values) would be 8 V. Can I use it to protect MOSFET drain pin that could be touched during ...
- 248
0
votes
1
answer
99
views
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 ...
- 25
8
votes
3
answers
2k
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 "...
-2
votes
1
answer
79
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.
...
- 25
2
votes
2
answers
2k
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 ...
- 123
0
votes
3
answers
108
views
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 ...
- 163
0
votes
0
answers
175
views
How to check for the ESD protection of the capacitors
I have this circuit
I need to check whether my input capacitors C0001-c0004 are protected for ESD events.
My ESD pulse spec: +/-8kV, 2kohms & 330pF. I have taken 130% of this +8kV as my ESD pulse ...
user220456
3
votes
2
answers
583
views
Do capacitors provide ESD protection even if they are already charged?
I've read about ESD protection with capacitors and it seems that if one knows its limitations it could in some cases be a cheap alternative for or addition to designated ESD protection circuits.
The ...
2
votes
0
answers
786
views
ESD Capacitor Calculation, 330Ohm Series Resistor and ESD Clamp Voltage
I have a input power filter circuit.
It has ESD Protection capacitors which help to protect the downstream circuit from ESD Pulses.
ESD Capacitors Specifications :
C0001, C0002, C0003, C0004 = 47nF, ...
user220456
1
vote
2
answers
260
views
What is the maximum voltage that the circuit can withstand
Below is my circuit,
ESD Capacitors Specifications :
C0001, C0002, C0003, C0004 = 47nF, 100V, 10%, 0805
I have 2 basic questions :
When a +4kV pulse & 330pF is applied, Does the 12.77V (Q=CV ; ...
user220456