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Beyond Smocks & Straps: Auditing ESD Protection

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Eldredge
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Supply Network Guru
Re: audit
Eldredge   4/24/2014 8:41:35 PM
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@Michael - Will you be writing an article to describe the various ESD ratings for components? I would be interested in that information.

Michael Allen
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Re: audit
Michael Allen   4/24/2014 6:37:58 PM
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In this article we're describing auditing the ESD protection measures: to make sure they're not only "in place" but being  used. Reviewing stats for defects at final test is part of the manufacturing process, and sometimes a spike in a particular defect can point you to a gap in ESD protection, but it's really not as simple as keeping a chart of "defects due to ESD." Many times the defect will not show up in final tests, but will cause a product to fail later on. Auditing your ESD protection to make sure you're doing it right definitely contributes to overall lower defect rates and also lower rate of warranty returns, so you can look for some correlation there. 

Michael Allen
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re:
Michael Allen   4/24/2014 6:36:41 PM
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Yes, some components are more susceptible than others.  Most IC's today are CMOS based and they can be quite ESD sensitive.  Partly because they tend to be large and physically more likely to make a contac of the unfriendly kind.  But in reality there are parts that are much more sensitive like small signal transistors and MOSFET's. Once a board is powered up the ESD voltage required to take out parts can be much lower, and there are more nets to develop voltages across.  Putting parts on the board does not guarantee much in terms of ESD protection.

FLYINGSCOT
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Supply Network Guru
audit
FLYINGSCOT   4/24/2014 8:44:05 AM
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The article was very interesting and thorough.  As well as auditing the process of handling etc. does the audit also review stats for defects at final test before shipping or is the audit only checking that the correct preventitive measures are in place? 

prabhakar_deosthali
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Supply Network Guru
re:
prabhakar_deosthali   4/24/2014 1:47:28 AM
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As per knowledge, the CMOS Ics are more susceptible to ESD.  Other components are not so much susceptible to ESD. 

Is it true?

Also once an IC becomes part of  a citcuit on a circuit board then it is less susceptible to ESD. Is it?

 

Which menas the major care one has to take on the shop floor is while handling the loose Ics before they get inserted into the circuit boards , is it?

HaileyMcK
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Do you do it?
HaileyMcK   4/23/2014 7:30:17 PM
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Dear readers, I'd be interested in knowing if you have this type of audit in place. Let us know. If you do it, what value have you found? If you don't, let us know why not.

t.alex
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Supply Network Guru
ESD protection is very very important
t.alex   4/23/2014 9:57:44 AM
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From my experience, we have some vendor who shipped to us some ICs. However they did not package properly with ESD protection bag and some IC ended up killed during transportation. So, we should not take it for granted.



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