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Question Are closed products containing electronic assemblies susceptible to damage from ESD when all external connectors are covered with protective caps? Do they need to be handled with a wrist strap at this point? Could you reference an industry specification that addresses this issue? Thank you for your help.
Answer

An electronic device ESD sensitivity or susceptibility is determined by testing using ESD simulators to determine its Withstand Voltage classification. So ideally the closed product should be tested.

Many companies assume that the enclosed product is not ESD sensitive. This is likely often correct, but there are some concerns.

The electronic components are controlled by the use of electrical signals. This signal can be overridden with an ESD event following the same electrical path (power rails, Input/Output traces/pins/cables/etc.).

As an ESDS component goes through the manufacturing cycle, it does not become less sensitive. However, the probability that an ESD event will strike the ESDS item may decrease.

 
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