Sometimes we’re lucky and stumble into something like this ESD damage in a Zener diode. The diode was short circuited, but it was micro sectioned in order to determine the die thickness (not something we would normally do on a shorted diode).

zener-eds-1

A damage site was found directly under the ball bond. The damage was determined to be a gold spike (as in ESD) that punched the junction shorting the diode.

zener-eds-2

Check out SEM Lab, Inc.  to learn more.

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