Failure Analysis of PWBs

Printed Wiring Boards (PWBs)

SEM images of failures in printed wiring boards (PWBs) and defects in the PWB surface finish are shown below.

 

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Other device failure analysis information:


pwbs

Inner layer separation.

Inner layer separation.

Suspect micro-via.

Suspect micro-via.

PWB construction analysis for conductor layer thickness, dielectric thickness, plated copper thickness, layer-to-layer and registration.

Registration problem.

CAF failure planar section.

CAF failure planar section.

pwb surface finish

Poor HASL finish.

Poor HASL finish.

ENIG 250 uin Ni-8 uin Au..

Sn whisker on flex circuit.

Sn whisker on flex circuit.