An effective method is presented to locate certain failure sites on exposed junction of insulated-gate bipolar transistor (IGBT) devices. High emitter to collector leakage current, hereafter called ICESR, is an IGBT failure mode. The leakage current is typically related to the exposed P+/N+ junction on the die sidewall. Solder die attach residue bridging or silicon damage at this exposed P+/N+ junction are common causes of ICESR leakage. The die attach residue can be dislodged during decapsulation resulting in loss of failure information. A failure analysis flow will be described to precisely locate the ICESR leakage site without disturbing any possible die attach residue.
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Issue Section:Packaging and Assembly Analysis