Second breakdown

Second breakdown

The second breakdown is an irreversible failure mode in power semiconductors.

The safe operating area (SOA) of a power transistor is a subset of the parameter combinations of collector emitter voltage and collector current, which the device can sustain without damage. In a double logarithmic diagram the borders of the SOA are straight lines:
# IC = ICmax — current limit
# VCE = VCEmax — voltage limit
# IC VCE = Pmax — dissipation limit, thermal breakdown
# IC VCEα = const — this is the limit given by the second breakdown

The second breakdown is the most complicated failure mechanism, it involves the building of local hotspots.

References

*H. A. Schafft, J. C. French, "Second Breakdown in Transistors", IRE Trans. Electron Devices ED-9, 129-136 (1962). [http://nvl.nist.gov/pub/nistpubs/sp958-lide/123-125.pdf online]
*Michaël Bairanzade, "Understanding Power Transistors Breakdown Parameters", OnSemi application node AN1628/D [http://www.eetkorea.com/ARTICLES/2004MAY/2004MAY18_AMD_POW_PD_AN02.PDF online]


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