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Characterization and Analysis of a Power Transistor for Reverse Second Breakdown When Subjected to Neutron Fluence

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1 Author(s)
Scarpulla, J. ; General Electric Company Re-entry Systems Division Philadelphia, PA 19101

It is shown, using extensive experimental data, that the dominant mode of reverse-biased second breakdown (RBSB) in a typical fast-switching radiation hardened power transistor is that of avalanche injection. This is an electronic mechanism rather than a thermal mechanism; therefore, the use of the second breakdown energy parameter, ESB, to characterize the RBSB performance is incorrect. The RBSB characteristics of a large sample of devices were measured over a wide range of conditions in sophisticated test circuits before and after neutron irradiation. The observed behavior is explained using computer models for current pinching and avalanche injection.

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Nuclear Science, IEEE Transactions on  (Volume:28 ,  Issue: 6 )