MIL-PRF-19500/628C
4.5.3.1 Free air burn-in. The use of a current limiting or ballast resistor is permitted provided that each DUT still
sees the full Pt (minimum) and that the minimum applied voltage, where applicable, is maintained through-out the
burn-in period. TJ = +115°C minimum and +150°C maximum for screening, and TJ = +125°C minimum for 4.4.2.2
4.5.4 Scope display evaluation. Scope display evaluation shall be stable in accordance with method 4023 of
MIL-STD-750. Scope display may be performed on ATE (automatic test equipment) for screening only with the
approval of the qualifying activity. Scope display in table I, subgroup 4 shall be performed on a scope. Reverse
current (IBR) over the knee shall be 500 µA peak.
4.5.5 Thermal resistance. Thermal resistance measurement shall be performed in accordance with method 4081
of MIL-STD-750 using the guidelines in that method for determining IM, IH, and tH. Measurement delay time tMD = 100
µs max. See table E-IX of MIL-PRF-19500.
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