MILPRF19500/427P
4.3.1 Thermal impedance. The thermal impedance measurements shall be performed in accordance with method
3101 of MIL-STD-750 using the guidelines in that method for determining IM, IH, tH, and K factor where appropriate.
Measurement delay time (tMD) = 70 ”s max. The limits will be statistically derived. See table II, group E, subgroup 4
herein.
4.3.2 Power burn-in conditions. Power burn-in conditions are as follows (see 4.5.3, 4.5.3.1). IO(min) = 1 A
minimum; TA = 55șC maximum. Test conditions in accordance with method 1038 of MIL-STD-750, condition B.
Adjust IO or TA to achieve the required TJ. TJ = 135șC minimum and 175șC maximum. With approval of the qualifying
activity and preparing activity, alternate burn-in criteria (hours, bias conditions, TJ, mounting conditions) may be used
for JANTX and JANTXV quality levels. A justification demonstrating equivalence is required. In addition, the
manufacturing site's burn-in data and performance history will be essential criteria for burn-in modification approval.
4.3.3 Screening (JANHC and JANKC). Screening of die shall be in accordance with appendix G of
MIL-PRF-19500. As a minimum, die shall be 100-percent probed to ensure compliance with group A, subgroup 2 of
MIL-PRF-19500. Burn-in duration for the JANKC level follows JANS requirements; the JANHC follows JANTX
requirements.
4.4 Conformance inspection. Conformance inspection shall be in accordance with MIL-PRF-19500 and as
specified herein.
4.4.1 Group A inspection. Group A inspection shall be conducted in accordance with table E-V of
MIL-PRF-19500 and table I herein. The ZθJX end-point shall be derived by the supplier and approved by the
qualifying activity. The ZθJX end-point shall also be documented in the qualification report.
* 4.4.2 Group B inspection. Group B inspection shall be conducted in accordance with the conditions specified for
subgroup testing in table E-VIA (JANS) and table E-VIB (JAN, JANTX, and JANTXV) of MIL-PRF-19500 and as
follows: Electrical measurements (end-points) shall be in accordance with the applicable inspections in table I,
subgroup 2 herein. Delta measurements shall be as specified in table III herein.
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