MIL-PRF-19500/359K
4.3 Screening (JANTX and JANTXV levels). Screening shall be in accordance with appendix E, table E-IV of MIL-
PRF-19500, and as specified herein. The following measurements shall be made in accordance with table I herein.
Devices that exceed the limits of table I herein shall not be acceptable.
Measurement
Screen (see appendix
E, table E-IV
JANTX and JANTXV levels
of MIL-PRF-19500)
(1) 3c
Thermal impedance (see 4.3.1).
9
Not applicable.
11
IR1 and VFM1.
12
See 4.3.2 and 4.5.3.
(2) 13
Subgroup 2 of table I herein: ĆIR1 ≤ ±100 percent of initial reading or ±50 nA dc
whichever is greater.
ĆVFM1 ≤ +0.1 V dc, -0.2 V dc.
Scope display evaluation (see 4.5.4).
(1) Thermal impedance shall be performed any time after sealing provided temperature cycling is performed in
accordance with MIL-PRF-19500, screen 3 prior to this thermal test.
(2) ZθJX is not required in screen 13, if already previously performed.
4.3.1 Thermal impedance. The thermal impedance measurements shall be performed in accordance with method
3101 of MIL-STD 750 as applicable, using the guidelines in that method for determining IM, IH, tH, and K factor where
appropriate). Measurement delay time (tMD) = 70 µs max. The thermal impedance limit used in screen 3c and table
I, subgroup 2 shall be set statistically by the supplier.
4.3.2 Power burn-in conditions. Power burn-in conditions are as follows (see 4.5.3 and 4.5.3.1): IO(min) = 1 A dc.
TA = +55°C maximum. Test conditions in accordance with method 1038 of MIL-STD-750, condition B. Use method
3100 of MIL-STD-750 to measure TJ. Adjust IO or TA to achieve the required TJ. TJ = 135°C minimum. 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.
4.4 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 MIL-PRF-19500 and table I
herein. ZθJX endpoint shall be derived by the supplier and approved by the qualifying activity. This ZθJX end-point
shall be documented in the qualification report
5
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