MIL-PRF-19500/594B
4.3.1 Burn-in conditions. Burn-in conditions are as follows: TA = +150°C; VR = 0.8 to 0.85 rated VR dc (see 1.3).
* 4.3.2 Thermal impedance ZθJX measurements for screening. 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.
4.3.2.1 Thermal impedance (ZθJX measurements) for initial qualification or requalification. The ZθJX
measurements shall be performed in accordance with method 3101 of MIL-STD-750, (read and record date ZθJX).
ZθJX shall be supplied on one lot (500 pieces minimum and a thermal response curve shall be submitted. Twenty-two
of these samples shall be serialized and provided to the qualifying activity for correlation prior to shipment of parts.
Measurements conditions shall be in accordance with 4.4.1.
4.3.3 Surge current. Surge current, see method 4066 of MIL-STD-750. IFSM = 50 A; 6 surges; tp = 8.3 ms or
rectangular pulse of equivalent Irms; 3 surges. IO = 0 A; VRMS = 0 V; duty factor 1 percent minimum TA = +25°C.
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. The following test conditions shall be used for ZθJX, group A inspection: ZθJX ≤ 2.5°C/W.
a. IH = 5 A minimum.
b. tH ≥ 100 ms.
c. IM = 10 mA to 200 mA.
d. tMD = 200 µs maximum.
* 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 (JANTX and JANTXV) of MIL-PRF-19500. Electrical
measurements (end-points) and delta requirements shall be in accordance with the applicable steps of table III
herein.
4.4.2.1 Group B inspection, table E-VIa (JANS) of MIL-PRF-19500.
Method
Conditions
Subgroup
TC = +100°C; tp ≤ 8.3 ms; VR = rated VR (see 1.3); six 8.3 ms surges; 1
B3
4066
surge/minute maximum. IF (surge) = 50 A dc; IO = 10 A dc.
B3
2037
Test condition D, all internal wires for each device shall be pulled separately.
2,000 cycles, 25 percent rated IO ≤ IO applied ≤ rated IO (see 4.5.2).
B4
1037
IF ≥ 0.5 A dc at TA = +25°C, for 96 hours, or adjusted as required by the chosen
B5
1027
TA to give an average lot at TJ = +275°C.
See 4.4.1 except tH ≥ 500 ms.
B6
3101
5
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