MIL-PRF-19500/193F
4.2.2 Thermal impedance. The thermal impedance measurements shall be performed in accordance with method
3131 or 4081 of MIL-STD-750 using the guidelines in that method for determining IM, IH, tH, tSW (VC and VH where
appropriate). Measurement delay time (tMD) = 70 µs max. The thermal impedance limit used in table I, subgroup 2
shall be set statistically by the supplier.
4.3 Conformance inspection. Conformance inspection shall be in accordance with MIL-PRF-19500 and as
specified herein.
4.3.1 Group A inspection. Group A inspection shall be conducted in accordance with MIL-PRF-19500, and table I
herein. Electrical measurements (end-points) shall be in accordance with the table I, group A, subgroup 2 herein.
4.3.2 Group B inspection. Group B inspection shall be conducted in accordance with the conditions specified for
subgroup testing in table E-VIb (JAN) of MIL-PRF-19500 and as specified in 4.3.2.1. Electrical measurements (end-
points) shall be in accordance with the table I, group A, subgroup 2 herein.
* 4.3.2.1 Group B inspection, table E-VIb (JAN) of MIL-PRF-19500.
Subgroup
Method
Condition
0°C to +100°C, 10 cycles.
B2
1056
-55°C to +175°C.
B2
1051
IF = 100 mA, axial tensile stress = 8 lbs, TA = +150°C.
B2
2005
IO = 150mA (min), VR = VRWM (min), f = 50-60 Hz, TJ = 150°C (min), adjust IO
B3
1027
or TA to obtain a min TJ of +150°C (min) (see 4.4.1).
TA = +175°C.
B6
1032
* 4.3.3 Group C inspection. Group C inspection shall be conducted in accordance with the conditions specified for
subgroup testing in table E-VII of MIL-PRF-19500, and as follows. Electrical measurements (end-points) shall be in
accordance with the table I, group A, subgroup 2 herein (except for thermal impedance).
Method
Condition
Subgroup
C2
2036
Tension: Test condition A; weight = 4 lbs; t = 15 seconds
Lead fatigue: Test condition E, weight = 16 oz
L = .375 inch (9.53 mm), RΘJL = 250°C/W maximum; RΘJEC = 100°C/W; (see
C5
4081
4.3.5), 22 devices, c = 0.
IO = 150mA (min), VR = VRWM (min), f = 50-60 Hz, TJ = 150°C (min), adjust IO
C6
1027
or TA to obtain a min TJ of +150°C (min) (see 4.4.1).
4.3.4 Group E inspection. Group E inspection shall be conducted in accordance with the tests and conditions
specified for subgroup testing in table E-IX of MIL-PRF-19500, and table II herein. Electrical measurements (end-
points) shall be in accordance with table I, subgroup 2 herein.
* 4.3.5 Thermal resistance. Thermal resistance measurement shall be performed in accordance with method 3101
or 4081 of MIL-STD-750. Read and record data and information shall be included in the qualification report. Forced
moving air or draft shall not be permitted across the devices during test. See 1.3 for maximum limits.
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