MIL-PRF-19500/228R
4.3 Screening (JANTX level only). 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 of MIL-PRF-19500)
JANTX level
See 4.3.2.
(1) 3c
9
Not applicable.
10
Method 1038 of
MIL-STD-750, condition A
11
IR1 and VF2.
12
See 4.3.1.
(2) 13
Subgroup 2 of table I herein.
ĆIR1 ≤100 percent of initial reading or
±50 nA dc, whichever is greater.
ĆVF2 ≤ ±0.1 V dc. Scope display
evaluation (see 4.5.3).
(1) Shall be performed anytime after temperature cycling, screen 3a, and does not need to be repeated in
screening requirements.
(2) For clear glass diodes, the hermetic seal (gross leak) may be performed at anytime after temperature cycling.
4.3.1 Power burn-in conditions. Power burn-in conditions are as follows (see 4.5.1): IO(min) = 1A, VRWM as specified
(see 1.3 herein). TA = 55°C maximum. Test conditions in accordance with method 1038 of MIL-STD-750, condition
B. Adjust IO or TA to achieve the required TJ. TJ = 135°C minimum, 175°C 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 quality level. 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.
* 4.3.2 Thermal impedance. The thermal impedance measurements shall be performed in accordance with method
3101 as applicable of MIL-STD-750 using the guidelines in that method for determining IM, IH, and tH. 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. See table II, subgroup 4 herein. Thermal impedance limit used by supplier shall not
exceed the thermal impedance graph, see figure 2 herein.
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 appendix E, table E-V of
MIL-PRF-19500 and table I herein.
5
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