MIL-PRF-19500/488E
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a. Qualification inspection (see 4.2).
b. Screening (see 4.3).
*
c. Conformance inspection (see 4.4 and tables I).
4.2 Qualification inspection. Qualification inspection shall be in accordance with MIL-PRF-19500 and as specified
herein.
* 4.2.1 Group E qualification. Group E inspection shall be performed for qualification or re-qualification only. In case
qualification was awarded to a prior revision of the specification sheet that did not request the performance of table II
tests, the tests specified in table II herein that were not performed in the prior revision shall be performed on the first
inspection lot of this revision to maintain qualification.
* 4.3 Screening (JANS, JANTX, and JANTXV levels only). Screening shall be in accordance with 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.
Screen (see table E-IV
Measurement
of MIL-PRF-19500)
JANS level
JANTX and JANTXV levels
(1) 3c
Thermal impedance (see 4.3.2)
Thermal impedance (see 4.3.2)
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ICEX1 and hFE1
ICEX1
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ICEX1 and h FE1;
ICEX1 and hFE1;
ICEX1 = 100 percent of initial value
ICEX1 = 100 percent of initial value
or 20 A dc, whichever is greater.
or 20 A dc, whichever is greater.
hFE1 = 15 percent of initial value.
12
See 4.3.1
See 4.3.1
Subgroup 2 of table I herein.
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Subgroups 2 and 3 of table I herein.
ICEX1 = 100 percent of initial value
ICEX1 = 100 percent of initial value
or 20 A dc , whichever is greater.
or 20 A dc, whichever is greater.
hFE1 = 25 percent of initial value.
hFE1 = 15 percent of initial value.
(1)
Shall be performed anytime after temperature cycling, screen 3a; and does not need to be repeated in
screening requirements.
4.3.1 Power burn-in conditions. Power burn-in conditions are TJ = +187.5 12.5C, VCB 30 V dc, TA = +35C
max. TJ measurement shall be in accordance with method 3100 of MIL-STD-750.
* 4.3.2 Thermal impedance. The thermal impedance measurements shall be performed in accordance with method
3131 of MIL-STD-750 using the guidelines in that method for determining IM, IH, tH, tSW, (and VH where appropriate).
Measurement delay time (tMD) = 70 s max. See table II, group E, subgroup 4 herein.
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