MIL-PRF-19500/408K
4.3 Screening (quality levels JANS, JANTX and JANTXV only). Screening shall be in accordance with table EIV
of MILPRF19500, 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 table EIV
of MILPRF19500)
JANS level
JANTX and JANTXV levels
3c (1)
Thermal impedance (see 4.3.1).
Thermal impedance (see 4.3.1).
ICES1 and hFE2
ICES1
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ICES1 and hFE2;
ICES1 and hFE2;
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ĆICES1 = 100 percent of initial value
ĆICES1 = 100 percent of initial value
or 1 µA dc, whichever is greater.
or 1 µA dc, whichever is greater.
ĆhFE2 = ±15 percent of initial value.
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See 4.3.2
See 4.3.2
ĆICES1 = 100 percent of initial value
ĆICES1 = 100 percent of initial value
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or 1 µA dc, whichever is greater;
or 1 µA dc, whichever is greater;
ĆhFE2 = ±15 percent of initial value;
ĆhFE2 = ±20 percent of initial value;
subgroup 2 of table I herein
subgroup 2 of table I herein
(1) Thermal impedance shall be performed anytime after temperature cycling (screen 3a), JANTX and JANTXV
levels do not need to be repeated in screening requirements.
4.3.1 Thermal impedance. The thermal impedance measurements shall be performed in accordance with test
method 3131 of MILSTD750 using the guidelines in that test method for determining IH, IM, tH, tSW, (and VH where
appropriate). See table II, subgroup 4 (group E) herein.
4.3.2 Power burn-in conditions. Power burn-in conditions shall be as follows: TJ = +187.5 ±12.5°C;
VCE = 25 ±5 V dc; TA = room ambient as defined in the general requirements of MILSTD750. With approval of the
qualifying activity and preparing activity, alternate burn-in criteria (hours, bias conditions, TJ, and mounting
conditions) may be used for quality levels JANTX and JANTXV. 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 MILPRF19500, and as
specified herein.
4.4.1 Group A inspection. Group A inspection shall be conducted in accordance with table EV of
MILPRF19500 and table I herein. Electrical measurements (end-points) shall be in accordance with the applicable
inspections of table I, subgroup 2 herein.
4.4.2 Group B inspection. Group B inspection shall be conducted in accordance with the conditions specified for
subgroup testing in table EVIA (JANS) and table EVIB (JAN, JANTX and JANTXV) of MILPRF19500, and as
follows. Electrical measurements (end-points) shall be in accordance with table I, subgroup 2. Delta requirements
shall be in accordance with the applicable steps of 4.6 herein.
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