MILPRF19500/502G
4.3 Screening (JANTX and JANTXV levels 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)
JANTX and JANTXV levels only
3c (1)
Thermal impedance, see 4.3.1
9
ICEX1.
ICEX1, hFE2; ĆICEX1 = 100 percent of initial value or 2 µA dc, whichever is greater.
11
12
See 4.3.2.
13
See table I, subgroup 2 herein.
ĆICEX1 = 100 percent of initial value or 2 µA dc, whichever is greater.
ĆhFE2 = ±40 percent of initial value.
(1) This test shall be performed anytime after temperature cycling, screen 3a, and does 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 IM, IH, tH, tSW, (and VH where
appropriate). Measurement delay time (tMD) = 70 µs maximum. The thermal impedance limit used in screen 3c and
table I, subgroup 2 herein shall be set statistically by the supplier. See table II, subgroup 4 herein.
4.3.2 Power burn-in conditions. The power burn-in conditions shall be as follows: TJ = +162.5°C ± 12.5°C;
VCE ≥ 10 V dc, TA ≤ +100°C. NOTE: No heat sink or forced air cooling on the devices shall be permitted.
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 table I,
subgroup 2 herein.
4.4.2 Group B inspection. Group B inspection shall be conducted in accordance with the tests and conditions
specified for subgroup testing in table EVIB (JAN, JANTX, and JANTXV) of MILPRF19500 and as follows.
Electrical measurements (end-points) shall be in accordance with table I, subgroup 2 herein. Delta requirements
shall be in accordance with the applicable step of 4.6 herein.
Subgroup
Method
Conditions
VCB ≥ 10 V dc; ĆTJ = between cycles ≥ +100°C. ton = toff = 3 minutes for 2,000
B3
1037
cycles. No heat sink or forced-air cooling on the devices shall be permitted.
B5
3131
Not applicable.
6
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