MIL-PRF-19500/443B
4.4.3 Group C inspection. Group C inspection shall be conducted in accordance with the conditions specified for subgroup testing
in table 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.
Subgroup
Method
Condition
C2
2036
Test condition E.
C6
--1027
IO = 70 mA dc minimum, VR = 120 V(pk), f = 60 Hz. TA = room ambient as defined in the
general requirements of MIL-STD-750, minimum, TJ = 150°C minimum.
4.5 Methods of inspection. Methods of inspection shall be as specified in the appropriate tables.
4.5.1 Pulse measurements. Conditions for pulse measurement shall be as specified in section 4 of MIL-STD-750.
4.5.2 Effective carrier lifetime (τCL). Carrier lifetime may be measured using any of the following methods.
4.5.2.1 Reverse recovery time method. This test shall be conducted in accordance with MIL-STD-750, method 4031, condition B with
the device installed in the test fixture, drawing C68001 or equivalent. The test parameters shall be: IF = 50 mA, Ir = 30 mA, I(rec) = 3 mA.
4.5.2.2 Stored charge meter method. A pulse from a 20 kHz ± 200 Hz pulse generator and forward bias from a power supply shall be
applied to the diode under test. Reverse current shall be 250 mA dc and forward bias shall be 50 mA dc. Read voltage on digital voltmeter
and divide by 100 ohms to obtain average reverse current. Divide average reverse current by the product of pulse repetition frequency and
bias current to obtain carrier lifetime (or equivalent) (see figure 2).
4.5.2.3 Stored charge meter method. Stored charge meter method (using commercial meter). Determine stored charge using meter
manufacturer's instructions and a forward bias of 50 mA dc. Calculate the carrier lifetime by dividing the stored charge (coulombs) by the
forward bias (amperes).
4.5.3 Series resistance (RS). This test shall be performed utilizing an appropriate impedance analyzer such as the Hewlett Packard
NO. 4191A or a vector network analyzer such as the Hewlett Packard No. 8753B (or equivalent).
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