MIL-PRF-19500/551G
4.4.3 Group C inspection. Group C inspection shall be conducted in accordance with the conditions specified for
subgroup testing in table E-VII of MIL-PRF-19500 and as follows. Electrical measurements (end-points) shall be in
accordance with table I, subgroup 2 herein.
* 4.4.3.1 Group C inspection, table E-VII of MIL-PRF-19500.
Subgroup
Method
Conditions
*
C2
2036
Test condition A; weight = 12 pounds; t = 15 seconds minimum. Suitable fixtures
may be used to pull the end-caps in a manner which does not aid construction.
Reference to axial lead may be interpreted as end-cap with fixtures used for
mounting (see figure 6 herein).
*
C2
2038
US: Test condition B, weight = 12 pounds; t = 15 seconds.
C2
2036
Test condition E (Lead fatigue not applicable to US diodes).
RΘJL ≤ 60°C/W at L = .375 inches (9.53 mm), non-surface mount devices;
C5
4081
RΘJEC ≤ 20°C/W at L = 0 inches for surface mount devices.
TA = +125°C, (see 4.3.1). Leaded samples from the same lot may be used in lieu
C6
1026
of surface mount devices.
I(BR) = column 3 of table II, αV(BR), T1 = +25°C ±3°C; T2 = +125°C ±3°C;
C7
4071
maximum limits = column 8 of table II. Sample size: 22 devices, c = 0.
C8
See 4.5.2.a, ten pulses, sample size: 22 devices, c = 0.
4.4.4 Group E inspection. Group E inspection shall be conducted in accordance with the tests and conditions
specified for subgroup testing in table E-IX of MIL-PRF-19500, and table III herein. Electrical measurements (end-
points) shall be in accordance with table I, subgroup 2 herein.
4.5 Methods of inspection. Methods of inspection shall be as specified in the appropriate tables and as follows.
4.5.1 Pulse measurements. Conditions for pulse measurement shall be as specified in section 4 of MIL-STD-750.
4.5.2 Maximum peak pulse current (IPP ). The peak currents specified in column 7 of table II shall be applied in
the reverse direction while simultaneously maintaining a reverse bias voltage of not less than the applicable voltage
specified in column 4 of table II. The clamping voltage (Vc) shall be as specified in 4.5.3. The peak current shall be
applied with a current versus time waveform as follows (one pulse per minute maximum):
a. Pulse current shall reach 100 percent of IPP at t ≤ 8 µs and decay to 50 percent at t ≥ 20 µs for
tp = 20 µs (see figure 7).
b. Pulse current shall reach 100 percent of IPP at t ≤ 10 µs and decay to 50 percent at t ≥ 1 ms for
tp = 1 ms (see figure 8).
NOTE: Tolerance on pulse time shall be ±10 percent.
4.5.3 Clamping voltage VC. The peak pulse clamping voltage shall be measured across the diode in a 1 ms time
interval. The response detector shall demonstrate equipment accuracy of ±3 percent.
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