MIL-PRF-19500/552G
* 4.4.3.1 Group C inspection, appendix E, table E-VII of MIL-PRF-19500.
Subgroup
Method
Conditions
*
C2
2036
Test condition A, 20 pounds, t = 15 seconds, ±3 seconds. 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). (Lead
fatigue is not applicable to US or URS devices.)
*
C2
2038
US devices: Test condition B, weight = 20 pounds; t = 15 seconds.
RΘJL ≤ 50°C/W at L = .375 inch (9.53 mm), non-surface mount devices.
C5
4081
RΘJEC ≤ 20°C/W at L = 0 inches, surface mount devices. TA = +25°C.
TA = +125°C (see 4.3.1).
C6
1026
C7
1018
Not required.
Maximum peak pulse current; conditions, see 4.5.2.b (20 µs pulse only) 10 pulses; 22
C8
devices, c = 0.
C9
4071
herein, T1 = +25°C ±3°C; T2 = +125°C; maximum limits = column 8 of table II herein;
units = %/°C; 22 devices, c = 0.
4.4.4 Group E inspection. Group E inspection shall be conducted in accordance with the conditions specified for
subgroup testing in appendix E, table E-IX of MIL-PRF-19500 and as specified herein. Electrical measurements
(end-points) shall be in accordance with table I, subgroup 2 herein. See table III herein for delta limits when
applicable.
4.5 Methods of inspection. Methods of inspection shall be as specified in the appropriate tables and as follows:
4.5.1 Group C steady-state operation life test (alternate procedure). When the group B, 340 hour life test is
continued on test to 1,000 hours to satisfy the group C life test requirements, the test shall be performed as given in
4.5.2 Maximum peak pulse current (IPP). The peak currents specified in column 7 of table II herein 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 herein. 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 (1 pulse per minute maximum):
Pulse current shall reach 100 percent of IPP at t ≤ 10 µs and decay to 50 percent at t ≥ 1 ms for
a.
tp ≥ 1 ms.
Pulse current shall reach 100 percent of IPP at t ≤ 8 µs and decay to 50 percent at t ≥ 20 µs for
b.
tp ≥ 20 µs.
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. The peak clamping
voltage, as specified in column 6 of table II herein, shall be applicable to the 1 ms pulse of 4.5.2.a only.
8
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