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MIL-PRF-19500-198 Semiconductor Device, Thyristors, Types 2N1870A, 2N1871A, 2N1872A, And 2N1874A, JanThis specification covers the performance requirements for silicon thyristors. One level of product assurance is provided for each device type as specified in MIL-PRF-19500.

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MIL-PRF-19500/198E
20 Ω, 20 watt
T1
115 VAC adjustable transformer
R2
1,000 Ω, 1/4 watt
T2
115 VAC adjustable transformer
R3
T3
Step up transformer 115 VAC to 140 VAC
M1
Peak reading voltmeter or RMS equivalent (0 - 250
T4
Step down transformer 115 VAC to 12 VAC
volts)
T5
Step down transformer 115 VAC to 3.0 VAC
M2
DC millimeter 0 - 300 mA
D1, D2
1N540
M3
Peak reading voltmeter or RMS equivalent (0 - 10
20 kΩ, 1/2 watt
R1
volts)
FIGURE 6. Operational life test circuit.
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