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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
40 kΩ, 1/4 watt
M1
DC milliammeter
R1
4,700 Ω, 1/4 watt
S1
Trigger on switch, momentary type,
R2
270 Ω, 1/4 watt
normally open
R3
25 kΩ potentiometer
D1
1N457 diode
R4
FIGURE 5. Test circuit for holding current.
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