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MIL-PRF-19500-581 Semiconductor Device, Transistor, Npn, Silicon Amplifier, Types 2N4237, 2N4238, And 2N4239, Jan, Jantx, And JantxvThis specification covers the performance requirements for NPN, silicon, amplifier transistors. Three levels of product assurance are provided for each device type as specified in MIL-PRF-19500.

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MIL­PRF­19500/581C
Maximum Thermal Impedance
0.000001
0.00001
0.0001
0.001
0.01
0.1
1
10
100
1000
10000
1000
100
10
1
0.1
Time (s)
TA = +25°C, thermal resistance = 175°C/W.
FIGURE 4. Thermal impedance graph at TA for device types 2N4237, 2N4238, and 2N4239.
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