2N3250A Temperature-Power Derating Curve [2N3251A]
PNP General Purpose Silicon Transistor. Package, TO-18 metal Can.
2N3250 Transistor Derating Graph
Use the Curves to determine how much to derate power [wattage] based on ambient temperature. The graph relates to the temperature of the Printed Circuit Board [PCB] in free air. Apply forced air to the 2N3250A to allow the device to dissipate more heat.
As with any of these graphs in this section, any of those curves will work. The right most curve is the not to exceed line, pick one of the other curves to use depending on the amount of protection [reliability] the design needs. Operating parallel to the left most curve would be the solution giving the highest operational reliability.
Transistor Derating Curves, or Component Derating Guidelines.
Refer to MIL-PRF-19500/323; Semiconductor, Transistor, PNP, Silicon, Switching, Types 2N3250A, 2N3251A, 2N3250AUB, 2N3251AUB, JAN, JANTX, JANTXV, JANS, JANHC, and JANKC, [TO-18, UB, which is the surface mount version]
2N3250A Maximum Electrical Ratings:
Collector Emitter Voltage = 60 volts dc [Vceo]
Collector Base Voltage = 60 volts dc [Vcbo]
Emitter Base Voltage = 5 volts dc [Vebo]
Power Dissipation 250C = 360 mW
Operating Temperature = -65 to +2000C
