2N2222 Temperature-Power Derating Curve
NPN General Purpose Silicon Transistor. Package, TO-18 Metal Can.
Temperature Derating Curve for 2N2222A Transistor, TO-18 Case
Use the Graph to determine how much to derate power [wattage] based on ambient operational temperature of a 2N2222A in a TO-18 package. Transistor Derating Curves
Temperature derating is a standard design practice for electrical engineers.
Note that the maximum operating temperature in free air [still air] is 2000C, but at zero power dissipation. Applying forced air to the system via a Fan, or installing a Heat-Sink to the metal can will allow the 2N2222 to operate at a higher temperature at a given current draw.
Refer to MIL-PRF-19500/255W Semiconductor Device, Transistor, NPN, Silicon, Switching, Types 2N2221A, 2N2221AL, 2N2222A, 2N2222AL, 2N2221AUA, 2N2222AUA, 2N2221AUB, 2N2222AUB, 2N2221AUBC, and 2N2222AUBC, JAN, JANJ, JANTX, JANTXV, JANTXVM, JANTXVD, JANTXVP, JANTXVL, JANTXVR, JANTXVF, JANTXVG, JANTXVH, JANS, JANSM, JANSD, JANSP, JANSL, JANSR, JANSF, JANSG, JANSH, JANHC, JANHCM, JANHCD, JANHCP, JANHCL, JANHCR, JANHCF, JANHCG, JANHCH, JANKC, JANKCM, JANKCD, JANKCP, JANKCL, JANKCR, JANKCF, JANKCG, and JANKCH, [TO-18]
2N2222A Maximum Operational Ratings:
Collector Emitter Voltage = 50 volts dc
Collector Base Voltage = 75 volts dc
Emitter Base Voltage = 6 volts dc
Power Dissipation 250C = 500mW
Operating Temperature = -65 to +2000C [maximum operational temperature]
Check the 2N2222 Datasheet for additional parameters.
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How to Derate; Guideline for Derating Electronic Components
