2N2222 Transistor Derating Curves

2N2222A Temperature-Power Derating Curve, Case Mounted
NPN General Purpose Silicon Transistor. Package, TO-18 Metal Can.
2N2222: Application; Medium power amplifier and transistor switch

Temperature Derating Curve for 2N2222 Transistor

Use the Graph to determine how much to derate power based on Case Temperature of a 2N2222 in a TO-18 package. For best results engineer the design to use one of the two lower 'gray' lines. Or design the circuit to operate near the lower lines, but parallel to them. The third curve represents the maximum power dissipation possible in a circuit. The top most curve represents component break-down [How to Read Transistor Derating Curves].
Additional Transistor Derating Curves.
Temperature derating is a standard design practice for electrical engineers.

Refer to MIL-PRF-19500/255W; Semiconductor, Transistor, NPN, 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 Ratings:
Collector Emitter Voltage = 50 volts dc [Vceo]
Collector Base Voltage = 75 volts dc [Vcbo]
Emitter Base Voltage = 6 volts dc [Vebo]
Collector Current = 800mA dc [Ic]
Power Dissipation 25⁰C = 500mW
Operating Temperature = -65 to +200⁰C

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To achieve higher temperature operation with a particular current drain use forced air or attach a heatsink; Heat Sink Manufacturers [Clip-on style heatsinks]
The derating curve represents free, still air. The 2N2222 is operated with out a fan and not placed in a case, so air is allowed to move freely around the component.

Case mount. A type of package (outline) which provides a method of readily attaching one surface of the semiconductor device to a heat dissipater to achieve thermal management of the case temperature. This device has the collector internally connected to the case.

Case temperature. Case temperature is that temperature measured at a specified point on the case of a semiconductor device.

How to Derate; Guideline for Derating Electronic Components