2N2484UB Temperature-Power Derating Curve
NPN Silicon Amplifier Transistor. Package, UA, UB, UBC [TO-18 Metal Can].

2N2484UB Surface Mount Package Derating Graph
Use the Graph to determine how much to derate power [wattage] based on ambient operational temperature. Transistor Derating Curves
Temperature derating is a standard design practice for electrical engineers.
Refer to MIL-PRF-19500/376H; Semiconductor Device, Transistor, NPN, Silicon, Low-Power, Types 2N2484, 2N2484UA, 2N2484UB, 2N2484UBC, JAN, JANTX, JANTXV, JANS, JANSM, JANSD, JANSP, JANSL, JANSR, JANSF, JANSG, JANSH JANHCA, JANHCB, JANKCA, JANKCB, JANKCM, JANKCD, JANKCP, JANKCL, JANKCR, JANKCF, JANKCG, and JANKCH, [Surface Mount]
Transistor Manufacturers and vendors

Surface Mount UB Package
How to Derate; Recommendations for Derating Electronic Components









