View bc549 bc550 datasheet:

MOTOROLAOrder this documentSEMICONDUCTOR TECHNICAL DATAby BC549B/DLow Noise TransistorsNPN SiliconBC549B,CBC550B,CCOLLECTOR12BASE3EMITTER1MAXIMUM RATINGS23Rating Symbol BC549 BC550 UnitCASE 2904, STYLE 17CollectorEmitter Voltage VCEO 30 45 VdcTO92 (TO226AA)CollectorBase Voltage VCBO 30 50 VdcEmitterBase Voltage VEBO 5.0 VdcCollector Current Continuous IC 100 mAdcTotal Device Dissipation @ TA = 25C PD 625 mWDerate above 25C 5.0 mW/CTotal Device Dissipation @ TC = 25C PD 1.5 WattDerate above 25C 12 mW/COperating and Storage Junction TJ, Tstg 55 to +150 CTemperature RangeTHERMAL CHARACTERISTICSCharacteristic Symbol Max UnitThermal Resistance, Junction to Ambient RqJA 200 C/WThermal Resistance, Junction to Case RqJC 83.3 C/WELECTRICAL CHARACTERISTICS (TA = 25C unless otherwis

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