View csd1638 datasheet:

Continental Device India LimitedAn ISO/TS 16949, ISO 9001 and ISO 14001 Certified CompanyNPN SILICON PLASTIC POWER DARLINGTON TRANSISTOR CSD1638(9AW)TO126 MARKING : CDIL D1638Low Freq. Power Amp.ABSOLUTE MAXIMUM RATINGS(Ta=25deg C)DESCRIPTION SYMBOL VALUE UNITCollector -Base Voltage VCBO 100 VCollector -Emitter Voltage VCEO 100 VEmitter Base Voltage VEBO 6.0 VCollector Current Continuous IC 2.0 A Peak* 3.0 ACollector Power Dissipation @ Ta=25 deg C PC 1.2 WCollector Power Dissipation @ Tc=25 deg C 10 WJunction Temperature Tj 150 deg CStorage Temperature Range Tstg -55 to +150 deg C*Single Pulse Pw=100msELECTRICAL CHARACTERISTICS (Ta=25 deg C Unless Specified)DESCRIPTION SYMBOL TEST CONDITION MIN TYP MAX UNITCollector Emitter Voltage VCEO IC=5mA, IB=0 100 - - VCollector Base Voltage VCBO IC=50uA, IE=0 100 - - VCollector Cut off Current IC

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