cmbta44.pdf datasheet:

Continental Device India LimitedAn ISO/TS 16949, ISO 9001 and ISO 14001 Certified CompanyNPN SILICON PLANAR EPITAXIAL TRANSISTOR CMBTA44PIN CONFIGURATION (NPN)SOT-231 = BASE2 = EMITTERFormed SMD Package3 = COLLECTOR312Marking Code is =3ZDesigned for Extremely High Voltage ApplicationsABSOLUTE MAXIMUM RATINGS (Ta=25C)DESCRIPTION SYMBOL VALUE UNITSCollector Base Voltage VCBO 450 VVCEOCollector Emitter Voltage 400 VVEBOEmitter Base Voltage 6 VICCollector Current 300 mAPDCollector Power Dissipation 350 mWOperating And Storage Junction Tj, Tstg - 65 to+150 CTemperature RangeTHERMAL RESISTANCEJunction to Ambient in free air Rth(j-a) 357 C/WElectrical Characterstics (Ta=25C unless specified otherwise) DESCRIPTION SYMBOL CONDITIONS MIN TYP MAXUNITICBO VCB=400V, IE=0Collector Cut Off Current 100 nAICES VCE=400V, VBE=