2SB858 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -60 V
• Collector-Base Voltage, max: -70 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -4 A
• Collector Dissipation: 40 W
• DC Current Gain (h_fe): 60 to 320
• Transition Frequency, min: 15 MHz
• Operating and Storage Junction Temperature Range: -45 to +150 °C
• Package: TO-220

Here is an image showing the pin diagram of this transistor.The 2SB858 transistor can have a current gain of 60 to 320. The gain of the 2SB858-B will be in the range from 60 to 120, for the 2SB858-C it will be in the range from 100 to 200, for the 2SB858-D it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SB858 might only be marked "B858".The complementary NPN transistor to the 2SB858 is the 2SD1134.You can replace the 2SB858 with the 2SA1262, 2SA1488, 2SA1488A, 2SA1634, 2SA1635, 2SA770, 2SA771, 2SB633, BD204, BD244A, BD244B, BD244C, BD304, BD536, BD538, BD540A, BD540B, BD540C, BD544A, BD544B, BD544C, BD546A, BD546B, BD546C, BD798, BD800, BD802, BD808, BD810, BD950, BD952, BD954, BD956, BDT82, BDT82F, BDT84, BDT84F, BDT86, BDT86F, BDT88, BDT88F, BDX78, D44C10, D44C11, D44C12, D44C7, D44C8, D44C9, D45C10, D45C11, D45C12, D45C7, D45C8, D45C9, D45H11, D45H11FP, D45H8, MJE15029 or MJE15029G.