2SD858 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 60 V
• Collector-Base Voltage, max: 60 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 5 A
• Collector Dissipation: 60 W
• DC Current Gain (h_fe): 40 to 250
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3P

Here is an image showing the pin diagram of this transistor.The 2SD858 transistor can have a current gain of 40 to 250. The gain of the 2SD858-P will be in the range from 120 to 250, for the 2SD858-Q it will be in the range from 70 to 150, for the 2SD858-R it will be in the range from 40 to 90.Sometimes the "2S" prefix is not marked on the package - the 2SD858 might only be marked "D858".The complementary PNP transistor to the 2SD858 is the 2SB763.You can replace the 2SD858 with the BD245A, BD245B, BD245C, BD249A, BD249B, BD249C, BDV91, BDV93, BDV95 or TIP35CA.