2SC5101 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 140 V
• Collector-Base Voltage, max: 200 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 10 A
• Collector Dissipation: 80 W
• DC Current Gain (h_fe): 50 to 180
• Transition Frequency, min: 20 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-3PF

Here is an image showing the pin diagram of this transistor.The 2SC5101 transistor can have a current gain of 50 to 180. The gain of the 2SC5101-O will be in the range from 50 to 100, for the 2SC5101-P it will be in the range from 70 to 140, for the 2SC5101-Y it will be in the range from 90 to 180.Sometimes the "2S" prefix is not marked on the package - the 2SC5101 might only be marked "C5101".You can replace the 2SC5101 with the 2SC4388, 2SC4886 or FJAF4310.