2SC3857 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 200 V
• Collector-Base Voltage, max: 200 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 15 A
• Collector Dissipation: 150 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: MT-200

Here is an image showing the pin diagram of this transistor.The 2SC3857 transistor can have a current gain of 50 to 180. The gain of the 2SC3857-O will be in the range from 50 to 100, for the 2SC3857-P it will be in the range from 70 to 140, for the 2SC3857-Y it will be in the range from 90 to 180.Sometimes the "2S" prefix is not marked on the package - the 2SC3857 might only be marked "C3857".The complementary PNP transistor to the 2SC3857 is the 2SA1493.You can replace the 2SC3857 with the 2SC2773 or 2SC3858.