2SC4278-E Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 150 V
• Collector-Base Voltage, max: 150 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 10 A
• Collector Dissipation: 100 W
• DC Current Gain (h_fe): 100 to 200
• Transition Frequency, min: 20 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-247

Here is an image showing the pin diagram of this transistor.The 2SC4278-E transistor can have a current gain of 100 to 200. The gain of the 2SC4278 will be in the range from 60 to 320, for the 2SC4278-D it will be in the range from 60 to 120, for the 2SC4278-F it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SC4278-E might only be marked "C4278-E".The complementary PNP transistor to the 2SC4278-E is the 2SA1633-E.You can replace the 2SC4278-E with the 2SD1717, 2SD1717-P, 2SD1718, 2SD1718-P, MJW3281A or MJW3281AG.