2SD427 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 120 V
• Collector-Base Voltage, max: 120 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 8 A
• Collector Dissipation: 80 W
• DC Current Gain (h_fe): 40 to 140
• Transition Frequency, min: 5 MHz
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-3

Here is an image showing the pin diagram of this transistor.The 2SD427 transistor can have a current gain of 40 to 140. The gain of the 2SD427-O will be in the range from 70 to 140, for the 2SD427-R it will be in the range from 40 to 80.Sometimes the "2S" prefix is not marked on the package - the 2SD427 might only be marked "D427".The complementary PNP transistor to the 2SD427 is the 2SB557.You can replace the 2SD427 with the 2SC1079, 2SC2337, 2SC2337A, 2SC2428, 2SC2431, 2SC2433, 2SD424, 2SD425, 2SD426, 2SD555, 2SD732, 2SD733, 2SD733K, 2SD745, 2SD745A, 2SD745B, 2SD746, 2SD746A, 2SD753, BUY69C, BUY70C, MJ15001, MJ15001G, MJ15003 or MJ15003G.