2SD427-O 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): 70 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-O transistor can have a current gain of 70 to 140. The gain of the 2SD427 will be in the range from 40 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-O might only be marked "D427-O".The complementary PNP transistor to the 2SD427-O is the 2SB557-O.You can replace the 2SD427-O with the 2SC1079, 2SC1079-Y, 2SC1116, 2SC1116A, 2SC1585, 2SC1586, 2SC2337, 2SC2337A, 2SC2428, 2SC2431, 2SC2433, 2SC2522, 2SC2522A, 2SC2523, 2SD424, 2SD424-O, 2SD425, 2SD425-O, 2SD426, 2SD426-O, 2SD555, 2SD732, 2SD733, 2SD733K, 2SD745, 2SD745A, 2SD745B, 2SD746, 2SD746A, 2SD753, BUY69C, BUY70C, MJ15001, MJ15001G, MJ15003 or MJ15003G.