2SD425-R Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 140 V
• Collector-Base Voltage, max: 140 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 12 A
• Collector Dissipation: 100 W
• DC Current Gain (h_fe): 40 to 80
• 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 2SD425-R transistor can have a current gain of 40 to 80. The gain of the 2SD425 will be in the range from 40 to 140, for the 2SD425-O it will be in the range from 70 to 140.Sometimes the "2S" prefix is not marked on the package - the 2SD425-R might only be marked "D425-R".The complementary PNP transistor to the 2SD425-R is the 2SB555-R.You can replace the 2SD425-R with the 2N5038, 2N5038G, 2N6340, 2N6340G, 2N6341, 2N6341G, 2SC2428, 2SD424, 2SD424-R, 2SD552, 2SD552-R, 2SD733, 2SD733-C, 2SD733K, 2SD733K-C, 2SD753, MJ15001, MJ15001G, MJ15003 or MJ15003G.