2SB631K-D Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -120 V
• Collector-Base Voltage, max: -120 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -1 A
• Collector Dissipation: 8 W
• DC Current Gain (h_fe): 60 to 120
• Transition Frequency, min: 130 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The 2SB631K-D transistor can have a current gain of 60 to 120. The gain of the 2SB631K will be in the range from 60 to 320, for the 2SB631K-E it will be in the range from 100 to 200, for the 2SB631K-F it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SB631K-D might only be marked "B631K-D".The complementary NPN transistor to the 2SB631K-D is the 2SD600K-D.You can replace the 2SB631K-D with the 2SA1021, 2SA1021-R, 2SA1220, 2SA1220-R, 2SA1220A, 2SA1220A-R, 2SA1408, 2SA1408-R, 2SB649, 2SB649-B, 2SB649A, 2SB649A-B, KSA1220, KSA1220-R, KSA1220A or KSA1220A-R.