2SB646-C Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -80 V
• Collector-Base Voltage, max: -120 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.05 A
• Collector Dissipation: 0.9 W
• DC Current Gain (h_fe): 100 to 200
• Transition Frequency, min: 140 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92MOD

Here is an image showing the pin diagram of this transistor.The 2SB646-C transistor can have a current gain of 100 to 200. The gain of the 2SB646 will be in the range from 60 to 320, for the 2SB646-B it will be in the range from 60 to 120, for the 2SB646-D it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SB646-C might only be marked "B646-C".The complementary NPN transistor to the 2SB646-C is the 2SD666-C.You can replace the 2SB646-C with the 2N5401C, 2SA1013, 2SA1013O, 2SA1017, 2SA1017E, 2SA1024, 2SA1145, 2SA1207, 2SA1207-R, 2SA1208, 2SA1208-R, 2SA1275, 2SA1275-O, 2SA1284, 2SA1315, 2SA1319, 2SA1319-R, 2SA1450, 2SA1450-R, 2SA1533, 2SA777, 2SA817, 2SA817A, 2SA935, 2SA949, 2SA954, 2SA965, 2SA984K, 2SA984K-E, 2SB560, 2SB560-E, 2SB646A, 2SB646A-C, 2SB647, 2SB647A, 2SB647AC, 2SB647C, HSB1109S, HSB1109S-C, KSA1013, KSA1013O, KSA709C, KSA916, KSP8599C, KTA1023, KTA1023-O, KTA1023-Y, KTA1024, KTA1274, KTA1275 or KTA1275O.