2SB646-D 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): 160 to 320
• 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-D transistor can have a current gain of 160 to 320. 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-C it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SB646-D might only be marked "B646-D".The complementary NPN transistor to the 2SB646-D is the 2SD666-D.You can replace the 2SB646-D with the 2SA1016, 2SA1016F, 2SA1016K, 2SA1016KF, 2SA1017, 2SA1017F, 2SA1123, 2SA1124, 2SA1207, 2SA1208, 2SA1275, 2SA1275-Y, 2SA1285, 2SA1285A, 2SA1319, 2SA1450, 2SA935, 2SA954, 2SA984K, 2SA984K-F, 2SB560, 2SB560-F, 2SB647, 2SB647D, HSB1109S, HSB1109S-D, KSA1013, KSA1013Y, KSA709C, KTA1275, KTA1275Y or NTE383.