KSA643C Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -20 V
• Collector-Base Voltage, max: -40 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.5 A
• Collector Dissipation: 0.5 W
• DC Current Gain (h_fe): 40 to 400
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The KSA643C is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, collector, and base leads. Suffix "C" means center collector in KSA643.
Here is an image showing the pin diagram of this transistor.The KSA643C transistor can have a current gain of 40 to 400. The gain of the KSA643CG will be in the range from 200 to 400, for the KSA643CO it will be in the range from 70 to 140, for the KSA643CR it will be in the range from 40 to 80, for the KSA643CY it will be in the range from 120 to 240.The complementary NPN transistor to the KSA643C is the KSD261C.You can replace the KSA643C with the MPS3638 or PN3638.