KSA643 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
• Electrically Similar to the Popular 2SA643 transistor

The KSA643 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, base, and collector leads. The KSA643C transistor (with suffix "C") is the center collector version of the KSA643.
Here is an image showing the pin diagram of this transistor.The KSA643 transistor can have a current gain of 40 to 400. The gain of the KSA643G will be in the range from 200 to 400, for the KSA643O it will be in the range from 70 to 140, for the KSA643R it will be in the range from 40 to 80, for the KSA643Y it will be in the range from 120 to 240.The complementary NPN transistor to the KSA643 is the KSD261.The 2SA643 is the TO-92 version of the KSA643.You can replace the KSA643 with the 2SA643 or MPS6535.