KSA643R 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 80
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92
• Electrically Similar to the Popular 2SA643R transistor

The KSA643R 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 KSA643CR transistor (with suffix "C") is the center collector version of the KSA643R.
Here is an image showing the pin diagram of this transistor.The KSA643R transistor can have a current gain of 40 to 80. The gain of the KSA643 will be in the range from 40 to 400, for the KSA643G it will be in the range from 200 to 400, for the KSA643O it will be in the range from 70 to 140, for the KSA643Y it will be in the range from 120 to 240.The 2SA643R is the TO-92 version of the KSA643R.You can replace the KSA643R with the 2SA643, 2SA643R, MPS6533, MPS6535, PN2904 or PN2906.