KSA643O 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): 70 to 140
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92
• Electrically Similar to the Popular 2SA643O transistor

The KSA643O 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 KSA643CO transistor (with suffix "C") is the center collector version of the KSA643O.
Here is an image showing the pin diagram of this transistor.The KSA643O transistor can have a current gain of 70 to 140. 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 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 2SA643O is the TO-92 version of the KSA643O.You can replace the KSA643O with the 2N4402, 2SA643, 2SA643O, 2SA695, 2SB564A, 2SB564AO, KSB564A, KSB564AO, KTC9012, MPS3702, MPS6535, MPS6562, MPS6563, MPS6651, MPS6651G, MPS6652, MPS6652G, MPSW51, MPSW51A, MPSW51AG, MPSW51G, S9012 or SS9012.