KSA643Y 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): 120 to 240
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92
• Electrically Similar to the Popular 2SA643Y transistor

The KSA643Y 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 KSA643CY transistor (with suffix "C") is the center collector version of the KSA643Y.
Here is an image showing the pin diagram of this transistor.The KSA643Y transistor can have a current gain of 120 to 240. 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 KSA643R it will be in the range from 40 to 80.The complementary NPN transistor to the KSA643Y is the KSD261Y.The 2SA643Y is the TO-92 version of the KSA643Y.You can replace the KSA643Y with the 2N4403, 2SA643, 2SA643Y, 2SA695, 2SB564A, 2SB564AY, KN2907, KSB564A, KSB564AY, KTC8550, KTC9012, KTN2907, M8550, MPS2907, MPS2907G, MPS3702, MPS6534, MPS6535, MPS6651, MPS6651G, MPS6652, MPS6652G, MPS750, MPS750G, MPS8550, MPSW51, MPSW51A, MPSW51AG, MPSW51G, PN2905, PN2907, S8550, S9012, SS8550, ZTX549, ZTX948 or ZTX949.