KSA643CY 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

The KSA643CY 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 KSA643Y.
Here is an image showing the pin diagram of this transistor.The KSA643CY transistor can have a current gain of 120 to 240. The gain of the KSA643C will be in the range from 40 to 400, for the KSA643CG it 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.The complementary NPN transistor to the KSA643CY is the KSD261CY.You can replace the KSA643CY with the 2N3702, 2N4952, 2N4954, 2SA1150, 2SA1270, 2SA1270-Y, 2SA1271, 2SA1273, 2SA1296, 2SA1296-Y, 2SA1534, 2SA1534-R, 2SA1619, 2SA1619-R, 2SA562TM, 2SA562TM-Y, 2SA683, 2SA683-R, 2SA719, 2SA719-R, 2SA928A, 2SA950, 2SA952, 2SA966, 2SB561, 2SB561-C, 2SB562, 2SB562-C, 2SB564, 2SB598, 2SB621, 2SB621-R, 2SB621A, 2SB621A-R, 2SB698, KSA928A, KSB564AC, KSB564ACY, KSB810, KSB810-Y, KSB811, KSB811-Y, KTA1270, KTA1270Y, KTA1271, KTA1272, KTA1273, KTA1282, KTA1283, KTA1296, KTA1296-Y, MPS3638, MPS3638A, PN3638, PN3638A or STB1277.