2SA642Y Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -25 V
• Collector-Base Voltage, max: -30 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.3 A
• Collector Dissipation: 0.4 W
• DC Current Gain (h_fe): 120 to 240
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The 2SA642Y 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.
Here is an image showing the pin diagram of this transistor.The 2SA642Y transistor can have a current gain of 120 to 240. The gain of the 2SA642 will be in the range from 70 to 400, for the 2SA642G it will be in the range from 200 to 400, for the 2SA642O it will be in the range from 70 to 140.Sometimes the "2S" prefix is not marked on the package - the 2SA642Y might only be marked "A642Y".The complementary NPN transistor to the 2SA642Y is the 2SD227Y.The KSA642Y is the TO-92 version of the 2SA642Y.You can replace the 2SA642Y with the 2N4403, 2SA696, 2SB564A, 2SB564AY, BCX79, KN2907, KSA642, KSA642Y, KSB564A, KSB564AY, KTC8550, KTC9012, KTN2907, M8550, MPS2907, MPS2907G, MPS3702, MPS6534, MPS6535, MPS6651, MPS6651G, MPS6652, MPS6652G, MPS750, MPS750G, MPS8550, MPSW51, MPSW51A, MPSW51AG, MPSW51G, PN200, PN2905, PN2907, S8550, S9012, SS8550, ZTX549, ZTX550 or ZTX949.