KSA642O 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): 70 to 140
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92
• Electrically Similar to the Popular 2SA642O transistor

The KSA642O 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 KSA642CO transistor (with suffix "C") is the center collector version of the KSA642O.
Here is an image showing the pin diagram of this transistor.The KSA642O transistor can have a current gain of 70 to 140. The gain of the KSA642 will be in the range from 70 to 400, for the KSA642G it will be in the range from 200 to 400, for the KSA642Y it will be in the range from 120 to 240.The complementary NPN transistor to the KSA642O is the KSD227O.The MMBT4125 (SOT-23) is the SMD version of the KSA642O transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.The 2SA642O is the TO-92 version of the KSA642O.You can replace the KSA642O with the 2N4402, 2SA642, 2SA642O, 2SA696, 2SB564A, 2SB564AO, KSB564A, KSB564AO, KTC9012, MPS3702, MPS6535, MPS6562, MPS6651, MPS6651G, MPS6652, MPS6652G, MPSW51, MPSW51A, MPSW51AG, MPSW51G or S9012.