KSA642CO 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

The KSA642CO 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 KSA642O.
Here is an image showing the pin diagram of this transistor.The KSA642CO transistor can have a current gain of 70 to 140. The gain of the KSA642C will be in the range from 70 to 400, for the KSA642CG it will be in the range from 200 to 400, for the KSA642CY it will be in the range from 120 to 240.The MMBT4125 (SOT-23) is the SMD version of the KSA642CO transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the KSA642CO with the 2N3702, 2N3703, 2N4951, 2N4954, 2SA1020, 2SA1020O, 2SA1270, 2SA1270-O, 2SA1522, 2SA1523, 2SA1524, 2SA1525, 2SA1526, 2SA1527, 2SA1528, 2SA1529, 2SA200, 2SA200-O, 2SA562TM, 2SA562TM-O, 2SA984, 2SA993, 2SB598, 2SB764, BC636, KSB564AC, KSB564ACO, KSB810, KSB810-O, KSB811, KSB811-O, KTA1270, KTA1270O, KTA1281, KTA1281O, KTA200, KTA200-O, KTB764, MPS3638 or PN3638.