PN3645 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -60 V
• Collector-Base Voltage, max: -60 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.5 A
• Collector Dissipation: 0.625 W
• DC Current Gain (h_fe): 80 to 240
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92
• Electrically Similar to the Popular 2N3645 transistor

The PN3645 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.
Here is an image showing the pin diagram of this transistor.The FMMTA55 (SOT-23) and KST55 (SOT-23) is the SMD version of the PN3645 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the PN3645 with the 2SA1283, 2SA1284, 2SA1315, 2SA965, 2SA984K, 2SB560, 2SB647, KSA708C, KSA916, KSA931, KTA1023, KTA1023-O or KTA1023-Y.