2N3635 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -140 V
• Collector-Base Voltage, max: -140 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -1 A
• Collector Dissipation: 5 W
• DC Current Gain (h_fe): 100 to 300
• Noise Figure, max: 5 dB
• Operating and Storage Junction Temperature Range: -65 to +200 °C
• Package: TO-39

Here is an image showing the pin diagram of this transistor.The FMMT555 (SOT-23) is the SMD version of the 2N3635 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2N3635 with the 2N3637.