2N3725A Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 50 V
• Collector-Base Voltage, max: 80 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 1.2 A
• Collector Dissipation: 5 W
• DC Current Gain (h_fe): 60 to 150
• Transition Frequency, min: 300 MHz
• 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 FMMT451 (SOT-23) is the SMD version of the 2N3725A transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2N3725A with the 2N3725, 2N5320, 2N5321, 2N5334, 2N5335, 2N5337, 2N5339, 2SC510, 2SC510-O, 2SC512 or 2SC512-O.