2N6549 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 40 V
• Collector-Base Voltage, max: 50 V
• Emitter-Base Voltage, max: 12 V
• Collector Current − Continuous, max: 2 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 25000 to 150000
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-202

Here is an image showing the pin diagram of this transistor.The BSP50 (SOT-223) and FMMT619 (SOT-23) is the SMD version of the 2N6549 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2N6549 with the 2N6548.