2N6551 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 60 V
• Collector-Base Voltage, max: 60 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 80 to 300
• Transition Frequency, min: 375 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 complementary PNP transistor to the 2N6551 is the 2N6554.The 2SC3444 (SOT-89), FMMTA05 (SOT-23) and KST05 (SOT-23) is the SMD version of the 2N6551 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2N6551 with the 2N6552 or 2N6553.