MMBT6428 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 50 V
• Collector-Base Voltage, max: 60 V
• Collector Current − Continuous, max: 0.5 A
• Collector Dissipation: 0.35 W
• DC Current Gain (h_fe): 250 to 650
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: SOT-23

Here is an image showing the pin diagram of this transistor.You can replace the MMBT6428 with the 2SC3912, 2SC3913, 2SC3914, 2SC3915, FMMT619, FMMT620, FMMTA05, FMMTA06, KST05, KST06, MMBTA05, MMBTA06, PMBTA06, SMBTA05 or SMBTA06.