MMBT3904T Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 40 V
• Collector-Base Voltage, max: 60 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 0.2 A
• Collector Dissipation: 0.25 W
• DC Current Gain (h_fe): 100 to 300
• Transition Frequency, min: 300 MHz
• Noise Figure, max: 5 dB
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: SOT-523F

Here is an image showing the pin diagram of this transistor.The MMBT3904T transistor is marked as "A04".The complementary PNP transistor to the MMBT3904T is the MMBT3906T.You can replace the MMBT3904T with the MMBT2222AT.