MMST3904 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: 0.2 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-323
• Electrically Similar to the Popular 2N3904 transistor

Here is an image showing the pin diagram of this transistor.The MMST3904 transistor is marked as "K2N".The complementary PNP transistor to the MMST3904 is the MMST3906.The 2N3904 is the TO-92 version of the MMST3904.You can replace the MMST3904 with the BC817W, FJX2222A, FJX3904, KTN2222AU, MMBT3904WT1, MMBT3904WT1G, MMST2222A, MMST4401, PMST3904 or PMST4401.