MMBT3904-7-F Diodes TRANS NPN 40V 0.2A SMD SOT23-3


The MMBT3904-7-F is an NPN bipolar junction transistor (BJT) manufactured by Diodes Incorporated. Here is a detailed introduction to the MMBT3904-7-F transistor:



  • Manufacturer: Diodes Incorporated
  • Part Number: MMBT3904-7-F
  • Type: NPN Bipolar Junction Transistor (BJT)
  • Package: SOT-23-3 (Small Outline Transistor Package with 3 Leads)

Key Specifications:

  • Type: NPN transistor (Negative-Positive-Negative configuration)
  • Voltage Rating (V<sub>ce</sub>): 40V (Collector-Emitter Voltage)
  • Current Rating (I<sub>c</sub>): 0.2A (Continuous Collector Current)
  • Package Type: SOT-23-3 package with three leads
  • H<sub>fe</sub> (Forward Current Gain): Typically ranging from 100 to 300
  • Transition Frequency (f<sub>T</sub>): Typically around 250MHz
  • Power Dissipation (P<sub>d</sub>): Up to 350mW
  • DataSheet

    MMBT3904-7-F PDF

Features and Applications:

  • NPN BJT: Consists of a layer of p-doped semiconductor between two n-doped layers.
  • Voltage and Current Ratings: Rated for a maximum collector-emitter voltage of 40V and a continuous collector current of 200mA.
  • Package Type: SOT-23-3 is a surface-mount package that enables easy mounting on PCBs.
  • High Frequency Operation: With a transition frequency of around 250MHz for high-frequency applications.
  • Power Dissipation: Capable of dissipating up to 350mW of power.
  • Switching Speed: Offers fast switching times for efficient performance in switching applications.

Package Information:

  • SOT-23-3 Package: Small and surface-mountable, suitable for compact PCB layouts and automated assembly processes.


  • Amplification: Commonly used in amplifier circuits due to its high gain characteristics.
  • Switching Applications: Suitable for various switching applications in electronics.
  • Voltage Amplification: Utilized to amplify voltage signals in different electronic circuits.
  • Oscillator Circuits: Can be used in oscillator circuits for waveform generation.
  • Signal Processing: Helpful in signal processing applications within electronic systems.


  • High Gain: Provides considerable forward current gain for amplification purposes.
  • Fast Switching: Enables quick switching transitions for efficient circuit operations.
  • Versatile Use: Suitable for a broad range of applications in electronics.
  • Compact Form Factor: The SOT-23-3 package is space-efficient and compatible with SMT manufacturing processes.

The MMBT3904-7-F NPN transistor from Diodes Incorporated is a versatile component suitable for various amplification and switching applications in electronic circuits. With high gain, fast switching times, and a compact SOT-23-3 package, it is a valuable component for space-constrained designs requiring efficient amplification and switching capabilities.