BSS138W-7-F: Overview, Features, and Applications

The BSS138W-7-F is a small signal N-channel MOSFET designed for general-purpose switching and amplification applications. Manufactured by ON Semiconductor, it comes in a SOT-323 surface-mount package. Below is an overview of its features and common applications:


  • Type: N-channel MOSFET
  • Package: SOT-323
  • Manufacturer: ON Semiconductor



  1. Enhancement Mode: The BSS138W-7-F operates in the enhancement mode, meaning it requires a positive voltage at the gate with respect to the source to allow current flow between the drain and source terminals.

  2. Low Threshold Voltage: With a low threshold voltage, it can be easily switched on with low gate-to-source voltage, making it suitable for low-power applications.

  3. Small Package: The SOT-323 package allows for compact surface-mount assemblies, making it ideal for small and portable electronic devices.

  4. Low Input and Output Capacitance: This feature allows for efficient integration into high-frequency applications and minimizes the capacitive loading of driving circuits.

  5. High Speed Switching: The MOSFET features fast switching characteristics, making it suitable for high-speed applications.


  1. Signal Switching: The BSS138W-7-F is commonly used for signal switching applications in various electronics, particularly in low-power and portable devices where space and power efficiency are crucial.

  2. Level Shifting: Due to its low threshold voltage, it is suitable for level-shifting applications, facilitating interfacing between different voltage domains.

  3. Load Switching: It is used as a switch to control power supply to various sub-circuits, especially in battery-operated and portable devices, aiding in efficient power management.

  4. Signal Amplification: In low-power and moderate-frequency applications, the BSS138W-7-F can be used for signal amplification, leveraging its MOSFET properties.

  5. Oscillator Circuits: The MOSFET can be utilized in oscillator and waveform generation circuits, particularly in low-power or small-scale integrated systems.

  6. Voltage Regulation: In low-power applications, it can be employed in voltage regulator circuits, especially where low threshold voltage and small form factor are advantageous.

The BSS138W-7-F MOSFET is widely used in various digital and analog circuits, especially in portable devices, and applications where space and power efficiency are critical.

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