BSS138W: Overview, Features, and Applications

The BSS138W is an N-channel enhancement mode field-effect transistor (FET) designed for low voltage, low current, and moderate speed switching applications. Below is an overview of its features and typical applications:


  • Type: N-channel Enhancement Mode Field-Effect Transistor (FET)
  • Package: SOT-323
  • Manufacturer: Multiple manufacturers, including ON Semiconductor, Infineon, and others



  1. Enhancement Mode: Operates in the enhancement mode, meaning it requires a positive voltage on the gate relative to the source to allow current flow between the drain and source terminals.

  2. Low Threshold Voltage: With a low threshold voltage, it's easily switched on with low gate-to-source voltage, fitting well for low-power applications.

  3. Small Package: The compact SOT-323 package allows for easy integration in space-constrained environments and is suitable for 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 FET features fast switching characteristics, making it suitable for high-speed applications.


  1. Signal Switching: Commonly used for signal switching applications in various electronic systems due to its low power operation and compact size.

  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: 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 can be used for signal amplification, leveraging its FET properties.

  5. Oscillator Circuits: Utilized in oscillator and waveform generation circuits, particularly in low-power or small-scale integrated systems where efficient power utilization is crucial.

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

The BSS138W FET is widely used in various digital and analog circuits, particularly in portable devices, and applications where space and power efficiency are critical.

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