BSS138DW-7-F: Overview, Features, and Applications

The BSS138DW-7-F is an N-channel enhancement mode field-effect transistor (FET) manufactured by ON Semiconductor. It is designed for general-purpose low-power switching and amplification applications. Here’s an overview of its features and common applications:


  • Type: N-channel Enhancement Mode Field-Effect Transistor (FET)
  • Package: SOT-363
  • Manufacturer: ON Semiconductor



  1. Enhancement Mode: The BSS138DW-7-F 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 can be easily switched on with low gate-to-source voltage, making it suitable for low-power applications.

  3. Small Package: The SOT-363 package allows for compact surface-mount assemblies, making it ideal for space-constrained designs 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, particularly in RF applications.

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


  1. Signal Switching: The BSS138DW-7-F is commonly used for signal switching in various low-power digital and analog applications, especially in portable and battery-operated devices.

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

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

  4. Signal Amplification: In low-power and moderate-frequency applications, the BSS138DW-7-F can be used for signal amplification in various small-signal amplification circuits.

  5. Oscillator Circuits: The MOSFET can be utilized in oscillator and waveform generation circuits, particularly in low-power or portable electronic systems where power efficiency is crucial.

  6. DC-DC Converters: Due to its low threshold voltage and high-speed switching characteristics, it can be used in low-power DC-DC converter applications, including portable devices.

The BSS138DW-7-F MOSFET is widely used in various digital and analog circuits, particularly in portable and low-power electronics where space and power efficiency are critical.

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