BSS138-7-F: Overview, Features, and Applications

The BSS138-7-F is an N-channel enhancement mode field-effect transistor (FET) commonly used in electronic circuits. Here's an overview of its features and typical applications:


  • Type: N-Channel Enhancement Mode Field-Effect Transistor (FET)
  • Package: SOT-23
  • Manufacturer: ON Semiconductor


  1. Enhancement Mode: Operates in 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. Surface Mount Package: The SOT-23 package allows for easy integration into surface-mount assemblies, making it suitable for modern electronics manufacturing.

  4. Low Gate Input and Output Capacitance: These characteristics enable efficient integration into high-frequency applications by minimizing the capacitive loading.


  1. Signal Switching: Often used for signal switching, especially in low-power, battery-operated devices where efficient management of power is crucial.

  2. Voltage Level Shifting: Due to its low threshold voltage, it's commonly used for level-shifting applications where signals need to be shifted to different voltage levels, especially in interfacing digital signals between different voltage domains.

  3. Load Switching: Used as a switch to control power supply to various sub-circuits, particularly in battery-operated devices to improve energy efficiency and manage power distribution.

  4. Signal Amplification: In specific low-power and low-frequency applications, the BSS138-7-F can be used for signal amplification, capitalizing on its FET properties.

  5. Protection Circuits: Employed in protection circuits to safeguard other components by controlling the flow of current based on certain conditions, for example, in overvoltage protection circuits.

  6. Oscillator Circuits: It can be utilized in oscillator and waveform generation circuits, particularly in low-power or small-scale integrated systems where low power consumption is crucial.

The BSS138-7-F FET is widely used in digital and analog circuits due to its compact size, minimal control current requirements, and its ability to efficiently manage signal switching and level-shifting tasks within low-power and moderate-power electronics.

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