BSS138L: Overview, Features, and Applications

The BSS138L is a specific part number for a small-signal MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) that is commonly used for low voltage and low power applications. Here's an overview of its features and common applications:


The BSS138L is an N-channel enhancement-mode MOSFET designed for general-purpose switching applications. It offers low on-resistance and is capable of handling low voltage and current levels.



  1. MOSFET Configuration: The BSS138L is an N-channel MOSFET, which means it operates with a positive voltage on the gate relative to the source.

  2. Low Voltage Operation: It is designed for low voltage applications and can be driven with a voltage as low as 1.8V, making it suitable for battery-powered devices and low voltage circuits.

  3. Low On-Resistance: The MOSFET exhibits a low on-resistance (RDS(on)), which ensures minimal voltage drop across the transistor, allowing for efficient power switching with low power dissipation.

  4. Small Package: The BSS138L is available in small surface-mount packages such as SOT-23 and SOT-323, enabling compact circuit designs.

  5. Logic-Level Gate Drive: It is compatible with logic-level signals, allowing direct control from microcontrollers, digital circuits, and other integrated circuits operating at low voltage levels.


The BSS138L MOSFET is widely used in a variety of electronic circuits and applications, including:

  1. Switching Circuits: It is commonly employed in low voltage switching applications, such as load switching, power management, and electronic switches.

  2. Level Shifting: The BSS138L can be used for level shifting applications, translating voltage levels between different logic or signal levels.

  3. Signal Switching: It can be utilized to switch low-power analog or digital signals, such as in audio and video switching circuits or multiplexers.

  4. Battery-Powered Devices: Due to its low voltage operation and low power dissipation characteristics, the BSS138L is suitable for battery-powered devices, such as portable electronics and IoT devices.

  5. LED Drivers: It can serve as a driver for LED lighting applications, allowing efficient control and switching of LED currents.

  6. Load Control: The MOSFET can be used to control power to various loads, such as motors, solenoids, and relays, by acting as a switch in the control circuit.


It's important to consult the manufacturer's datasheet and guidelines for detailed specifications, specific circuit designs, and usage recommendations related to the BSS138L MOSFET for your particular application.

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