BSS138W ON Semiconductor MOSFET N-CH 50V 210MA SC70


The BSS138W is an N-channel MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) manufactured by ON Semiconductor. Below is a detailed introduction to the BSS138W MOSFET:



  • Manufacturer: ON Semiconductor
  • Part Number: BSS138W
  • Type: N-Channel MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor)
  • Package: SC70 (Small-Outline Transistor with 2 or 3 Leads)

Key Specifications:

  • Voltage Rating (V<sub>ds</sub>): 50V (Maximum Drain-Source Voltage)
  • Current Rating (I<sub>d</sub>): 210mA (Continuous Drain Current)
  • Package Type: SC70, a small surface-mount package
  • Threshold Voltage (V<sub>th</sub>): Typically around 1V - 3V
  • Low On-Resistance (R<sub>ds(on)</sub>): Efficient conduction in the ON state
  • DataSheet

    BSS138W PDF

Features and Applications:

  • N-Channel MOSFET: Suitable for low-power switching applications.
  • Voltage and Current Ratings: Designed for applications requiring a 50V V<sub>ds</sub> and 210mA I<sub>d</sub>.
  • Package Type: SC70 package, compact and suitable for space-constrained designs.
  • Low Threshold Voltage: Enables efficient switching with low gate voltage.
  • Enhancement Mode: Normally-off transistor that requires a positive gate voltage for conduction.

Package Information:

  • SC70 Package: A small, surface-mount package suitable for compact electronic designs.


  • Switching Circuits: Ideal for low-power switching applications.
  • Signal Routing: Commonly used for signal routing and switching applications.
  • Voltage Regulation: Applicable in circuits requiring voltage regulation.
  • Battery Management: Utilized in battery management systems for power control.
  • Load Switching: Efficient for controlling power to loads in various applications.


  • Low Power Consumption: Ideal for energy-efficient circuits.
  • Space-Efficient Design: Compact SC70 package saves board space.
  • Fast Switching Speed: Ensures quick response in switching operations.
  • Versatile Usage: Applicable in a variety of low-power electronic applications.

The ON Semiconductor BSS138W MOSFET is designed for low-power switching applications, offering a 50V maximum drain-source voltage, 210mA continuous drain current, and housed in a compact SC70 package. With its efficient switching characteristics and space-saving design, it is suitable for various electronic circuits that demand reliable and efficient performance in a compact form factor.