BSS138 J1 220mA 50V SOT-23 SMD N-Channel MOSFET

The BSS138 J1 220mA 50V SOT-23 SMD N-Channel MOSFET is a compact surface-mount transistor designed for low-current switching and level-shifting tasks in space-constrained circuit designs. With an N-channel topology and a 50V maximum rating, this device is suitable for many low-voltage logic interfacing and general-purpose switching applications where a small footprint and SMD assembly are required.

Packaged in a SOT-23 case, the BSS138 J1 offers a standard three-lead layout that simplifies PCB layout and automated assembly. Its modest 220mA current capability makes it appropriate for signal switching, pull-down or pull-up functions, and driving small loads or gates in battery-powered and portable electronics. The small package helps conserve board area and supports high-density designs.

Designers will appreciate the MOSFET’s suitability for level translation between different logic-voltage domains and for use in reference switching or protection circuits. Standard SMD handling and reflow soldering processes apply; typical pick-and-place equipment and infrared or convection reflow profiles used for SOT-23 parts are compatible. When integrating the BSS138 J1, verify circuit thermal and current requirements to ensure reliable operation within the specified 220mA and 50V limits.

Because the device is provided in an industry-standard SOT-23 package, replacements and footprint reuse are straightforward during design iterations and repairs. Evaluate gate drive conditions and any required gate resistors or pull components when incorporating the MOSFET into switching or interfacing circuits to achieve the desired speed and noise characteristics.