Symbol

BSS138

N-channel MOSFET — 50V, 200mA, the I2C level-shifter MOSFET

⚡ Install this symbol

Paste this into Claude Code (VS Code panel, Adom editor, or terminal) to install:

Search the Adom Wiki for the symbol "BSS138" (slug: sym-bss138) at https://wiki-ufypy5dpx93o.adom.cloud/wiki/symbols/sym-bss138. Download the .kicad_sym file from the wiki page's static assets. Add it to my current KiCad project's symbols/ directory and register in sym-lib-table.
Category MOSFET
Library Transistor_FET
Symbol BSS138
Pins 3
Package SOT-23
Schematic Symbol

AI Skill Technical Reference

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BSS138

Symbol: BSS138 Library: Transistor_FET Category: MOSFET Pins: 3 Package: SOT-23

Description

The BSS138 is a small-signal N-channel MOSFET in SOT-23. Low threshold (0.8-1.5V) makes it perfect for 3.3V logic-level switching. Most commonly used as a bidirectional I2C/SPI level shifter (3.3V to 5V) with two resistors.

KiCad Library Reference

This symbol is from the official KiCad Transistor_FET library. Full identifier: Transistor_FET:BSS138

To use in your project:

  1. Open the Symbol Library Manager in KiCad
  2. Search for BSS138
  3. Place the symbol in your schematic

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0 revisions · KiCad Library: Transistor_FET:BSS138 · Updated 2026-03-02 17:31:36