BSS138

{
  "schema_version": 1,
  "type": "component",
  "slug": "bss138-nmos",
  "title": "BSS138",
  "brief": "Diodes Inc N-channel logic-level MOSFET, SOT-23. 50 V, low Vgs(th), the I2C level-shift MOSFET. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "transistor",
    "mosfet",
    "n-channel",
    "logic-level",
    "level-shifter",
    "sot-23",
    "diodes-inc"
  ],
  "component": {
    "mpn": "BSS138",
    "manufacturer": "Diodes Incorporated",
    "package": "SOT-23",
    "pin_count": 3,
    "category": "Transistor",
    "subcategory": "N-channel logic-level MOSFET",
    "datasheet": "https://www.diodes.com/assets/Datasheets/BSS138.pdf",
    "parts": {
      "symbol": "bss138-nmos.kicad_sym",
      "footprint": "bss138-nmos.kicad_mod",
      "model_3d": "bss138-nmos-etched.glb",
      "model_3d_plain": "bss138-nmos.glb",
      "lbr": "bss138-nmos.lbr",
      "model_3d_step": "bss138-nmos-etched.step",
      "model_3d_step_plain": "bss138-nmos.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "G",
        "type": "input",
        "description": "Gate. Controls the MOSFET channel. VGS(TH) typ 1.2 V (0.5 V min, 1.5 V max). Continuous VGSS = ±20 V max. Input capacitance Ciss ≤ 50 pF @ VDS = 10 V."
      },
      {
        "number": "2",
        "name": "S",
        "type": "passive",
        "description": "Source. Reference terminal for VGS; connects to the internal body-diode anode. Continuous drain current ID = 200 mA (IDM pulsed = 1 A)."
      },
      {
        "number": "3",
        "name": "D",
        "type": "passive",
        "description": "Drain. Switched terminal; internal body-diode cathode. BVDSS = 50 V min, RDS(ON) typ 1.4 Ω (3.5 Ω max) @ VGS = 10 V, ID = 0.22 A."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.diodes.com/assets/Datasheets/BSS138.pdf",
        "pages": 6,
        "sha256": "c93dcb33f41424e6",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 3,
        "described": 3,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "bss138-nmos.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.5,
          3.0,
          1.2
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "dd5d1711204e1d8d26cd11490923bd84340820baa69538c385a4300ec2539bc0",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bss138-nmos-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          2.5,
          3.0,
          1.2
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "1cb233460bdd43e21e1bedf64bfa81f6a390621eca6e241af98e79478164e484",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "N-channel MOSFET (logic-level)",
      "Drain-source (VDS)": "50 V",
      "Gate threshold (Vgs(th))": "0.8-1.5 V",
      "Continuous drain current": "~200 mA",
      "RDS(on)": "~3.5 Ω at VGS=10 V",
      "Common use": "I2C / logic level shifting",
      "Pinout": "G-S-D",
      "Package": "SOT-23"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "bss138",
    "logic level mosfet",
    "i2c level shifter",
    "n-channel sot-23",
    "level shift mosfet"
  ],
  "discovery_pitch": "BSS138 N-channel logic-level MOSFET (SOT-23) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "bss138-nmos.kicad_sym",
    "bss138-nmos.kicad_mod",
    "bss138-nmos.glb",
    "bss138-nmos.lbr",
    "docs/hero.png",
    "docs/bss138-nmos-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bss138-nmos-etched.step"
  ],
  "variants": [
    {
      "mpn": "BSS138-7-F (SOT-23)",
      "kind": "packaging"
    },
    {
      "mpn": "BSS138W-7-F (SOT-323)",
      "kind": "packaging"
    }
  ]
}