LM331AN

{
  "schema_version": 1,
  "type": "component",
  "slug": "lm331an",
  "title": "LM331AN",
  "brief": "Texas Instruments V/F And F/V Converters, PDIP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "data acquisition",
    "lm331an",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "LM331AN",
    "manufacturer": "Texas Instruments",
    "package": "PDIP-8",
    "pin_count": 8,
    "category": "Data Acquisition",
    "subcategory": "V/F And F/V Converters",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm231",
    "parts": {
      "symbol": "lm331an.kicad_sym",
      "footprint": "lm331an.kicad_mod",
      "model_3d": "lm331an-hero.glb",
      "model_3d_plain": "lm331an.glb",
      "model_3d_step": "lm331an-etched.step",
      "model_3d_step_plain": "lm331an.step",
      "lbr": "lm331an.lbr"
    },
    "distributor_links": {
      "lcsc": "C1519434",
      "digikey": "LM331AN-ND",
      "mouser": "926-LM331AN"
    },
    "distributor_check": {
      "checked_at": "2026-10-08T13:56:20Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "LM331AN-ND",
        "status": "found",
        "lifecycle": "Obsolete"
      },
      "mouser": {
        "pn": "926-LM331AN",
        "status": "found",
        "lifecycle": "Obsolete"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "IOUT",
        "type": "output",
        "description": "Current output of the switched current source, which supplies i = 1.90 V/RS to the timing network and is specified at 116 to 156 µA for LM331AN at RS = 14 kΩ with pin 1 at 0 V (136 µA typical)."
      },
      {
        "number": "2",
        "name": "IREF",
        "type": "input",
        "description": "Reference current input where the internal band-gap regulates the pin voltage to about 1.9 V (1.7 to 2.08 V for LM331) and the set resistor RS defines the current, with an operating range of 10 to 500 µA."
      },
      {
        "number": "3",
        "name": "FOUT",
        "type": "output",
        "description": "Frequency output that is an open-collector output requiring a pullup resistor, with a saturation voltage of 0.5 V maximum at 5 mA and an OFF leakage of 1 µA maximum."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device; all voltages are measured with respect to GND = 0 V."
      },
      {
        "number": "5",
        "name": "RC",
        "type": "input",
        "description": "R-C filter input connected to the external RtCt timing network, where the timer threshold is 0.63 to 0.7 × VS (0.667 × VS typical) and the reset saturation voltage is 0.5 V maximum at 5 mA."
      },
      {
        "number": "6",
        "name": "THRESH",
        "type": "input",
        "description": "Threshold input to the input comparator, which compares it against COMPIN (pin 7), with a common-mode range of −0.2 V to VCC − 2 V and offset voltage of ±10 mV maximum for LM331 (±14 mV over temperature)."
      },
      {
        "number": "7",
        "name": "COMPIN",
        "type": "input",
        "description": "Comparator input for the signal voltage VIN, which the input comparator compares against THRESH (pin 6), with a bias current of −300 nA maximum and an offset current of ±100 nA maximum."
      },
      {
        "number": "8",
        "name": "VS",
        "type": "power_in",
        "description": "Supply voltage, specified over 4 V to 40 V with an absolute maximum of 40 V."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Package and part mapping: LM331AN is listed in the orderable addendum (page 20) as LM331AN/NOPB and ; Page 18 contains a garbled pin label list (COMP-OUT, RC_TIME, LOAD, VINF, GND) that does not match t; Pin 5 is named 'RC' in the page 4 table, described there as 'R-C filter input', while the functional"
        ],
        "pages_sent": 24,
        "cost_usd": 0.0799,
        "at": "2026-10-08T13:56:06"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm231",
        "pages": 24,
        "sha256": "a5847f55707c2947",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "lm331an.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          9.27,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "4a377a56a8d9e9c0b86c095ef9ecc1869ac19e7f5069a3247b294250bf4f235d",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lm331an-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          7.874,
          9.27,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "c0c000fe60ec2ac4c95a0c5c604397b9f83f763b5ccf6f9fdf83d28009694413",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "PDIP-8",
      "Category": "Data Acquisition",
      "Pins": "8"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "lm331an"
  ],
  "discovery_pitch": "LM331AN (Texas Instruments) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lm331an.kicad_sym",
    "lm331an.kicad_mod",
    "lm331an.glb",
    "lm331an.step",
    "lm331an.lbr",
    "docs/hero.png",
    "docs/lm331an-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lm331an-hero.glb",
    "lm331an-hero.overlay.json"
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  "visibility": {
    "public": true
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}