ACS712

{
  "schema_version": 1,
  "type": "component",
  "slug": "acs712",
  "title": "ACS712",
  "brief": "Allegro Hall-effect linear current sensor, SOIC-8. Fully isolated 1.2 mohm path, analog output, ±5/20/30 A. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "sensor",
    "current-sensor",
    "hall-effect",
    "isolated",
    "soic-8",
    "allegro"
  ],
  "component": {
    "mpn": "ACS712",
    "manufacturer": "Allegro MicroSystems",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Sensor",
    "subcategory": "Hall-effect current sensor",
    "datasheet": "https://www.allegromicro.com/-/media/files/datasheets/acs712-datasheet.ashx",
    "parts": {
      "symbol": "acs712.kicad_sym",
      "footprint": "acs712.kicad_mod",
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      "model_3d_plain": "acs712.glb",
      "lbr": "acs712.lbr",
      "model_3d_step": "acs712-etched.step",
      "model_3d_step_plain": "acs712.step"
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "IP+",
        "type": "passive",
        "description": "Primary current input terminal (positive). Terminals for current being sampled; fused internally. Pins 1 and 2 are tied together to carry the sensed current into the on-die copper conduction path."
      },
      {
        "number": "2",
        "name": "IP+",
        "type": "passive",
        "description": "Primary current input terminal (positive). Terminals for current being sampled; fused internally. Pins 1 and 2 are tied together to carry the sensed current into the on-die copper conduction path."
      },
      {
        "number": "3",
        "name": "IP-",
        "type": "passive",
        "description": "Primary current output terminal (negative/return). Terminals for current being sampled; fused internally. Pins 3 and 4 are tied together to carry the sensed current out of the on-die copper conduction path."
      },
      {
        "number": "4",
        "name": "IP-",
        "type": "passive",
        "description": "Primary current output terminal (negative/return). Terminals for current being sampled; fused internally. Pins 3 and 4 are tied together to carry the sensed current out of the on-die copper conduction path."
      },
      {
        "number": "5",
        "name": "GND",
        "type": "power_in",
        "description": "Signal ground terminal. Reference ground for VCC and VIOUT on the signal side of the isolation barrier."
      },
      {
        "number": "6",
        "name": "FILTER",
        "type": "passive",
        "description": "Terminal for external capacitor (CF) that sets output bandwidth. Forms an RC filter with the internal RF(INT) ≈ 1.7 kΩ. Typical value is 1 nF for the default 80 kHz bandwidth."
      },
      {
        "number": "7",
        "name": "VIOUT",
        "type": "output",
        "description": "Analog output signal. Voltage proportional to the sensed primary current IP, with a quiescent (zero-current) output of VCC × 0.5 (bidirectional variants). Sensitivity ranges from 66 to 185 mV/A depending on the current-range variant."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Device power supply terminal. 5.0 V nominal (4.5 V min / 5.5 V max). Typical supply current ICC ≈ 10 mA. Decouple with 0.1 µF to GND close to the pin."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.allegromicro.com/-/media/files/datasheets/acs712-datasheet.ashx",
        "pages": 16,
        "sha256": "21b345f7a98d3694",
        "source_tier": "mfr"
      },
      "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": [
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "acs712-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
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        "sha256": "0dab71fdd2c88a8903d528153050a1e77f443bca9c1caac8625a820734b6e37c",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "Hall-effect linear current sensor",
      "Sensing": "galvanically isolated (2.1 kV)",
      "Conductor resistance": "1.2 mΩ",
      "Output": "analog, 2.5 V at 0 A (ratiometric)",
      "Ranges": "±5 A / ±20 A / ±30 A",
      "Sensitivity": "185 / 100 / 66 mV/A",
      "Supply voltage": "5 V",
      "Package": "SOIC-8"
    }
  },
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "acs712",
    "current sensor",
    "hall effect current",
    "isolated current sensing"
  ],
  "discovery_pitch": "ACS712 Hall-effect linear current sensor (SOIC-8, galvanically isolated) 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": [
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}