A4949GLJTR-T

{
  "slug": "a4949gljtr-t",
  "version": "0.1.0",
  "type": "component",
  "description": "Allegro MicroSystems LLC Brushless DC (BLDC) Motor Driver, SOIC-8-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "motor driver ics",
    "a4949gljtr-t",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "a4949gljtr-t.kicad_sym",
    "a4949gljtr-t.kicad_mod",
    "a4949gljtr-t.glb",
    "a4949gljtr-t.step",
    "a4949gljtr-t.lbr",
    "docs/hero.png",
    "docs/a4949gljtr-t-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "a4949gljtr-t-hero.glb",
    "a4949gljtr-t-hero.overlay.json",
    "a4949gljtr-t-etched.glb"
  ],
  "component": {
    "mpn": "A4949GLJTR-T",
    "manufacturer": "Allegro MicroSystems LLC",
    "package": "SOIC-8-EP",
    "pin_count": 9,
    "category": "Motor Driver ICs",
    "subcategory": "Brushless DC (BLDC) Motor Driver",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588914376815992832",
    "parts": {
      "symbol": "a4949gljtr-t.kicad_sym",
      "footprint": "a4949gljtr-t.kicad_mod",
      "model_3d": "a4949gljtr-t-hero.glb",
      "model_3d_plain": "a4949gljtr-t-etched.glb",
      "model_3d_step": "a4949gljtr-t-etched.step",
      "model_3d_step_plain": "a4949gljtr-t.step",
      "lbr": "a4949gljtr-t.lbr"
    },
    "distributor_links": {
      "lcsc": "C545186",
      "digikey": "A4949GLJTR-T-ND",
      "mouser": "250-A4949GLJTR-T"
    },
    "distributor_check": {
      "checked_at": "2026-10-21T01:02:13Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "A4949GLJTR-T-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "250-A4949GLJTR-T",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device; the datasheet gives no electrical limit for this pin."
      },
      {
        "number": "2",
        "name": "OUTA",
        "type": "output",
        "description": "Motor phase A terminal driven by the sinusoidal gate drive, with total driver RDS(on) of 1.1 Ω typical at VBB = 12 V and overcurrent limiting (IOCL) of 1.4 to 1.8 A."
      },
      {
        "number": "3",
        "name": "VBB",
        "type": "power_in",
        "description": "Input supply, specified for 4 to 18 V with an absolute maximum rating of 18 V and undervoltage lockout at 3.85 to 3.98 V on a rising supply."
      },
      {
        "number": "4",
        "name": "PWM",
        "type": "input",
        "description": "PWM speed input on the A4949 (VSP on the A4945), with logic high of 2 V to 5.5 V, logic low of 0 to 0.8 V, an absolute maximum of -0.3 to 6 V, an internal 100 kΩ pulldown, and a PWM frequency range of 0.1 to 100 kHz."
      },
      {
        "number": "5",
        "name": "VREF",
        "type": "power_in",
        "description": "Analog reference output at 3.2 to 3.4 V that requires a 0.1 µF X5R 10 V ceramic capacitor (CVREF) as stated in the application circuit."
      },
      {
        "number": "6",
        "name": "FG",
        "type": "output",
        "description": "Open-drain speed output signal that changes state once per electrical motor revolution, with a 14 V maximum voltage, 10 mA maximum current, and 0.3 V maximum saturation voltage at 5 mA."
      },
      {
        "number": "7",
        "name": "OUTC",
        "type": "output",
        "description": "Motor phase C terminal driven by the sinusoidal gate drive, with total driver RDS(on) of 1.1 Ω typical at VBB = 12 V and overcurrent limiting (IOCL) of 1.4 to 1.8 A."
      },
      {
        "number": "8",
        "name": "OUTB",
        "type": "output",
        "description": "Motor phase B terminal driven by the sinusoidal gate drive, with total driver RDS(on) of 1.1 Ω typical at VBB = 12 V and overcurrent limiting (IOCL) of 1.4 to 1.8 A."
      },
      {
        "number": "9",
        "name": "PAD",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "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: The datasheet names the exposed pad as a thermal pad and says to connect it to ground planes, but do; The pinout table covers both A4945 and A4949. Pin 4 is PWM for the A4949 (the MPN here), and the VSP; The datasheet calls OUTA, OUTB and OUTC 'Motor terminal' without an electrical class. The type 'outp",
          "exposed pad 9 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint"
        ],
        "pages_sent": 12,
        "cost_usd": 0.0515,
        "at": "2026-10-21T00:59:43"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588914376815992832",
        "pages": 12,
        "sha256": "4b7c7efcaf5bd8b1",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 9,
        "described": 9,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "a4949gljtr-t.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.55
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "2d6f7e774e8143e3320cbd59eb5be9f3b7864614644e3b072006e1eb05fb7fa6",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "a4949gljtr-t-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          4.9,
          1.55
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "c243a43a26f50dfc1f1a37d9cdac0c5d8a2a3c76d5cc291a63704240001583d4",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}