A4949GLJTR-T

{
  "schema_version": 1,
  "type": "component",
  "slug": "a4949gljtr-t",
  "title": "A4949GLJTR-T",
  "brief": "Allegro MicroSystems LLC Brushless DC (BLDC) Motor Driver, SOIC-8-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "motor driver ics",
    "a4949gljtr-t",
    "factory-2.0.0",
    "extractor-text"
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  "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"
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        "sha256": "4b7c7efcaf5bd8b1",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 9,
        "described": 9,
        "cites_pages": true,
        "refuses_to_fabricate": true
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        "zmin_mm": 0,
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        "sha256": "2d6f7e774e8143e3320cbd59eb5be9f3b7864614644e3b072006e1eb05fb7fa6",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Allegro MicroSystems LLC",
      "Package": "SOIC-8-EP",
      "Category": "Motor Driver ICs",
      "Pins": "9"
    },
    "appearance": {
      "contacts": {
        "quote": "for wave solder applications. Both packages are lead (Pb) free with 100% matte-tin leadframe plating.",
        "page": 1,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
      "datasheet_sha256": "4b7c7efcaf5bd8b1c85396b5f80294830c963e4a37ec45d8a924e32c9db5c800"
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    "characteristics": {
      "version": 1,
      "source": "datasheet",
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      "rows": [
        {
          "name": "Recommended supply voltage VBB (G version valid range)",
          "symbol": "VBB",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 4,
          "typ": null,
          "max": 18,
          "conditions": "G version; electrical characteristics header",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Supply Voltage",
          "symbol": "VBB",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 18,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Input Logic Voltage Range",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 6,
          "conditions": "PWM and VSP pins",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Logic Output (FG pin)",
          "symbol": "VFG",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 14,
          "conditions": "FG pin",
          "source_page": 2,
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        },
        {
          "name": "Logic Output Current (FG pin)",
          "symbol": "IFG",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "FG pin",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Operating Ambient Temperature",
          "symbol": "TA",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 105,
          "conditions": "G temperature range",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Maximum Junction Temperature",
          "symbol": "TJ(max)",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
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        },
        {
          "name": "Storage Temperature",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "VBB Supply Current",
          "symbol": "IBB",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 10,
          "max": 15,
          "conditions": "VIN = 3 V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Total Driver RDS(on) (Sink + Source)",
          "symbol": "RDS(on)",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": 1.1,
          "max": 1.4,
          "conditions": "IOUT = 1 A, TJ = 25°C, VBB = 12 V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Total Driver RDS(on) (Sink + Source)",
          "symbol": "RDS(on)",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": 1.5,
          "max": 1.8,
          "conditions": "IOUT = 1 A, TJ = 25°C, VBB = 4 V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Reference Voltage (VREF pin)",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 3.2,
          "typ": 3.3,
          "max": 3.4,
          "conditions": "IFG = 5 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output Saturation Voltage (FG Pin)",
          "symbol": "VFG(sat)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.3,
          "conditions": "IFG = 5 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "FG Output Leakage",
          "symbol": "IFG(LKG)",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "VFG = 14 V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Motor PWM Frequency",
          "symbol": "fOUTPWM",
          "kind": "electrical",
          "unit": "kHz",
          "min": 28,
          "typ": 30,
          "max": 32,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input Current",
          "symbol": "IIN",
          "kind": "electrical",
          "unit": "µA",
          "min": 21,
          "typ": 33,
          "max": 45,
          "conditions": "VIN = 3 V (RIN = 100 kΩ pulldown)",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Logic Input (Low Level)",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": 0.8,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Logic Input (High Level)",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Logic Input Hysteresis",
          "symbol": "VIHYS",
          "kind": "electrical",
          "unit": "mV",
          "min": 200,
          "typ": 300,
          "max": 600,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "PWM On Threshold",
          "symbol": "DON",
          "kind": "electrical",
          "unit": "%",
          "min": 9.5,
          "typ": 10,
          "max": 10.5,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "PWM Off Threshold",
          "symbol": "DOFF",
          "kind": "electrical",
          "unit": "%",
          "min": 7,
          "typ": 7.5,
          "max": 8,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "PWM Input Frequency Range",
          "symbol": "fPWM",
          "kind": "electrical",
          "unit": "kHz",
          "min": 0.1,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VBB Undervoltage Lockout (UVLO)",
          "symbol": "VBBUVLO",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 3.85,
          "max": 3.98,
          "conditions": "VBB rising",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "VBB UVLO Hysteresis",
          "symbol": "VBBUVHYS",
          "kind": "electrical",
          "unit": "mV",
          "min": 150,
          "typ": 300,
          "max": 450,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Lock Protection",
          "symbol": "tOFF",
          "kind": "electrical",
          "unit": "s",
          "min": 7,
          "typ": 8,
          "max": 9,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Overcurrent Limiting (OCL)",
          "symbol": "IOCL",
          "kind": "electrical",
          "unit": "A",
          "min": 1.4,
          "typ": 1.6,
          "max": 1.8,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Thermal Shutdown Temperature (TSD)",
          "symbol": "TJTSD",
          "kind": "electrical",
          "unit": "°C",
          "min": 150,
          "typ": 165,
          "max": 180,
          "conditions": "Temperature rising",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Package Thermal Resistance (LJ package, 2-sided PCB, 0.8 in2 copper each side)",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 62,
          "max": null,
          "conditions": "LJ package, 2-sided PCB with 0.8 in2 copper each side",
          "source_page": 2,
          "source": "datasheet"
        }
      ]
    }
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  "discovery_pitch": "A4949GLJTR-T (Allegro MicroSystems LLC) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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