A4955GESTR-T

{
  "slug": "a4955gestr-t",
  "version": "0.1.0",
  "type": "component",
  "description": "Allegro MicroSystems LLC Brushed DC Motor Drivers, QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "motor driver ics",
    "a4955gestr-t",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "a4955gestr-t.kicad_sym",
    "a4955gestr-t.kicad_mod",
    "a4955gestr-t.glb",
    "a4955gestr-t.step",
    "a4955gestr-t.lbr",
    "docs/hero.png",
    "docs/a4955gestr-t-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "a4955gestr-t-hero.glb",
    "a4955gestr-t-hero.overlay.json",
    "a4955gestr-t-etched.glb"
  ],
  "component": {
    "mpn": "A4955GESTR-T",
    "manufacturer": "Allegro MicroSystems LLC",
    "package": "QFN-20-EP(4x4)",
    "pin_count": 21,
    "category": "Motor Driver ICs",
    "subcategory": "Brushed DC Motor Drivers",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589837998499000320",
    "parts": {
      "symbol": "a4955gestr-t.kicad_sym",
      "footprint": "a4955gestr-t.kicad_mod",
      "model_3d": "a4955gestr-t-hero.glb",
      "model_3d_plain": "a4955gestr-t-etched.glb",
      "model_3d_step": "a4955gestr-t-etched.step",
      "model_3d_step_plain": "a4955gestr-t.step",
      "lbr": "a4955gestr-t.lbr"
    },
    "distributor_links": {
      "lcsc": "C5204686",
      "digikey": "620-1769-2-ND",
      "mouser": "250-A4955GESTR-T"
    },
    "distributor_check": {
      "checked_at": "2026-10-20T18:41:13Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "620-1769-2-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "250-A4955GESTR-T",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "ISET",
        "type": "passive",
        "description": "Terminal to set gate drive current; a resistor from ISET to ground sets the gate current, and RISET should be between 15 and 150 kΩ."
      },
      {
        "number": "2",
        "name": "SLEEPn",
        "type": "input",
        "description": "Active-low sleep input that puts the device into low-power standby mode, with a SLEEPn input low level of 0.4 V maximum."
      },
      {
        "number": "3",
        "name": "SENSE",
        "type": "passive",
        "description": "Sense resistor connection and low-side gate return, with VSENSE limited to -0.5 to 0.5 V (-4 to 4 V for tW < 500 ns)."
      },
      {
        "number": "4",
        "name": "GLB",
        "type": "output",
        "description": "Low-side gate drive output for the B-side external MOSFET, specified at 6.5 to 7.5 V for VBB = 8 to 50 V."
      },
      {
        "number": "5",
        "name": "GLA",
        "type": "output",
        "description": "Low-side gate drive output for the A-side external MOSFET, specified at 6.5 to 7.5 V for VBB = 8 to 50 V."
      },
      {
        "number": "6",
        "name": "GHB",
        "type": "output",
        "description": "High-side gate drive output for the B-side external MOSFET, specified at 6.5 to 7.5 V relative to VBB for VBB = 8 to 50 V."
      },
      {
        "number": "7",
        "name": "SB",
        "type": "output",
        "description": "High-side bridge reference connected to the B-side motor output, with the motor output VSx rated -2 to 52 V."
      },
      {
        "number": "8",
        "name": "GHA",
        "type": "output",
        "description": "High-side gate drive output for the A-side external MOSFET, specified at 6.5 to 7.5 V relative to VBB for VBB = 8 to 50 V."
      },
      {
        "number": "9",
        "name": "SA",
        "type": "output",
        "description": "High-side bridge reference connected to the A-side motor output, with the motor output VSx rated -2 to 52 V."
      },
      {
        "number": "10",
        "name": "VCP",
        "type": "power_out",
        "description": "Charge pump reservoir capacitor connection, internally monitored so that a low VCP fault disables the outputs."
      },
      {
        "number": "11",
        "name": "CP2",
        "type": "passive",
        "description": "Charge pump terminal for the charge pump flying capacitor."
      },
      {
        "number": "12",
        "name": "VBB",
        "type": "power_in",
        "description": "Load supply voltage, rated 50 V maximum, with UVLO enable threshold of 5.10 to 5.40 V (rising)."
      },
      {
        "number": "13",
        "name": "CP1",
        "type": "passive",
        "description": "Charge pump terminal for the charge pump flying capacitor."
      },
      {
        "number": "14",
        "name": "GND",
        "type": "power_in",
        "description": "Ground connection for the device."
      },
      {
        "number": "15",
        "name": "AIOUT",
        "type": "output",
        "description": "Analog output proportional to VSENSE with a gain of 9 to 11 V/V and output impedance of 0.75 to 1.45 kΩ."
      },
      {
        "number": "16",
        "name": "OCLn",
        "type": "output",
        "description": "Open-drain overcurrent and overvoltage (VDS fault) output flag, driven low during current limiting or a VDS fault, with output voltage of 0.3 V maximum at 2 mA."
      },
      {
        "number": "17",
        "name": "VREF",
        "type": "power_in",
        "description": "Analog overcurrent reference input, with a VREF input range of 0 to 2.5 V."
      },
      {
        "number": "18",
        "name": "IN2",
        "type": "input",
        "description": "Digital logic input 2, with VIH of 2.0 V minimum, VIL of 0.8 V maximum, and absolute maximum range of -0.3 to 5.5 V."
      },
      {
        "number": "19",
        "name": "IN1",
        "type": "input",
        "description": "Digital logic input 1, with VIH of 2.0 V minimum, VIL of 0.8 V maximum, and absolute maximum range of -0.3 to 5.5 V."
      },
      {
        "number": "20",
        "name": "RC",
        "type": "passive",
        "description": "Timing terminal for the RC network that sets the fixed off-time and blank-time, with RRC of 12 to 100 kΩ and CRC of 470 to 1500 pF."
      },
      {
        "number": "21",
        "name": "EP",
        "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 labels SA and SB only as 'High-side bridge reference' and gives VSx ratings; the ERC c; The exposed pad is shown in the terminal table with no number and the datasheet does not state wheth; ISET and RC are external timing/setting resistor and capacitor terminals; they are classed as passiv",
          "exposed pad 21 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint"
        ],
        "pages_sent": 11,
        "cost_usd": 0.062,
        "at": "2026-10-20T18:39:13"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589837998499000320",
        "pages": 11,
        "sha256": "3b297e0745286756",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 21,
        "described": 21,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "a4955gestr-t.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.0,
          4.0,
          0.77
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "c9476a1612023de37f27b4972110ab6ac6dc0eaf5ac48957a2e1c497650082a5",
        "checked": "2026-10-20",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "a4955gestr-t-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          4.0,
          4.0,
          0.77
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "19a9c96a9ee9b20f5bea7b63122fd525a50441d3b5c83ca8634ed69b351dfcaf",
        "checked": "2026-10-20",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}