A3941KLPTR-T

{
  "schema_version": 1,
  "type": "component",
  "slug": "a3941klptr-t",
  "title": "A3941KLPTR-T",
  "brief": "Allegro MicroSystems LLC Global Sourcing Parts, TSSOP-28-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": [
    "component",
    "global sourcing parts",
    "a3941klptr-t",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "A3941KLPTR-T",
    "manufacturer": "Allegro MicroSystems LLC",
    "package": "TSSOP-28-EP",
    "pin_count": 29,
    "category": "Global Sourcing Parts",
    "subcategory": "Global Sourcing Parts",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588881832846757888",
    "parts": {
      "symbol": "a3941klptr-t.kicad_sym",
      "footprint": "a3941klptr-t.kicad_mod",
      "model_3d": "a3941klptr-t-etched.glb",
      "model_3d_plain": "a3941klptr-t.glb",
      "model_3d_step": "a3941klptr-t-etched.step",
      "model_3d_step_plain": "a3941klptr-t.step",
      "lbr": "a3941klptr-t.lbr"
    },
    "distributor_links": {
      "lcsc": "C83516"
    },
    "pins": [
      {
        "number": "1",
        "name": "VDRAIN",
        "type": "input",
        "description": "Low-current sense input (≤250 µA) from high-side FET drain for measuring bridge voltage at the positive supply connection point."
      },
      {
        "number": "2",
        "name": "LSS",
        "type": "power_in",
        "description": "Low-side return path for FET gate discharge current, connected independently with low impedance to common source of low-side FETs."
      },
      {
        "number": "3",
        "name": "GLB",
        "type": "output",
        "description": "Low-side gate drive output for phase B MOSFET with 60-150 ns propagation delay and 3-4 Ω pulldown on-resistance."
      },
      {
        "number": "4",
        "name": "SB",
        "type": "passive",
        "description": "Load connection B (motor phase terminal) sensing bridge voltage and providing negative supply reference for phase B bootstrap circuit."
      },
      {
        "number": "5",
        "name": "GHB",
        "type": "output",
        "description": "High-side gate drive output for phase B MOSFET powered from phase B bootstrap capacitor CB, with source-to-pin voltage VCB - 0.2 V minimum."
      },
      {
        "number": "6",
        "name": "CB",
        "type": "passive",
        "description": "Phase B bootstrap capacitor connection, charged to approximately 13 V (VREG) when SB is low, with working voltage limit 16 V."
      },
      {
        "number": "7",
        "name": "VREG",
        "type": "power_in",
        "description": "Regulated 13 V output (12.5-13.75 V at VBB > 9 V) supplying power to low-side gate drivers and bootstrap charging circuits."
      },
      {
        "number": "8",
        "name": "VREG",
        "type": "power_in",
        "description": "Regulated 13 V output (duplicate connection), second supply pin for power distribution."
      },
      {
        "number": "9",
        "name": "CA",
        "type": "passive",
        "description": "Phase A bootstrap capacitor connection, charged to approximately 13 V (VREG) when SA is low, with working voltage limit 16 V."
      },
      {
        "number": "10",
        "name": "GHA",
        "type": "output",
        "description": "High-side gate drive output for phase A MOSFET powered from phase A bootstrap capacitor CA, with source-to-pin voltage VCA - 0.2 V minimum."
      },
      {
        "number": "11",
        "name": "SA",
        "type": "passive",
        "description": "Load connection A (motor phase terminal) sensing bridge voltage and providing negative supply reference for phase A bootstrap circuit."
      },
      {
        "number": "12",
        "name": "GLA",
        "type": "output",
        "description": "Low-side gate drive output for phase A MOSFET with 60-150 ns propagation delay and 3-4 Ω pulldown on-resistance."
      },
      {
        "number": "13",
        "name": "VBB",
        "type": "power_in",
        "description": "Main power supply input, 5.5-50 V operating range (7-50 V functional), requires reverse voltage protection and 100 nF decoupling capacitor."
      },
      {
        "number": "14",
        "name": "VBB",
        "type": "power_in",
        "description": "Main power supply input (duplicate connection), second supply pin for current distribution."
      },
      {
        "number": "15",
        "name": "CP2",
        "type": "passive",
        "description": "Charge pump capacitor negative terminal, requires minimum 220 nF external capacitor between CP1 and CP2 when VBB < 16 V."
      },
      {
        "number": "16",
        "name": "CP1",
        "type": "passive",
        "description": "Charge pump capacitor positive terminal, requires minimum 220 nF external capacitor between CP1 and CP2 when VBB < 16 V."
      },
      {
        "number": "17",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for digital logic and analog circuits, requires independent low-impedance connection to motor supply common."
      },
      {
        "number": "18",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (duplicate connection), second ground pin for low-impedance returns."
      },
      {
        "number": "19",
        "name": "PHASE",
        "type": "input",
        "description": "Phase control input (0-5.5 V logic, 300-500 mV hysteresis) selecting load current direction or PWM input for four-quadrant control."
      },
      {
        "number": "20",
        "name": "V5",
        "type": "power_in",
        "description": "5 V logic supply output (4.5-5.5 V) from integrated regulator, requires minimum 100 nF decoupling capacitor between V5 and GND."
      },
      {
        "number": "21",
        "name": "SR",
        "type": "input",
        "description": "Synchronous rectification enable input (0-5.5 V logic, 300-500 mV hysteresis) turning on complementary MOSFETs during PWM off-time."
      },
      {
        "number": "22",
        "name": "PWML",
        "type": "input",
        "description": "Low-side PWM control input (0-5.5 V logic, 300-500 mV hysteresis) for slow or fast decay operation."
      },
      {
        "number": "23",
        "name": "PWMH",
        "type": "input",
        "description": "High-side PWM control input (0-5.5 V logic, 300-500 mV hysteresis) for slow or fast decay operation."
      },
      {
        "number": "24",
        "name": "RESET",
        "type": "input",
        "description": "Active-low reset input (0-5.5 V logic, 200 mV hysteresis, 50 kΩ internal pulldown) enabling sleep mode and clearing latched faults."
      },
      {
        "number": "25",
        "name": "FF1",
        "type": "tri_state",
        "description": "Open-drain fault flag output (<0.4 V when fault present, <1 µA leakage current) indicating overtemperature or combined fault conditions."
      },
      {
        "number": "26",
        "name": "FF2",
        "type": "tri_state",
        "description": "Open-drain fault flag output (<0.4 V when fault present, <1 µA leakage current) indicating short-circuit, undervoltage, or combined faults."
      },
      {
        "number": "27",
        "name": "RDEAD",
        "type": "input",
        "description": "Dead-time setting input (resistor 3 kΩ to 240 kΩ or V5 connection) controlling cross-conduction prevention delay from 180 ns to 6 µs."
      },
      {
        "number": "28",
        "name": "VDSTH",
        "type": "input",
        "description": "VDS threshold comparison input (0.1-2 V range) for FET short-circuit detection, disabled when voltage exceeds 4.95 V disable threshold."
      },
      {
        "number": "29",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.2",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.2",
        "primary_model": "claude-haiku-4-5-20251001",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-4-6",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "exposed pad 29 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint",
          "13/29 pins cited to the wrong page (name found elsewhere): ['4:SB@p8', '11:SA@p8', '12:GLA@p8', '14:VBB@p7']"
        ],
        "pages_sent": 21,
        "cost_usd": 0.4069,
        "at": "2026-09-22T05:11:54"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588881832846757888",
        "pages": 21,
        "sha256": "0134af8d609fc7c3",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 29,
        "described": 29,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "a3941klptr-t.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.2,
          9.7,
          1.05
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "ff242f1d3be9d09e7f929707a2c5b1ee974a4f882053b04bcdb1cd2cb21223ef",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "a3941klptr-t-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.2,
          9.7,
          1.05
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "538253b54f89125487d2e58d9d1335faa2e152076bb359be8ccc38f2e9cffe46",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Allegro MicroSystems LLC",
      "Package": "TSSOP-28-EP",
      "Category": "Global Sourcing Parts",
      "Pins": "29"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "a3941klptr-t"
  ],
  "discovery_pitch": "A3941KLPTR-T (Allegro MicroSystems LLC) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "a3941klptr-t.kicad_sym",
    "a3941klptr-t.kicad_mod",
    "a3941klptr-t.glb",
    "a3941klptr-t.step",
    "a3941klptr-t.lbr",
    "docs/hero.png",
    "docs/a3941klptr-t-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T15:27:27.405Z"
}