A3901SEJTR-T

{
  "schema_version": 1,
  "type": "component",
  "slug": "a3901sejtr-t",
  "title": "A3901SEJTR-T",
  "brief": "Allegro MicroSystems LLC Stepper Motor Driver, DFN-10-EP(3x3). 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",
    "motor driver ics",
    "a3901sejtr-t",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "A3901SEJTR-T",
    "manufacturer": "Allegro MicroSystems LLC",
    "package": "DFN-10-EP(3x3)",
    "pin_count": 11,
    "category": "Motor Driver ICs",
    "subcategory": "Stepper Motor Driver",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588881606157479936",
    "parts": {
      "symbol": "a3901sejtr-t.kicad_sym",
      "footprint": "a3901sejtr-t.kicad_mod",
      "model_3d": "a3901sejtr-t-hero.glb",
      "model_3d_plain": "a3901sejtr-t-etched.glb",
      "model_3d_step": "a3901sejtr-t-etched.step",
      "model_3d_step_plain": "a3901sejtr-t.step",
      "lbr": "a3901sejtr-t.lbr"
    },
    "distributor_links": {
      "lcsc": "C146403"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T12:11:38Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "IN1",
        "type": "input",
        "description": "Logic input 1 controls bridge 1; it is 3 to 5 V logic compatible, with VIN(1) min of VBB/2, VIN(0) max of 0.5 V, and an absolute maximum input range of -0.3 to 6 V."
      },
      {
        "number": "2",
        "name": "IN2",
        "type": "input",
        "description": "Logic input 2 controls bridge 1; it is 3 to 5 V logic compatible, with VIN(1) min of VBB/2, VIN(0) max of 0.5 V, and an absolute maximum input range of -0.3 to 6 V."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Ground terminal for the device, to be connected to the exposed thermal pad externally."
      },
      {
        "number": "4",
        "name": "IN3",
        "type": "input",
        "description": "Logic input 3 controls bridge 2; it is 3 to 5 V logic compatible, with VIN(1) min of VBB/2, VIN(0) max of 0.5 V, and an absolute maximum input range of -0.3 to 6 V."
      },
      {
        "number": "5",
        "name": "IN4",
        "type": "input",
        "description": "Logic input 4 controls bridge 2; it is 3 to 5 V logic compatible, with VIN(1) min of VBB/2, VIN(0) max of 0.5 V, and an absolute maximum input range of -0.3 to 6 V."
      },
      {
        "number": "6",
        "name": "OUT4",
        "type": "output",
        "description": "Bridge 2 output to load, rated up to ±400 mA per channel (±800 mA when outputs are paralleled), subject to duty cycle, ambient temperature and heat sinking."
      },
      {
        "number": "7",
        "name": "OUT3",
        "type": "output",
        "description": "Bridge 2 output to load, rated up to ±400 mA per channel (±800 mA when outputs are paralleled), subject to duty cycle, ambient temperature and heat sinking."
      },
      {
        "number": "8",
        "name": "VBB",
        "type": "power_in",
        "description": "Load supply terminal, operating from 2.5 to 5.5 V with an absolute maximum load supply voltage of 7 V."
      },
      {
        "number": "9",
        "name": "OUT2",
        "type": "output",
        "description": "Bridge 1 output to load, rated up to ±400 mA per channel (±800 mA when outputs are paralleled), subject to duty cycle, ambient temperature and heat sinking."
      },
      {
        "number": "10",
        "name": "OUT1",
        "type": "output",
        "description": "Bridge 1 output to load, rated up to ±400 mA per channel (±800 mA when outputs are paralleled), subject to duty cycle, ambient temperature and heat sinking."
      },
      {
        "number": "11",
        "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 exposed thermal pad is unnumbered in the datasheet (shown as '–' in the terminal diagram). It is; Package hint DFN-10-EP(3x3) matches the datasheet's 10-lead DFN (EJ) package with exposed pad, and t",
          "exposed pad 11 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint"
        ],
        "pages_sent": 12,
        "cost_usd": 0.0528,
        "at": "2026-10-18T12:09:04"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588881606157479936",
        "pages": 12,
        "sha256": "a40f5dda70311158",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 11,
        "described": 11,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "a3901sejtr-t.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          3,
          2.98,
          0.77
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "738e2eb45860c11759f8e4f44ab26932b7c15e4d5d6c8c9ac22ae866a3e38711",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "a3901sejtr-t-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          3,
          2.98,
          0.77
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "cb11c1dcd502af7ae3aa0d3e87925c48be26aa79daa85e4ec8f2db7e78487211",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Allegro MicroSystems LLC",
      "Package": "DFN-10-EP(3x3)",
      "Category": "Motor Driver ICs",
      "Pins": "11"
    },
    "appearance": {
      "contacts": {
        "quote": "(package “EJ”). This small footprint package is lead (Pb) free, with 100% matte tin leadframe plating.",
        "page": 1,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
      "datasheet_sha256": "a40f5dda70311158a86aada690fd28e48bd73ccc3070e9f6e48c78f02baa1998"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "a40f5dda70311158a86aada690fd28e48bd73ccc3070e9f6e48c78f02baa1998",
      "rows": [
        {
          "name": "Load Supply Voltage",
          "symbol": "VBB",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Output Current per Channel",
          "symbol": "IOUT",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 400,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Logic Input Voltage Range",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 6,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Junction Temperature",
          "symbol": "TJ",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature Range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Operating Temperature Range",
          "symbol": "TA",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -20,
          "typ": null,
          "max": 85,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Operating Load Supply Voltage (EC header range)",
          "symbol": "VBB",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 2.5,
          "typ": null,
          "max": 5.5,
          "conditions": "TA = 25°C, unless noted otherwise",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output On Resistance, source driver",
          "symbol": "RDS(on)",
          "kind": "electrical",
          "unit": "Ω",
          "min": 1,
          "typ": 1.8,
          "max": 2.2,
          "conditions": "Source driver, VBB = 3 V, IOUT = 300 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output On Resistance, source driver",
          "symbol": "RDS(on)",
          "kind": "electrical",
          "unit": "Ω",
          "min": 1,
          "typ": 1.2,
          "max": 1.4,
          "conditions": "Source driver, VBB = 5 V, IOUT = 300 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output On Resistance, sink driver",
          "symbol": "RDS(on)",
          "kind": "electrical",
          "unit": "Ω",
          "min": 0.5,
          "typ": 1.2,
          "max": 1.4,
          "conditions": "Sink driver, VBB = 3 V, IOUT = 300 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Output On Resistance, sink driver",
          "symbol": "RDS(on)",
          "kind": "electrical",
          "unit": "Ω",
          "min": 0.5,
          "typ": 0.8,
          "max": 1,
          "conditions": "Sink driver, VBB = 5 V, IOUT = 300 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Clamp Diode",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1.5,
          "conditions": "I = 300 mA",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Motor Supply Current sleep mode, VBB = 3 V",
          "symbol": "IBB",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "Sleep mode, VBB = 3 V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Motor Supply Current sleep mode, VBB = 5 V",
          "symbol": "IBB",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "Sleep mode, VBB = 5 V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Logic Input Voltage, logic low",
          "symbol": "VIN(0)",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.5,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Logic Input Current, logic high",
          "symbol": "IIN(1)",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "VIN = 2.0 V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Logic Input Current, logic low",
          "symbol": "IIN(0)",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": -500,
          "conditions": "VIN = 0.5 V",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Motor Supply Current",
          "symbol": "IBB",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 0.6,
          "max": null,
          "conditions": "All outputs PWMed at 20 kHz",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input Voltage Hysteresis",
          "symbol": "Vhys",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 150,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay, turn-on",
          "symbol": "tpd(on)",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 130,
          "max": null,
          "conditions": "Input Low to Sink On, Input High to Source On",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Propagation Delay, turn-off",
          "symbol": "tpd(off)",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 50,
          "max": null,
          "conditions": "Input High to Sink Off, Input Low to Source Off",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Crossover Delay",
          "symbol": "tCOD",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": 80,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Thermal Shut Down Temperature",
          "symbol": "TJ",
          "kind": "thermal",
          "unit": "°C",
          "min": null,
          "typ": 150,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Thermal Shut Down Hysteresis",
          "symbol": "TJhys",
          "kind": "thermal",
          "unit": "°C",
          "min": null,
          "typ": 10,
          "max": null,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Package Thermal Resistance",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 45,
          "max": null,
          "conditions": "Measured on 4-layer board based on JEDEC standard",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Package Thermal Resistance",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 65,
          "max": null,
          "conditions": "Measured on 2-layer board with copper limited to solder pads and 0.88 in2 of copper on each side",
          "source_page": 4,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "a3901sejtr-t"
  ],
  "discovery_pitch": "A3901SEJTR-T (Allegro MicroSystems LLC) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "a3901sejtr-t.kicad_sym",
    "a3901sejtr-t.kicad_mod",
    "a3901sejtr-t.glb",
    "a3901sejtr-t.step",
    "a3901sejtr-t.lbr",
    "docs/hero.png",
    "docs/a3901sejtr-t-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "a3901sejtr-t-hero.glb",
    "a3901sejtr-t-hero.overlay.json",
    "a3901sejtr-t-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}