LM3421Q1MHX

{
  "slug": "lm3421q1mhx",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments LED Drivers, HTSSOP-16-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "nixie tube driver-led driver",
    "lm3421q1mhx",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lm3421q1mhx.kicad_sym",
    "lm3421q1mhx.kicad_mod",
    "lm3421q1mhx.glb",
    "lm3421q1mhx.step",
    "lm3421q1mhx.lbr",
    "docs/hero.png",
    "docs/lm3421q1mhx-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lm3421q1mhx-hero.glb",
    "lm3421q1mhx-hero.overlay.json",
    "lm3421q1mhx-etched.glb"
  ],
  "component": {
    "mpn": "LM3421Q1MHX",
    "manufacturer": "Texas Instruments",
    "package": "HTSSOP-16-EP",
    "pin_count": 17,
    "category": "Nixie Tube Driver/LED Driver",
    "subcategory": "LED Drivers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm3421-q1",
    "parts": {
      "symbol": "lm3421q1mhx.kicad_sym",
      "footprint": "lm3421q1mhx.kicad_mod",
      "model_3d": "lm3421q1mhx-hero.glb",
      "model_3d_plain": "lm3421q1mhx-etched.glb",
      "model_3d_step": "lm3421q1mhx-etched.step",
      "model_3d_step_plain": "lm3421q1mhx.step",
      "lbr": "lm3421q1mhx.lbr"
    },
    "distributor_links": {
      "lcsc": "C2679084"
    },
    "distributor_check": {
      "checked_at": "2026-11-05T23:25:28Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VIN",
        "type": "power_in",
        "description": "Input voltage with a 4.5 V to 75 V range; bypass with a 100-nF capacitor to AGND as close to the device as possible."
      },
      {
        "number": "2",
        "name": "EN",
        "type": "input",
        "description": "Enable pin; connect to AGND for zero current shutdown or apply more than 2.4 V to enable the device."
      },
      {
        "number": "3",
        "name": "COMP",
        "type": "input",
        "description": "Compensation pin; connect a capacitor to AGND to set the compensation."
      },
      {
        "number": "4",
        "name": "CSH",
        "type": "input",
        "description": "Current sense high; connect a resistor to AGND to set the signal current."
      },
      {
        "number": "5",
        "name": "RCT",
        "type": "input",
        "description": "Resistor capacitor timing; the external RC network sets the predictive off-time and thus the switching frequency."
      },
      {
        "number": "6",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground; connect to PGND through the DAP copper pad to provide ground return for CSH, COMP, RCT, and TIMR."
      },
      {
        "number": "7",
        "name": "OVP",
        "type": "input",
        "description": "Overvoltage protection; connect to a resistor divider from VO to program output overvoltage lockout with a 1.24 V turnoff threshold."
      },
      {
        "number": "8",
        "name": "nDIM",
        "type": "input",
        "description": "Dimming input and undervoltage protection; turnon threshold is 1.24 V with turnoff hysteresis provided by a 23-µA current source."
      },
      {
        "number": "9",
        "name": "DDRV",
        "type": "output",
        "description": "Dim gate drive output; connect to the gate of the dimming MOSFET."
      },
      {
        "number": "10",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground; connect to AGND through the DAP copper pad to provide ground return for GATE and DDRV."
      },
      {
        "number": "11",
        "name": "GATE",
        "type": "output",
        "description": "Main gate drive output; connect to the gate of the main switching MOSFET."
      },
      {
        "number": "12",
        "name": "VCC",
        "type": "power_out",
        "description": "Internal regulator output; bypass with a 2.2-µF to 3.3-µF ceramic capacitor to PGND."
      },
      {
        "number": "13",
        "name": "IS",
        "type": "input",
        "description": "Main switch current sense; connect to the drain of the main N-channel MOSFET for RDS-ON sensing or to a sense resistor in its source."
      },
      {
        "number": "14",
        "name": "RPD",
        "type": "input",
        "description": "Resistor pulldown; connect the low side of all external resistor dividers (VIN UVLO, OVP) to implement zero-current shutdown."
      },
      {
        "number": "15",
        "name": "HSP",
        "type": "input",
        "description": "LED current sense positive; connect through a series resistor to the positive side of the LED current sense resistor."
      },
      {
        "number": "16",
        "name": "HSN",
        "type": "input",
        "description": "LED current sense negative; connect through a series resistor to the negative side of the LED current sense resistor."
      },
      {
        "number": "17",
        "name": "DAP",
        "type": "power_in",
        "description": "Thermal pad on the bottom of the IC acting as a star ground that connects AGND and PGND."
      }
    ],
    "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's 16-pin table lists the exposed thermal pad as DAP (17), which is not a numbered lead"
        ],
        "pages_sent": 13,
        "cost_usd": 0.0248,
        "at": "2026-11-05T23:25:20"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm3421-q1",
        "pages": 80,
        "sha256": "e82ddb4d986b65c0",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 17,
        "described": 17,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "lm3421q1mhx.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          5.0,
          1.1
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "7982746831c0bd23f4690608869ad67776faae5c762fb0376666126a3998921b",
        "checked": "2026-11-05",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lm3421q1mhx-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
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        "sha256": "5af5d8f790dbf7020d5bb2839f02999aac90641f44fc1c6d1308f4015b8d1ab5",
        "checked": "2026-11-05",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}