LM3424QMHX

{
  "slug": "lm3424qmhx",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments LED Drivers, HTSSOP-20-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "nixie tube driver-led driver",
    "lm3424qmhx",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lm3424qmhx.kicad_sym",
    "lm3424qmhx.kicad_mod",
    "lm3424qmhx.glb",
    "lm3424qmhx.step",
    "lm3424qmhx.lbr",
    "docs/hero.png",
    "docs/lm3424qmhx-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lm3424qmhx-hero.glb",
    "lm3424qmhx-hero.overlay.json"
  ],
  "component": {
    "mpn": "LM3424QMHX",
    "manufacturer": "Texas Instruments",
    "package": "HTSSOP-20-EP",
    "pin_count": 21,
    "category": "Nixie Tube Driver/LED Driver",
    "subcategory": "LED Drivers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm3424-q1",
    "parts": {
      "symbol": "lm3424qmhx.kicad_sym",
      "footprint": "lm3424qmhx.kicad_mod",
      "model_3d": "lm3424qmhx-hero.glb",
      "model_3d_plain": "lm3424qmhx.glb",
      "model_3d_step": "lm3424qmhx-etched.step",
      "model_3d_step_plain": "lm3424qmhx.step",
      "lbr": "lm3424qmhx.lbr"
    },
    "distributor_links": {
      "lcsc": "C701844"
    },
    "distributor_check": {
      "checked_at": "2026-10-08T04:17:34Z",
      "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 pin; bypass with a 100 nF capacitor to GND as close to the device as possible."
      },
      {
        "number": "2",
        "name": "EN",
        "type": "input",
        "description": "Enable pin; connect to more than 2.4 V to enable the device or to less than 0.8 V for low-power shutdown."
      },
      {
        "number": "3",
        "name": "COMP",
        "type": "input",
        "description": "Compensation pin; connect a capacitor to GND to compensate the control loop."
      },
      {
        "number": "4",
        "name": "CSH",
        "type": "input",
        "description": "Current sense high; connect a resistor to GND to set the signal current, which can also be used for analog dimming."
      },
      {
        "number": "5",
        "name": "RT",
        "type": "input",
        "description": "Resistor timing; connect a resistor to GND to set the switching frequency, which can also be synchronized to an external clock."
      },
      {
        "number": "6",
        "name": "nDIM",
        "type": "input",
        "description": "Dimming input and under-voltage protection; accepts a PWM dimming signal and/or a resistor divider from VIN to program input undervoltage lockout."
      },
      {
        "number": "7",
        "name": "SS",
        "type": "input",
        "description": "Soft-start; connect a capacitor to GND to extend start-up time."
      },
      {
        "number": "8",
        "name": "TGAIN",
        "type": "input",
        "description": "Temperature foldback gain; connect a resistor to GND to set the foldback slope."
      },
      {
        "number": "9",
        "name": "TSENSE",
        "type": "input",
        "description": "Temperature sense input; connect a resistor/thermistor divider from VS to sense temperature."
      },
      {
        "number": "10",
        "name": "TREF",
        "type": "input",
        "description": "Temperature foldback reference; connect a resistor divider from VS to set the foldback reference voltage."
      },
      {
        "number": "11",
        "name": "VS",
        "type": "power_in",
        "description": "2.45 V voltage reference for the temperature foldback circuit and other external circuitry."
      },
      {
        "number": "12",
        "name": "OVP",
        "type": "input",
        "description": "Over-voltage protection; connect a resistor divider from VO to program the output over-voltage lockout."
      },
      {
        "number": "13",
        "name": "DDRV",
        "type": "output",
        "description": "Dimming gate drive output; connect to the gate of the dimming MOSFET."
      },
      {
        "number": "14",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; connect to DAP to provide proper system GND."
      },
      {
        "number": "15",
        "name": "GATE",
        "type": "output",
        "description": "Main gate drive output; connect to the gate of the main switching MOSFET."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "Internal regulator output; bypass with a 2.2 µF to 3.3 µF ceramic capacitor to GND."
      },
      {
        "number": "17",
        "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": "18",
        "name": "SLOPE",
        "type": "input",
        "description": "Slope compensation; connect a resistor to GND to set the slope of the additional ramp."
      },
      {
        "number": "19",
        "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": "20",
        "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": "21",
        "name": "DAP",
        "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 DAP (exposed thermal pad) is not a numbered pin in the datasheet pin table; it is listed as 'DAP; Pin types are taken from the datasheet's I/O column (I/O/input/output). Pin 14 GND and the DAP are t; Only the pin table on page 3 was provided in this excerpt. The top-view drawing on that page has gar",
          "exposed pad 21 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint"
        ],
        "pages_sent": 10,
        "cost_usd": 0.0726,
        "at": "2026-10-08T04:17:08"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm3424-q1",
        "pages": 69,
        "sha256": "d97444a162985e8c",
        "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": [
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          1.2
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        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "1c41aa2a06fa2ba9a47c650f53ae8f319c04ccd268888d442b156533c4f77f5a",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lm3424qmhx-etched.step",
        "role": "eda",
        "up": "Z",
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        "sha256": "0916d0d3b10c3fb12e1e8b9c11990b27b32b54f0b56884484c250f3957415cfd",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}