LM3423MHX

{
  "slug": "lm3423mhx",
  "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",
    "led drivers",
    "lm3423mhx",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "lm3423mhx.kicad_sym",
    "lm3423mhx.kicad_mod",
    "lm3423mhx.glb",
    "lm3423mhx.step",
    "lm3423mhx.lbr",
    "docs/hero.png",
    "docs/lm3423mhx-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "lm3423mhx-hero.glb",
    "lm3423mhx-hero.overlay.json"
  ],
  "component": {
    "mpn": "LM3423MHX",
    "manufacturer": "Texas Instruments",
    "package": "HTSSOP-20-EP",
    "pin_count": 21,
    "category": "LED Drivers",
    "subcategory": "LED Drivers",
    "datasheet": "https://www.ti.com/cn/lit/gpn/lm3423",
    "parts": {
      "symbol": "lm3423mhx.kicad_sym",
      "footprint": "lm3423mhx.kicad_mod",
      "model_3d": "lm3423mhx-hero.glb",
      "model_3d_plain": "lm3423mhx.glb",
      "model_3d_step": "lm3423mhx-etched.step",
      "model_3d_step_plain": "lm3423mhx.step",
      "lbr": "lm3423mhx.lbr"
    },
    "distributor_links": {
      "lcsc": "C2679102"
    },
    "distributor_check": {
      "checked_at": "2026-10-08T01:39:37Z",
      "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, recommended 4.5 V to 75 V, to be bypassed with a 100-nF capacitor to AGND as close to the device as possible."
      },
      {
        "number": "2",
        "name": "EN",
        "type": "input",
        "description": "Enable: 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 control loop compensation."
      },
      {
        "number": "4",
        "name": "CSH",
        "type": "input",
        "description": "Current sense high: connect a resistor to AGND to set the signal current, or a controlled current source or potentiometer to AGND for analog dimming."
      },
      {
        "number": "5",
        "name": "RCT",
        "type": "input",
        "description": "Resistor-capacitor timing: the external RC network sets the predictive off-time and therefore the switching frequency."
      },
      {
        "number": "6",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground, connected to PGND through the DAP copper pad to provide the 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 OVLO, with a precision 1.24 V turnoff threshold and 23 µA (typical) hysteresis current."
      },
      {
        "number": "8",
        "name": "nDIM",
        "type": "input",
        "description": "Dimming input and undervoltage protection: accepts a PWM signal and/or a VIN UVLO divider, with a 1.24 V turn-on threshold and 23 µA hysteresis current source."
      },
      {
        "number": "9",
        "name": "FLT",
        "type": "output",
        "description": "Fault flag: N-channel open-drain output that goes high when a fault condition is latched by the timer, to be pulled up from VIN through a resistor."
      },
      {
        "number": "10",
        "name": "TIMR",
        "type": "input",
        "description": "Fault timer: connect a capacitor to AGND to set the time delay before a sensed fault condition is latched."
      },
      {
        "number": "11",
        "name": "LRDY",
        "type": "output",
        "description": "LED ready flag: N-channel open-drain output that pulls down when the LED current is not in regulation, to be pulled up from VIN through a resistor."
      },
      {
        "number": "12",
        "name": "DPOL",
        "type": "input",
        "description": "Dim polarity: connect to AGND when dimming with a series P-channel MOSFET, or leave open when dimming with a series N-channel MOSFET."
      },
      {
        "number": "13",
        "name": "DDRV",
        "type": "output",
        "description": "Dim gate drive output: connect to the gate of the dimming MOSFET."
      },
      {
        "number": "14",
        "name": "PGND",
        "type": "power_in",
        "description": "Power ground, connected to AGND through the DAP copper pad to provide the ground return for GATE and DDRV."
      },
      {
        "number": "15",
        "name": "GATE",
        "type": "output",
        "description": "Main gate drive output: connect to the gate of the main switching MOSFET, which is driven by a 2 Ω, 1 A peak gate driver."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_out",
        "description": "Internal regulator output: bypass with a 2.2 µF to 3.3 µF ceramic capacitor to PGND."
      },
      {
        "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": "RPD",
        "type": "input",
        "description": "Resistor pulldown: connect the low side of all external resistor dividers (VIN UVLO, OVP) to implement zero-current shutdown."
      },
      {
        "number": "19",
        "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": "20",
        "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": "21",
        "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: Package is taken from the ordering addendum: LM3423MHX/NOPB is a 20-pin HTSSOP (PWP) on 2500-piece l; Datasheet pin table lists VCC as type I, but its description says it is the internal regulator outpu; Datasheet pin table lists FLT as type I, but its description says it is an N-channel open-drain outp"
        ],
        "pages_sent": 13,
        "cost_usd": 0.0877,
        "at": "2026-10-08T01:39:11"
      },
      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/lm3423",
        "pages": 79,
        "sha256": "5b165c52968afc7c",
        "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": "lm3423mhx.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.41,
          6.5,
          1.2
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "20a7827db3a9644292f3b84d57d9b532ba4045ac9b0a76014c6c55294dcb7d0c",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "lm3423mhx-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "a1d04832b3681c78a00a1b8034422324353ef3dfa416ccf882a1a4e0dffa0092",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}