LM3421Q1MHX

{
  "schema_version": 1,
  "type": "component",
  "slug": "lm3421q1mhx",
  "title": "LM3421Q1MHX",
  "brief": "Texas Instruments LED Drivers, HTSSOP-16-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",
    "nixie tube driver-led driver",
    "lm3421q1mhx",
    "factory-2.0.0",
    "extractor-text"
  ],
  "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,
          1.1
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 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",
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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        "sha256": "5af5d8f790dbf7020d5bb2839f02999aac90641f44fc1c6d1308f4015b8d1ab5",
        "checked": "2026-11-05",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "HTSSOP-16-EP",
      "Category": "Nixie Tube Driver/LED Driver",
      "Pins": "17"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "e82ddb4d986b65c053e09318daed833db673cc643088d8fb6a0aeb9242962969",
      "rows": [
        {
          "name": "Input voltage",
          "symbol": "VIN",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 4.5,
          "typ": null,
          "max": 75,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Operating junction temperature (LM3421-Q1)",
          "symbol": "TJ",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "LM3421-Q1",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "VCC regulation",
          "symbol": "VCCREG",
          "kind": "electrical",
          "unit": "V",
          "min": 6.3,
          "typ": null,
          "max": 7.35,
          "conditions": "ICC = 0 mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "VCC current limit",
          "symbol": "ICCLIM",
          "kind": "electrical",
          "unit": "mA",
          "min": 20,
          "typ": null,
          "max": null,
          "conditions": "VCC = 0 V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Quiescent current (LM3421-Q1)",
          "symbol": "IQ",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 3,
          "conditions": "VEN = 3 V, Static",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Shutdown current",
          "symbol": "ISD",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "VEN = 0 V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "VCC UVLO threshold (increasing)",
          "symbol": "VCCUV",
          "kind": "electrical",
          "unit": "V",
          "min": 4.5,
          "typ": null,
          "max": null,
          "conditions": "VCC Increasing",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "VCC UVLO hysteresis",
          "symbol": "VCCHYS",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.1,
          "max": null,
          "conditions": "TA = 25°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "EN start-up threshold (increasing, LM3421-Q1)",
          "symbol": "ENST",
          "kind": "electrical",
          "unit": "V",
          "min": 2.4,
          "typ": null,
          "max": null,
          "conditions": "VEN Increasing",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "EN start-up hysteresis",
          "symbol": "ENSTHYS",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.1,
          "max": null,
          "conditions": "TA = 25°C",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "EN pulldown resistance",
          "symbol": "REN",
          "kind": "electrical",
          "unit": "MΩ",
          "min": 0.245,
          "typ": null,
          "max": 2.85,
          "conditions": "VEN = 1 V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "OVP OVLO threshold",
          "symbol": "OVPCB",
          "kind": "electrical",
          "unit": "V",
          "min": 1.185,
          "typ": null,
          "max": 1.285,
          "conditions": "OVP Increasing",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "OVP hysteresis source current (LM3421-Q1)",
          "symbol": "OVPHYS",
          "kind": "electrical",
          "unit": "µA",
          "min": 20,
          "typ": null,
          "max": 25,
          "conditions": "OVP Active (high)",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "DPOL logic threshold",
          "symbol": "DPOLTHRSH",
          "kind": "electrical",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": 2.6,
          "conditions": "DPOL Increasing",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "FAULT threshold (LM3421-Q1)",
          "symbol": "VFLTTH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.185,
          "typ": null,
          "max": 1.285,
          "conditions": "",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "FAULT pin source current (LM3421-Q1)",
          "symbol": "IFLT",
          "kind": "electrical",
          "unit": "µA",
          "min": 10,
          "typ": null,
          "max": 13,
          "conditions": "",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "CSH reference voltage",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 1.21,
          "typ": null,
          "max": 1.26,
          "conditions": "w/r/t to AGND",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Error amplifier input bias current",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": -0.6,
          "typ": 0,
          "max": 0.6,
          "conditions": "TJ = 25°C",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "COMP sink or source current (LM3421-Q1)",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": 22,
          "typ": null,
          "max": 35,
          "conditions": "",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Linear input range",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": -125,
          "typ": null,
          "max": 125,
          "conditions": "TJ = 25°C; specified by design",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "VRCT VIN/25 reference voltage (LM3421-Q1)",
          "symbol": "VRCT",
          "kind": "electrical",
          "unit": "mV",
          "min": 540,
          "typ": null,
          "max": 585,
          "conditions": "VIN = 14 V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "COMP-to-PWM offset voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": 700,
          "typ": null,
          "max": 900,
          "conditions": "",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Current limit threshold",
          "symbol": "ILIM",
          "kind": "electrical",
          "unit": "mV",
          "min": 215,
          "typ": null,
          "max": 275,
          "conditions": "",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Leading edge blanking time",
          "symbol": "tLEB",
          "kind": "electrical",
          "unit": "ns",
          "min": 115,
          "typ": null,
          "max": 325,
          "conditions": "",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Input offset current",
          "symbol": "",
          "kind": "electrical",
          "unit": "µA",
          "min": -1.5,
          "typ": null,
          "max": 1.5,
          "conditions": "",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "Input offset voltage",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": -7,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "nDIM / UVLO threshold",
          "symbol": "nDIMVTH",
          "kind": "electrical",
          "unit": "V",
          "min": 1.185,
          "typ": null,
          "max": 1.285,
          "conditions": "",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "nDIM hysteresis current (LM3421-Q1)",
          "symbol": "nDIMHYS",
          "kind": "electrical",
          "unit": "µA",
          "min": 20,
          "typ": null,
          "max": 25,
          "conditions": "",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "GATE sourcing resistance",
          "symbol": "RSRC(GATE)",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 6,
          "conditions": "GATE = High",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "GATE sinking resistance",
          "symbol": "RSNK(GATE)",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 4.5,
          "conditions": "GATE = Low",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "DDRV sourcing resistance",
          "symbol": "RSRC(DDRV)",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 30,
          "conditions": "DDRV = High",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "DDRV sinking resistance",
          "symbol": "RSNK(DDRV)",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "DDRV = Low",
          "source_page": 9,
          "source": "datasheet"
        },
        {
          "name": "RPD pulldown resistance (LM3421-Q1)",
          "symbol": "RRPD",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 300,
          "conditions": "",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "FLT pulldown resistance (LM3421-Q1)",
          "symbol": "RFLT",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 300,
          "conditions": "",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "LRDY pulldown resistance (LM3421-Q1)",
          "symbol": "RLRDY",
          "kind": "electrical",
          "unit": "Ω",
          "min": null,
          "typ": null,
          "max": 300,
          "conditions": "",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "Thermal shutdown threshold (LM3421-Q1)",
          "symbol": "TSD",
          "kind": "thermal",
          "unit": "°C",
          "min": null,
          "typ": 165,
          "max": null,
          "conditions": "TJ = 25°C",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "Thermal shutdown hysteresis",
          "symbol": "THYS",
          "kind": "thermal",
          "unit": "°C",
          "min": null,
          "typ": 25,
          "max": null,
          "conditions": "TJ = 25°C",
          "source_page": 10,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-ambient thermal resistance (PWP HTSSOP 16 pins)",
          "symbol": "RθJA",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 38.9,
          "max": null,
          "conditions": "PWP (HTSSOP), 16 pins",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-case (top) thermal resistance (PWP HTSSOP 16 pins)",
          "symbol": "RθJC(top)",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 23.1,
          "max": null,
          "conditions": "PWP (HTSSOP), 16 pins",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-board thermal resistance (PWP HTSSOP 16 pins)",
          "symbol": "RθJB",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 16.8,
          "max": null,
          "conditions": "PWP (HTSSOP), 16 pins",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-top characterization parameter (PWP HTSSOP 16 pins)",
          "symbol": "ψJT",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 0.6,
          "max": null,
          "conditions": "PWP (HTSSOP), 16 pins",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-board characterization parameter (PWP HTSSOP 16 pins)",
          "symbol": "ψJB",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 16.6,
          "max": null,
          "conditions": "PWP (HTSSOP), 16 pins",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Junction-to-case (bottom) thermal resistance (PWP HTSSOP 16 pins)",
          "symbol": "RθJC(bot)",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 1.7,
          "max": null,
          "conditions": "PWP (HTSSOP), 16 pins",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Absolute maximum voltage: VIN, EN, RPD, nDIM",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 76,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Absolute maximum voltage: OVP, HSP, HSN, LRDY, FLT, DPOL",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 76,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Absolute maximum voltage: IS",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 76,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Absolute maximum voltage: VCC",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 8,
          "conditions": "",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Absolute maximum voltage: TIMR",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
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