LMR51420XFDDCR

{
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  "type": "component",
  "slug": "lmr51420xfddcr",
  "title": "LMR51420XFDDCR",
  "brief": "TEXAS INSTRUMENTS Global Sourcing Parts, SOT-23-6. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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  "component": {
    "mpn": "LMR51420XFDDCR",
    "manufacturer": "TEXAS INSTRUMENTS",
    "package": "SOT-23-6",
    "pin_count": 6,
    "category": "Global Sourcing Parts",
    "subcategory": "Global Sourcing Parts",
    "datasheet": "https://www.ti.com/lit/ds/symlink/lmr51420.pdf",
    "parts": {
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      "lbr": "lmr51420xfddcr.lbr"
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    "distributor_links": {
      "lcsc": "C5752071",
      "digikey": "296-LMR51420XFDDCRTR-ND"
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    },
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Power ground terminal connected internally to the source of the low-side FET; connect to system ground and the ground side of CIN and COUT with the shortest possible path to CIN."
      },
      {
        "number": "2",
        "name": "SW",
        "type": "passive",
        "description": "Switching output of the converter, connected to the source of the high-side FET and drain of the low-side FET; connect to the power inductor."
      },
      {
        "number": "3",
        "name": "VIN",
        "type": "power_in",
        "description": "Supply input to the internal bias LDO and high-side FET (4.5 V to 36 V operating); connect to the input supply with input bypass capacitors CIN placed directly at this pin and GND."
      },
      {
        "number": "4",
        "name": "FB",
        "type": "input",
        "description": "Feedback input connected to a resistor divider from VOUT to set the output voltage against the 0.6-V reference; never short this pin to ground during operation."
      },
      {
        "number": "5",
        "name": "EN",
        "type": "input",
        "description": "Precision enable input (rising threshold 1.227 V typ, falling 1.08 V typ; high = on, low = off) that can be tied to VIN or used with a divider for adjustable UVLO; do not float, and keep it no more than 0.3 V above VIN."
      },
      {
        "number": "6",
        "name": "CB",
        "type": "passive",
        "description": "Bootstrap capacitor connection for the high-side FET driver; connect a high-quality 100-nF capacitor from this pin to the SW pin."
      }
    ],
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        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: Package hint said SOT-23-6, but the orderable addendum lists LMR51420XFDDCR as SOT-23-THIN (DDC) 6-p; Pin types were mapped from the datasheet's A/P/G classes. SW and CB are marked P (power) in the data"
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        "at": "2026-10-22T21:44:05"
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        "pages": 33,
        "sha256": "8cc7e8bc4ef9adba",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
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        "described": 6,
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  "metadata": {
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      "Manufacturer": "TEXAS INSTRUMENTS",
      "Package": "SOT-23-6",
      "Category": "Global Sourcing Parts",
      "Pins": "6"
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    "appearance": {
      "contacts": {
        "quote": "The SW pin connected to the inductor must be as short as possible, and just wide enough to carry the load current without excessive heating. Short, thick traces or copper pours (shapes) must be used f",
        "page": 21,
        "doc": "ds.pdf",
        "material": "copper"
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          "name": "Input voltage VIN to GND",
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          "name": "Junction-to-ambient thermal resistance",
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        {
          "name": "Junction-to-top characterization parameter",
          "symbol": "ψJT",
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          "name": "VIN shutdown supply current",
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          "kind": "electrical",
          "unit": "µA",
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          "typ": 3,
          "max": 15,
          "conditions": "VEN = 0 V",
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        {
          "name": "VIN UVLO rising threshold",
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          "name": "VIN UVLO hysteresis",
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        {
          "name": "EN voltage rising threshold",
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          "unit": "V",
          "min": 1.1,
          "typ": 1.227,
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          "conditions": "EN rising, enable switching",
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        {
          "name": "EN voltage falling threshold",
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          "typ": 1.08,
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          "conditions": "EN falling, disable switching",
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          "name": "EN pin sourcing current post EN rising threshold",
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          "conditions": "VEN = 3 V",
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          "name": "Reference voltage",
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          "min": 0.591,
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          "name": "FB input leakage current",
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          "conditions": "VFB = 1.2 V",
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        {
          "name": "Switching frequency, CCM, 500-kHz option",
          "symbol": "fSW1(CCM)",
          "kind": "electrical",
          "unit": "kHz",
          "min": 450,
          "typ": 500,
          "max": 560,
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        {
          "name": "Internal fixed soft-start time",
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          "typ": 4,
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          "name": "High-side MOSFET on-resistance",
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          "typ": 0.12,
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          "conditions": "TJ = 25℃",
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          "conditions": "VIN = 12 V, IOUT = 2 A",
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          "name": "Maximum ON pulse width",
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        {
          "name": "Minimum OFF pulse width",
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          "unit": "ns",
          "min": null,
          "typ": 150,
          "max": null,
          "conditions": "VIN = 4.5 V",
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          "name": "High-side peak current limit",
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          "conditions": "LM51420",
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          "name": "Low-side valley current limit",
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          "conditions": "LM51420",
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          "name": "Low-side negative current limit",
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          "unit": "A",
          "min": null,
          "typ": -1,
          "max": null,
          "conditions": "LM51420 FPWM Only",
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        {
          "name": "Zero-cross detection current threshold",
          "symbol": "IZC",
          "kind": "electrical",
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          "min": null,
          "typ": 0.02,
          "max": null,
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        {
          "name": "Thermal shutdown threshold",
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          "unit": "°C",
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          "typ": 163,
          "max": null,
          "conditions": "Temperature rising",
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          "name": "Thermal shutdown hysteresis",
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          "unit": "°C",
          "min": null,
          "typ": 22,
          "max": null,
          "conditions": "",
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        {
          "name": "Operating input voltage range (system)",
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        {
          "name": "Adjustable output voltage regulation, FPWM",
          "symbol": "VOUT",
          "kind": "electrical",
          "unit": "%",
          "min": -1.5,
          "typ": null,
          "max": 1.5,
          "conditions": "FPWM operation",
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          "source": "datasheet"
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        {
          "name": "Maximum switch duty cycle",
          "symbol": "DMAX",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 98,
          "max": null,
          "conditions": "",
          "source_page": 6,
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        },
        {
          "name": "FB pin voltage to trip hiccup mode",
          "symbol": "VHC",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.24,
          "max": null,
          "conditions": "",
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        {
          "name": "Switch voltage dead-time",
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          "min": null,
          "typ": 6.5,
          "max": null,
          "conditions": "",
          "source_page": 6,
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        {
          "name": "Thermal shutdown temperature",
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          "kind": "electrical",
          "unit": "°C",
          "min": null,
          "typ": 163,
          "max": null,
          "conditions": "Shutdown temperature",
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        },
        {
          "name": "Thermal shutdown recovery temperature",
          "symbol": "TSD",
          "kind": "electrical",
          "unit": "°C",
          "min": null,
          "typ": 141,
          "max": null,
          "conditions": "Recovery temperature",
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