main
Ray Set visibility: public 410a2c5
{
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  "type": "component",
  "slug": "lr123wf350mt4e",
  "title": "LR123WF350MT4E",
  "brief": "UNI ROYAL Uniroyal Elec Current Sense Resistors / Shunt Resistors, 2512. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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    "subcategory": "Current Sense Resistors / Shunt Resistors",
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      "source": "Component Ocean /api/assign-pns",
      "digikey": {
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        "description": "First terminal of the two-terminal LR12 (2512) metal strip chip resistor (2W/3W, ±1%, 35mΩ), a Sn-plated end electrode with a recommended land pad of 2.30 mm x 3.68 mm for 3~350mΩ values."
      },
      {
        "number": "2",
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      }
    ],
    "provenance": {
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        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
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          "vision extraction: provenance cannot be text-verified; needs consensus"
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        "cost_usd": 0.1637,
        "at": "2026-11-07T03:57:05"
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        "pages": 6,
        "sha256": "697e24f2047069dc",
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        "sha256": "76b2052a3c120193de7cdc0af99157b6f375e9a4af7721e3e3d012968c877f27",
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  "metadata": {
    "specs": {
      "Manufacturer": "UNI ROYAL Uniroyal Elec",
      "Package": "2512",
      "Category": "Resistors",
      "Pins": "2"
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    "characteristics": {
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          "name": "Resistance range (3W part)",
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          "kind": "electrical",
          "unit": "mΩ",
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          "max": 350,
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          "source_page": 3,
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          "name": "Resistance tolerance",
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          "conditions": "Tolerance code F = ±1% (7th code of part number)",
          "source_page": 2,
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          "name": "Temperature coefficient of resistance",
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          "conditions": "t1: +25°C; t2: test temperature 125°C; TCR = (R2-R1)/(R1(t2-t1))×10^6",
          "source_page": 4,
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        },
        {
          "name": "Short-time overload resistance change",
          "symbol": "ΔR",
          "kind": "electrical",
          "unit": "%",
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          "typ": null,
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          "conditions": "LR12-3W: 4 times rated power for 5 seconds",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Load life resistance change",
          "symbol": "ΔR",
          "kind": "electrical",
          "unit": "%",
          "min": -1,
          "typ": null,
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          "conditions": "1000 hours at rated or max working current (whichever less), duty 1.5 h ON / 0.5 h OFF, 70±2°C ambient",
          "source_page": 4,
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        },
        {
          "name": "High temperature exposure resistance change",
          "symbol": "ΔR",
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          "unit": "%",
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          "typ": null,
          "max": 1,
          "conditions": "155±2°C for 1000 H (MIL-STD-202 108A)",
          "source_page": 4,
          "source": "datasheet"
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        {
          "name": "Biased humidity resistance change",
          "symbol": "ΔR",
          "kind": "electrical",
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        {
          "name": "Rapid change of temperature resistance change",
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          "typ": null,
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          "conditions": "30 min at -55°C and 30 min at 155°C; 100 cycles",
          "source_page": 4,
          "source": "datasheet"
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        {
          "name": "Terminal bending resistance change",
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          "min": -0.5,
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          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Resistance to solder heat resistance change",
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          "kind": "electrical",
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          "conditions": "Dip at 260±5°C, hold 10±1 seconds",
          "source_page": 4,
          "source": "datasheet"
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        {
          "name": "Solderability solder coverage",
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          "unit": "%",
          "min": 95,
          "typ": null,
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          "conditions": "Solder temperature 245±3°C; dwell time 2~3 seconds; coverage of new, clean surface",
          "source_page": 4,
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        {
          "name": "Dielectric withstanding surge current limit",
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          "source_page": 4,
          "source": "datasheet"
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          "name": "Recommended storage temperature",
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          "name": "Recommended storage humidity",
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          "source": "datasheet"
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  "discovery_pitch": "LR123WF350MT4E (UNI ROYAL Uniroyal Elec) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray"
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