T2550-12I

{
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  "type": "component",
  "slug": "t2550-12i",
  "title": "T2550-12I",
  "brief": "STMicroelectronics Thyristors (SCR)/Modules, TO-220AB-3. 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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    "transistors-thyristors",
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  "component": {
    "mpn": "T2550-12I",
    "manufacturer": "STMicroelectronics",
    "package": "TO-220AB-3",
    "pin_count": 3,
    "category": "Transistors/Thyristors",
    "subcategory": "Thyristors (SCR)/Modules",
    "datasheet": "https://www.st.com/resource/en/datasheet/t2550-12i.pdf",
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      "lbr": "t2550-12i.lbr"
    },
    "distributor_links": {
      "lcsc": "C2971180",
      "mouser": "511-T2550-12I"
    },
    "distributor_check": {
      "checked_at": "2026-10-25T00:56:50Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "error"
      },
      "mouser": {
        "pn": "511-T2550-12I",
        "status": "found"
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    },
    "pins": [
      {
        "number": "1",
        "name": "A1",
        "type": "passive",
        "description": "Main terminal A1, the reference terminal for A2 in the electrical characteristics; the device blocks up to 1200 V (VDRM/VRRM) and carries 25 A RMS."
      },
      {
        "number": "2",
        "name": "A2",
        "type": "passive",
        "description": "Main terminal A2 of the triac, rated for 1200 V repetitive peak off-state voltage and 25 A RMS on-state current (Tc = 71 °C for the insulated package)."
      },
      {
        "number": "3",
        "name": "G",
        "type": "input",
        "description": "Gate trigger input with IGT max 50 mA (VD = 12 V, RL = 33 Ω), VGT max 1.3 V, peak gate current IGM 4 A for 20 µs."
      }
    ],
    "provenance": {
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        "guard_notes": [
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        "at": "2026-10-25T00:56:42"
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        "source_tier": "mfr"
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        "described": 3,
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        "zmin_mm": -9.75,
        "centre_offset_mm": 0.932,
        "footprint_binding": "identity",
        "sha256": "7cb065d935df5771f0ba6e48ddd180863a121af76483dad7f18e667a7b68204a",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "STMicroelectronics",
      "Package": "TO-220AB-3",
      "Category": "Transistors/Thyristors",
      "Pins": "3"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "9031904ec977d1f76962b1f8d8bad48371db7355e4a714f85be24ffb7fdacb4b",
      "rows": [
        {
          "name": "RMS on-state current (full sine wave), TO-220AB Ins.",
          "symbol": "IT(RMS)",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 25,
          "conditions": "TO-220AB Ins. Tc = 71 °C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Non repetitive surge peak on-state current",
          "symbol": "ITSM",
          "kind": "absolute_maximum",
          "unit": "A",
          "min": null,
          "typ": null,
          "max": 240,
          "conditions": "full cycle, Tj initial = 25 °C; tp = 20 ms",
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          "source": "datasheet"
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        {
          "name": "Non repetitive surge peak on-state current",
          "symbol": "ITSM",
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          "max": 252,
          "conditions": "full cycle, Tj initial = 25 °C; tp = 16.7 ms",
          "source_page": 2,
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        },
        {
          "name": "I2t value for fusing",
          "symbol": "I2t",
          "kind": "absolute_maximum",
          "unit": "A2s",
          "min": null,
          "typ": null,
          "max": 380,
          "conditions": "tp = 10 ms",
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        },
        {
          "name": "Critical rate of rise of on-state current",
          "symbol": "dI/dt",
          "kind": "absolute_maximum",
          "unit": "A/µs",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "IG = 2 x IGT, tr ≤ 100 ns; f = 60 Hz; Tj = 125 °C",
          "source_page": 2,
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        },
        {
          "name": "Repetitive peak off-state voltage",
          "symbol": "VDRM/VRRM",
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          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1200,
          "conditions": "",
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        },
        {
          "name": "Non repetitive surge peak off-state voltage",
          "symbol": "VDSM/VRSM",
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          "unit": "V",
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          "typ": null,
          "max": 1300,
          "conditions": "tp = 10 ms",
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        },
        {
          "name": "Peak gate current",
          "symbol": "IGM",
          "kind": "absolute_maximum",
          "unit": "A",
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          "typ": null,
          "max": 4,
          "conditions": "tp = 20 µs",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Peak positive gate voltage",
          "symbol": "VGM",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 16,
          "conditions": "tp = 20 µs",
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          "source": "datasheet"
        },
        {
          "name": "Average gate power dissipation",
          "symbol": "PG(AV)",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "",
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        },
        {
          "name": "Storage junction temperature range",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Operating junction temperature range",
          "symbol": "Tj",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 125,
          "conditions": "",
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        },
        {
          "name": "Insulation RMS voltage, 1 minute",
          "symbol": "Vins.",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 2500,
          "conditions": "TO-220AB Ins., 1 minute",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Gate trigger current",
          "symbol": "IGT",
          "kind": "electrical",
          "unit": "mA",
          "min": 2.5,
          "typ": null,
          "max": 50,
          "conditions": "VD = 12 V, RL = 33 Ω; quadrants I - II - III",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Gate trigger voltage",
          "symbol": "VGT",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1.3,
          "conditions": "quadrants I - II - III",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Gate non-trigger voltage",
          "symbol": "VGD",
          "kind": "electrical",
          "unit": "V",
          "min": 0.2,
          "typ": null,
          "max": null,
          "conditions": "VD = VDRM, RL = 3,3 kΩ, Tj = 125 °C; quadrants I - II - III",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Holding current",
          "symbol": "IH",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 60,
          "conditions": "IT = 500 mA, gate open",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Latching current",
          "symbol": "IL",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 80,
          "conditions": "IG = 1.2 IGT; quadrants I - II - III",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Critical rate of rise of off-state voltage",
          "symbol": "dV/dt",
          "kind": "electrical",
          "unit": "V/µs",
          "min": 2500,
          "typ": null,
          "max": null,
          "conditions": "VD = 67 % VDRM, gate open, Tj = 125 °C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Critical rate of decrease of main current",
          "symbol": "(dI/dt)c",
          "kind": "electrical",
          "unit": "A/ms",
          "min": 20,
          "typ": null,
          "max": null,
          "conditions": "Without snubber, Tj = 125 °C",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "Turn-on time",
          "symbol": "tgt",
          "kind": "electrical",
          "unit": "µs",
          "min": null,
          "typ": 2,
          "max": null,
          "conditions": "ITM = 13 A, VD = 400 V, IG = 100 mA, dIG/dt = 100 mA/µs, RL = 30 Ω; quadrants I - II - III",
          "source_page": 2,
          "source": "datasheet"
        },
        {
          "name": "On-state voltage",
          "symbol": "VTM",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 1.55,
          "conditions": "ITM = 35 A, tp = 380 µs, Tj = 25 °C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Threshold on-state voltage",
          "symbol": "VTO",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.85,
          "conditions": "Tj = 125 °C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Dynamic resistance",
          "symbol": "RD",
          "kind": "electrical",
          "unit": "mΩ",
          "min": null,
          "typ": null,
          "max": 20,
          "conditions": "Tj = 125 °C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Repetitive peak off-state current",
          "symbol": "IDRM/IRRM",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "VD = VR = 1200 V, Tj = 25 °C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Repetitive peak off-state current",
          "symbol": "IDRM/IRRM",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 6,
          "conditions": "VD = VR = 1200 V, Tj = 125 °C",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction to case (AC), TO-220AB insulated",
          "symbol": "Rth(j-c)",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": null,
          "max": 1.7,
          "conditions": "AC",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Junction to ambient, TO-220AB / TO-220AB ins",
          "symbol": "Rth(j-a)",
          "kind": "thermal",
          "unit": "°C/W",
          "min": null,
          "typ": 60,
          "max": null,
          "conditions": "",
          "source_page": 3,
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        }
      ]
    }
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  "author": {
    "name": "Ray",
    "email": "[email protected]"
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