ISO1211

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  "schema_version": 1,
  "type": "component",
  "slug": "iso1211",
  "title": "ISO1211",
  "brief": "TI isolated 24 V digital-input receiver, SOIC-8. IEC 61131-2 Type 1/3, single resistor sets current. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "digital-input",
    "industrial",
    "iec-61131",
    "soic-8",
    "texas-instruments"
  ],
  "component": {
    "mpn": "ISO1211",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Interface",
    "subcategory": "Isolated digital input",
    "datasheet": "https://www.ti.com/lit/ds/symlink/iso1211.pdf",
    "parts": {
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      "footprint": "iso1211.kicad_mod",
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "VCC1",
        "type": "power_in",
        "description": "Power supply, side 1 (logic/controller side). Operating range 2.25V to 5.5V; supports 2.5V, 3.3V, and 5V controllers. Absolute max 6V."
      },
      {
        "number": "2",
        "name": "EN",
        "type": "input",
        "description": "Output enable. OUT is enabled when EN is high or open; OUT is high-impedance when EN is low. In noisy applications, tie EN to VCC1."
      },
      {
        "number": "3",
        "name": "OUT",
        "type": "output",
        "description": "Channel output (logic-side digital output representing the field-side input state). Push-pull, referenced to VCC1/GND1. IOH up to -4mA (VCC1=5V); IOL up to 4mA (VCC1=5V)."
      },
      {
        "number": "4",
        "name": "GND1",
        "type": "power_in",
        "description": "Ground connection for VCC1 (logic/controller side ground reference)."
      },
      {
        "number": "5",
        "name": "SUB",
        "type": "passive",
        "description": "Internal connection to input chip substrate. For good thermal performance, connect this pin to a small 2mm x 2mm floating plane on the board. Do NOT connect this floating plane to FGND or any other signal or plane."
      },
      {
        "number": "6",
        "name": "FGND",
        "type": "power_in",
        "description": "Field-side ground reference for the isolated field input."
      },
      {
        "number": "7",
        "name": "IN",
        "type": "input",
        "description": "Field-side current input. Accepts 9V to 300V DC/AC digital input signals through an external current-limit resistor; ±60V absolute rating with reverse polarity protection."
      },
      {
        "number": "8",
        "name": "SENSE",
        "type": "input",
        "description": "Field-side voltage sense pin. Used together with IN pin and external resistors to set the accurate current limit for IEC 61131-2 Type 1/2/3 compliance. Minimum pulse width at SENSE is 150ns."
      }
    ],
    "provenance": {
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      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/iso1211.pdf",
        "pages": 47,
        "sha256": "41e0bc7308dd4e0c",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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        "extents_mm": [
          6,
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
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        "file": "iso1211-etched.step",
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    ]
  },
  "metadata": {
    "specs": {
      "Type": "Digital-input receiver (24 V field)",
      "Standard": "IEC 61131-2 Type 1 / 2 / 3",
      "Current setting": "Single external resistor",
      "Input": "Defined thresholds + hysteresis",
      "Output": "Logic level (OUT)",
      "Supply": "2.25-5.5 V (logic side)",
      "Package": "SOIC-8"
    }
  },
  "sections": [
    "hero",
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    "info"
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  "discovery_triggers": [
    "iso1211",
    "digital input receiver",
    "24v plc input",
    "iec 61131 input"
  ],
  "discovery_pitch": "TI ISO1211 isolated 24 V digital-input receiver (SOIC-8) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
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  "variants": [
    {
      "mpn": "ISO1211DR (SOIC-8)",
      "kind": "packaging"
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      "mpn": "ISO1212DR (dual channel)",
      "kind": "unknown"
    }
  ]
}