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Ray Set visibility: public ddede06 7d ago
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{
  "schema_version": 1,
  "type": "component",
  "slug": "mcp79400t-i",
  "title": "MCP79400T-I",
  "brief": "Microchip Tech Real Time Clocks, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "clock-timing",
    "mcp79400t-i",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "MCP79400T-I",
    "manufacturer": "Microchip Tech",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Clock/Timing",
    "subcategory": "Real Time Clocks",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589798933121048576",
    "parts": {
      "symbol": "mcp79400t-i.kicad_sym",
      "footprint": "mcp79400t-i.kicad_mod",
      "model_3d": "mcp79400t-i-hero.glb",
      "model_3d_plain": "mcp79400t-i-etched.glb",
      "model_3d_step": "mcp79400t-i-etched.step",
      "model_3d_step_plain": "mcp79400t-i.step",
      "lbr": "mcp79400t-i.lbr"
    },
    "distributor_links": {
      "lcsc": "C623881"
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    "distributor_check": {
      "checked_at": "2026-10-21T01:35:12Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
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    },
    "pins": [
      {
        "number": "1",
        "name": "X1",
        "type": "input",
        "description": "Crystal oscillator input for a 32.768 kHz tuning-fork crystal with external load capacitors, optimized for crystals with 6-9 pF load capacitance; it also serves as the external clock input when the device is configured for an external oscillator."
      },
      {
        "number": "2",
        "name": "X2",
        "type": "output",
        "description": "Crystal oscillator output for the 32.768 kHz crystal; it must be left floating when an external 32.768 kHz clock is applied to X1."
      },
      {
        "number": "3",
        "name": "VBAT",
        "type": "power_in",
        "description": "Backup supply input that maintains the RTCC and SRAM when VCC is unavailable; connect to VSS if battery backup is not used."
      },
      {
        "number": "4",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground reference for the device."
      },
      {
        "number": "5",
        "name": "SDA",
        "type": "bidirectional",
        "description": "Open-drain bidirectional I2C serial data line that requires a pull-up resistor to VCC (typically 10 kΩ for 100 kHz or 2 kΩ for 400 kHz), and may change only while SCL is low except for Start and Stop conditions."
      },
      {
        "number": "6",
        "name": "SCL",
        "type": "input",
        "description": "I2C serial clock input that synchronizes data transfer to and from the device."
      },
      {
        "number": "7",
        "name": "MFP",
        "type": "output",
        "description": "Open-drain multifunction output for alarm, square-wave, or general-purpose output that requires a pull-up resistor to VCC (typically 10 kΩ) and may be left floating if unused."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Primary power supply input, with an operating voltage range of 1.8 V to 5.5 V as stated in the datasheet features list."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
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        "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 8-pin SOIC pinout is taken from Table 3-1 (page 8) and the package-types diagram (page 1); the S; The VCC operating range of 1.8 V to 5.5 V is stated on page 1 (Features), not on the pin-description"
        ],
        "pages_sent": 15,
        "cost_usd": 0.0608,
        "at": "2026-10-21T01:30:49"
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        "pages": 60,
        "sha256": "9dbb557d73a1b0be",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
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      "footprint": "viewers/footprint.html"
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        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-21",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "mcp79400t-i-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "sha256": "bd02508ec9692cf3daee44c7310a704c86bd74bf79120a18f4fdde122974027c",
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        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "SOIC-8",
      "Category": "Clock/Timing",
      "Pins": "8"
    },
    "appearance": {
      "contacts": {
        "quote": "8-Lead Plastic Small Outline (SN) - Narrow, 3.90 mm (.150 In.) Body [SOIC] A A2",
        "page": 44,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
      "datasheet_sha256": "9dbb557d73a1b0bed849f4b6de36d1ffb5437be2a243eb1eb80afce5aae76717"
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    "characteristics": {
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      "source": "datasheet",
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      "rows": [
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          "name": "Supply voltage (VCC) absolute maximum",
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          "kind": "absolute_maximum",
          "unit": "V",
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          "max": 6.5,
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        {
          "name": "All inputs and outputs (except SDA and SCL) w.r.t. VSS",
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        {
          "name": "SDA and SCL w.r.t. VSS",
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          "name": "ESD protection on all pins",
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          "conditions": "VCC ≥ 2.5V",
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        {
          "name": "Low-level input voltage (SDA, SCL)",
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          "name": "Hysteresis of Schmitt trigger inputs (SDA, SCL)",
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        {
          "name": "Low-level output voltage (MFP, SDA)",
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          "kind": "electrical",
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          "conditions": "IOL = 3.0 mA; VCC = 4.5V",
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        {
          "name": "Input leakage current",
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          "conditions": "VOUT = VSS or VCC",
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        {
          "name": "Pin capacitance (SDA, SCL, MFP)",
          "symbol": "CIN, COUT",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
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          "max": 10,
          "conditions": "VCC = 5.0V (Note 1); TA = 25°C, f = 1 MHz",
          "source_page": 3,
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        {
          "name": "EEPROM operating current (read)",
          "symbol": "ICCEERD",
          "kind": "electrical",
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          "typ": null,
          "max": 400,
          "conditions": "VCC = 5.5V, SCL = 400 kHz",
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        {
          "name": "EEPROM operating current (write)",
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          "kind": "electrical",
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          "conditions": "VCC = 5.5V",
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        {
          "name": "SRAM/RTCC register operating current (read)",
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          "conditions": "VCC = 5.5V, SCL = 400 kHz",
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        {
          "name": "SRAM/RTCC register operating current (write)",
          "symbol": "ICCWRITE",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
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          "max": 400,
          "conditions": "VCC = 5.5V, SCL = 400 kHz",
          "source_page": 3,
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        {
          "name": "VCC data-retention current (oscillator off)",
          "symbol": "ICCDAT",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
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          "conditions": "SCL, SDA, VCC = 5.5V",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Power-fail switchover voltage",
          "symbol": "VTRIP",
          "kind": "electrical",
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          "min": 1.3,
          "typ": 1.5,
          "max": 1.7,
          "conditions": "",
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        {
          "name": "Backup supply voltage range",
          "symbol": "VBAT",
          "kind": "electrical",
          "unit": "V",
          "min": 1.3,
          "typ": null,
          "max": 5.5,
          "conditions": "Note 1",
          "source_page": 3,
          "source": "datasheet"
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        {
          "name": "Timekeeping backup current",
          "symbol": "IBATT",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": null,
          "max": 850,
          "conditions": "VBAT = 1.3V, VCC = VSS (Note 1)",
          "source_page": 4,
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        {
          "name": "Timekeeping backup current",
          "symbol": "IBATT",
          "kind": "electrical",
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          "min": null,
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          "max": 1200,
          "conditions": "VBAT = 3.0V, VCC = VSS (Note 1)",
          "source_page": 4,
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        {
          "name": "Timekeeping backup current",
          "symbol": "IBATT",
          "kind": "electrical",
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          "min": null,
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          "max": 9000,
          "conditions": "VBAT = 5.5V, VCC = VSS (Note 1)",
          "source_page": 4,
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        {
          "name": "VBAT data-retention current (oscillator off)",
          "symbol": "IBATDAT",
          "kind": "electrical",
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          "min": null,
          "typ": null,
          "max": 750,
          "conditions": "VBAT = 3.6V, VCC = VSS",
          "source_page": 4,
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        {
          "name": "Clock frequency",
          "symbol": "FCLK",
          "kind": "timing",
          "unit": "kHz",
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          "max": 100,
          "conditions": "1.8V ≤ VCC < 2.5V",
          "source_page": 5,
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        {
          "name": "Clock frequency",
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          "conditions": "2.5V ≤ VCC ≤ 5.5V",
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        {
          "name": "Clock high time",
          "symbol": "THIGH",
          "kind": "timing",
          "unit": "ns",
          "min": 4000,
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          "conditions": "1.8V ≤ VCC < 2.5V",
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        {
          "name": "Clock high time",
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          "kind": "timing",
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          "min": 600,
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        {
          "name": "Clock low time",
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          "kind": "timing",
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          "typ": null,
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        {
          "name": "Clock low time",
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          "kind": "timing",
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        {
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          "conditions": "2.5V ≤ VCC ≤ 5.5V",
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        {
          "name": "Start condition hold time",
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          "conditions": "1.8V ≤ VCC < 2.5V",
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        {
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          "typ": null,
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          "conditions": "2.5V ≤ VCC ≤ 5.5V",
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        {
          "name": "Start condition setup time",
          "symbol": "TSU:STA",
          "kind": "timing",
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          "typ": null,
          "max": null,
          "conditions": "1.8V ≤ VCC < 2.5V",
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