SLM1302

{
  "schema_version": 1,
  "type": "component",
  "slug": "slm1302",
  "title": "SLM1302",
  "brief": "SOLA IC Real-time Clocks (RTC), SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "rtc",
    "slm1302"
  ],
  "component": {
    "mpn": "SLM1302",
    "manufacturer": "SOLA IC",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "RTC",
    "subcategory": "Real-time Clocks (RTC)",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/b1cc275dd463ca962a342bc4b4466d01.pdf",
    "parts": {
      "symbol": "slm1302.kicad_sym",
      "footprint": "slm1302.kicad_mod",
      "model_3d": "slm1302-etched.glb",
      "model_3d_plain": "slm1302.glb",
      "model_3d_step": "slm1302-etched.step",
      "model_3d_step_plain": "slm1302.step",
      "lbr": "slm1302.lbr"
    },
    "distributor_links": {
      "lcsc": "C125188"
    },
    "pins": [
      {
        "number": "1",
        "name": "VCC2",
        "type": "power_in",
        "description": "Primary/main power supply input (typically the backup or trickle-charged supply). Operating range 2.0 V to 5.5 V. Connects through the internal power-control block along with VCC1."
      },
      {
        "number": "2",
        "name": "X1",
        "type": "input",
        "description": "32.768 kHz crystal input. Connect one terminal of an external 32.768 kHz crystal here; drives the internal oscillator and divider that clocks the real-time counter."
      },
      {
        "number": "3",
        "name": "X2",
        "type": "output",
        "description": "32.768 kHz crystal output. Connect the other terminal of the external 32.768 kHz crystal here to complete the oscillator loop."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference. All voltages are referenced to this pin (-0.5 V to 7.0 V absolute-max on any other pin relative to GND)."
      },
      {
        "number": "5",
        "name": "RST",
        "type": "input",
        "description": "Active-low reset / chip enable (shown with overline in the datasheet). Driving RST high initiates a data transfer and enables the shift register for address/command; driving it low terminates the transfer and places I/O in high-impedance. At power-up RST must be held low until VCC > 2.0 V."
      },
      {
        "number": "6",
        "name": "I/O",
        "type": "bidirectional",
        "description": "Serial data line. Bidirectional command/address/data pin used with SCLK to shift bytes in (write) or out (read). Goes to high-impedance when RST is low. Logic-1 output guaranteed 1.6 V @ VCC=2 V, 2.4 V @ VCC=5 V; leakage up to 500 uA."
      },
      {
        "number": "7",
        "name": "SCLK",
        "type": "input",
        "description": "Serial clock input from the host MCU. Data on I/O is sampled on the rising edge and shifted out on the falling edge. Max clock frequency 0.5 MHz @ VCC=2 V, 2 MHz @ VCC=5 V."
      },
      {
        "number": "8",
        "name": "VCC1",
        "type": "power_in",
        "description": "Secondary power supply input (typically the trickle-charged/backup battery rail; can be swapped with VCC2 depending on system design). Operating range 2.0 V to 5.5 V. Internal power-control block selects the higher of VCC1/VCC2."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/b1cc275dd463ca962a342bc4b4466d01.pdf",
        "pages": 12,
        "sha256": "5a4d6145cbd1de79",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "slm1302.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "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)"
      },
      {
        "file": "slm1302-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d8cd7b5c923bce404e4821527f47b694707e749e5c85e1426834e4660e8dacc6",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "SOLA IC",
      "Package": "SOIC-8",
      "Category": "RTC",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "slm1302"
  ],
  "discovery_pitch": "SLM1302 (SOLA IC) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "slm1302.kicad_sym",
    "slm1302.kicad_mod",
    "slm1302.glb",
    "slm1302.step",
    "slm1302-etched.step",
    "slm1302.lbr",
    "docs/hero.png",
    "docs/slm1302-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-25T06:13:50.507Z"
}