JSM1302Z

{
  "schema_version": 1,
  "type": "component",
  "slug": "jsm1302z",
  "title": "JSM1302Z",
  "brief": "JSMSEMI Real-time Clocks (RTC), SOP-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "rtc",
    "jsm1302z"
  ],
  "component": {
    "mpn": "JSM1302Z",
    "manufacturer": "JSMSEMI",
    "package": "SOP-8",
    "pin_count": 8,
    "category": "RTC",
    "subcategory": "Real-time Clocks (RTC)",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2401051656_JSMSEMI-JSM1302Z_C2997447.pdf",
    "parts": {
      "symbol": "jsm1302z.kicad_sym",
      "footprint": "jsm1302z.kicad_mod",
      "model_3d": "jsm1302z-etched.glb",
      "model_3d_plain": "jsm1302z.glb",
      "model_3d_step": "jsm1302z-etched.step",
      "model_3d_step_plain": "jsm1302z.step",
      "lbr": "jsm1302z.lbr"
    },
    "distributor_links": {
      "lcsc": "C2997447"
    },
    "pins": [
      {
        "number": "1",
        "name": "VCC2",
        "type": "power_in",
        "description": "Primary power supply input (main Vcc). Recommended operating voltage 2.0 V to 5.5 V. When VCC2 exceeds VCC1 + 0.2 V, the device is powered from VCC2 and can source trickle-charge current to VCC1."
      },
      {
        "number": "2",
        "name": "X1",
        "type": "passive",
        "description": "32.768 kHz crystal oscillator connection. Connect a 32.768 kHz crystal between X1 and X2; the crystal's specified load capacitance (CL) should be 6 pF."
      },
      {
        "number": "3",
        "name": "X2",
        "type": "passive",
        "description": "32.768 kHz crystal oscillator connection. Connect a 32.768 kHz crystal between X1 and X2; the crystal's specified load capacitance (CL) should be 6 pF."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V) for the device."
      },
      {
        "number": "5",
        "name": "RST",
        "type": "input",
        "description": "Active-low reset / chip-enable input (labeled with overline on datasheet). Must be driven high to initiate any data transfer and held high for the entire transaction; a low level aborts the transfer and forces the I/O pin to high-impedance. TTL-compatible (VIH ≥ 2.0 V, VIL ≤ +0.8 V at VCC=5 V)."
      },
      {
        "number": "6",
        "name": "I/O",
        "type": "bidirectional",
        "description": "Serial data input/output pin of the 3-wire interface. Data is clocked in on the rising edge of SCLK and clocked out on the falling edge. Pin goes to high-impedance when RST is low. I/O capacitance is 15 pF typical; leakage up to 500 µA."
      },
      {
        "number": "7",
        "name": "SCLK",
        "type": "input",
        "description": "Serial clock input for the 3-wire interface, driven by the host microcontroller. Synchronizes data transfers on the I/O pin. Maximum clock frequency 0.5 MHz at VCC=2.5 V and 2.0 MHz at VCC=5 V (DC minimum)."
      },
      {
        "number": "8",
        "name": "VCC1",
        "type": "power_in",
        "description": "Backup power supply input (typically a battery or supercapacitor for timekeeping retention). Also acts as the output of the internal programmable trickle charger sourced from VCC2. When VCC2 + 0.2 V < VCC1, the device is powered from VCC1."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2401051656_JSMSEMI-JSM1302Z_C2997447.pdf",
        "pages": 13,
        "sha256": "6953abaf7cde3cb8",
        "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": "jsm1302z.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": "jsm1302z-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": "6edc62cd31bad9234c3761f8cfb92cd32264f809f42aead137308b22b11df630",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "JSMSEMI",
      "Package": "SOP-8",
      "Category": "RTC",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "jsm1302z"
  ],
  "discovery_pitch": "JSM1302Z (JSMSEMI) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "jsm1302z.kicad_sym",
    "jsm1302z.kicad_mod",
    "jsm1302z.glb",
    "jsm1302z.step",
    "jsm1302z-etched.step",
    "jsm1302z.lbr",
    "docs/hero.png",
    "docs/jsm1302z-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "JSM1302ZZ/TR",
      "kind": "packaging"
    },
    {
      "mpn": "JSM1302ZN",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-24T23:14:11.994Z"
}