main
Ray Set visibility: public d95fe4e 16d ago
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734
{
  "schema_version": 1,
  "type": "component",
  "slug": "bu9873fj-gte2",
  "title": "BU9873FJ-GTE2",
  "brief": "ROHM Semicon Real-time Clocks (RTC), 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": [
    "component",
    "clock and timing",
    "bu9873fj-gte2",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "BU9873FJ-GTE2",
    "manufacturer": "ROHM Semicon",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Clock and Timing",
    "subcategory": "Real-time Clocks (RTC)",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/3b8968eebf7659c4a101b90f2d55beb0.pdf",
    "parts": {
      "symbol": "bu9873fj-gte2.kicad_sym",
      "footprint": "bu9873fj-gte2.kicad_mod",
      "model_3d": "bu9873fj-gte2-hero.glb",
      "model_3d_plain": "bu9873fj-gte2-etched.glb",
      "model_3d_step": "bu9873fj-gte2-etched.step",
      "model_3d_step_plain": "bu9873fj-gte2.step",
      "lbr": "bu9873fj-gte2.lbr"
    },
    "distributor_links": {
      "lcsc": "C2672591",
      "digikey": "BU9873FJ-GTE2TR-ND",
      "mouser": "755-BU9873FJ-GTE2"
    },
    "distributor_check": {
      "checked_at": "2026-10-27T06:49:38Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "BU9873FJ-GTE2TR-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "755-BU9873FJ-GTE2",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "32KOUT",
        "type": "output",
        "description": "The 32KOUT pin outputs a 32.768 kHz clock pulse under internal register control, is enabled from power-on at 0V, and is a CMOS push-pull output."
      },
      {
        "number": "2",
        "name": "SCL",
        "type": "input",
        "description": "The SCL pin inputs the clock pulses that synchronize data transfer on the SDA pin."
      },
      {
        "number": "3",
        "name": "SDA",
        "type": "bidirectional",
        "description": "The SDA pin inputs and outputs data for writing and reading, synchronized with SCL, and is an N-channel open-drain output."
      },
      {
        "number": "4",
        "name": "VSS",
        "type": "power_in",
        "description": "The VSS pin is the ground connection."
      },
      {
        "number": "5",
        "name": "INTRB",
        "type": "output",
        "description": "The INTRB pin outputs periodic or alarm interrupts (Alarm_A, Alarm_B) to the CPU, is disabled during power-on from 0V, and is an N-channel open-drain output."
      },
      {
        "number": "6",
        "name": "OSCOUT",
        "type": "passive",
        "description": "The OSCOUT pin connects to the 32.768 kHz crystal oscillator, as all other oscillation circuit components are integrated in the IC."
      },
      {
        "number": "7",
        "name": "OSCIN",
        "type": "passive",
        "description": "The OSCIN pin connects to the 32.768 kHz crystal oscillator, as all other oscillation circuit components are integrated in the IC."
      },
      {
        "number": "8",
        "name": "VDD",
        "type": "power_in",
        "description": "The VDD pin is the power supply connection, with a supply voltage of 1.8 to 5.5 V under operating conditions."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "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 MPN suffix FJ maps to SOP-J8 in the ordering table on page 3, so the package hint SOIC-8 was ove; Pin types for OSCIN and OSCOUT are assigned as passive because the datasheet describes them as cryst"
        ],
        "pages_sent": 9,
        "cost_usd": 0.0101,
        "at": "2026-10-27T06:49:19"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/3b8968eebf7659c4a101b90f2d55beb0.pdf",
        "pages": 40,
        "sha256": "3f85caedc14fe3fa",
        "source_tier": "mfr"
      },
      "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"
    },
    "models_3d": [
      {
        "file": "bu9873fj-gte2.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": "2026-10-27",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bu9873fj-gte2-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": "6c5a85d0465bcb632a623fa3ea934cd0345c3b1c468ced6bb7d3a3aa57f67733",
        "checked": "2026-10-27",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "ROHM Semicon",
      "Package": "SOIC-8",
      "Category": "Clock and Timing",
      "Pins": "8"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "3f85caedc14fe3fa0fffbe71c9a90839702a063384096a478892574261a720d6",
      "rows": [
        {
          "name": "Supply Voltage",
          "symbol": "VDD",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 6.5,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Terminal Voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": null,
          "conditions": "Max is VDD+0.3V and not over 6.5V; min not lower than -0.8V when pulse width is 50ns or less",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature",
          "symbol": "Tstg",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Operating Temperature",
          "symbol": "Topt",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Power Dissipation (SOP-J8)",
          "symbol": "Pd",
          "kind": "absolute_maximum",
          "unit": "W",
          "min": null,
          "typ": null,
          "max": 0.45,
          "conditions": "When using above Ta=25, decreased by 4.5mW/°C",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Supply Voltage",
          "symbol": "VDD",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.8,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Timekeeping Voltage",
          "symbol": "VCLK",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.45,
          "typ": null,
          "max": 5.5,
          "conditions": "For minimum time keeping voltage, CGOUT=CDOUT=0pF; CL=6pF to 12.5pF; max R1=80kΩ",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "Input Voltage",
          "symbol": "VIN",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": null,
          "conditions": "Max is VDD",
          "source_page": 4,
          "source": "datasheet"
        },
        {
          "name": "“H” Output Current",
          "symbol": "IOH",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": -0.5,
          "conditions": "32KOUT; VOH=VDD-0.5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "“L” Output Current1",
          "symbol": "IOL1",
          "kind": "electrical",
          "unit": "mA",
          "min": 1,
          "typ": null,
          "max": null,
          "conditions": "INTRB, 32KOUT; VOL1=0.4V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "“L” Output Current2",
          "symbol": "IOL2",
          "kind": "electrical",
          "unit": "mA",
          "min": 6,
          "typ": null,
          "max": null,
          "conditions": "SDA; VOL2=0.4V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Input Leakage Current",
          "symbol": "IILK",
          "kind": "electrical",
          "unit": "μA",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "SCL; VIN=5.5V or VSS, VDD=5.5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Output Off State Leakage Current",
          "symbol": "IOZ",
          "kind": "electrical",
          "unit": "μA",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "SDA, INTRB, 32KOUT; VOUT=5.5V or VSS, VDD=5.5V",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Standby Current (time keeping current)",
          "symbol": "IDD1",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": 0.4,
          "max": 0.6,
          "conditions": "VDD=3V, Topt=25°C, SCL, SDA=3V, CGOUT=CDOUT=0pF, Output=Open(Note1)",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Standby Current (time keeping current)",
          "symbol": "IDD2",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "VDD=3V, Topt=-40°C to +85°C, SCL, SDA=3V, CGOUT=CDOUT=0pF, Output=Open(Note1)",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Standby Current (time keeping current)",
          "symbol": "IDD3",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 1.35,
          "conditions": "VDD=5.5V, Topt=-40°C to +85°C, SCL, SDA=5.5V, CGOUT=CDOUT=0pF, Output=Open(Note1)",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "SCL Clock Frequency",
          "symbol": "fSCL",
          "kind": "timing",
          "unit": "kHz",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "VDD≥1.8V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "SCL Clock Frequency",
          "symbol": "fSCL",
          "kind": "timing",
          "unit": "kHz",
          "min": null,
          "typ": null,
          "max": 400,
          "conditions": "VDD≥2.5V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "SCL Clock “L” Time",
          "symbol": "tLOW",
          "kind": "timing",
          "unit": "μs",
          "min": 4.7,
          "typ": null,
          "max": null,
          "conditions": "VDD≥1.8V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "SCL Clock “L” Time",
          "symbol": "tLOW",
          "kind": "timing",
          "unit": "μs",
          "min": 1.3,
          "typ": null,
          "max": null,
          "conditions": "VDD≥2.5V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "SCL Clock “H” Time",
          "symbol": "tHIGH",
          "kind": "timing",
          "unit": "μs",
          "min": 4,
          "typ": null,
          "max": null,
          "conditions": "VDD≥1.8V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "SCL Clock “H” Time",
          "symbol": "tHIGH",
          "kind": "timing",
          "unit": "μs",
          "min": 0.6,
          "typ": null,
          "max": null,
          "conditions": "VDD≥2.5V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Start Condition Hold Time",
          "symbol": "tHD:STA",
          "kind": "timing",
          "unit": "μs",
          "min": 4,
          "typ": null,
          "max": null,
          "conditions": "VDD≥1.8V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Start Condition Hold Time",
          "symbol": "tHD:STA",
          "kind": "timing",
          "unit": "μs",
          "min": 0.6,
          "typ": null,
          "max": null,
          "conditions": "VDD≥2.5V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Stop Condition Setup Time",
          "symbol": "tSU:STO",
          "kind": "timing",
          "unit": "μs",
          "min": 4,
          "typ": null,
          "max": null,
          "conditions": "VDD≥1.8V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Stop Condition Setup Time",
          "symbol": "tSU:STO",
          "kind": "timing",
          "unit": "μs",
          "min": 0.6,
          "typ": null,
          "max": null,
          "conditions": "VDD≥2.5V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Start Condition Setup Time",
          "symbol": "tSU:STA",
          "kind": "timing",
          "unit": "μs",
          "min": 4.7,
          "typ": null,
          "max": null,
          "conditions": "VDD≥1.8V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Start Condition Setup Time",
          "symbol": "tSU:STA",
          "kind": "timing",
          "unit": "μs",
          "min": 0.6,
          "typ": null,
          "max": null,
          "conditions": "VDD≥2.5V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Data Setup Time",
          "symbol": "tSU:DAT",
          "kind": "timing",
          "unit": "ns",
          "min": 250,
          "typ": null,
          "max": null,
          "conditions": "VDD≥1.8V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Data Setup Time",
          "symbol": "tSU:DAT",
          "kind": "timing",
          "unit": "ns",
          "min": 100,
          "typ": null,
          "max": null,
          "conditions": "VDD≥2.5V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "“H” Data Hold Time",
          "symbol": "tHDH:DAT",
          "kind": "timing",
          "unit": "ns",
          "min": 0,
          "typ": null,
          "max": null,
          "conditions": "VDD≥1.8V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "“L” Data Hold Time",
          "symbol": "tHDL:DAT",
          "kind": "timing",
          "unit": "ns",
          "min": 35,
          "typ": null,
          "max": null,
          "conditions": "VDD≥1.8V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "SDA “L” Stable Time After Falling of SCL",
          "symbol": "tPL:DAT",
          "kind": "timing",
          "unit": "μs",
          "min": null,
          "typ": null,
          "max": 2,
          "conditions": "VDD≥1.8V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "SDA “L” Stable Time After Falling of SCL",
          "symbol": "tPL:DAT",
          "kind": "timing",
          "unit": "μs",
          "min": null,
          "typ": null,
          "max": 0.9,
          "conditions": "VDD≥2.5V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "SDA Off Stable Time After Falling of SCL",
          "symbol": "tPZ:DAT",
          "kind": "timing",
          "unit": "μs",
          "min": null,
          "typ": null,
          "max": 2,
          "conditions": "VDD≥1.8V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "SDA Off Stable Time After Falling of SCL",
          "symbol": "tPZ:DAT",
          "kind": "timing",
          "unit": "μs",
          "min": null,
          "typ": null,
          "max": 0.9,
          "conditions": "VDD≥2.5V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Rising Time of SCL and SDA (Input)",
          "symbol": "tR",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 1000,
          "conditions": "VDD≥1.8V; Not 100% TESTED; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Rising Time of SCL and SDA (Input)",
          "symbol": "tR",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 300,
          "conditions": "VDD≥2.5V; Not 100% TESTED; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Falling Time of SCL and SDA (Input)",
          "symbol": "tF",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 300,
          "conditions": "VDD≥1.8V; Not 100% TESTED; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Spike Width that can be Filtered",
          "symbol": "tSP",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "VDD≥1.8V; VSS=0V, Topt=-40°C to +85°C",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Internal Oscillation Capacitance 1",
          "symbol": "CG",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 10,
          "max": null,
          "conditions": "OSCIN",
          "source_page": 5,
          "source": "datasheet"
        },
        {
          "name": "Internal Oscillation Capacitance 2",
          "symbol": "CD",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 10,
          "max": null,
          "conditions": "OSCOUT",
          "source_page": 5,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "bu9873fj-gte2"
  ],
  "discovery_pitch": "BU9873FJ-GTE2 (ROHM Semicon) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "bu9873fj-gte2.kicad_sym",
    "bu9873fj-gte2.kicad_mod",
    "bu9873fj-gte2.glb",
    "bu9873fj-gte2.step",
    "bu9873fj-gte2.lbr",
    "docs/hero.png",
    "docs/bu9873fj-gte2-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "bu9873fj-gte2-hero.glb",
    "bu9873fj-gte2-hero.overlay.json",
    "bu9873fj-gte2-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}