NUC123LD4AN0

{
  "slug": "nuc123ld4an0",
  "version": "0.1.0",
  "type": "component",
  "description": "Nuvoton Tech Microcontrollers (MCU/MPU/SOC), LQFP-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "embedded processors & controllers",
    "nuc123ld4an0",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "nuc123ld4an0.kicad_sym",
    "nuc123ld4an0.kicad_mod",
    "nuc123ld4an0.glb",
    "nuc123ld4an0.step",
    "nuc123ld4an0.lbr",
    "docs/hero.png",
    "docs/nuc123ld4an0-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "nuc123ld4an0-hero.glb",
    "nuc123ld4an0-hero.overlay.json",
    "nuc123ld4an0-etched.glb"
  ],
  "component": {
    "mpn": "NUC123LD4AN0",
    "manufacturer": "Nuvoton Tech",
    "package": "LQFP-48(7x7)",
    "pin_count": 48,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586182928291778560",
    "parts": {
      "symbol": "nuc123ld4an0.kicad_sym",
      "footprint": "nuc123ld4an0.kicad_mod",
      "model_3d": "nuc123ld4an0-hero.glb",
      "model_3d_plain": "nuc123ld4an0-etched.glb",
      "model_3d_step": "nuc123ld4an0-etched.step",
      "model_3d_step_plain": "nuc123ld4an0.step",
      "lbr": "nuc123ld4an0.lbr"
    },
    "distributor_links": {
      "lcsc": "C94619",
      "digikey": "NUC123LD4AN0-ND",
      "mouser": "503-NUC123LD4AN0"
    },
    "distributor_check": {
      "checked_at": "2026-10-20T04:57:22Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "NUC123LD4AN0-ND",
        "status": "found",
        "lifecycle": "Discontinued at DigiKey"
      },
      "mouser": {
        "pn": "503-NUC123LD4AN0",
        "status": "found",
        "lifecycle": "Not Recommended for New Designs"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PVSS",
        "type": "power_in",
        "description": "PLL ground pin."
      },
      {
        "number": "2",
        "name": "PB.8",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate function TM0 (Timer0 event counter input / toggle output)."
      },
      {
        "number": "3",
        "name": "PB.14",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate function INT0 (external interrupt 0 input)."
      },
      {
        "number": "4",
        "name": "PA.11",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI1_CLK (SPI1 serial clock), SPI2_MOSI0 (SPI2 1st MOSI) and I2C1_SCL (I2C1 clock)."
      },
      {
        "number": "5",
        "name": "PA.10",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI1_MISO0 (SPI1 1st MISO), SPI2_MISO0 (SPI2 1st MISO) and I2C1_SDA (I2C1 data input/output)."
      },
      {
        "number": "6",
        "name": "PB.4",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions UART1_RXD (UART1 data receiver input), SPI2_SS0 (SPI2 1st slave select) and SPI1_SS1 (SPI1 2nd slave select)."
      },
      {
        "number": "7",
        "name": "PB.5",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions UART1_TXD (UART1 data transmitter output) and SPI2_CLK (SPI2 serial clock)."
      },
      {
        "number": "8",
        "name": "PB.6",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions UART1_nRTS (UART1 request to send output) and SPI2_MOSI0 (SPI2 1st MOSI)."
      },
      {
        "number": "9",
        "name": "PB.7",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions UART1_nCTS (UART1 clear to send input) and SPI2_MISO0 (SPI2 1st MISO)."
      },
      {
        "number": "10",
        "name": "LDO_CAP",
        "type": "power_out",
        "description": "LDO output pin."
      },
      {
        "number": "11",
        "name": "VDD",
        "type": "power_in",
        "description": "Power supply for I/O ports and LDO source for internal PLL and digital function; voltage range is 2.5V ~ 5V."
      },
      {
        "number": "12",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "13",
        "name": "USB_VBUS",
        "type": "power_in",
        "description": "USB power supply from USB host or hub."
      },
      {
        "number": "14",
        "name": "USB_VDD33_CAP",
        "type": "power_out",
        "description": "USB internal power regulator 3.3V output, used as decoupling pin."
      },
      {
        "number": "15",
        "name": "USB_D-",
        "type": "bidirectional",
        "description": "USB differential signal D-."
      },
      {
        "number": "16",
        "name": "USB_D+",
        "type": "bidirectional",
        "description": "USB differential signal D+."
      },
      {
        "number": "17",
        "name": "PC.5",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI0_MOSI1 (SPI0 2nd MOSI) and UART0_TXD (UART0 data transmitter output)."
      },
      {
        "number": "18",
        "name": "PC.4",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI0_MISO1 (SPI0 2nd MISO) and UART0_RXD (UART0 data receiver input)."
      },
      {
        "number": "19",
        "name": "PC.3",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI0_MOSI0 (SPI0 1st MOSI) and I2S_DO (I2S data output)."
      },
      {
        "number": "20",
        "name": "PC.2",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI0_MISO0 (SPI0 1st MISO) and I2S_DI (I2S data input)."
      },
      {
        "number": "21",
        "name": "PC.1",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI0_CLK (SPI0 serial clock) and I2S_BCLK (I2S bit clock)."
      },
      {
        "number": "22",
        "name": "PC.0",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI0_SS0 (SPI0 1st slave select) and I2S_LRCLK (I2S left/right channel clock)."
      },
      {
        "number": "23",
        "name": "PB.10",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI0_SS1 (SPI0 2nd slave select) and TM2 (Timer2 event counter input / toggle output)."
      },
      {
        "number": "24",
        "name": "PB.9",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI1_SS1 (SPI1 2nd slave select) and TM1 (Timer1 event counter input / toggle output)."
      },
      {
        "number": "25",
        "name": "PC.13",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI1_MOSI1 (SPI1 2nd MOSI), PWM3 (PWM3 output / capture input) and CLKO (frequency divider output)."
      },
      {
        "number": "26",
        "name": "PC.12",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI1_MISO1 (SPI1 2nd MISO), PWM2 (PWM2 output / capture input) and I2S_MCLK (I2S master clock output)."
      },
      {
        "number": "27",
        "name": "PC.11",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate function SPI1_MOSI0 (SPI1 1st MOSI)."
      },
      {
        "number": "28",
        "name": "PC.10",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate function SPI1_MISO0 (SPI1 1st MISO)."
      },
      {
        "number": "29",
        "name": "PC.9",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate function SPI1_CLK (SPI1 serial clock)."
      },
      {
        "number": "30",
        "name": "PC.8",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate function SPI1_SS0 (SPI1 1st slave select)."
      },
      {
        "number": "31",
        "name": "PA.15",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions PWM3 (PWM3 output / capture input), I2S_MCLK (I2S master clock output) and CLKO (frequency divider output)."
      },
      {
        "number": "32",
        "name": "PA.14",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate function PWM2 (PWM2 output / capture input)."
      },
      {
        "number": "33",
        "name": "PA.13",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate function PWM1 (PWM1 output / capture input)."
      },
      {
        "number": "34",
        "name": "PA.12",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate function PWM0 (PWM0 output / capture input)."
      },
      {
        "number": "35",
        "name": "ICE_DAT",
        "type": "bidirectional",
        "description": "Serial wired debugger data pin."
      },
      {
        "number": "36",
        "name": "ICE_CLK",
        "type": "input",
        "description": "Serial wired debugger clock input pin."
      },
      {
        "number": "37",
        "name": "AVDD",
        "type": "power_in",
        "description": "Power supply for the internal analog circuit."
      },
      {
        "number": "38",
        "name": "PD.0",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions ADC0 (ADC channel 0 analog input) and SPI2_SS0 (SPI2 1st slave select)."
      },
      {
        "number": "39",
        "name": "PD.1",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI2_CLK (SPI2 serial clock), SPI0_SS1 (SPI0 2nd slave select) and ADC1 (ADC channel 1 analog input)."
      },
      {
        "number": "40",
        "name": "PD.2",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI2_MISO0 (SPI2 1st MISO), SPI0_MISO1 (SPI0 2nd MISO) and ADC2 (ADC channel 2 analog input)."
      },
      {
        "number": "41",
        "name": "PD.3",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions SPI2_MOSI0 (SPI2 1st MOSI), SPI0_MOSI1 (SPI0 2nd MOSI) and ADC3 (ADC channel 3 analog input)."
      },
      {
        "number": "42",
        "name": "PD.4",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions ADC4 (ADC channel 4 analog input) and SPI2_MISO1 (SPI2 2nd MISO)."
      },
      {
        "number": "43",
        "name": "PD.5",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions ADC5 (ADC channel 5 analog input) and SPI2_MOSI1 (SPI2 2nd MOSI)."
      },
      {
        "number": "44",
        "name": "PF.0",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate function XT1_OUT (external 4~24 MHz high speed crystal output)."
      },
      {
        "number": "45",
        "name": "PF.1",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate function XT1_IN (external 4~24 MHz high speed crystal input)."
      },
      {
        "number": "46",
        "name": "nRESET",
        "type": "input",
        "description": "External reset input: low active, set this pin low to reset the chip to initial state; with internal pull-up."
      },
      {
        "number": "47",
        "name": "PF.2",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions ADC6 (ADC channel 6 analog input), I2C0_SDA (I2C0 data input/output) and PS2_DAT (PS/2 data)."
      },
      {
        "number": "48",
        "name": "PF.3",
        "type": "bidirectional",
        "description": "General-purpose digital I/O; alternate functions ADC7 (ADC channel 7 analog input), I2C0_SCL (I2C0 clock) and PS2_CLK (PS/2 clock)."
      }
    ],
    "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: Pin 5 (PA.10) is printed as '5*' in the Pin Description table; the asterisk is not explained in the ; LQFP-48 pin numbers were taken from the LQFP48 column of the Pin Description table (pages 22-26) bec; Functions marked 'NUC123xxxAEx Only' (PWM0 on PC.8, PWM1 on PB.9) were excluded because NUC123LD4AN0"
        ],
        "pages_sent": 16,
        "cost_usd": 0.1117,
        "at": "2026-10-20T04:57:01"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586182928291778560",
        "pages": 99,
        "sha256": "ca512e4c313acc05",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 48,
        "described": 48,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "nuc123ld4an0.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9.0,
          9.0,
          1.5
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "9dea352d93177c2904afd7d7b68ea8855ce1ab691f69f8b3e13655600514b6bf",
        "checked": "2026-10-20",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "nuc123ld4an0-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9.0,
          9.0,
          1.5
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "4d42e4f9c8a5cd74b046ddf756c2ebd8a32c38545b4cfa358881f4c502293eef",
        "checked": "2026-10-20",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}