ML51FB9AE

{
  "schema_version": 1,
  "type": "component",
  "slug": "ml51fb9ae",
  "title": "ML51FB9AE",
  "brief": "Nuvoton Tech Microcontrollers (MCU/MPU/SOC), TSSOP-20. 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",
    "embedded processors & controllers",
    "ml51fb9ae",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "ML51FB9AE",
    "manufacturer": "Nuvoton Tech",
    "package": "TSSOP-20",
    "pin_count": 20,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589838952233263104",
    "parts": {
      "symbol": "ml51fb9ae.kicad_sym",
      "footprint": "ml51fb9ae.kicad_mod",
      "model_3d": "ml51fb9ae-hero.glb",
      "model_3d_plain": "ml51fb9ae-etched.glb",
      "model_3d_step": "ml51fb9ae-etched.step",
      "model_3d_step_plain": "ml51fb9ae.step",
      "lbr": "ml51fb9ae.lbr"
    },
    "distributor_links": {
      "lcsc": "C2997671",
      "digikey": "816-ML51FB9AE-ND",
      "mouser": "503-ML51FB9AE"
    },
    "distributor_check": {
      "checked_at": "2026-10-19T01:21:57Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "816-ML51FB9AE-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "503-ML51FB9AE",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground pin for the device; the datasheet requires all VSS pins to be connected to the external supply ground."
      },
      {
        "number": "2",
        "name": "P4.6 / PWM0_CH0 / T0 / CLKO / INT0",
        "type": "bidirectional",
        "description": "General-purpose I/O port P4.6, multiplexed with PWM0_CH0, T0, CLKO and INT0; after reset all GPIO pins are in input mode and are configured through the PxMx registers."
      },
      {
        "number": "3",
        "name": "VDD",
        "type": "power_in",
        "description": "Positive supply pin; the datasheet gives an operating voltage of 1.8 V to 5.5 V and recommends VDD and AVDD be supplied from the same source."
      },
      {
        "number": "4",
        "name": "P3.2 / ADC_CH7 / ACMP1_N1 / SPI1_CLK / IC1 / CLKO",
        "type": "bidirectional",
        "description": "General-purpose I/O port P3.2, multiplexed with ADC input channel 7, comparator 1 negative input 1, SPI1 clock, input capture channel 1 and CLKO; after reset it is in input mode."
      },
      {
        "number": "5",
        "name": "P3.1 / ADC_CH6 / ACMP0_P3 / ACMP1_P3 / SPI1_MISO / UART0_TXD / IC2",
        "type": "bidirectional",
        "description": "General-purpose I/O port P3.1, multiplexed with ADC input channel 6, comparator positive inputs, SPI1 MISO, UART0 TXD and input capture channel 2; after reset it is in input mode."
      },
      {
        "number": "6",
        "name": "P3.0 / SPI1_MOSI / UART0_RXD / IC0",
        "type": "bidirectional",
        "description": "General-purpose I/O port P3.0, multiplexed with SPI1 MOSI, UART0 RXD and input capture channel 0; after reset it is in input mode."
      },
      {
        "number": "7",
        "name": "VREF",
        "type": "power_in",
        "description": "External reference voltage pin for the ADC/analog circuitry as shown in the block diagram; the datasheet gives no further electrical limits for this pin."
      },
      {
        "number": "8",
        "name": "P2.5 / ADC_CH0 / I2C0_SCL / PWM0_CH0 / UART2_TXD / T0 / INT0",
        "type": "bidirectional",
        "description": "General-purpose I/O port P2.5, multiplexed with ADC input channel 0, I2C0 clock, PWM0 channel 0, UART2 TXD, T0 and INT0; after reset it is in input mode."
      },
      {
        "number": "9",
        "name": "P2.4 / ADC_CH1 / I2C0_SDA / PWM0_CH1 / UART2_RXD / T1 / INT1",
        "type": "bidirectional",
        "description": "General-purpose I/O port P2.4, multiplexed with ADC input channel 1, I2C0 data, PWM0 channel 1, UART2 RXD, T1 and INT1; after reset it is in input mode."
      },
      {
        "number": "10",
        "name": "P2.3 / ADC_CH2 / I2C1_SCL / UART1_TXD / PWM0_CH2 / PWM0_BRAKE",
        "type": "bidirectional",
        "description": "General-purpose I/O port P2.3, multiplexed with ADC input channel 2, I2C1 clock, UART1 TXD, PWM0 channel 2 and PWM0 brake input; after reset it is in input mode."
      },
      {
        "number": "11",
        "name": "P2.2 / ADC_CH3 / I2C1_SDA / UART1_RXD / PWM0_CH3",
        "type": "bidirectional",
        "description": "General-purpose I/O port P2.2, multiplexed with ADC input channel 3, I2C1 data, UART1 RXD and PWM0 channel 3; after reset it is in input mode."
      },
      {
        "number": "12",
        "name": "P5.3 / UART0_TXD / I2C0_SCL / XT1_IN",
        "type": "bidirectional",
        "description": "General-purpose I/O port P5.3, multiplexed with UART0 TXD, I2C0 clock and the XT1_IN external 4-24 MHz crystal input; after reset it is in input mode."
      },
      {
        "number": "13",
        "name": "P5.2 / UART0_RXD / I2C0_SDA / XT1_OUT",
        "type": "bidirectional",
        "description": "General-purpose I/O port P5.2, multiplexed with UART0 RXD, I2C0 data and the XT1_OUT external 4-24 MHz crystal output; after reset it is in input mode."
      },
      {
        "number": "14",
        "name": "P0.3 / SPI1_SS / UART1_TXD / I2C1_SCL / STADC / PWM0_CH2",
        "type": "bidirectional",
        "description": "General-purpose I/O port P0.3, multiplexed with SPI1 slave select, UART1 TXD, I2C1 clock, the ADC external trigger STADC and PWM0 channel 2; after reset it is in input mode."
      },
      {
        "number": "15",
        "name": "P0.2 / SPI1_CLK / UART1_RXD / I2C1_SDA / PWM0_CH3",
        "type": "bidirectional",
        "description": "General-purpose I/O port P0.2, multiplexed with SPI1 clock, UART1 RXD, I2C1 data and PWM0 channel 3; after reset it is in input mode."
      },
      {
        "number": "16",
        "name": "P0.1 / SPI1_MISO / UART0_TXD / PWM0_CH4",
        "type": "bidirectional",
        "description": "General-purpose I/O port P0.1, multiplexed with SPI1 MISO, UART0 TXD and PWM0 channel 4; after reset it is in input mode."
      },
      {
        "number": "17",
        "name": "P0.0 / SPI1_MOSI / UART0_RXD / PWM0_CH5",
        "type": "bidirectional",
        "description": "General-purpose I/O port P0.0, multiplexed with SPI1 MOSI, UART0 RXD and PWM0 channel 5; after reset it is in input mode."
      },
      {
        "number": "18",
        "name": "nRESET",
        "type": "input",
        "description": "Active-low external reset input with an internal pull-up resistor; driving it low places the MCU in the reset state."
      },
      {
        "number": "19",
        "name": "P5.0 / UART1_TXD / I2C1_SCL / UART0_TXD / ICE_DAT",
        "type": "bidirectional",
        "description": "General-purpose I/O port P5.0, multiplexed with UART1 TXD, I2C1 clock, UART0 TXD and the ICE_DAT serial debug data pin; after reset it is in input mode."
      },
      {
        "number": "20",
        "name": "P5.1 / UART1_RXD / I2C1_SDA / UART0_RXD / ICE_CLK",
        "type": "bidirectional",
        "description": "General-purpose I/O port P5.1, multiplexed with UART1 RXD, I2C1 data, UART0 RXD and the ICE_CLK serial debug clock pin; after reset it is in input mode."
      }
    ],
    "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: VREF is listed by name only in the TSSOP20 pin table (page 31) and shown as 'External VREF' in the b; Page 31 gives only the pin name and the multiplexed table entry; the active-low behaviour and intern; The datasheet recommends a 100 kΩ pull-up on ICE_CLK and ICE_DAT (page 38); this is not included in "
        ],
        "pages_sent": 67,
        "cost_usd": 0.2779,
        "at": "2026-10-19T01:20:05"
      },
      "datasheet": {
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        "pages": 85,
        "sha256": "8232f8f756941f1b",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          6.5,
          1.2
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "97339947f3a7196470ec2f1d9f9b92bb2fc2ab66ad53be0cf105192585ef3c9a",
        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ml51fb9ae-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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        "checked": "2026-10-19",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Nuvoton Tech",
      "Package": "TSSOP-20",
      "Category": "Embedded Processors & Controllers",
      "Pins": "20"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "8232f8f756941f1bcaabd058156ab88597978fb56c45018b45ee9ea1ca375dca",
      "rows": [
        {
          "name": "Operating temperature",
          "symbol": "TA",
          "kind": "recommended_operating",
          "unit": "℃",
          "min": -40,
          "typ": null,
          "max": 105,
          "conditions": "",
          "source_page": 47,
          "source": "datasheet"
        },
        {
          "name": "Operating voltage",
          "symbol": "VDD",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.8,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 47,
          "source": "datasheet"
        },
        {
          "name": "DC supply voltage VDD-VSS",
          "symbol": "VDD-VSS",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 69,
          "source": "datasheet"
        },
        {
          "name": "Variation between different VDD pins",
          "symbol": "ΔVDD",
          "kind": "absolute_maximum",
          "unit": "mV",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "",
          "source_page": 69,
          "source": "datasheet"
        },
        {
          "name": "Allowed difference VDD to AVDD",
          "symbol": "|VDD–AVDD|",
          "kind": "absolute_maximum",
          "unit": "mV",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "",
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        {
          "name": "Variation between different VSS pins",
          "symbol": "ΔVSS",
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          "unit": "mV",
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          "max": 50,
          "conditions": "",
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        },
        {
          "name": "Allowed difference VSS to AVSS",
          "symbol": "|VSS - AVSS|",
          "kind": "absolute_maximum",
          "unit": "mV",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "",
          "source_page": 69,
          "source": "datasheet"
        },
        {
          "name": "I/O input voltage (5 V tolerant)",
          "symbol": "VIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 5.5,
          "conditions": "",
          "source_page": 69,
          "source": "datasheet"
        },
        {
          "name": "Maximum VSS output current",
          "symbol": "ΣISS",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 70,
          "source": "datasheet"
        },
        {
          "name": "Maximum sink current, single pin",
          "symbol": "IIO",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 20,
          "conditions": "",
          "source_page": 70,
          "source": "datasheet"
        },
        {
          "name": "Maximum source current, single pin",
          "symbol": "IIO",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 20,
          "conditions": "",
          "source_page": 70,
          "source": "datasheet"
        },
        {
          "name": "Maximum sum of sink currents, all pins",
          "symbol": "IIO",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 70,
          "source": "datasheet"
        },
        {
          "name": "Maximum sum of output currents, all pins",
          "symbol": "IIO",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 100,
          "conditions": "",
          "source_page": 70,
          "source": "datasheet"
        },
        {
          "name": "nRESET internal pull-up resistance",
          "symbol": "RRST",
          "kind": "electrical",
          "unit": "KΩ",
          "min": 45,
          "typ": null,
          "max": 60,
          "conditions": "VDD = 5.5 V",
          "source_page": 55,
          "source": "datasheet"
        },
        {
          "name": "nRESET internal pull-up resistance",
          "symbol": "RRST",
          "kind": "electrical",
          "unit": "KΩ",
          "min": 50,
          "typ": null,
          "max": 65,
          "conditions": "VDD = 1.8 V",
          "source_page": 55,
          "source": "datasheet"
        },
        {
          "name": "nRESET input filter pulse time, power-down mode",
          "symbol": "tFR",
          "kind": "timing",
          "unit": "µs",
          "min": 10,
          "typ": null,
          "max": 25,
          "conditions": "掉电模式 (power-down mode)",
          "source_page": 55,
          "source": "datasheet"
        },
        {
          "name": "24 MHz HIRC output frequency",
          "symbol": "fHRC",
          "kind": "electrical",
          "unit": "MHz",
          "min": 23.76,
          "typ": 24,
          "max": 24.24,
          "conditions": "",
          "source_page": 56,
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        },
        {
          "name": "24 MHz HIRC frequency accuracy",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "TA = 25 °C, VDD = 5V",
          "source_page": 56,
          "source": "datasheet"
        },
        {
          "name": "24 MHz HIRC frequency accuracy",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": -2,
          "typ": null,
          "max": 2,
          "conditions": "TA = 25 °C, VDD = 3.3V",
          "source_page": 56,
          "source": "datasheet"
        },
        {
          "name": "24 MHz HIRC frequency accuracy",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": -5,
          "typ": null,
          "max": 5,
          "conditions": "TA = -20°C ~ +105 °C, VDD = 1.8 ~ 5.5V",
          "source_page": 56,
          "source": "datasheet"
        },
        {
          "name": "24 MHz HIRC operating current",
          "symbol": "IHRC",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 490,
          "max": 550,
          "conditions": "",
          "source_page": 56,
          "source": "datasheet"
        },
        {
          "name": "24 MHz HIRC stabilization time",
          "symbol": "TS",
          "kind": "timing",
          "unit": "µs",
          "min": null,
          "typ": 3,
          "max": 5,
          "conditions": "TA = -40°C ~ +105 °C, VDD = 1.8 ~ 5.5V",
          "source_page": 56,
          "source": "datasheet"
        },
        {
          "name": "38.4 kHz LIRC frequency accuracy",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": -2,
          "typ": null,
          "max": 2,
          "conditions": "TA = 25 °C, VDD = 5V",
          "source_page": 57,
          "source": "datasheet"
        },
        {
          "name": "38.4 kHz LIRC frequency accuracy",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": -15,
          "typ": null,
          "max": 15,
          "conditions": "TA=-40~105°C, VDD=1.8V~5.5V, Without software calibration",
          "source_page": 57,
          "source": "datasheet"
        },
        {
          "name": "38.4 kHz LIRC operating current",
          "symbol": "ILRC",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 0.85,
          "max": 1,
          "conditions": "VDD = 3.3V",
          "source_page": 57,
          "source": "datasheet"
        },
        {
          "name": "Flash LDO supply (VFLA)",
          "symbol": "VFLA",
          "kind": "electrical",
          "unit": "V",
          "min": 1.35,
          "typ": 1.5,
          "max": 1.65,
          "conditions": "TA = 25℃",
          "source_page": 68,
          "source": "datasheet"
        },
        {
          "name": "Flash endurance (program/erase cycles)",
          "symbol": "NENDUR",
          "kind": "electrical",
          "unit": "cycles",
          "min": 100000,
          "typ": null,
          "max": null,
          "conditions": "TJ = -40℃~125℃",
          "source_page": 68,
          "source": "datasheet"
        },
        {
          "name": "Flash data retention",
          "symbol": "TRET",
          "kind": "electrical",
          "unit": "year",
          "min": 50,
          "typ": null,
          "max": null,
          "conditions": "100 kcycle, TA = 55℃",
          "source_page": 68,
          "source": "datasheet"
        },
        {
          "name": "Flash data retention",
          "symbol": "TRET",
          "kind": "electrical",
          "unit": "year",
          "min": 25,
          "typ": null,
          "max": null,
          "conditions": "100 kcycle, TA = 85℃",
          "source_page": 68,
          "source": "datasheet"
        },
        {
          "name": "Flash data retention",
          "symbol": "TRET",
          "kind": "electrical",
          "unit": "year",
          "min": 10,
          "typ": null,
          "max": null,
          "conditions": "100 kcycle, TA = 105℃",
          "source_page": 68,
          "source": "datasheet"
        },
        {
          "name": "External analog reference voltage (upper limit AVDD)",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 1.8,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 67,
          "source": "datasheet"
        },
        {
          "name": "External analog reference voltage, VRFSEL[2:0] = 001",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 2.018,
          "typ": 2.048,
          "max": 2.078,
          "conditions": "TA = 25°C",
          "source_page": 67,
          "source": "datasheet"
        },
        {
          "name": "External analog reference voltage, VRFSEL[2:0] = 011",
          "symbol": "VREF",
          "kind": "electrical",
          "unit": "V",
          "min": 3.042,
          "typ": 3.072,
          "max": 3.102,
          "conditions": "TA = 25°C",
          "source_page": 67,
          "source": "datasheet"
        },
        {
          "name": "Band-gap voltage",
          "symbol": "VBG",
          "kind": "electrical",
          "unit": "V",
          "min": 0.793,
          "typ": 0.814,
          "max": 0.835,
          "conditions": "TA = -40°C ~105 °C",
          "source_page": 67,
          "source": "datasheet"
        },
        {
          "name": "Normal run, 24 MHz (HIRC), peripherals disabled",
          "symbol": "IDD_RUN",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 2.4,
          "max": 2.9,
          "conditions": "正常运行模式，运行在 Flash，所有外设禁用; max at TA = 105 °C; VDD = AVDD = 3.3 V",
          "source_page": 48,
          "source": "datasheet"
        },
        {
          "name": "Normal run, 24 MHz (HXT), peripherals disabled",
          "symbol": "IDD_RUN",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 2.52,
          "max": 3.16,
          "conditions": "正常运行模式，运行在 Flash，所有外设禁用; max at TA = 105 °C; VDD = AVDD = 3.3 V",
          "source_page": 48,
          "source": "datasheet"
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