component
M251LD2AE
Public Made by Adomby adom
Nuvoton Tech Microcontrollers (MCU/MPU/SOC), LQFP-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "m251ld2ae",
"title": "M251LD2AE",
"brief": "Nuvoton Tech Microcontrollers (MCU/MPU/SOC), LQFP-48(7x7). 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",
"m251ld2ae",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "M251LD2AE",
"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/8590207682197159936",
"parts": {
"symbol": "m251ld2ae.kicad_sym",
"footprint": "m251ld2ae.kicad_mod",
"model_3d": "m251ld2ae-hero.glb",
"model_3d_plain": "m251ld2ae-etched.glb",
"model_3d_step": "m251ld2ae-etched.step",
"model_3d_step_plain": "m251ld2ae.step",
"lbr": "m251ld2ae.lbr"
},
"distributor_links": {
"lcsc": "C2917262",
"digikey": "816-M251LD2AE-ND",
"mouser": "503-M251LD2AE"
},
"distributor_check": {
"checked_at": "2026-10-19T05:08:13Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "816-M251LD2AE-ND",
"status": "found",
"lifecycle": "Active"
},
"mouser": {
"pn": "503-M251LD2AE",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "PB.5",
"type": "bidirectional",
"description": "General-purpose digital I/O PB.5; the datasheet lists alternate functions EADC0_CH5, ACMP1_N, I2C0_SCL, USCI1_CTL0, SC0_CLK, PWM0_CH0, UART2_TXD, TM0 and INT0."
},
{
"number": "2",
"name": "PB.4",
"type": "bidirectional",
"description": "General-purpose digital I/O PB.4; the datasheet lists alternate functions EADC0_CH4, ACMP1_P1, I2C0_SDA, USCI1_CTL1, SC0_DAT, PWM0_CH1, UART2_RXD, TM1 and INT1."
},
{
"number": "3",
"name": "PB.3",
"type": "bidirectional",
"description": "General-purpose digital I/O PB.3; the datasheet lists alternate functions EADC0_CH3, ACMP0_N, I2C1_SCL, UART1_TXD, USCI1_DAT1, SC0_RST, PWM0_CH2, PWM0_BRAKE0, TM2 and INT2."
},
{
"number": "4",
"name": "PB.2",
"type": "bidirectional",
"description": "General-purpose digital I/O PB.2; the datasheet lists alternate functions EADC0_CH2, ACMP0_P1, I2C1_SDA, UART1_RXD, USCI1_DAT0, SC0_PWR, PWM0_CH3, TM3 and INT3."
},
{
"number": "5",
"name": "PB.1",
"type": "bidirectional",
"description": "General-purpose digital I/O PB.1; the datasheet lists alternate functions EADC0_CH1, UART2_TXD, USCI1_CLK, I2C1_SCL, QSPI0_MISO1, PWM0_CH4, PWM1_CH4 and PWM0_BRAKE0."
},
{
"number": "6",
"name": "PB.0",
"type": "bidirectional",
"description": "General-purpose digital I/O PB.0; the datasheet lists alternate functions EADC0_CH0, UART2_RXD, SPI0_I2SMCLK, I2C1_SDA, QSPI0_MOSI1, PWM0_CH5, PWM1_CH5 and PWM0_BRAKE1."
},
{
"number": "7",
"name": "PA.11",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.11; the datasheet lists alternate functions ACMP0_P0, USCI0_CLK, BPWM0_CH0 and TM0_EXT."
},
{
"number": "8",
"name": "PA.10",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.10; the datasheet lists alternate functions ACMP1_P0, USCI0_DAT0, BPWM0_CH1 and TM1_EXT."
},
{
"number": "9",
"name": "PA.9",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.9; the datasheet lists alternate functions USCI0_DAT1, UART1_TXD, BPWM0_CH2 and TM2_EXT."
},
{
"number": "10",
"name": "PA.8",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.8; the datasheet lists alternate functions USCI0_CTL1, UART1_RXD, BPWM0_CH3, TM3_EXT and INT4."
},
{
"number": "11",
"name": "PF.5",
"type": "bidirectional",
"description": "General-purpose digital I/O PF.5; the datasheet lists alternate functions UART2_RXD, UART2_nCTS, PWM0_CH0, BPWM0_CH4, X32_IN and EADC0_ST (external trigger input)."
},
{
"number": "12",
"name": "PF.4",
"type": "bidirectional",
"description": "General-purpose digital I/O PF.4; the datasheet lists alternate functions UART2_TXD, UART2_nRTS, PWM0_CH1, BPWM0_CH5 and X32_OUT."
},
{
"number": "13",
"name": "PF.3",
"type": "bidirectional",
"description": "General-purpose digital I/O PF.3; the datasheet lists alternate functions UART0_TXD, I2C0_SCL, XT1_IN and BPWM1_CH0."
},
{
"number": "14",
"name": "PF.2",
"type": "bidirectional",
"description": "General-purpose digital I/O PF.2; the datasheet lists alternate functions UART0_RXD, I2C0_SDA, QSPI0_CLK, XT1_OUT and BPWM1_CH1."
},
{
"number": "15",
"name": "PA.7",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.7; the datasheet lists alternate functions UART0_TXD, I2C1_SCL, PWM1_CH4, BPWM1_CH2, ACMP0_WLAT, TM2 and INT1."
},
{
"number": "16",
"name": "PA.6",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.6; the datasheet lists alternate functions UART0_RXD, I2C1_SDA, PWM1_CH5, BPWM1_CH3, ACMP1_WLAT, TM3 and INT0."
},
{
"number": "17",
"name": "PA.5",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.5; the datasheet lists alternate functions QSPI0_MISO1, UART0_nCTS, UART0_TXD, I2C0_SCL, BPWM0_CH5 and PWM0_CH0."
},
{
"number": "18",
"name": "PA.4",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.4; the datasheet lists alternate functions QSPI0_MOSI1, SPI0_I2SMCLK, SC0_nCD, UART0_nRTS, UART0_RXD, I2C0_SDA, BPWM0_CH4 and PWM0_CH1."
},
{
"number": "19",
"name": "PA.3",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.3; the datasheet lists alternate functions QSPI0_SS, SPI0_SS, SC0_PWR, I2C0_SMBAL, UART1_TXD, I2C1_SCL, BPWM0_CH3, PWM0_CH2, CLKO and PWM1_BRAKE1."
},
{
"number": "20",
"name": "PA.2",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.2; the datasheet lists alternate functions QSPI0_CLK, SPI0_CLK, SC0_RST, I2C0_SMBSUS, UART1_RXD, I2C1_SDA, BPWM0_CH2 and PWM0_CH3."
},
{
"number": "21",
"name": "PA.1",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.1; the datasheet lists alternate functions QSPI0_MISO0, SPI0_MISO, SC0_DAT, UART0_TXD, UART1_nCTS, BPWM0_CH1 and PWM0_CH4."
},
{
"number": "22",
"name": "PA.0",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.0; the datasheet lists alternate functions QSPI0_MOSI0, SPI0_MOSI, SC0_CLK, UART0_RXD, UART1_nRTS, BPWM0_CH0 and PWM0_CH5."
},
{
"number": "23",
"name": "VDDIO",
"type": "power_in",
"description": "Power supply for PA.0~PA.5 (the datasheet gives no voltage limits in this section)."
},
{
"number": "24",
"name": "nRESET",
"type": "input",
"description": "External reset input, active LOW, with an internal pull-up; driving it low resets the chip to its initial state, and the datasheet recommends a 10 kΩ pull-up resistor and 10 uF capacitor on this pin."
},
{
"number": "25",
"name": "PF.0",
"type": "bidirectional",
"description": "General-purpose digital I/O PF.0 also used as ICE_DAT (serial wired debugger data); the datasheet recommends a 100 kΩ pull-up resistor on ICE_DAT, and other alternate functions are UART1_TXD, I2C1_SCL, UART0_TXD and BPWM1_CH0."
},
{
"number": "26",
"name": "PF.1",
"type": "bidirectional",
"description": "General-purpose digital I/O PF.1 also used as ICE_CLK (serial wired debugger clock); the datasheet recommends a 100 kΩ pull-up resistor on ICE_CLK, and other alternate functions are UART1_RXD, I2C1_SDA, UART0_RXD and BPWM1_CH1."
},
{
"number": "27",
"name": "PC.5",
"type": "bidirectional",
"description": "General-purpose digital I/O PC.5; the datasheet lists alternate functions QSPI0_MISO1, UART2_TXD, I2C1_SCL, PWM1_CH0 and PSIO0_CH0."
},
{
"number": "28",
"name": "PC.4",
"type": "bidirectional",
"description": "General-purpose digital I/O PC.4; the datasheet lists alternate functions QSPI0_MOSI1, UART2_RXD, I2C1_SDA, PWM1_CH1 and PSIO0_CH1."
},
{
"number": "29",
"name": "PC.3",
"type": "bidirectional",
"description": "General-purpose digital I/O PC.3; the datasheet lists alternate functions QSPI0_SS, UART2_nRTS, I2C0_SMBAL, PWM1_CH2 and PSIO0_CH2."
},
{
"number": "30",
"name": "PC.2",
"type": "bidirectional",
"description": "General-purpose digital I/O PC.2; the datasheet lists alternate functions QSPI0_CLK, UART2_nCTS, I2C0_SMBSUS, PWM1_CH3 and PSIO0_CH3."
},
{
"number": "31",
"name": "PC.1",
"type": "bidirectional",
"description": "General-purpose digital I/O PC.1; the datasheet lists alternate functions QSPI0_MISO0, UART2_TXD, I2C0_SCL, PWM1_CH4 and ACMP0_O."
},
{
"number": "32",
"name": "PC.0",
"type": "bidirectional",
"description": "General-purpose digital I/O PC.0; the datasheet lists alternate functions QSPI0_MOSI0, UART2_RXD, I2C0_SDA, PWM1_CH5 and ACMP1_O."
},
{
"number": "33",
"name": "PA.12",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.12; the datasheet lists alternate functions I2C1_SCL and BPWM1_CH2."
},
{
"number": "34",
"name": "PA.13",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.13; the datasheet lists alternate functions I2C1_SDA and BPWM1_CH3."
},
{
"number": "35",
"name": "PA.14",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.14; the datasheet lists alternate functions UART0_TXD and BPWM1_CH4."
},
{
"number": "36",
"name": "PA.15",
"type": "bidirectional",
"description": "General-purpose digital I/O PA.15; the datasheet lists alternate functions UART0_RXD and BPWM1_CH5."
},
{
"number": "37",
"name": "VSS",
"type": "power_in",
"description": "Ground pin for digital circuit."
},
{
"number": "38",
"name": "LDO_CAP",
"type": "power_out",
"description": "LDO output pin; the datasheet requires a 1 uF capacitor connected to this pin."
},
{
"number": "39",
"name": "VDD",
"type": "power_in",
"description": "Power supply for I/O ports and LDO source for internal PLL and digital circuit."
},
{
"number": "40",
"name": "PC.14",
"type": "bidirectional",
"description": "General-purpose digital I/O PC.14; the datasheet lists alternate functions SPI0_I2SMCLK, USCI0_CTL0, QSPI0_CLK and TM1."
},
{
"number": "41",
"name": "PB.15",
"type": "bidirectional",
"description": "General-purpose digital I/O PB.15; the datasheet lists alternate functions EADC0_CH15, SPI0_SS, USCI0_CTL1, UART0_nCTS, PSIO0_CH0, PWM1_CH0, TM0_EXT and PWM0_BRAKE1."
},
{
"number": "42",
"name": "PB.14",
"type": "bidirectional",
"description": "General-purpose digital I/O PB.14; the datasheet lists alternate functions EADC0_CH14, SPI0_CLK, USCI0_DAT1, UART0_nRTS, PSIO0_CH1, PWM1_CH1, TM1_EXT and CLKO."
},
{
"number": "43",
"name": "PB.13",
"type": "bidirectional",
"description": "General-purpose digital I/O PB.13; the datasheet lists alternate functions EADC0_CH13, ACMP0_P3, ACMP1_P3, SPI0_MISO, USCI0_DAT0, UART0_TXD, PSIO0_CH2, PWM1_CH2 and TM2_EXT."
},
{
"number": "44",
"name": "PB.12",
"type": "bidirectional",
"description": "General-purpose digital I/O PB.12; the datasheet lists alternate functions EADC0_CH12, ACMP0_P2, ACMP1_P2, SPI0_MOSI, USCI0_CLK, UART0_RXD, PSIO0_CH3, PWM1_CH3 and TM3_EXT."
},
{
"number": "45",
"name": "AVDD",
"type": "power_in",
"description": "Power supply for internal analog circuit."
},
{
"number": "46",
"name": "AVSS",
"type": "power_in",
"description": "Ground pin for analog circuit."
},
{
"number": "47",
"name": "PB.7",
"type": "bidirectional",
"description": "General-purpose digital I/O PB.7; the datasheet lists alternate functions EADC0_CH7, USCI1_DAT0, UART1_TXD, BPWM1_CH4, PWM1_BRAKE0, PWM1_CH4, INT5 and ACMP0_O."
},
{
"number": "48",
"name": "PB.6",
"type": "bidirectional",
"description": "General-purpose digital I/O PB.6; the datasheet lists alternate functions EADC0_CH6, USCI1_DAT1, UART1_RXD, BPWM1_CH5, PWM1_BRAKE1, PWM1_CH5, INT4 and ACMP1_O."
}
],
"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: Package mapping: the MPN M251LD2AE uses the 'L' code, which the naming rule (page 38) defines as LQF; Multi-function pins: the datasheet lists alternate functions for each pin but does not state which f; Inferred pin types: LDO_CAP is typed power_out because the datasheet calls it an LDO output; VDDIO i"
],
"pages_sent": 84,
"cost_usd": 0.8663,
"at": "2026-10-19T05:07:52"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590207682197159936",
"pages": 263,
"sha256": "c4af3258cc70fcc5",
"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"
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"sha256": "9dea352d93177c2904afd7d7b68ea8855ce1ab691f69f8b3e13655600514b6bf",
"checked": "2026-10-19",
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{
"file": "m251ld2ae-etched.step",
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"sha256": "383349a0ea9ab8d442b07a7a82f7efa3c62fbbab3c5d05470bbfdf8f4dc26d45",
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}
]
},
"metadata": {
"specs": {
"Manufacturer": "Nuvoton Tech",
"Package": "LQFP-48(7x7)",
"Category": "Embedded Processors & Controllers",
"Pins": "48"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "c4af3258cc70fcc57f4481d5d3a6aa8bc1e7105450155b9adda18cf40a5e775e",
"rows": [
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"name": "DC power supply",
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{
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{
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{
"name": "Variations between different ground pins",
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