component
STM32L431CBU6
Public Made by Adomby adom
STMicroelectronics Microcontrollers (MCU/MPU/SOC), UFQFPN-48(7x7). Pinout checked against ST's open pin data, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "stm32l431cbu6",
"title": "STM32L431CBU6",
"brief": "STMicroelectronics Microcontrollers (MCU/MPU/SOC), UFQFPN-48(7x7). Pinout checked against ST's open pin data, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
"component",
"embedded processors & controllers",
"stm32l431cbu6",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "STM32L431CBU6",
"manufacturer": "STMicroelectronics",
"package": "UFQFPN-48(7x7)",
"pin_count": 49,
"category": "Embedded Processors & Controllers",
"subcategory": "Microcontrollers (MCU/MPU/SOC)",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588917371532677120",
"parts": {
"symbol": "stm32l431cbu6.kicad_sym",
"footprint": "stm32l431cbu6.kicad_mod",
"model_3d": "stm32l431cbu6-hero.glb",
"model_3d_plain": "stm32l431cbu6.glb",
"model_3d_step": "stm32l431cbu6-etched.step",
"model_3d_step_plain": "stm32l431cbu6.step",
"lbr": "stm32l431cbu6.lbr"
},
"distributor_links": {
"lcsc": 915967,
"digikey": "497-17849-ND",
"mouser": "511-STM32L431CBU6"
},
"distributor_check": {
"checked_at": "2026-10-03T01:35:49Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "497-17849-ND",
"status": "found"
},
"mouser": {
"pn": "511-STM32L431CBU6",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "VBAT",
"type": "power_in",
"description": "Backup domain supply for RTC, LSE and backup registers, operating range 1.55 V to 3.6 V."
},
{
"number": "2",
"name": "PC13",
"type": "bidirectional",
"description": "FT I/O supplied via the VBAT power switch, output limited to 2 MHz with 30 pF max load and no current-source use (3 mA switch limit); additional functions RTC_TAMP1, RTC_TS, RTC_OUT, WKUP2."
},
{
"number": "3",
"name": "PC14-OSC32_IN",
"type": "bidirectional",
"description": "FT I/O (PC14) supplied via the power switch with the same 2 MHz/30 pF output limit; serves as LSE 32.768 kHz oscillator input OSC32_IN."
},
{
"number": "4",
"name": "PC15-OSC32_OUT",
"type": "bidirectional",
"description": "FT I/O (PC15) supplied via the power switch with the same 2 MHz/30 pF output limit; serves as LSE 32.768 kHz oscillator output OSC32_OUT."
},
{
"number": "5",
"name": "PH0-OSC_IN",
"type": "bidirectional",
"description": "FT I/O (PH0) that serves as the 4 to 48 MHz HSE crystal oscillator input OSC_IN."
},
{
"number": "6",
"name": "PH1-OSC_OUT",
"type": "bidirectional",
"description": "FT I/O (PH1) that serves as the HSE crystal oscillator output OSC_OUT."
},
{
"number": "7",
"name": "NRST",
"type": "bidirectional",
"description": "Bidirectional reset pin with embedded weak pull-up resistor."
},
{
"number": "8",
"name": "VSSA/VREF-",
"type": "power_in",
"description": "Analog ground, also the negative reference voltage for the ADC (VREF- = VSSA)."
},
{
"number": "9",
"name": "VDDA/VREF+",
"type": "power_in",
"description": "Analog supply, 1.62 V min with ADC or COMP, 1.8 V with DAC or OPAMP, 2.4 V with VREFBUF, up to 3.6 V; also the positive reference voltage."
},
{
"number": "10",
"name": "PA0",
"type": "bidirectional",
"description": "FT_a I/O with TIM2_CH1, USART2_CTS, COMP1_OUT; analog functions OPAMP1_VINP, COMP1_INM, ADC1_IN5, RTC_TAMP2, WKUP1."
},
{
"number": "11",
"name": "PA1",
"type": "bidirectional",
"description": "FT_a I/O with TIM2_CH2, I2C1_SMBA, SPI1_SCK, USART2_RTS_DE; analog functions OPAMP1_VINM, COMP1_INP, ADC1_IN6."
},
{
"number": "12",
"name": "PA2",
"type": "bidirectional",
"description": "FT_a I/O with TIM2_CH3, USART2_TX, LPUART1_TX, QUADSPI_BK1_NCS; analog functions COMP2_INM, ADC1_IN7, WKUP4, LSCO."
},
{
"number": "13",
"name": "PA3",
"type": "bidirectional",
"description": "TT_a (3.6 V tolerant) I/O with TIM2_CH4, USART2_RX, LPUART1_RX, QUADSPI_CLK; analog functions OPAMP1_VOUT, COMP2_INP, ADC1_IN8."
},
{
"number": "14",
"name": "PA4",
"type": "bidirectional",
"description": "TT_a (3.6 V tolerant) I/O with SPI1_NSS, SPI3_NSS, USART2_CK; analog functions COMP1_INM, COMP2_INM, ADC1_IN9, DAC1_OUT1."
},
{
"number": "15",
"name": "PA5",
"type": "bidirectional",
"description": "TT_a (3.6 V tolerant) I/O with TIM2_CH1, TIM2_ETR, SPI1_SCK; analog functions COMP1_INM, COMP2_INM, ADC1_IN10, DAC1_OUT2."
},
{
"number": "16",
"name": "PA6",
"type": "bidirectional",
"description": "FT_a I/O with TIM1_BKIN, SPI1_MISO, COMP1_OUT, USART3_CTS, QUADSPI_BK1_IO3; analog function ADC1_IN11."
},
{
"number": "17",
"name": "PA7",
"type": "bidirectional",
"description": "FT_fa I/O (Fm+ capable) with TIM1_CH1N, I2C3_SCL, SPI1_MOSI, QUADSPI_BK1_IO2; analog function ADC1_IN12."
},
{
"number": "18",
"name": "PB0",
"type": "bidirectional",
"description": "FT_a I/O with TIM1_CH2N, SPI1_NSS, USART3_CK, QUADSPI_BK1_IO1; analog function ADC1_IN15."
},
{
"number": "19",
"name": "PB1",
"type": "bidirectional",
"description": "FT_a I/O with TIM1_CH3N, USART3_RTS_DE, LPUART1_RTS_DE, QUADSPI_BK1_IO0; analog functions COMP1_INM, ADC1_IN16."
},
{
"number": "20",
"name": "PB2",
"type": "bidirectional",
"description": "FT_a I/O with RTC_OUT, LPTIM1_OUT, I2C3_SMBA; analog function COMP1_INP."
},
{
"number": "21",
"name": "PB10",
"type": "bidirectional",
"description": "FT_f I/O (Fm+ capable) with TIM2_CH3, I2C2_SCL, SPI2_SCK, USART3_TX, LPUART1_RX, QUADSPI_CLK."
},
{
"number": "22",
"name": "PB11",
"type": "bidirectional",
"description": "FT_f I/O (Fm+ capable) with TIM2_CH4, I2C2_SDA, USART3_RX, LPUART1_TX, QUADSPI_BK1_NCS."
},
{
"number": "23",
"name": "VSS",
"type": "power_in",
"description": "Digital ground; all VSS pins must be connected to the external ground."
},
{
"number": "24",
"name": "VDD",
"type": "power_in",
"description": "Digital supply, 1.71 V to 3.6 V; must be decoupled with ceramic capacitors close to the pin."
},
{
"number": "25",
"name": "PB12",
"type": "bidirectional",
"description": "FT I/O with TIM1_BKIN, I2C2_SMBA, SPI2_NSS, USART3_CK, LPUART1_RTS_DE, TSC_G1_IO1, SWPMI1_IO, SAI1_FS_A."
},
{
"number": "26",
"name": "PB13",
"type": "bidirectional",
"description": "FT_f I/O (Fm+ capable) with TIM1_CH1N, I2C2_SCL, SPI2_SCK, USART3_CTS, LPUART1_CTS, TSC_G1_IO2, SWPMI1_TX, SAI1_SCK_A."
},
{
"number": "27",
"name": "PB14",
"type": "bidirectional",
"description": "FT_f I/O (Fm+ capable) with TIM1_CH2N, I2C2_SDA, SPI2_MISO, USART3_RTS_DE, TSC_G1_IO3, SWPMI1_RX, SAI1_MCLK_A."
},
{
"number": "28",
"name": "PB15",
"type": "bidirectional",
"description": "FT I/O with RTC_REFIN, TIM1_CH3N, SPI2_MOSI, TSC_G1_IO4, SWPMI1_SUSPEND, SAI1_SD_A."
},
{
"number": "29",
"name": "PA8",
"type": "bidirectional",
"description": "FT I/O with MCO, TIM1_CH1, USART1_CK, SWPMI1_IO, SAI1_SCK_A, LPTIM2_OUT."
},
{
"number": "30",
"name": "PA9",
"type": "bidirectional",
"description": "FT_f I/O (Fm+ capable) with TIM1_CH2, I2C1_SCL, USART1_TX, SAI1_FS_A, TIM15_BKIN."
},
{
"number": "31",
"name": "PA10",
"type": "bidirectional",
"description": "FT_f I/O (Fm+ capable) with TIM1_CH3, I2C1_SDA, USART1_RX, SAI1_SD_A."
},
{
"number": "32",
"name": "PA11",
"type": "bidirectional",
"description": "FT I/O with TIM1_CH4, TIM1_BKIN2, SPI1_MISO, COMP1_OUT, USART1_CTS, CAN1_RX."
},
{
"number": "33",
"name": "PA12",
"type": "bidirectional",
"description": "FT I/O with TIM1_ETR, SPI1_MOSI, USART1_RTS_DE, CAN1_TX."
},
{
"number": "34",
"name": "PA13 (JTMS-SWDIO)",
"type": "bidirectional",
"description": "FT I/O that is JTMS-SWDIO after reset with internal pull-up active; also IR_OUT, SWPMI1_TX, SAI1_SD_B."
},
{
"number": "35",
"name": "VSS",
"type": "power_in",
"description": "Digital ground; all VSS pins must be connected to the external ground."
},
{
"number": "36",
"name": "VDD",
"type": "power_in",
"description": "Digital supply, 1.71 V to 3.6 V; must be decoupled with ceramic capacitors close to the pin."
},
{
"number": "37",
"name": "PA14 (JTCK-SWCLK)",
"type": "bidirectional",
"description": "FT I/O that is JTCK-SWCLK after reset with internal pull-down active; also LPTIM1_OUT, I2C1_SMBA, SWPMI1_RX, SAI1_FS_B."
},
{
"number": "38",
"name": "PA15 (JTDI)",
"type": "bidirectional",
"description": "FT I/O that is JTDI after reset with internal pull-up active; also TIM2_CH1, USART2_RX, SPI1_NSS, SPI3_NSS, TSC_G3_IO1."
},
{
"number": "39",
"name": "PB3 (JTDO-TRACESWO)",
"type": "bidirectional",
"description": "FT_a I/O that is JTDO-TRACESWO after reset; also TIM2_CH2, SPI1_SCK, SPI3_SCK, USART1_RTS_DE, SAI1_SCK_B, analog COMP2_INM."
},
{
"number": "40",
"name": "PB4 (NJTRST)",
"type": "bidirectional",
"description": "FT_fa I/O (Fm+ capable) that is NJTRST after reset with internal pull-up active; also I2C3_SDA, SPI1_MISO, SPI3_MISO, USART1_CTS, analog COMP2_INP."
},
{
"number": "41",
"name": "PB5",
"type": "bidirectional",
"description": "FT I/O with LPTIM1_IN1, I2C1_SMBA, SPI1_MOSI, SPI3_MOSI, USART1_CK, TSC_G2_IO2, COMP2_OUT, SAI1_SD_B, TIM16_BKIN."
},
{
"number": "42",
"name": "PB6",
"type": "bidirectional",
"description": "FT_fa I/O (Fm+ capable) with LPTIM1_ETR, I2C1_SCL, USART1_TX, TSC_G2_IO3, SAI1_FS_B, TIM16_CH1N; analog COMP2_INP."
},
{
"number": "43",
"name": "PB7",
"type": "bidirectional",
"description": "FT_fa I/O (Fm+ capable) with LPTIM1_IN2, I2C1_SDA, USART1_RX, TSC_G2_IO4; analog COMP2_INM, PVD_IN."
},
{
"number": "44",
"name": "PH3/BOOT0",
"type": "input",
"description": "FT pin used as the BOOT0 boot mode selection input (PH3 GPIO with EVENTOUT alternate function)."
},
{
"number": "45",
"name": "PB8",
"type": "bidirectional",
"description": "FT_f I/O (Fm+ capable) with I2C1_SCL, CAN1_RX, SDMMC1_D4, SAI1_MCLK_A, TIM16_CH1."
},
{
"number": "46",
"name": "PB9",
"type": "bidirectional",
"description": "FT_f I/O (Fm+ capable) with IR_OUT, I2C1_SDA, SPI2_NSS, CAN1_TX, SDMMC1_D5, SAI1_FS_A."
},
{
"number": "47",
"name": "VSS",
"type": "power_in",
"description": "Digital ground; all VSS pins must be connected to the external ground."
},
{
"number": "48",
"name": "VDD",
"type": "power_in",
"description": "Digital supply, 1.71 V to 3.6 V; must be decoupled with ceramic capacitors close to the pin."
},
{
"number": "49",
"name": "EP",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-haiku-4-5-20251001",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"exposed pad 49 added from the footprint"
],
"pages_sent": 80,
"cost_usd": 0.5694,
"at": "2026-10-03T01:35:23"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588917371532677120",
"pages": 208,
"sha256": "9407aade68696ec5",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 49,
"described": 49,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
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"footprint": "viewers/footprint.html"
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},
"metadata": {
"specs": {
"Manufacturer": "STMicroelectronics",
"Package": "UFQFPN-48(7x7)",
"Category": "Embedded Processors & Controllers",
"Pins": "49"
}
},
"variants": [],
"sections": [
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"discovery_triggers": [
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"discovery_pitch": "STM32L431CBU6 (STMicroelectronics) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
"author": {
"name": "Ray",
"email": "[email protected]"
},
"dependencies": {},
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