component
STM32L431KCU6
Public Made by Adomby adom
STMicroelectronics Microcontrollers (MCU/MPU/SOC), UFQFPN-32(5x5). Pinout checked against ST's open pin data, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "stm32l431kcu6",
"title": "STM32L431KCU6",
"brief": "STMicroelectronics Microcontrollers (MCU/MPU/SOC), UFQFPN-32(5x5). 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",
"stm32l431kcu6",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "STM32L431KCU6",
"manufacturer": "STMicroelectronics",
"package": "UFQFPN-32(5x5)",
"pin_count": 33,
"category": "Embedded Processors & Controllers",
"subcategory": "Microcontrollers (MCU/MPU/SOC)",
"datasheet": "https://www.st.com/resource/en/datasheet/stm32l431kcu6.pdf",
"parts": {
"symbol": "stm32l431kcu6.kicad_sym",
"footprint": "stm32l431kcu6.kicad_mod",
"model_3d": "stm32l431kcu6-hero.glb",
"model_3d_plain": "stm32l431kcu6-etched.glb",
"model_3d_step": "stm32l431kcu6-etched.step",
"model_3d_step_plain": "stm32l431kcu6.step",
"lbr": "stm32l431kcu6.lbr"
},
"distributor_links": {
"lcsc": "C1341298",
"digikey": "497-17958-ND",
"mouser": "511-STM32L431KCU6"
},
"distributor_check": {
"checked_at": "2026-11-05T23:43:34Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "497-17958-ND",
"status": "found"
},
"mouser": {
"pn": "511-STM32L431KCU6",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "VDD",
"type": "power_in",
"description": "Standard operating voltage of 1.71 V to 3.6 V (Table 22)."
},
{
"number": "2",
"name": "PC14-OSC32_IN",
"type": "bidirectional",
"description": "FT I/O supplied through the power switch, which sinks only 3 mA, so output use is limited to 2 MHz at 30 pF and it must not source current; also serves as the OSC32_IN input."
},
{
"number": "3",
"name": "PC15-OSC32_OUT",
"type": "bidirectional",
"description": "FT I/O supplied through the power switch, which sinks only 3 mA, so output use is limited to 2 MHz at 30 pF and it must not source current; also serves as the OSC32_OUT output."
},
{
"number": "4",
"name": "NRST",
"type": "bidirectional",
"description": "Bidirectional reset pin with an embedded weak pull-up resistor."
},
{
"number": "5",
"name": "VDDA/VREF+",
"type": "power_in",
"description": "Analog supply of 1.62 V to 3.6 V when the ADC or COMP is used (Table 22); also functions as the VREF+ reference input."
},
{
"number": "6",
"name": "PA0/CK_IN",
"type": "bidirectional",
"description": "5 V tolerant analog-switch I/O (FT_a) with TIM2_CH1, USART2_CTS, COMP1_OUT, SAI1_EXTCLK and TIM2_ETR alternate functions, plus ADC1_IN5 and CK_IN."
},
{
"number": "7",
"name": "PA1",
"type": "bidirectional",
"description": "5 V tolerant analog-switch I/O (FT_a) with TIM2_CH2, I2C1_SMBA, SPI1_SCK, USART2_RTS_DE and TIM15_CH1N alternate functions, plus ADC1_IN6."
},
{
"number": "8",
"name": "PA2",
"type": "bidirectional",
"description": "5 V tolerant analog-switch I/O (FT_a) with TIM2_CH3, USART2_TX, LPUART1_TX, QUADSPI_BK1_NCS and TIM15_CH1 alternate functions, plus ADC1_IN7 and WKUP4."
},
{
"number": "9",
"name": "PA3",
"type": "bidirectional",
"description": "3.6 V tolerant analog-switch I/O (TT_a) with TIM2_CH4, USART2_RX, LPUART1_RX, QUADSPI_CLK and SAI1_MCLK_A alternate functions, plus ADC1_IN8."
},
{
"number": "10",
"name": "PA4",
"type": "bidirectional",
"description": "3.6 V tolerant analog-switch I/O (TT_a) with SPI1_NSS, SPI3_NSS, USART2_CK, SAI1_FS_B and LPTIM2_OUT alternate functions, plus ADC1_IN9 and DAC1_OUT1."
},
{
"number": "11",
"name": "PA5",
"type": "bidirectional",
"description": "3.6 V tolerant analog-switch I/O (TT_a) with TIM2_CH1, TIM2_ETR, SPI1_SCK and LPTIM2_ETR alternate functions, plus ADC1_IN10 and DAC1_OUT2."
},
{
"number": "12",
"name": "PA6",
"type": "bidirectional",
"description": "5 V tolerant analog-switch I/O (FT_a) with TIM1_BKIN, SPI1_MISO, COMP1_OUT, USART3_CTS, LPUART1_CTS, QUADSPI_BK1_IO3 and TIM16_CH1 alternate functions, plus ADC1_IN11."
},
{
"number": "13",
"name": "PA7",
"type": "bidirectional",
"description": "5 V tolerant I/O with Fm+ capability (FT_fa) with TIM1_CH1N, I2C3_SCL, SPI1_MOSI, QUADSPI_BK1_IO2 and COMP2_OUT alternate functions, plus ADC1_IN12."
},
{
"number": "14",
"name": "PB0",
"type": "bidirectional",
"description": "5 V tolerant analog-switch I/O (FT_a) with TIM1_CH2N, SPI1_NSS, USART3_CK, QUADSPI_BK1_IO1, COMP1_OUT and SAI1_EXTCLK alternate functions, plus ADC1_IN15."
},
{
"number": "15",
"name": "PB1",
"type": "bidirectional",
"description": "5 V tolerant analog-switch I/O (FT_a) with TIM1_CH3N, USART3_RTS_DE, LPUART1_RTS_DE, QUADSPI_BK1_IO0 and LPTIM2_IN1 alternate functions, plus COMP1_INM and ADC1_IN16."
},
{
"number": "16",
"name": "VSS",
"type": "power_in",
"description": "Ground pin."
},
{
"number": "17",
"name": "VDD",
"type": "power_in",
"description": "Standard operating voltage of 1.71 V to 3.6 V (Table 22)."
},
{
"number": "18",
"name": "PA8",
"type": "bidirectional",
"description": "5 V tolerant I/O (FT) with MCO, TIM1_CH1, USART1_CK, SWPMI1_IO, SAI1_SCK_A and LPTIM2_OUT alternate functions."
},
{
"number": "19",
"name": "PA9",
"type": "bidirectional",
"description": "5 V tolerant I/O with Fm+ capability (FT_f) with TIM1_CH2, I2C1_SCL, USART1_TX, SAI1_FS_A and TIM15_BKIN alternate functions."
},
{
"number": "20",
"name": "PA10",
"type": "bidirectional",
"description": "5 V tolerant I/O with Fm+ capability (FT_f) with TIM1_CH3, I2C1_SDA, USART1_RX and SAI1_SD_A alternate functions."
},
{
"number": "21",
"name": "PA11",
"type": "bidirectional",
"description": "5 V tolerant I/O (FT) with TIM1_CH4, TIM1_BKIN2, SPI1_MISO, COMP1_OUT, USART1_CTS and CAN1_RX alternate functions."
},
{
"number": "22",
"name": "PA12",
"type": "bidirectional",
"description": "5 V tolerant I/O (FT) with TIM1_ETR, SPI1_MOSI, USART1_RTS_DE and CAN1_TX alternate functions."
},
{
"number": "23",
"name": "PA13 (JTMS-SWDIO)",
"type": "bidirectional",
"description": "5 V tolerant I/O (FT) that after reset is configured as the JTMS-SWDIO debug function with an internal pull-up enabled."
},
{
"number": "24",
"name": "PA14 (JTCK-SWCLK)",
"type": "bidirectional",
"description": "5 V tolerant I/O (FT) that after reset is configured as the JTCK-SWCLK debug function with an internal pull-down enabled."
},
{
"number": "25",
"name": "PA15 (JTDI)",
"type": "bidirectional",
"description": "5 V tolerant I/O (FT) that after reset is configured as the JTDI debug function with an internal pull-up enabled."
},
{
"number": "26",
"name": "PB3 (JTDO-TRACESWO)",
"type": "bidirectional",
"description": "5 V tolerant analog-switch I/O (FT_a) that after reset is configured as the JTDO-TRACESWO debug function, with TIM2_CH2, SPI1_SCK and SAI1_SCK_B alternate functions and COMP2_INM."
},
{
"number": "27",
"name": "PB4 (NJTRST)",
"type": "bidirectional",
"description": "5 V tolerant I/O with Fm+ and analog-switch capability (FT_fa) that after reset is configured as NJTRST with an internal pull-up enabled, with I2C3_SDA, SPI1_MISO and TSC_G2_IO1 alternate functions and COMP2_INP."
},
{
"number": "28",
"name": "PB5",
"type": "bidirectional",
"description": "5 V tolerant I/O (FT) with LPTIM1_IN1, I2C1_SMBA, SPI1_MOSI, USART1_CK, TSC_G2_IO2, COMP2_OUT, SAI1_SD_B and TIM16_BKIN alternate functions."
},
{
"number": "29",
"name": "PB6",
"type": "bidirectional",
"description": "5 V tolerant I/O with Fm+ and analog-switch capability (FT_fa) with LPTIM1_ETR, I2C1_SCL, USART1_TX, TSC_G2_IO3, SAI1_FS_B and TIM16_CH1N alternate functions, plus COMP2_INP."
},
{
"number": "30",
"name": "PB7",
"type": "bidirectional",
"description": "5 V tolerant I/O with Fm+ and analog-switch capability (FT_fa) with LPTIM1_IN2, I2C1_SDA, USART1_RX and TSC_G2_IO4 alternate functions, plus COMP2_INM and PVD_IN."
},
{
"number": "31",
"name": "PH3/BOOT0",
"type": "bidirectional",
"description": "5 V tolerant I/O (FT) that also provides the BOOT0 boot-mode pin."
},
{
"number": "32",
"name": "VSS",
"type": "power_in",
"description": "Ground pin."
},
{
"number": "33",
"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-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"14/33 pins cited to the wrong page (name found elsewhere): ['18:PA8@p62', '19:PA9@p62', '20:PA10@p62', '21:PA11@p62']"
],
"pages_sent": 80,
"cost_usd": 0.0985,
"at": "2026-11-05T23:43:27"
},
"datasheet": {
"url": "https://www.st.com/resource/en/datasheet/stm32l431kcu6.pdf",
"pages": 208,
"sha256": "71963de3cb899f8f",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 33,
"described": 33,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "stm32l431kcu6.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
5,
5,
1.1
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "90af021df1253eae35bee4f4a4f9ba63bcf4a308f6e9f12d58f6e00181c23140",
"checked": "2026-11-05",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "stm32l431kcu6-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
5,
5,
1.1
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "3d3f7884759d0e0ac069c7556e260d19c2a42b6daaa5af7de029e9ca18b79781",
"checked": "2026-11-05",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "STMicroelectronics",
"Package": "UFQFPN-32(5x5)",
"Category": "Embedded Processors & Controllers",
"Pins": "33"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "71963de3cb899f8fc731e05a46c8bcb62c8ce893fe99f3877b0027ae9dfc5c6f",
"rows": [
{
"name": "Standard operating voltage",
"symbol": "VDD",
"kind": "recommended_operating",
"unit": "V",
"min": 1.71,
"typ": null,
"max": 3.6,
"conditions": "-",
"source_page": 88,
"source": "datasheet"
},
{
"name": "Analog supply voltage, ADC or COMP used",
"symbol": "VDDA",
"kind": "recommended_operating",
"unit": "V",
"min": 1.62,
"typ": null,
"max": 3.6,
"conditions": "ADC or COMP used",
"source_page": 88,
"source": "datasheet"
},
{
"name": "Analog supply voltage, DAC or OPAMP used",
"symbol": "VDDA",
"kind": "recommended_operating",
"unit": "V",
"min": 1.8,
"typ": null,
"max": 3.6,
"conditions": "DAC or OPAMP used",
"source_page": 88,
"source": "datasheet"
},
{
"name": "Analog supply voltage, VREFBUF used",
"symbol": "VDDA",
"kind": "recommended_operating",
"unit": "V",
"min": 2.4,
"typ": null,
"max": 3.6,
"conditions": "VREFBUF used",
"source_page": 88,
"source": "datasheet"
},
{
"name": "Backup operating voltage",
"symbol": "VBAT",
"kind": "recommended_operating",
"unit": "V",
"min": 1.55,
"typ": null,
"max": 3.6,
"conditions": "-",
"source_page": 88,
"source": "datasheet"
},
{
"name": "Internal AHB clock frequency",
"symbol": "fHCLK",
"kind": "recommended_operating",
"unit": "MHz",
"min": 0,
"typ": null,
"max": 80,
"conditions": "-",
"source_page": 88,
"source": "datasheet"
},
{
"name": "Internal APB1 clock frequency",
"symbol": "fPCLK1",
"kind": "recommended_operating",
"unit": "MHz",
"min": 0,
"typ": null,
"max": 80,
"conditions": "-",
"source_page": 88,
"source": "datasheet"
},
{
"name": "Internal APB2 clock frequency",
"symbol": "fPCLK2",
"kind": "recommended_operating",
"unit": "MHz",
"min": 0,
"typ": null,
"max": 80,
"conditions": "-",
"source_page": 88,
"source": "datasheet"
},
{
"name": "Ambient temperature for the suffix 6 version",
"symbol": "TA",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": null,
"max": 85,
"conditions": "Maximum power dissipation",
"source_page": 88,
"source": "datasheet"
},
{
"name": "Ambient temperature for the suffix 6 version, low-power dissipation",
"symbol": "TA",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": null,
"max": 105,
"conditions": "Low-power dissipation",
"source_page": 88,
"source": "datasheet"
},
{
"name": "Junction temperature range, suffix 6 version",
"symbol": "TJ",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": null,
"max": 105,
"conditions": "Suffix 6 version",
"source_page": 88,
"source": "datasheet"
},
{
"name": "Power dissipation UFQFPN32",
"symbol": "PD",
"kind": "recommended_operating",
"unit": "mW",
"min": null,
"typ": null,
"max": 523,
"conditions": "TA = 85 °C for suffix 6",
"source_page": 88,
"source": "datasheet"
},
{
"name": "I/O input voltage, all I/O except TT_xx",
"symbol": "VIN",
"kind": "recommended_operating",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "Max = Min(Min(VDD, VDDA)+3.6 V, 5.5 V)",
"source_page": 88,
"source": "datasheet"
},
{
"name": "I/O input voltage, TT_xx I/O",
"symbol": "VIN",
"kind": "recommended_operating",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "Max = VDDIOx+0.3",
"source_page": 88,
"source": "datasheet"
},
{
"name": "External main supply voltage (including VDD, VDDA, VBAT)",
"symbol": "VDDX - VSS",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 4,
"conditions": "-",
"source_page": 86,
"source": "datasheet"
},
{
"name": "Input voltage on any other pins",
"symbol": "VIN",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 4,
"conditions": "-",
"source_page": 86,
"source": "datasheet"
},
{
"name": "Variations between different VDDX power pins of the same domain",
"symbol": "|ΔVDDx|",
"kind": "absolute_maximum",
"unit": "mV",
"min": null,
"typ": null,
"max": 50,
"conditions": "-",
"source_page": 86,
"source": "datasheet"
},
{
"name": "Total current into sum of all VDD power lines (source)",
"symbol": "∑IVDD",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 140,
"conditions": "-",
"source_page": 87,
"source": "datasheet"
},
{
"name": "Total current out of sum of all VSS ground lines (sink)",
"symbol": "∑IVSS",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 140,
"conditions": "-",
"source_page": 87,
"source": "datasheet"
},
{
"name": "Maximum current into each VDD power pin (source)",
"symbol": "IVDD(PIN)",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 100,
"conditions": "-",
"source_page": 87,
"source": "datasheet"
},
{
"name": "Maximum current out of each VSS ground pin (sink)",
"symbol": "IVSS(PIN)",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 100,
"conditions": "-",
"source_page": 87,
"source": "datasheet"
},
{
"name": "Output current sunk by any I/O and control pin except FT_f",
"symbol": "IIO(PIN)",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 20,
"conditions": "-",
"source_page": 87,
"source": "datasheet"
},
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