STM32F334K8U6

{
  "slug": "stm32f334k8u6",
  "version": "0.1.0",
  "type": "component",
  "description": "STMicroelectronics Microcontrollers (MCU/MPU/SOC), UFQFPN-32(5x5). Pinout checked against ST's open pin data, KiCad symbol/footprint/3D.",
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    "embedded processors & controllers",
    "stm32f334k8u6",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "STM32F334K8U6",
    "manufacturer": "STMicroelectronics",
    "package": "UFQFPN-32(5x5)",
    "pin_count": 33,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588922755752738816",
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      "lbr": "stm32f334k8u6.lbr"
    },
    "distributor_links": {
      "lcsc": "C1341602",
      "digikey": "497-STM32F334K8U6-ND",
      "mouser": "511-STM32F334K8U6"
    },
    "distributor_check": {
      "checked_at": "2026-10-11T16:06:50Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "497-STM32F334K8U6-ND",
        "status": "found"
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      "mouser": {
        "pn": "511-STM32F334K8U6",
        "status": "found"
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    "pins": [
      {
        "number": "1",
        "name": "VDD",
        "type": "power_in",
        "description": "Digital power supply; the device voltage range for VDD and VDDA is stated as 2.0 to 3.6 V."
      },
      {
        "number": "2",
        "name": "PF0 / OSC_IN",
        "type": "bidirectional",
        "description": "Five-volt tolerant (FT) I/O that is used as the OSC_IN input of the external 4 to 32 MHz crystal oscillator, with alternate function TIM1_CH3N."
      },
      {
        "number": "3",
        "name": "PF1 / OSC_OUT",
        "type": "bidirectional",
        "description": "Five-volt tolerant (FT) I/O that is used as the OSC_OUT output of the external 4 to 32 MHz crystal oscillator."
      },
      {
        "number": "4",
        "name": "NRST",
        "type": "bidirectional",
        "description": "Bi-directional active-low device reset input / internal reset output with an embedded weak pull-up resistor."
      },
      {
        "number": "5",
        "name": "VDDA/VREF+",
        "type": "power_in",
        "description": "Analog power supply and positive reference voltage for the analog peripherals, with analog supply ranges stated as 2.0 to 3.6 V for the ADC and 2.4 to 3.6 V for the DAC and OPAMP."
      },
      {
        "number": "6",
        "name": "VSSA/VREF-",
        "type": "power_in",
        "description": "Analog ground and negative reference voltage for the analog peripherals."
      },
      {
        "number": "7",
        "name": "PA0",
        "type": "bidirectional",
        "description": "3.3 V tolerant TTa I/O directly connected to the ADC, with fast ADC channel ADC1_IN1 and alternate functions including TIM2_CH1/TIM2_ETR, TSC_G1_IO1 and USART2_CTS."
      },
      {
        "number": "8",
        "name": "PA1",
        "type": "bidirectional",
        "description": "3.3 V tolerant TTa I/O directly connected to the ADC, with fast ADC channel ADC1_IN2 and alternate functions including TIM2_CH2, TSC_G1_IO2, USART2_RTS_DE and TIM15_CH1N."
      },
      {
        "number": "9",
        "name": "PA2",
        "type": "bidirectional",
        "description": "3.3 V tolerant TTa I/O directly connected to the ADC, with fast ADC channel ADC1_IN3, COMP2_INM input and alternate functions including TIM2_CH3, TSC_G1_IO3, USART2_TX and COMP2_OUT."
      },
      {
        "number": "10",
        "name": "PA3",
        "type": "bidirectional",
        "description": "3.3 V tolerant TTa I/O directly connected to the ADC, with fast ADC channel ADC1_IN4 and alternate functions including TIM2_CH4, TSC_G1_IO4, USART2_RX and TIM15_CH2."
      },
      {
        "number": "11",
        "name": "PA4",
        "type": "bidirectional",
        "description": "3.3 V tolerant TTa I/O directly connected to the ADC with reduced touch sensing sensitivity (recommended for use as a sampling capacitor I/O), also providing ADC2_IN1, DAC1_OUT1, and alternate functions including TIM3_CH2, TSC_G2_IO1, SPI1_NSS and USART2_CK."
      },
      {
        "number": "12",
        "name": "PA5",
        "type": "bidirectional",
        "description": "3.3 V tolerant TTa I/O directly connected to the ADC with reduced touch sensing sensitivity (recommended for use as a sampling capacitor I/O), also providing ADC2_IN2, DAC1_OUT2, OPAMP2_VINM and alternate functions including TIM2_CH1/TIM2_ETR, TSC_G2_IO2 and SPI1_SCK."
      },
      {
        "number": "13",
        "name": "PA6",
        "type": "bidirectional",
        "description": "3.3 V tolerant TTa I/O directly connected to the ADC with reduced touch sensing sensitivity (recommended for use as a sampling capacitor I/O), also providing ADC2_IN3, DAC2_OUT1, OPAMP2_VOUT and alternate functions including TIM16_CH1, TIM3_CH1, SPI1_MISO and TIM1_BKIN."
      },
      {
        "number": "14",
        "name": "PA7",
        "type": "bidirectional",
        "description": "3.3 V tolerant TTa I/O directly connected to the ADC, with ADC2_IN4, COMP2_INP and OPAMP2_VINP functions and alternate functions including TIM17_CH1, TIM3_CH2, TSC_G2_IO4, SPI1_MOSI and TIM1_CH1N."
      },
      {
        "number": "15",
        "name": "PB0",
        "type": "bidirectional",
        "description": "3.3 V tolerant TTa I/O directly connected to the ADC, with ADC1_IN11, COMP4_INP and OPAMP2_VINP functions and alternate functions including TIM3_CH3, TSC_G3_IO2 and TIM1_CH2N."
      },
      {
        "number": "16",
        "name": "VSS",
        "type": "power_in",
        "description": "Digital ground."
      },
      {
        "number": "17",
        "name": "VDD",
        "type": "power_in",
        "description": "Digital power supply; the device voltage range for VDD and VDDA is stated as 2.0 to 3.6 V."
      },
      {
        "number": "18",
        "name": "PA8",
        "type": "bidirectional",
        "description": "Five-volt tolerant (FT) I/O with alternate functions including MCO, TIM1_CH1, USART1_CK, HRTIM1_CHA1 and EVENTOUT."
      },
      {
        "number": "19",
        "name": "PA9",
        "type": "bidirectional",
        "description": "Five-volt tolerant (FT) I/O with alternate functions including TSC_G4_IO1, TIM1_CH2, USART1_TX, TIM15_BKIN, TIM2_CH3 and HRTIM1_CHA2."
      },
      {
        "number": "20",
        "name": "PA10",
        "type": "bidirectional",
        "description": "Five-volt tolerant (FT) I/O with alternate functions including TIM17_BKIN, TSC_G4_IO2, TIM1_CH3, USART1_RX, COMP6_OUT, TIM2_CH4 and HRTIM1_CHB1."
      },
      {
        "number": "21",
        "name": "PA11",
        "type": "bidirectional",
        "description": "Five-volt tolerant (FT) I/O with alternate functions including TIM1_CH1N, USART1_CTS, CAN_RX, TIM1_CH4, TIM1_BKIN2 and HRTIM1_CHB2."
      },
      {
        "number": "22",
        "name": "PA12",
        "type": "bidirectional",
        "description": "Five-volt tolerant (FT) I/O with alternate functions including TIM16_CH1, TIM1_CH2N, USART1_RTS_DE, COMP2_OUT, CAN_TX, TIM1_ETR and HRTIM1_FLT1."
      },
      {
        "number": "23",
        "name": "PA13",
        "type": "bidirectional",
        "description": "Five-volt tolerant (FT) I/O with alternate functions including JTMS/SWDAT, TIM16_CH1N, TSC_G4_IO3, IR_OUT and USART3_CTS."
      },
      {
        "number": "24",
        "name": "PA14",
        "type": "bidirectional",
        "description": "Five-volt tolerant, FM+ capable (FTf) I/O with alternate functions including JTCK/SWCLK, TSC_G4_IO4, I2C1_SDA, TIM1_BKIN and USART2_TX."
      },
      {
        "number": "25",
        "name": "PA15",
        "type": "bidirectional",
        "description": "Five-volt tolerant, FM+ capable (FTf) I/O with alternate functions including JTDI, TIM2_CH1/TIM2_ETR, TSC_SYNC, I2C1_SCL, SPI1_NSS, USART2_RX and HRTIM1_FLT2."
      },
      {
        "number": "26",
        "name": "PB3",
        "type": "bidirectional",
        "description": "Five-volt tolerant (FT) I/O with alternate functions including JTDO/TRACESWO, TIM2_CH2, TSC_G5_IO1, SPI1_SCK, USART2_TX and HRTIM1_SCOUT."
      },
      {
        "number": "27",
        "name": "PB4",
        "type": "bidirectional",
        "description": "Five-volt tolerant (FT) I/O with alternate functions including NJTRST, TIM16_CH1, TIM3_CH1, TSC_G5_IO2, SPI1_MISO and USART2_RX."
      },
      {
        "number": "28",
        "name": "PB5",
        "type": "bidirectional",
        "description": "Five-volt tolerant (FT) I/O with alternate functions including TIM16_BKIN, TIM3_CH2, I2C1_SMBA, SPI1_MOSI, USART2_CK and TIM17_CH1."
      },
      {
        "number": "29",
        "name": "PB6",
        "type": "bidirectional",
        "description": "Five-volt tolerant, FM+ capable (FTf) I/O with alternate functions including TIM16_CH1N, TSC_G5_IO3, I2C1_SCL, USART1_TX and HRTIM1_SCIN."
      },
      {
        "number": "30",
        "name": "PB7",
        "type": "bidirectional",
        "description": "Five-volt tolerant, FM+ capable (FTf) I/O with alternate functions including TIM17_CH1N, TSC_G5_IO4, I2C1_SDA, USART1_RX and TIM3_CH4."
      },
      {
        "number": "31",
        "name": "BOOT0",
        "type": "input",
        "description": "Dedicated BOOT0 pin that selects the boot memory (Flash, system memory or SRAM) according to the boot configuration."
      },
      {
        "number": "32",
        "name": "VSS",
        "type": "power_in",
        "description": "Digital ground."
      },
      {
        "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": [
          "extractor flagged: On UFQFPN32 the analog supply and reference share one pin each (VDDA/VREF+ and VSSA/VREF-); a separa; Datasheet note 3 says PA4, PA5 and PA6 have reduced touch sensing sensitivity and are recommended fo; The extracted text gives the oscillator range (4 to 32 MHz) from the Features list only; the pin ele",
          "exposed pad 33 added from the footprint"
        ],
        "pages_sent": 48,
        "cost_usd": 0.2265,
        "at": "2026-10-11T16:06:34"
      },
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        "pages": 125,
        "sha256": "4727fd8b6c87c9e0",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 33,
        "described": 33,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
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}