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STM32L412KBU6

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STMicroelectronics Microcontrollers (MCU/MPU/SOC), UFQFPN-32(5x5). Pinout checked against ST's open pin data, KiCad symbol/footprint/3D.

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docs stm32l412kbu6: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
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README.md Initial commit: component/stm32l412kbu6 · Ray 4d ago
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stm32l412kbu6-etched.glb stm32l412kbu6: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
stm32l412kbu6-etched.step stm32l412kbu6: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 3d ago
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STM32L412KBU6

STMicroelectronics · Microcontrollers (MCU/MPU/SOC) · UFQFPN-32(5x5)

STM32L412KBU6 from STMicroelectronics, in a UFQFPN-32(5x5). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model, then checked against ST open pin data); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VDD power_in Main supply voltage (1.71 V to 3.6 V).
2 PC14-OSC32_IN bidirectional Port C pin 14, 32 kHz oscillator input; alternate functions: EVENTOUT; additional functions: OSC32_IN.
3 PC15-OSC32_OUT bidirectional Port C pin 15, 32 kHz oscillator output; alternate functions: EVENTOUT; additional functions: OSC32_OUT.
4 NRST bidirectional Active low reset input with embedded weak pull-up resistor.
5 VDDA/VREF+ power_in Analog supply voltage (1.62 V to 3.6 V when ADC/COMP used) and positive reference for ADC.
6 PA0 bidirectional Port A pin 0; alternate functions: TIM2_CH1, USART2_CTS, COMP1_OUT, TIM2_ETR, EVENTOUT; additional functions: OPAMP1_VINP, COMP1_INM, ADC1_IN5, RTC_TAMP2/WKUP1.
7 PA1 bidirectional Port A pin 1; alternate functions: TIM2_CH2, I2C1_SMBA, SPI1_SCK, USART2_RTS_DE, TIM15_CH1N, EVENTOUT; additional functions: OPAMP1_VINM, COMP1_INP, ADC1_IN6.
8 PA2 bidirectional Port A pin 2; alternate functions: TIM2_CH3, USART2_TX, LPUART1_TX, QUADSPI_BK1_NCS, TIM15_CH1, EVENTOUT; additional functions: ADC12_IN7, WKUP4/LSCO.
9 PA3 bidirectional Port A pin 3 (3.6 V tolerant); alternate functions: TIM2_CH4, USART2_RX, LPUART1_RX, QUADSPI_CLK, TIM15_CH2, EVENTOUT; additional functions: OPAMP1_VOUT, ADC12_IN8.
10 PA4 bidirectional Port A pin 4 (3.6 V tolerant); alternate functions: SPI1_NSS, USART2_CK, LPTIM2_OUT, EVENTOUT; additional functions: COMP1_INM, ADC12_IN9.
11 PA5 bidirectional Port A pin 5 (3.6 V tolerant); alternate functions: TIM2_CH1, TIM2_ETR, SPI1_SCK, LPTIM2_ETR, EVENTOUT; additional functions: COMP1_INM, ADC12_IN10.
12 PA6 bidirectional Port A pin 6; alternate functions: TIM1_BKIN, SPI1_MISO, COMP1_OUT, USART3_CTS, LPUART1_CTS, QUADSPI_BK1_IO3, TIM16_CH1, EVENTOUT; additional functions: ADC12_IN11.
13 PA7 bidirectional Port A pin 7 (FM+ capable); alternate functions: TIM1_CH1N, I2C3_SCL, SPI1_MOSI, QUADSPI_BK1_IO2, EVENTOUT; additional functions: ADC12_IN12.
14 PB0 bidirectional Port B pin 0; alternate functions: TRACED0, TIM1_CH2N, SPI1_NSS, USART3_CK, QUADSPI_BK1_IO1, COMP1_OUT, EVENTOUT; additional functions: ADC12_IN15.
15 PB1 bidirectional Port B pin 1; alternate functions: TRACED1, TIM1_CH3N, USART3_RTS_DE, LPUART1_RTS_DE, QUADSPI_BK1_IO0, LPTIM2_IN1, EVENTOUT; additional functions: COMP1_INM, ADC12_IN16.
16 VSS power_in Ground (0 V).
17 VDD power_in Main supply voltage (1.71 V to 3.6 V).
18 PA8 bidirectional Port A pin 8; alternate functions: MCO, TIM1_CH1, USART1_CK, LPTIM2_OUT, EVENTOUT.
19 PA9 bidirectional Port A pin 9 (FM+ capable); alternate functions: TIM1_CH2, I2C1_SCL, USART1_TX, TIM15_BKIN, EVENTOUT.
20 PA10 bidirectional Port A pin 10 (FM+ capable); alternate functions: TIM1_CH3, I2C1_SDA, USART1_RX, USB_CRS_SYNC, EVENTOUT.
21 PA11 bidirectional Port A pin 11 (USB function); alternate functions: TIM1_CH4, TIM1_BKIN2, SPI1_MISO, COMP1_OUT, USART1_CTS, USB_DM, TIM1_BKIN2_COMP1, EVENTOUT.
22 PA12 bidirectional Port A pin 12 (USB function); alternate functions: TIM1_ETR, SPI1_MOSI, USART1_RTS_DE, USB_DP, EVENTOUT.
23 PA13 bidirectional Port A pin 13, JTAG test mode select / SWD I/O; alternate functions: JTMS/SWDIO, IR_OUT, USB_NOE, EVENTOUT.
24 PA14 bidirectional Port A pin 14, JTAG test clock / SWD clock; alternate functions: JTCK/SWCLK, LPTIM1_OUT, I2C1_SMBA, EVENTOUT.
25 PA15 bidirectional Port A pin 15, JTAG test data in; alternate functions: JTDI, TIM2_CH1, TIM2_ETR, USART2_RX, SPI1_NSS, USART3_RTS_DE, TSC_G3_IO1, EVENTOUT.
26 PB3 bidirectional Port B pin 3, JTAG test data out / trace serial wire output; alternate functions: JTDO/TRACESWO, TIM2_CH2, SPI1_SCK, USART1_RTS_DE, EVENTOUT.
27 PB4 bidirectional Port B pin 4, JTAG nRESET (FM+ capable); alternate functions: NJTRST, I2C3_SDA, SPI1_MISO, USART1_CTS, TSC_G2_IO1, EVENTOUT.
28 PB5 bidirectional Port B pin 5; alternate functions: TRACED2, LPTIM1_IN1, I2C1_SMBA, SPI1_MOSI, USART1_CK, TSC_G2_IO2, TIM16_BKIN, EVENTOUT.
29 PB6 bidirectional Port B pin 6 (FM+ capable); alternate functions: TRACED3, LPTIM1_ETR, I2C1_SCL, USART1_TX, TSC_G2_IO3, TIM16_CH1N, EVENTOUT.
30 PB7 bidirectional Port B pin 7 (FM+ capable, PVD input); alternate functions: TRACECK, LPTIM1_IN2, I2C1_SDA, USART1_RX, TSC_G2_IO4, EVENTOUT; additional functions: PVD_IN.
31 PH3-BOOT0 bidirectional Port H pin 3, boot mode selection; alternate functions: EVENTOUT.
32 VSS power_in Ground (0 V).
33 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package UFQFPN-32(5x5)
Category Embedded Processors & Controllers
Pins 33

CAD (KiCad official)

  • Symbol: STM32L412KBU6
  • Footprint: Package_DFN_QFN:UFQFPN-32-1EP_5x5mm_P0.5mm_EP3.5x3.5mm
  • 3D model: UFQFPN-32(5x5) (KiCad packages3D, STEP)
  • 3D model files: stm32l412kbu6-etched.step / stm32l412kbu6-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); stm32l412kbu6.step / stm32l412kbu6.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (193 pp, sha256 5104ae3be2936485, retrieved 2026-10-01, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF