# STM32F427AIH6

**STMicroelectronics** · Microcontrollers (MCU/MPU/SOC) · UFBGA-169

STM32F427AIH6 from STMicroelectronics, in a UFBGA-169. 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 |
|---|---|---|---|
| A1 | NC | unconnected | Corner ball, not bonded internally, and should be left not connected on the PCB. |
| A2 | PI6 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM8_CH2, FMC_D28, DCMI_D6, LCD_B6, EVENTOUT. |
| A3 | PI5 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM8_CH1, FMC_NBL3, DCMI_VSYNC, LCD_B5, EVENTOUT. |
| A4 | PE1 | bidirectional | 5 V-tolerant I/O (FT); alternate functions UART8_Tx, FMC_NBL1, DCMI_D3, EVENTOUT. |
| A5 | BOOT0 | input | Dedicated BOOT0 pin (input, also used as VPP) that selects the boot mode. |
| A6 | PB4 | bidirectional | 5 V-tolerant I/O (FT); NJTRST after reset; alternate functions TIM3_CH1, SPI1_MISO, SPI3_MISO, I2S3ext_SD, EVENTOUT. |
| A7 | PG12 | bidirectional | 5 V-tolerant I/O (FT); alternate functions SPI6_MISO, USART6_RTS, LCD_B4, FMC_NE4, LCD_B1, EVENTOUT. |
| A8 | PD7 | bidirectional | 5 V-tolerant I/O (FT); alternate functions USART2_CK, FMC_NE1/FMC_NCE2, EVENTOUT. |
| A9 | PD3 | bidirectional | 5 V-tolerant I/O (FT); alternate functions SPI2_SCK/I2S2_CK, USART2_CTS, FMC_CLK, DCMI_D5, LCD_G7, EVENTOUT. |
| A10 | PC12 | bidirectional | 5 V-tolerant I/O (FT); alternate functions SPI3_MOSI/I2S3_SD, USART3_CK, UART5_TX, SDIO_CK, DCMI_D9, EVENTOUT. |
| A11 | PA14 | bidirectional | 5 V-tolerant I/O (FT); JTCK-SWCLK after reset, with EVENTOUT. |
| A12 | PI3 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM8_ETR, SPI2_MOSI/I2S2_SD, FMC_D27, DCMI_D10, EVENTOUT. |
| A13 | NC | unconnected | Corner ball, not bonded internally, and should be left not connected on the PCB. |
| B1 | PI7 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM8_CH3, FMC_D29, DCMI_D7, LCD_B7, EVENTOUT. |
| B2 | PE2 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TRACECLK, SPI4_SCK, SAI1_MCLK_A, ETH_MII_TXD3, FMC_A23, EVENTOUT. |
| B3 | PI4 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM8_BKIN, FMC_NBL2, DCMI_D5, LCD_B4, EVENTOUT. |
| B4 | PE0 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM4_ETR, UART8_RX, FMC_NBL0, DCMI_D2, EVENTOUT. |
| B5 | PB7 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM4_CH2, I2C1_SDA, USART1_RX, FMC_NL, DCMI_VSYNC, EVENTOUT. |
| B6 | PB3 | bidirectional | 5 V-tolerant I/O (FT); JTDO/TRACESWO after reset; alternate functions TIM2_CH2, SPI1_SCK, SPI3_SCK/I2S3_CK, EVENTOUT. |
| B7 | PG11 | bidirectional | 5 V-tolerant I/O (FT); alternate functions ETH_MII_TX_EN/ETH_RMII_TX_EN, FMC_NCE4_2, DCMI_D3, LCD_B3, EVENTOUT. |
| B8 | PD6 | bidirectional | 5 V-tolerant I/O (FT); alternate functions SPI3_MOSI/I2S3_SD, SAI1_SD_A, USART2_RX, FMC_NWAIT, DCMI_D10, LCD_B2, EVENTOUT. |
| B9 | PD2 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM3_ETR, UART5_RX, SDIO_CMD, DCMI_D11, EVENTOUT. |
| B10 | PC11 | bidirectional | 5 V-tolerant I/O (FT); alternate functions I2S3ext_SD, SPI3_MISO, USART3_RX, UART4_RX, SDIO_D3, DCMI_D4, EVENTOUT. |
| B11 | PA15 | bidirectional | 5 V-tolerant I/O (FT); JTDI after reset; alternate functions TIM2_CH1/TIM2_ETR, SPI1_NSS, SPI3_NSS/I2S3_WS, EVENTOUT. |
| B12 | PI2 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM8_CH4, SPI2_MISO, I2S2ext_SD, FMC_D26, DCMI_D9, LCD_G7, EVENTOUT. |
| B13 | PI0 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM5_CH4, SPI2_NSS/I2S2_WS, FMC_D24, DCMI_D13, LCD_G5, EVENTOUT. |
| C1 | PE3 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TRACED0, SAI1_SD_B, FMC_A19, EVENTOUT. |
| C2 | PE4 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TRACED1, SPI4_NSS, SAI1_FS_A, FMC_A20, DCMI_D4, LCD_B0, EVENTOUT. |
| C3 | PDR_ON | power_in | Power-down reset control pin (type S in the pin table), used for PDR_ON control with internal reset OFF. |
| C4 | PB9 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM4_CH4, TIM11_CH1, I2C1_SDA, SPI2_NSS/I2S2_WS, CAN1_TX, SDIO_D5, DCMI_D7, LCD_B7, EVENTOUT. |
| C5 | PB6 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM4_CH1, I2C1_SCL, USART1_TX, CAN2_TX, FMC_SDNE1, DCMI_D5, EVENTOUT. |
| C6 | PG15 | bidirectional | 5 V-tolerant I/O (FT); alternate functions USART6_CTS, FMC_SDNCAS, DCMI_D13, EVENTOUT. |
| C7 | PG10 | bidirectional | 5 V-tolerant I/O (FT); alternate functions LCD_G3, FMC_NCE4_1/FMC_NE3, DCMI_D2, LCD_B2, EVENTOUT. |
| C8 | PD5 | bidirectional | 5 V-tolerant I/O (FT); alternate functions USART2_TX, FMC_NWE, EVENTOUT. |
| C9 | PD1 | bidirectional | 5 V-tolerant I/O (FT); alternate functions CAN1_TX, FMC_D3, EVENTOUT. |
| C10 | PC10 | bidirectional | 5 V-tolerant I/O (FT); alternate functions SPI3_SCK/I2S3_CK, USART3_TX, UART4_TX, SDIO_D2, DCMI_D8, LCD_R2, EVENTOUT. |
| C11 | PI1 | bidirectional | 5 V-tolerant I/O (FT); alternate functions SPI2_SCK/I2S2_CK, FMC_D25, DCMI_D8, LCD_G6, EVENTOUT. |
| C12 | PH15 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM8_CH3N, FMC_D23, DCMI_D11, LCD_G4, EVENTOUT. |
| C13 | PH14 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM8_CH2N, FMC_D22, DCMI_D4, LCD_G3, EVENTOUT. |
| D1 | PE5 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TRACED2, TIM9_CH1, SPI4_MISO, SAI1_SCK_A, FMC_A21, DCMI_D6, LCD_G0, EVENTOUT. |
| D2 | PE6 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TRACED3, TIM9_CH2, SPI4_MOSI, SAI1_SD_A, FMC_A22, DCMI_D7, LCD_G1, EVENTOUT. |
| D3 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| D4 | PB8 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM4_CH3, TIM10_CH1, I2C1_SCL, CAN1_RX, ETH_MII_TXD3, SDIO_D4, DCMI_D6, LCD_B6, EVENTOUT. |
| D5 | PB5 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM3_CH2, I2C1_SMBA, SPI1_MOSI, SPI3_MOSI/I2S3_SD, CAN2_RX, OTG_HS_ULPI_D7, ETH_PPS_OUT, FMC_SDCKE1, DCMI_D10, EVENTOUT. |
| D6 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| D7 | VSS | power_in | Ground pin of the MCU. |
| D8 | PD4 | bidirectional | 5 V-tolerant I/O (FT); alternate functions USART2_RTS, FMC_NOE, EVENTOUT. |
| D9 | PD0 | bidirectional | 5 V-tolerant I/O (FT); alternate functions CAN1_RX, FMC_D2, EVENTOUT. |
| D10 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| D11 | VSS | power_in | Ground pin of the MCU. |
| D12 | VCAP_2 | power_in | VCAP2 pin of the internal voltage regulator, connected to its external capacitor (see Section 6.3.2). |
| D13 | PH13 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM8_CH1N, CAN1_TX, FMC_D21, LCD_G2, EVENTOUT. |
| E1 | PC14 | bidirectional | 5 V-tolerant I/O (FT, except oscillator mode) supplied through the power switch, limited to 2 MHz with 30 pF load and not usable as a current source; also OSC32_IN. |
| E2 | PI9 | bidirectional | 5 V-tolerant I/O (FT); alternate functions CAN1_RX, FMC_D30, LCD_VSYNC, EVENTOUT. |
| E3 | PI10 | bidirectional | 5 V-tolerant I/O (FT); alternate functions ETH_MII_RX_ER, FMC_D31, LCD_HSYNC, EVENTOUT. |
| E4 | PC13 | bidirectional | 5 V-tolerant I/O (FT) supplied through the power switch, limited to 2 MHz with 30 pF load and 3 mA sink; also TAMP_1. |
| E5 | VBAT | power_in | Power supply for the RTC, 20x32-bit backup registers and optional 4 KB backup SRAM. |
| E6 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| E7 | VSS | power_in | Ground pin of the MCU. |
| E8 | PA9 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_CH2, I2C3_SMBA, USART1_TX, DCMI_D0, EVENTOUT; also OTG_FS_VBUS. |
| E9 | PA10 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_CH3, USART1_RX, OTG_FS_ID, DCMI_D1, EVENTOUT. |
| E10 | PA11 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_CH4, USART1_CTS, CAN1_RX, LCD_R4, OTG_FS_DM, EVENTOUT. |
| E11 | PA12 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_ETR, USART1_RTS, CAN1_TX, LCD_R5, OTG_FS_DP, EVENTOUT. |
| E12 | PA13 | bidirectional | 5 V-tolerant I/O (FT); JTMS-SWDIO after reset, with EVENTOUT. |
| E13 | PA8 | bidirectional | 5 V-tolerant I/O (FT); alternate functions MCO1, TIM1_CH1, I2C3_SCL, USART1_CK, OTG_FS_SOF, LCD_R6, EVENTOUT. |
| F1 | PC15 | bidirectional | 5 V-tolerant I/O (FT, except oscillator mode) supplied through the power switch, limited to 2 MHz with 30 pF load; also OSC32_OUT. |
| F2 | PF0 | bidirectional | 5 V-tolerant I/O (FT); alternate functions I2C2_SDA, FMC_A0, EVENTOUT. |
| F3 | PF1 | bidirectional | 5 V-tolerant I/O (FT); alternate functions I2C2_SCL, FMC_A1, EVENTOUT. |
| F4 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| F5 | VSS | power_in | Ground pin of the MCU. |
| F6 | VSS | power_in | Ground pin of the MCU. |
| F7 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| F8 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| F9 | PC6 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM3_CH1, TIM8_CH1, I2S2_MCK, USART6_TX, SDIO_D6, DCMI_D0, LCD_HSYNC, EVENTOUT. |
| F10 | PC7 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM3_CH2, TIM8_CH2, I2S3_MCK, USART6_RX, SDIO_D7, DCMI_D1, LCD_G6, EVENTOUT. |
| F11 | PC8 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM3_CH3, TIM8_CH3, USART6_CK, SDIO_D0, DCMI_D2, EVENTOUT. |
| F12 | PC9 | bidirectional | 5 V-tolerant I/O (FT); alternate functions MCO2, TIM3_CH4, TIM8_CH4, I2C3_SDA, I2S_CKIN, SDIO_D1, DCMI_D3, EVENTOUT. |
| F13 | PG8 | bidirectional | 5 V-tolerant I/O (FT); alternate functions SPI6_NSS, USART6_RTS, ETH_PPS_OUT, FMC_SDCLK, EVENTOUT. |
| G1 | PH1 | bidirectional | Oscillator-mode pin (OSC_OUT) with EVENTOUT; 5 V tolerance does not apply in oscillator mode. |
| G2 | PH0 | bidirectional | Oscillator-mode pin (OSC_IN) with EVENTOUT; 5 V tolerance does not apply in oscillator mode. |
| G3 | PF4 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions FMC_A4, EVENTOUT; ADC3_IN14. |
| G4 | PF3 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions FMC_A3, EVENTOUT; ADC3_IN9. |
| G5 | PF2 | bidirectional | 5 V-tolerant I/O (FT); alternate functions I2C2_SMBA, FMC_A2, EVENTOUT. |
| G6 | PC0 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions OTG_HS_ULPI_STP, FMC_SDNWE, EVENTOUT; ADC123_IN10. |
| G7 | VSS | power_in | Ground pin of the MCU. |
| G8 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| G9 | VSS | power_in | Ground pin of the MCU. |
| G10 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| G11 | PG6 | bidirectional | 5 V-tolerant I/O (FT); alternate functions FMC_INT2, DCMI_D12, LCD_R7, EVENTOUT. |
| G12 | PG7 | bidirectional | 5 V-tolerant I/O (FT); alternate functions USART6_CK, FMC_INT3, DCMI_D13, LCD_CLK, EVENTOUT. |
| G13 | PG5 | bidirectional | 5 V-tolerant I/O (FT); alternate functions FMC_A15/FMC_BA1, EVENTOUT. |
| H1 | PF10 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions FMC_INTR, DCMI_D11, LCD_DE, EVENTOUT; ADC3_IN8. |
| H2 | NRST | bidirectional | Bidirectional reset pin with weak pull-up resistor. |
| H3 | PF5 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions FMC_A5, EVENTOUT; ADC3_IN15. |
| H4 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| H5 | PC1 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions ETH_MDC, EVENTOUT; ADC123_IN11. |
| H6 | PC2 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions SPI2_MISO, I2S2ext_SD, OTG_HS_ULPI_DIR, ETH_MII_TXD2, FMC_SDNE0, EVENTOUT; ADC123_IN12. |
| H7 | PC3 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions SPI2_MOSI/I2S2_SD, OTG_HS_ULPI_NXT, ETH_MII_TX_CLK, FMC_SDCKE0, EVENTOUT; ADC123_IN13. |
| H8 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| H9 | PE13 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_CH3, SPI4_MISO, FMC_D10, LCD_DE, EVENTOUT. |
| H10 | PD11 | bidirectional | 5 V-tolerant I/O (FT); alternate functions USART3_CTS, FMC_A16, EVENTOUT. |
| H11 | PD14 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM4_CH3, FMC_D0, EVENTOUT. |
| H12 | PG4 | bidirectional | 5 V-tolerant I/O (FT); alternate functions FMC_A14/FMC_BA0, EVENTOUT. |
| H13 | PG2 | bidirectional | 5 V-tolerant I/O (FT); alternate functions FMC_A12, EVENTOUT. |
| J1 | VSSA | power_in | Ground for the analog section (ADC, DAC, reference). |
| J2 | VREF- | power_in | Negative reference voltage for the ADC (VREF-). |
| J3 | VREF+ | power_in | Positive reference voltage for the ADC (VREF+). |
| J4 | VDDA | power_in | Analog supply voltage for the ADC, DAC and reset blocks. |
| J5 | PA0 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions TIM2_CH1/TIM2_ETR, TIM5_CH1, TIM8_ETR, USART2_CTS, UART4_TX, ETH_MII_CRS, EVENTOUT; ADC123_IN0/WKUP; used as internal reset when BYPASS_REG is tied to VDD. |
| J6 | VSS | power_in | Ground pin of the MCU. |
| J7 | VSS | power_in | Ground pin of the MCU. |
| J8 | PE8 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_CH1N, UART7_Tx, FMC_D5, EVENTOUT. |
| J9 | PE14 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_CH4, SPI4_MOSI, FMC_D11, LCD_CLK, EVENTOUT. |
| J10 | VSS | power_in | Ground pin of the MCU. |
| J11 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| J12 | PD15 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM4_CH4, FMC_D1, EVENTOUT. |
| J13 | PD12 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM4_CH1, USART3_RTS, FMC_A17, EVENTOUT. |
| K1 | PA1 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions TIM2_CH2, TIM5_CH2, USART2_RTS, UART4_RX, ETH_MII_RX_CLK/ETH_RMII_REF_CLK, EVENTOUT; ADC123_IN1. |
| K2 | PA2 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions TIM2_CH3, TIM5_CH3, TIM9_CH1, USART2_TX, ETH_MDIO, EVENTOUT; ADC123_IN2. |
| K3 | PA3 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions TIM2_CH4, TIM5_CH4, TIM9_CH2, USART2_RX, OTG_HS_ULPI_D0, ETH_MII_COL, LCD_B5, EVENTOUT; ADC123_IN3. |
| K4 | PA7 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions TIM1_CH1N, TIM3_CH2, TIM8_CH1N, SPI1_MOSI, TIM14_CH1, ETH_MII_RX_DV/ETH_RMII_CRS_DV, EVENTOUT; ADC12_IN7. |
| K5 | PB1 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions TIM1_CH3N, TIM3_CH4, TIM8_CH3N, LCD_R6, OTG_HS_ULPI_D2, ETH_MII_RXD3, EVENTOUT; ADC12_IN9. |
| K6 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| K7 | PF14 | bidirectional | 5 V-tolerant I/O (FT); alternate functions FMC_A8, EVENTOUT. |
| K8 | PE9 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_CH1, FMC_D6, EVENTOUT. |
| K9 | PE15 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_BKIN, FMC_D12, LCD_R7, EVENTOUT. |
| K10 | PH9 | bidirectional | 5 V-tolerant I/O (FT); alternate functions I2C3_SMBA, TIM12_CH2, FMC_D17, DCMI_D0, LCD_R3, EVENTOUT. |
| K11 | PD10 | bidirectional | 5 V-tolerant I/O (FT); alternate functions USART3_CK, FMC_D15, LCD_B3, EVENTOUT. |
| K12 | PD13 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM4_CH2, FMC_A18, EVENTOUT. |
| K13 | PD9 | bidirectional | 5 V-tolerant I/O (FT); alternate functions USART3_RX, FMC_D14, EVENTOUT. |
| L1 | PH3 | bidirectional | 5 V-tolerant I/O (FT); alternate functions ETH_MII_COL, FMC_SDNE0, LCD_R1, EVENTOUT. |
| L2 | PH2 | bidirectional | 5 V-tolerant I/O (FT); alternate functions ETH_MII_CRS, FMC_SDCKE0, LCD_R0, EVENTOUT. |
| L3 | PH5 | bidirectional | 5 V-tolerant I/O (FT); alternate functions I2C2_SDA, SPI5_NSS, FMC_SDNWE, EVENTOUT. |
| L4 | PC4 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions ETH_MII_RXD0/ETH_RMII_RXD0, EVENTOUT; ADC12_IN14. |
| L5 | PB2 | bidirectional | 5 V-tolerant I/O (FT); BOOT1 function on this pin with EVENTOUT. |
| L6 | VDD | power_in | Supply pin for the MCU, 1.7 V to 3.6 V application supply and I/Os. |
| L7 | PF15 | bidirectional | 5 V-tolerant I/O (FT); alternate functions FMC_A9, EVENTOUT. |
| L8 | PE10 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_CH2N, FMC_D7, EVENTOUT. |
| L9 | PB10 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM2_CH3, I2C2_SCL, SPI2_SCK/I2S2_CK, USART3_TX, OTG_HS_ULPI_D3, ETH_MII_RX_ER, LCD_G4, EVENTOUT. |
| L10 | PH8 | bidirectional | 5 V-tolerant I/O (FT); alternate functions I2C3_SDA, FMC_D16, DCMI_HSYNC, LCD_R2, EVENTOUT. |
| L11 | PH12 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM5_CH3, FMC_D20, DCMI_D3, LCD_R6, EVENTOUT. |
| L12 | PD8 | bidirectional | 5 V-tolerant I/O (FT); alternate functions USART3_TX, FMC_D13, EVENTOUT. |
| L13 | PB15 | bidirectional | 5 V-tolerant I/O (FT); alternate functions RTC_REFIN, TIM1_CH3N, TIM8_CH3N, SPI2_MOSI/I2S2_SD, TIM12_CH2, OTG_HS_DP, EVENTOUT. |
| M1 | BYPASS_REG | input | Regulator bypass control input (5 V-tolerant); tying it to VDD selects Regulator OFF/internal reset ON mode. |
| M2 | PH4 | bidirectional | 5 V-tolerant I/O (FT); alternate functions I2C2_SCL, OTG_HS_ULPI_NXT, EVENTOUT. |
| M3 | PA5 | bidirectional | 3.3 V-tolerant I/O (TTa) connected directly to ADC; alternate functions TIM2_CH1/TIM2_ETR, TIM8_CH1N, SPI1_SCK, OTG_HS_ULPI_CK, EVENTOUT; ADC12_IN5/DAC_OUT2. |
| M4 | PC5 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions ETH_MII_RXD1/ETH_RMII_RXD1, EVENTOUT; ADC12_IN15. |
| M5 | PF11 | bidirectional | 5 V-tolerant I/O (FT); alternate functions SPI5_MOSI, FMC_SDNRAS, DCMI_D12, EVENTOUT. |
| M6 | PF13 | bidirectional | 5 V-tolerant I/O (FT); alternate functions FMC_A7, EVENTOUT. |
| M7 | PG1 | bidirectional | 5 V-tolerant I/O (FT); alternate functions FMC_A11, EVENTOUT. |
| M8 | PE11 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_CH2, SPI4_NSS, FMC_D8, LCD_G3, EVENTOUT. |
| M9 | PB11 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM2_CH4, I2C2_SDA, USART3_RX, OTG_HS_ULPI_D4, ETH_MII_TX_EN/ETH_RMII_TX_EN, LCD_G5, EVENTOUT. |
| M10 | PH7 | bidirectional | 5 V-tolerant I/O (FT); alternate functions I2C3_SCL, SPI5_MISO, ETH_MII_RXD3, FMC_SDCKE1, DCMI_D9, EVENTOUT. |
| M11 | PH11 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM5_CH2, FMC_D19, DCMI_D2, LCD_R5, EVENTOUT. |
| M12 | PB13 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_CH1N, SPI2_SCK/I2S2_CK, USART3_CTS, CAN2_TX, OTG_HS_ULPI_D6, ETH_MII_TXD1/ETH_RMII_TXD1, EVENTOUT; OTG_HS_VBUS. |
| M13 | PB14 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_CH2N, TIM8_CH2N, SPI2_MISO, I2S2ext_SD, USART3_RTS, TIM12_CH1, OTG_HS_DM, EVENTOUT. |
| N1 | NC | unconnected | Corner ball, not bonded internally, and should be left not connected on the PCB. |
| N2 | PA4 | bidirectional | 3.3 V-tolerant I/O (TTa) connected directly to ADC; alternate functions SPI1_NSS, SPI3_NSS/I2S3_WS, USART2_CK, OTG_HS_SOF, DCMI_HSYNC, LCD_VSYNC, EVENTOUT; ADC12_IN4/DAC_OUT1. |
| N3 | PA6 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions TIM1_BKIN, TIM3_CH1, TIM8_BKIN, SPI1_MISO, TIM13_CH1, DCMI_PIXCLK, LCD_G2, EVENTOUT; ADC12_IN6. |
| N4 | PB0 | bidirectional | 5 V-tolerant I/O (FT, except analog mode); alternate functions TIM1_CH2N, TIM3_CH3, TIM8_CH2N, LCD_R3, OTG_HS_ULPI_D1, ETH_MII_RXD2, EVENTOUT; ADC12_IN8. |
| N5 | PF12 | bidirectional | 5 V-tolerant I/O (FT); alternate functions FMC_A6, EVENTOUT. |
| N6 | PG0 | bidirectional | 5 V-tolerant I/O (FT); alternate functions FMC_A10, EVENTOUT. |
| N7 | PE7 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_ETR, UART7_Rx, FMC_D4, EVENTOUT. |
| N8 | PE12 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_CH3N, SPI4_SCK, FMC_D9, LCD_B4, EVENTOUT. |
| N9 | VCAP_1 | power_in | VCAP1 pin of the internal voltage regulator, connected to its external capacitor (see Section 6.3.2). |
| N10 | PH6 | bidirectional | 5 V-tolerant I/O (FT); alternate functions I2C2_SMBA, SPI5_SCK, TIM12_CH1, ETH_MII_RXD2, FMC_SDNE1, DCMI_D8, EVENTOUT. |
| N11 | PH10 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM5_CH1, FMC_D18, DCMI_D1, LCD_R4, EVENTOUT. |
| N12 | PB12 | bidirectional | 5 V-tolerant I/O (FT); alternate functions TIM1_BKIN, I2C2_SMBA, SPI2_NSS/I2S2_WS, USART3_CK, CAN2_RX, OTG_HS_ULPI_D5, ETH_MII_TXD0/ETH_RMII_TXD0, OTG_HS_ID, EVENTOUT. |
| N13 | NC | unconnected | Corner ball, not bonded internally, and should be left not connected on the PCB. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | UFBGA-169 |
| Category | Embedded Processors & Controllers |
| Pins | 169 |

## CAD (KiCad official)

- Symbol: `STM32F427AIH6`
- Footprint: `Package_BGA:UFBGA-169_7x7mm_Layout13x13_P0.5mm`
- 3D model: UFBGA-169 (KiCad packages3D, STEP)
- 3D model files: `stm32f427aih6-etched.step` / `stm32f427aih6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm32f427aih6.step` / `stm32f427aih6.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588895693394087936) (240 pp, sha256 `2aa9c826cc4304f2`, retrieved 2026-10-07, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (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](docs/stm32f427aih6-datasheet.pdf)