# STM32 Nucleo-64 NUCLEO-F446RE (MB1136)

> ST NUCLEO-F446RE (MB1136): STM32F446RET6 Cortex-M4F 180 MHz, 512 KB flash, 128 KB SRAM; Arduino Uno V3 headers + two 38-pin ST morpho headers exposing every I/O; on-board ST-LINK/V2-1 (SWD, virtual COM, mass storage); user LED/button, reset; powered from USB, VIN 7–12 V, E5V or 3.3 V; 70×82.5 mm. Common robotics motor-control/CAN board.

- Manufacturer: STMicroelectronics
- Part number: NUCLEO-F446RE
- Category: Development boards
- Canonical page: https://www.xirkit.io/products/stmicroelectronics-stm32-nucleo-64-nucleo-f446re-mb1136-2179
- Pinout: https://www.xirkit.io/products/stmicroelectronics-stm32-nucleo-64-nucleo-f446re-mb1136-2179/pinout
- Structured JSON: https://www.xirkit.io/products/stmicroelectronics-stm32-nucleo-64-nucleo-f446re-mb1136-2179/data.json
- Source: Xirkit structured parts catalog — every value traced to a cited document; unknowns are explicit.

## Key specifications

| Property | Value |
| --- | --- |
| Main chip | STM32F446RET6 |
| Chips on board | STM32F446RET6 |
| Exposed GPIO | 50 |
| Documented board pins | 114 |
| I/O voltage | 3.3 V |
| Supply voltage | 1.65–12 V |
| Flash | 512 KB |
| SRAM | 128 KB |
| Interfaces | gpio, spi, uart, qspi, sdio, camera, event, clock, timer, i2c, i2s, debug, can, audio, memory, adc, control, led, usb, dac, cec, button, rtc, wakeup, arduino, pwm |
| Frameworks | STM32Cube, Arm Mbed, Arduino (STM32duino) |
| Dimensions | 70 × 82.5 mm |
| Certifications | FCC / ISED |

## Pinout (114 pins, 72 with electrical limits)

| Pin | Position | Kind | Chip pad | Functions | VIH | VIL | VOH | VOL | IOH | IOL | 5 V tolerant |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| PC10 | CN7 · CN7-1 | gpio | PC10 | PC10, SPI3_SCK/I2S3_CK, USART3_TX, UART4_TX, QUADSPI_BK1_IO1, SDIO_D2, DCMI_D8, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC11 | CN7 · CN7-2 | gpio | PC11 | PC11, SPI3_MISO, USART3_RX, UART4_RX, QUADSPI_BK2_NCS, SDIO_D3, DCMI_D4, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC9 | CN10 · CN10-1 | gpio | PC9 | PC9, MCO2, TIM3_CH4, TIM8_CH4, I2C3_SDA, I2S_CKIN, UART5_CTS, QUADSPI_BK1_IO0, SDIO_D1, DCMI_D3, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC8 | CN10 · CN10-2 | gpio | PC8 | PC8, TRACED0, TIM3_CH3, TIM8_CH3, UART5_RTS, USART6_CK, SDIO_D0, DCMI_D2, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC12 | CN7 · CN7-3 | gpio | PC12 | PC12, I2C2_SDA, SPI3_MOSI/I2S3_SD, USART3_CK, UART5_TX, SDIO_CK, DCMI_D9, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PD2 | CN7 · CN7-4 | gpio | PD2 | PD2, TIM3_ETR, UART5_RX, SDIO_CMD, DCMI_D11, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB8 | CN10 · CN10-3 | gpio | PB8 | PB8, TIM2_CH1/TIM2_ETR, TIM4_CH3, TIM10_CH1, I2C1_SCL, CAN1_RX, SDIO_D4, DCMI_D6, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC6 | CN10 · CN10-4 | gpio | PC6 | PC6, TIM3_CH1, TIM8_CH1, FMPI2C1_SCL, I2S2_MCK, USART6_TX, SDIO_D6, DCMI_D0, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| VDD | CN7 · CN7-5 | power out | — | power_out | — | — | — | — | — | — | — |
| E5V | CN7 · CN7-6 | power in | — | power_in | — | — | — | — | — | — | — |
| PB9 | CN10 · CN10-5 | gpio | PB9 | PB9, TIM2_CH2, TIM4_CH4, TIM11_CH1, I2C1_SDA, SPI2_NSS/I2S2_WS, SAI1_FS_B, CAN1_TX, SDIO_D5, DCMI_D7, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC5 | CN10 · CN10-6 | gpio | PC5 | PC5, USART3_RX, SPDIFRX_IN3, FMC_SDCKE0, EVENTOUT, ADC12_IN15 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| BOOT0 | CN7 · CN7-7 | control | BOOT0 | VPP, BOOT0 (boot mode select) | — | — | — | — | — | — | — |
| GND | CN7 · CN7-8 | ground | — | ground | — | — | — | — | — | — | — |
| AVDD | CN10 · CN10-7 | power out | — | power_out | — | — | — | — | — | — | — |
| U5V | CN10 · CN10-8 | power out | — | power_out | — | — | — | — | — | — | — |
| - | CN7 · CN7-9 | nc | — | no_connect | — | — | — | — | — | — | — |
| - | CN7 · CN7-10 | nc | — | no_connect | — | — | — | — | — | — | — |
| GND | CN10 · CN10-9 | ground | — | ground | — | — | — | — | — | — | — |
| - | CN10 · CN10-10 | nc | — | no_connect | — | — | — | — | — | — | — |
| - | CN7 · CN7-11 | nc | — | no_connect | — | — | — | — | — | — | — |
| IOREF | CN7 · CN7-12 | power out | — | power_out | — | — | — | — | — | — | — |
| PA5 | CN10 · CN10-11 | gpio | PA5 | PA5, LD2 user LED (green), TIM2_CH1/TIM2_ETR, TIM8_CH1N, SPI1_SCK/I2S1_CK, OTG_HS_ULPI_CK, EVENTOUT, ADC12_IN5, DAC_OUT2 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | no |
| PA12 | CN10 · CN10-12 | gpio | PA12 | PA12, TIM1_ETR, USART1_RTS, SAI2_FS_B, CAN1_TX, OTG_FS_DP, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA13 | CN7 · CN7-13 | gpio | PA13 | PA13, SWD to on-board ST-LINK/V2-1, JTMS-SWDIO, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| NRST | CN7 · CN7-14 | control | NRST | RESET (B2 button, ST-LINK), NRST (reset, weak pull-up) | — | — | — | — | — | — | — |
| PA6 | CN10 · CN10-13 | gpio | PA6 | PA6, TIM1_BKIN, TIM3_CH1, TIM8_BKIN, SPI1_MISO, I2S2_MCK, TIM13_CH1, DCMI_PIXCLK, EVENTOUT, ADC12_IN6 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA11 | CN10 · CN10-14 | gpio | PA11 | PA11, TIM1_CH4, USART1_CTS, CAN1_RX, OTG_FS_DM, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA14 | CN7 · CN7-15 | gpio | PA14 | PA14, SWD to on-board ST-LINK/V2-1, JTCK-SWCLK, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| +3.3V | CN7 · CN7-16 | power out | — | power_out | — | — | — | — | — | — | — |
| PA7 | CN10 · CN10-15 | gpio | PA7 | PA7, TIM1_CH1N, TIM3_CH2, TIM8_CH1N, SPI1_MOSI/I2S1_SD, TIM14_CH1, FMC_SDNWE, EVENTOUT, ADC12_IN7 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB12 | CN10 · CN10-16 | gpio | PB12 | PB12, TIM1_BKIN, I2C2_SMBA, SPI2_NSS/I2S2_WS, SAI1_SCK_B, USART3_CK, CAN2_RX, OTG_HS_ULPI_D5, OTG_HS_ID, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA15 | CN7 · CN7-17 | gpio | PA15 | PA15, JTDI, TIM2_CH1/TIM2_ETR, HDMI_CEC, SPI1_NSS/I2S1_WS, SPI3_NSS/I2S3_WS, UART4_RTS, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| +5V | CN7 · CN7-18 | power out | — | power_out | — | — | — | — | — | — | — |
| PB6 | CN10 · CN10-17 | gpio | PB6 | PB6, TIM4_CH1, HDMI_CEC, I2C1_SCL, USART1_TX, CAN2_TX, QUADSPI_BK1_NCS, FMC_SDNE1, DCMI_D5, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| - | CN10 · CN10-18 | nc | — | no_connect | — | — | — | — | — | — | — |
| GND | CN7 · CN7-19 | ground | — | ground | — | — | — | — | — | — | — |
| GND | CN7 · CN7-20 | ground | — | ground | — | — | — | — | — | — | — |
| PC7 | CN10 · CN10-19 | gpio | PC7 | PC7, TIM3_CH2, TIM8_CH2, FMPI2C1_SDA, SPI2_SCK/I2S2_CK, I2S3_MCK, SPDIFRX_IN1, USART6_RX, SDIO_D7, DCMI_D1, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| GND | CN10 · CN10-20 | ground | — | ground | — | — | — | — | — | — | — |
| PB7 | CN7 · CN7-21 | gpio | PB7 | PB7, TIM4_CH2, I2C1_SDA, USART1_RX, SPDIFRX_IN0, FMC_NL, DCMI_VSYNC, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| GND | CN7 · CN7-22 | ground | — | ground | — | — | — | — | — | — | — |
| PA9 | CN10 · CN10-21 | gpio | PA9 | PA9, TIM1_CH2, I2C3_SMBA, SPI2_SCK/I2S2_CK, SAI1_SD_B, USART1_TX, DCMI_D0, EVENTOUT, OTG_FS_VBUS | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB2 | CN10 · CN10-22 | gpio | PB2 | PB2, TIM2_CH4, SAI1_SD_A, SPI3_MOSI/I2S3_SD, QUADSPI_CLK, OTG_HS_ULPI_D4, SDIO_CK, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC13 | CN7 · CN7-23 | gpio | PC13 | PC13, B1 USER button, EVENTOUT, TAMP_1/WKUP1 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| VIN | CN7 · CN7-24 | power in | — | power_in | — | — | — | — | — | — | — |
| PA8 | CN10 · CN10-23 | gpio | PA8 | PA8, MCO1, TIM1_CH1, I2C3_SCL, USART1_CK, OTG_FS_SOF, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB1 | CN10 · CN10-24 | gpio | PB1 | PB1, TIM1_CH3N, TIM3_CH4, TIM8_CH3N, OTG_HS_ULPI_D2, SDIO_D2, EVENTOUT, ADC12_IN9 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC14 | CN7 · CN7-25 | gpio | PC14 | PC14, EVENTOUT, OSC32_IN | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| - | CN7 · CN7-26 | nc | — | no_connect | — | — | — | — | — | — | — |
| PB10 | CN10 · CN10-25 | gpio | PB10 | PB10, TIM2_CH3, I2C2_SCL, SPI2_SCK/I2S2_CK, SAI1_SCK_A, USART3_TX, OTG_HS_ULPI_D3, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB15 | CN10 · CN10-26 | gpio | PB15 | PB15, RTC_REFIN, TIM1_CH3N, TIM8_CH3N, SPI2_MOSI/I2S2_SD, TIM12_CH2, OTG_HS_DP, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC15 | CN7 · CN7-27 | gpio | PC15 | PC15, EVENTOUT, OSC32_OUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA0 | CN7 · CN7-28 | gpio | PA0 | PA0, TIM2_CH1/TIM2_ETR, TIM5_CH1, TIM8_ETR, USART2_CTS, UART4_TX, EVENTOUT, ADC123_IN0, WKUP0/TAMP_2 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB4 | CN10 · CN10-27 | gpio | PB4 | PB4, NJTRST, TIM3_CH1, I2C3_SDA, SPI1_MISO, SPI3_MISO, SPI2_NSS/I2S2_WS, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB14 | CN10 · CN10-28 | gpio | PB14 | PB14, TIM1_CH2N, TIM8_CH2N, SPI2_MISO, USART3_RTS, TIM12_CH1, OTG_HS_DM, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PH0 | CN7 · CN7-29 | gpio | PH0 | PH0, EVENTOUT, OSC_IN | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA1 | CN7 · CN7-30 | gpio | PA1 | PA1, TIM2_CH2, TIM5_CH2, USART2_RTS, UART4_RX, QUADSPI_BK1_IO3, SAI2_MCLK_B, EVENTOUT, ADC123_IN1 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB5 | CN10 · CN10-29 | gpio | PB5 | PB5, TIM3_CH2, I2C1_SMBA, SPI1_MOSI/I2S1_SD, SPI3_MOSI/I2S3_SD, CAN2_RX, OTG_HS_ULPI_D7, FMC_SDCKE1, DCMI_D10, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB13 | CN10 · CN10-30 | gpio | PB13 | PB13, TIM1_CH1N, SPI2_SCK/I2S2_CK, USART3_CTS, CAN2_TX, OTG_HS_ULPI_D6, EVENTOUT, OTG_HS_VBUS | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PH1 | CN7 · CN7-31 | gpio | PH1 | PH1, EVENTOUT, OSC_OUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA4 | CN7 · CN7-32 | gpio | PA4 | PA4, SPI1_NSS/I2S1_WS, SPI3_NSS/I2S3_WS, USART2_CK, OTG_HS_SOF, DCMI_HSYNC, EVENTOUT, ADC12_IN4, DAC_OUT1 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | no |
| PB3 | CN10 · CN10-31 | gpio | PB3 | PB3, JTDO/TRACESWO, TIM2_CH2, I2C2_SDA, SPI1_SCK/I2S1_CK, SPI3_SCK/I2S3_CK, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| AGND | CN10 · CN10-32 | ground | — | ground | — | — | — | — | — | — | — |
| VBAT | CN7 · CN7-33 | power in | VBAT | power_in | — | — | — | — | — | — | — |
| PB0 | CN7 · CN7-34 | gpio | PB0 | PB0, TIM1_CH2N, TIM3_CH3, TIM8_CH2N, SPI3_MOSI/I2S3_SD, UART4_CTS, OTG_HS_ULPI_D1, SDIO_D1, EVENTOUT, ADC12_IN8 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA10 | CN10 · CN10-33 | gpio | PA10 | PA10, TIM1_CH3, USART1_RX, OTG_FS_ID, DCMI_D1, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC4 | CN10 · CN10-34 | gpio | PC4 | PC4, I2S1_MCK, SPDIFRX_IN2, FMC_SDNE0, EVENTOUT, ADC12_IN14 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC2 | CN7 · CN7-35 | gpio | PC2 | PC2, SPI2_MISO, OTG_HS_ULPI_DIR, FMC_SDNE0, EVENTOUT, ADC123_IN12 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC1 | CN7 · CN7-36 | gpio | PC1 | PC1, SPI3_MOSI/I2S3_SD, SAI1_SD_A, SPI2_MOSI/I2S2_SD, EVENTOUT, ADC123_IN11 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA2 | CN10 · CN10-35 | gpio | PA2 | PA2, ST-LINK VCP USART2_TX (default), TIM2_CH3, TIM5_CH3, TIM9_CH1, USART2_TX, SAI2_SCK_B, EVENTOUT, ADC123_IN2 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| - | CN10 · CN10-36 | nc | — | no_connect | — | — | — | — | — | — | — |
| PC3 | CN7 · CN7-37 | gpio | PC3 | PC3, SPI2_MOSI/I2S2_SD, OTG_HS_ULPI_NXT, FMC_SDCKE0, EVENTOUT, ADC123_IN13 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC0 | CN7 · CN7-38 | gpio | PC0 | PC0, SAI1_MCLK_B, OTG_HS_ULPI_STP, FMC_SDNWE, EVENTOUT, ADC123_IN10 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA3 | CN10 · CN10-37 | gpio | PA3 | PA3, ST-LINK VCP USART2_RX (default), TIM2_CH4, TIM5_CH4, TIM9_CH2, SAI1_FS_A, USART2_RX, OTG_HS_ULPI_D0, EVENTOUT, ADC123_IN3 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| - | CN10 · CN10-38 | nc | — | no_connect | — | — | — | — | — | — | — |
| NC | CN6 · CN6-1 | nc | — | no_connect | — | — | — | — | — | — | — |
| IOREF | CN6 · CN6-2 | power out | — | power_out | — | — | — | — | — | — | — |
| NRST | CN6 · CN6-3 | control | NRST | RESET, RESET (B2 button, ST-LINK), NRST (reset, weak pull-up) | — | — | — | — | — | — | — |
| +3.3V | CN6 · CN6-4 | power out | — | power_out | — | — | — | — | — | — | — |
| +5V | CN6 · CN6-5 | power out | — | power_out | — | — | — | — | — | — | — |
| GND | CN6 · CN6-6 | ground | — | ground | — | — | — | — | — | — | — |
| GND | CN6 · CN6-7 | ground | — | ground | — | — | — | — | — | — | — |
| VIN | CN6 · CN6-8 | power in | — | power_in | — | — | — | — | — | — | — |
| PA0 | CN8 · CN8-1 | gpio | PA0 | PA0, A0, ADC123_IN0, TIM2_CH1/TIM2_ETR, TIM5_CH1, TIM8_ETR, USART2_CTS, UART4_TX, EVENTOUT, WKUP0/TAMP_2 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA1 | CN8 · CN8-2 | gpio | PA1 | PA1, A1, ADC123_IN1, TIM2_CH2, TIM5_CH2, USART2_RTS, UART4_RX, QUADSPI_BK1_IO3, SAI2_MCLK_B, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA4 | CN8 · CN8-3 | gpio | PA4 | PA4, A2, ADC12_IN4, SPI1_NSS/I2S1_WS, SPI3_NSS/I2S3_WS, USART2_CK, OTG_HS_SOF, DCMI_HSYNC, EVENTOUT, DAC_OUT1 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | no |
| PB0 | CN8 · CN8-4 | gpio | PB0 | PB0, A3, ADC12_IN8, TIM1_CH2N, TIM3_CH3, TIM8_CH2N, SPI3_MOSI/I2S3_SD, UART4_CTS, OTG_HS_ULPI_D1, SDIO_D1, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC1 | CN8 · CN8-5 | gpio | PC1 | PC1, A4, ADC123_IN11 (PC1) or I2C1_SDA (PB9), SPI3_MOSI/I2S3_SD, SAI1_SD_A, SPI2_MOSI/I2S2_SD, EVENTOUT, ADC123_IN11 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC0 | CN8 · CN8-6 | gpio | PC0 | PC0, A5, ADC123_IN10 (PC0) or I2C1_SCL (PB8), SAI1_MCLK_B, OTG_HS_ULPI_STP, FMC_SDNWE, EVENTOUT, ADC123_IN10 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB8 | CN5 · CN5-10 | gpio | PB8 | PB8, D15, I2C1_SCL, TIM2_CH1/TIM2_ETR, TIM4_CH3, TIM10_CH1, CAN1_RX, SDIO_D4, DCMI_D6, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB9 | CN5 · CN5-9 | gpio | PB9 | PB9, D14, I2C1_SDA, TIM2_CH2, TIM4_CH4, TIM11_CH1, SPI2_NSS/I2S2_WS, SAI1_FS_B, CAN1_TX, SDIO_D5, DCMI_D7, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| AREF | CN5 · CN5-8 | power out | — | power_out | — | — | — | — | — | — | — |
| GND | CN5 · CN5-7 | ground | — | ground | — | — | — | — | — | — | — |
| PA5 | CN5 · CN5-6 | gpio | PA5 | PA5, D13, SPI1_SCK, LD2 user LED (green), TIM2_CH1/TIM2_ETR, TIM8_CH1N, SPI1_SCK/I2S1_CK, OTG_HS_ULPI_CK, EVENTOUT, ADC12_IN5, DAC_OUT2 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | no |
| PA6 | CN5 · CN5-5 | gpio | PA6 | PA6, D12, SPI1_MISO, TIM1_BKIN, TIM3_CH1, TIM8_BKIN, I2S2_MCK, TIM13_CH1, DCMI_PIXCLK, EVENTOUT, ADC12_IN6 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA7 | CN5 · CN5-4 | gpio | PA7 | PA7, D11, TIM14_CH1 \, TIM1_CH1N, TIM3_CH2, TIM8_CH1N, SPI1_MOSI/I2S1_SD, TIM14_CH1, FMC_SDNWE, EVENTOUT, ADC12_IN7 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB6 | CN5 · CN5-3 | gpio | PB6 | PB6, D10, TIM4_CH1 \, TIM4_CH1, HDMI_CEC, I2C1_SCL, USART1_TX, CAN2_TX, QUADSPI_BK1_NCS, FMC_SDNE1, DCMI_D5, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PC7 | CN5 · CN5-2 | gpio | PC7 | PC7, D9, TIM8_CH2, TIM3_CH2, FMPI2C1_SDA, SPI2_SCK/I2S2_CK, I2S3_MCK, SPDIFRX_IN1, USART6_RX, SDIO_D7, DCMI_D1, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA9 | CN5 · CN5-1 | gpio | PA9 | PA9, D8, TIM1_CH2, I2C3_SMBA, SPI2_SCK/I2S2_CK, SAI1_SD_B, USART1_TX, DCMI_D0, EVENTOUT, OTG_FS_VBUS | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA8 | CN9 · CN9-8 | gpio | PA8 | PA8, D7, MCO1, TIM1_CH1, I2C3_SCL, USART1_CK, OTG_FS_SOF, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB10 | CN9 · CN9-7 | gpio | PB10 | PB10, D6, TIM2_CH3, I2C2_SCL, SPI2_SCK/I2S2_CK, SAI1_SCK_A, USART3_TX, OTG_HS_ULPI_D3, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB4 | CN9 · CN9-6 | gpio | PB4 | PB4, D5, TIM3_CH1, NJTRST, I2C3_SDA, SPI1_MISO, SPI3_MISO, SPI2_NSS/I2S2_WS, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB5 | CN9 · CN9-5 | gpio | PB5 | PB5, D4, TIM3_CH2, I2C1_SMBA, SPI1_MOSI/I2S1_SD, SPI3_MOSI/I2S3_SD, CAN2_RX, OTG_HS_ULPI_D7, FMC_SDCKE1, DCMI_D10, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PB3 | CN9 · CN9-4 | gpio | PB3 | PB3, D3, TIM2_CH2, JTDO/TRACESWO, I2C2_SDA, SPI1_SCK/I2S1_CK, SPI3_SCK/I2S3_CK, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA10 | CN9 · CN9-3 | gpio | PA10 | PA10, D2, TIM1_CH3, USART1_RX, OTG_FS_ID, DCMI_D1, EVENTOUT | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA2 | CN9 · CN9-2 | gpio | PA2 | PA2, D1, USART2_TX, ST-LINK VCP USART2_TX (default), TIM2_CH3, TIM5_CH3, TIM9_CH1, SAI2_SCK_B, EVENTOUT, ADC123_IN2 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| PA3 | CN9 · CN9-1 | gpio | PA3 | PA3, D0, USART2_RX, ST-LINK VCP USART2_RX (default), TIM2_CH4, TIM5_CH4, TIM9_CH2, SAI1_FS_A, OTG_HS_ULPI_D0, EVENTOUT, ADC123_IN3 | ≥ 2.31 V | ≤ 0.99 V | ≥ 2.9 V | ≤ 0.4 V | ≤ 25 mA | ≤ 25 mA | yes |
| VDD_TARGET | CN4 · CN4-1 | power in | — | power_in | — | — | — | — | — | — | — |
| SWCLK | CN4 · CN4-2 | debug | PA14 | ST-LINK SWCLK (SWD clock) | — | — | — | — | — | — | — |
| GND | CN4 · CN4-3 | ground | — | ground | — | — | — | — | — | — | — |
| SWDIO | CN4 · CN4-4 | debug | PA13 | ST-LINK SWDIO (SWD data input/output) | — | — | — | — | — | — | — |
| NRST | CN4 · CN4-5 | control | NRST | ST-LINK NRST (RESET of target STM32), NRST (reset, weak pull-up) | — | — | — | — | — | — | — |
| SWO | CN4 · CN4-6 | debug | — | ST-LINK SWO (Reserved) | — | — | — | — | — | — | — |

## Where to buy

| Supplier | Price | Stock | Checked | URL |
| --- | --- | --- | --- | --- |
| estore.st.com | 18.66 USD | in_stock | 2026-09-24 | https://estore.st.com/en/nucleo-f446re-cpn.html |

## FAQ

**What microcontroller does the STM32 Nucleo-64 NUCLEO-F446RE (MB1136) use?**

The STM32 Nucleo-64 NUCLEO-F446RE (MB1136) is built around the STM32F446RET6, alongside STM32F103CBT6 (ST-LINK/V2-1), LD39050PU33R, ABS25-32.768KHZ-6-T (MB1136 C-03+).

**How many GPIO pins does the STM32 Nucleo-64 NUCLEO-F446RE (MB1136) have?**

50 GPIO pins are exposed. Xirkit documents 114 board pins, 72 of them with pin-level electrical limits.

**Are the STM32 Nucleo-64 NUCLEO-F446RE (MB1136) I/O pins 5 V tolerant?**

68 pins are 5 V tolerant and 4 are not — check each pin in the pinout table before connecting 5 V signals.

**How much current can a STM32 Nucleo-64 NUCLEO-F446RE (MB1136) GPIO pin source?**

Documented output-high current per pin: ≤ 25 mA. Values are traced to the chip datasheet; see the pinout table for per-pin limits and conditions.

**What voltage powers the STM32 Nucleo-64 NUCLEO-F446RE (MB1136)?**

Supply range 1.65–12 V. Power inputs: E5V (4.75–5.25 V), VIN (7–12 V), VBAT (1.65–3.6 V), VIN (7–12 V), VDD_TARGET.

**How much does the STM32 Nucleo-64 NUCLEO-F446RE (MB1136) cost?**

From $18.66 at estore.st.com. Prices are observed unit prices before tax and shipping.

**What are the STM32 Nucleo-64 NUCLEO-F446RE (MB1136) dimensions?**

70 × 82.5 mm. A STEP model is available for enclosure fit checks.

**Which interfaces does the STM32 Nucleo-64 NUCLEO-F446RE (MB1136) support?**

gpio, spi, uart, qspi, sdio, camera, event, clock, timer, i2c, i2s, debug, can, audio, memory, adc, control, led, usb, dac, cec, button, rtc, wakeup, arduino, pwm.

**How do I program the STM32 Nucleo-64 NUCLEO-F446RE (MB1136)?**

Supported frameworks: STM32Cube, Arm Mbed, Arduino (STM32duino).

**Where does this STM32 Nucleo-64 NUCLEO-F446RE (MB1136) data come from?**

Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.

## Sources

- [STM32 Nucleo-64 NUCLEO-F446RE (MB1136) datasheet](https://www.st.com/resource/en/user_manual/um1724-stm32-nucleo64-boards-mb1136-stmicroelectronics.pdf)
- [estore.st.com listing](https://estore.st.com/en/nucleo-f446re-cpn.html)

## Part graph

### Built from

- [STM32F446RET6](https://www.xirkit.io/products/category/dev-boards/stm32f446ret6) — main processor on the STM32 Nucleo-64 NUCLEO-F446RE (MB1136)
- STM32F103CBT6 (ST-LINK/V2-1) — debugger on the STM32 Nucleo-64 NUCLEO-F446RE (MB1136)
- LD39050PU33R — ldo regulator on the STM32 Nucleo-64 NUCLEO-F446RE (MB1136)
- ABS25-32.768KHZ-6-T (MB1136 C-03+) — crystal on the STM32 Nucleo-64 NUCLEO-F446RE (MB1136)

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