# STM32F303C8T6

**STMicroelectronics** · Microcontrollers (MCU/MPU/SOC) · LQFP-48(7x7)

STM32F303C8T6 from STMicroelectronics, in a LQFP-48(7x7). 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 | VBAT | power_in | Backup power supply for RTC, backup registers and wakeup logic, 1.65 to 3.6 V |
| 2 | PC13 | bidirectional | General-purpose I/O with RTC backup domain interface, alternate functions TIM1_CH1N and RTC features |
| 3 | PC14/OSC32_IN | bidirectional | 32 kHz oscillator input for RTC, alternate function OSC32_IN |
| 4 | PC15/OSC32_OUT | bidirectional | 32 kHz oscillator output for RTC, alternate function OSC32_OUT |
| 5 | PF0/OSC_IN | bidirectional | 5V-tolerant I/O with high-speed external oscillator input, alternate functions TIM1_CH3N and OSC_IN |
| 6 | PF1/OSC_OUT | bidirectional | 5V-tolerant I/O with high-speed external oscillator output capability, alternate function OSC_OUT |
| 7 | NRST | bidirectional | Device reset input with embedded weak pull-up resistor, active low for internal and external reset |
| 8 | VSSA/VREF- | power_in | Analog ground and negative reference voltage for ADC and comparators |
| 9 | VDDA/VREF+ | power_in | Analog power supply and positive reference voltage for ADC, DAC, and comparators, 2.0 to 3.6 V |
| 10 | PA0 | bidirectional | 3.3V-tolerant analog I/O with ADC1_IN1 input, timer, touch sensing and USART features |
| 11 | PA1 | bidirectional | 3.3V-tolerant analog I/O with ADC1_IN2 input, timer and USART features, RTC reference input |
| 12 | PA2 | bidirectional | 3.3V-tolerant analog I/O with ADC1_IN3 input, timer, comparator and USART functions |
| 13 | PA3 | bidirectional | 3.3V-tolerant analog I/O with ADC1_IN4 input, timer and USART receive capability |
| 14 | PA4 | bidirectional | 3.3V-tolerant analog I/O with ADC2_IN1 and DAC1_OUT1, SPI and touch sensing functions |
| 15 | PA5 | bidirectional | 3.3V-tolerant analog I/O with ADC2_IN2 and DAC1_OUT2, SPI and operational amplifier input |
| 16 | PA6 | bidirectional | 3.3V-tolerant analog I/O with ADC2_IN3 and DAC2_OUT1, SPI, timer and operational amplifier output |
| 17 | PA7 | bidirectional | 3.3V-tolerant analog I/O with ADC2_IN4 and operational amplifier input, SPI and timer functions |
| 18 | PB0 | bidirectional | 3.3V-tolerant analog I/O with ADC1_IN11, comparator and operational amplifier inputs, timer functions |
| 19 | PB1 | bidirectional | 3.3V-tolerant analog I/O with ADC1_IN12, comparator output, and timer channel capabilities |
| 20 | PB2 | bidirectional | 3.3V-tolerant analog I/O with ADC2_IN12 and comparator input, touch sensing capability |
| 21 | PB10 | bidirectional | 3.3V TTL I/O with timer, touch sensing synchronization and USART transmission functions |
| 22 | PB11 | bidirectional | 3.3V-tolerant analog I/O with ADC2_IN13 and comparator input, touch sensing and USART functions |
| 23 | VSS | power_in | Digital ground reference for microcontroller power supply |
| 24 | VDD | power_in | Digital power supply, 2.0 to 3.6 V for core, SRAM and Flash memory |
| 25 | PB12 | bidirectional | 3.3V-tolerant analog I/O with ADC2_IN13, timer and USART features, touch sensing capability |
| 26 | PB13 | bidirectional | 3.3V-tolerant analog I/O with ADC1_IN13, timer and USART functions, touch sensing capability |
| 27 | PB14 | bidirectional | 3.3V-tolerant analog I/O with ADC2_IN14 and operational amplifier input, timer and USART functions |
| 28 | PB15 | bidirectional | 3.3V-tolerant analog I/O with ADC2_IN15, comparator input and RTC reference, timer capabilities |
| 29 | PA8 | bidirectional | 5V-tolerant I/O with master clock output and timer functionality for audio/event synchronization |
| 30 | PA9 | bidirectional | 5V-tolerant I/O with timer, USART transmission and touch sensing group 4 input capability |
| 31 | PA10 | bidirectional | 5V-tolerant I/O with timer, USART reception, comparator output and touch sensing capability |
| 32 | PA11 | bidirectional | 5V-tolerant I/O with CAN receive, timer and USART handshake signals for communication |
| 33 | PA12 | bidirectional | 5V-tolerant I/O with CAN transmit, timer, comparator output and USART flow control |
| 34 | PA13 | bidirectional | 5V-tolerant JTAG/SWD debug pin with infrared output, timer and USART capabilities |
| 35 | VSS | power_in | Digital ground reference for microcontroller power supply |
| 36 | VDD | power_in | Digital power supply, 2.0 to 3.6 V for core, SRAM and Flash memory |
| 37 | PA14 | bidirectional | 5V-tolerant FM+ I2C clock pin with JTAG functionality, timer and USART features |
| 38 | PA15 | bidirectional | 5V-tolerant FM+ I2C data pin with JTAG input, SPI and USART capabilities, timer support |
| 39 | PB3 | bidirectional | 5V-tolerant I/O with JTAG output, SPI clock, timer and USART transmission functions |
| 40 | PB4 | bidirectional | 5V-tolerant I/O with JTAG reset, SPI data input, timer and USART reception capability |
| 41 | PB5 | bidirectional | 5V-tolerant I/O with I2C bus alert, SPI data output, timer and USART clock functionality |
| 42 | PB6 | bidirectional | 5V-tolerant FM+ I2C clock with timer and USART transmission for communication protocols |
| 43 | PB7 | bidirectional | 5V-tolerant FM+ I2C data pin with timer channel 4 and USART reception capability |
| 44 | BOOT0 | input | Boot mode selection input, dedicated pin that determines boot source at reset |
| 45 | PB8 | bidirectional | 5V-tolerant FM+ I2C clock with CAN receive, timer and USART functions for communication |
| 46 | PB9 | bidirectional | 5V-tolerant FM+ I2C data pin with CAN transmit, infrared output and comparator capability |
| 47 | VSS | power_in | Digital ground reference for microcontroller power supply |
| 48 | VDD | power_in | Digital power supply, 2.0 to 3.6 V for core, SRAM and Flash memory |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | LQFP-48(7x7) |
| Category | Embedded Processors & Controllers |
| Pins | 48 |

## CAD (KiCad official)

- Symbol: `STM32F303C8T6`
- Footprint: `Package_QFP:LQFP-48_7x7mm_P0.5mm`
- 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
- 3D model files: `stm32f303c8t6-etched.step` / `stm32f303c8t6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm32f303c8t6.step` / `stm32f303c8t6.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/8586180208856195072) (115 pp, sha256 `dc1490452e89dccc`, retrieved 2026-09-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/stm32f303c8t6-datasheet.pdf)