STM32F334C8T6 from STMicroelectronics, in a LQFP-48(7x7). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	VBAT	power_in	Backup power supply for RTC and backup registers. Typically tied to VDD or a coin-cell battery (1.65-3.6 V).
2	PC13	bidirectional	GPIO PC13 (TC 3.3 V I/O). Supplied through the backup power switch (max 3 mA sink); additional functions RTC_TAMP1/RTC_TS/RTC_OUT/WKUP2 and TIM1_CH1N alt.
3	PC14/OSC32_IN	bidirectional	GPIO PC14 or LSE 32.768 kHz crystal input (OSC32_IN). Reset default is GPIO; enabled as OSC32_IN via RCC/RTC config.
4	PC15/OSC32_OUT	bidirectional	GPIO PC15 or LSE 32.768 kHz crystal output (OSC32_OUT). Reset default GPIO; enabled as OSC32_OUT via RCC/RTC config.
5	PF0/OSC_IN	bidirectional	GPIO PF0 or HSE crystal/clock input (OSC_IN). Alt function TIM1_CH3N.
6	PF1/OSC_OUT	bidirectional	GPIO PF1 or HSE crystal output (OSC_OUT).
7	NRST	bidirectional	Bidirectional device reset input / internal reset output, active low. Includes weak internal pull-up (~40 kΩ).
8	VSSA/VREF-	power_in	Analog ground and negative ADC/DAC reference (LQFP48 combines VSSA and VREF-).
9	VDDA/VREF+	power_in	Analog power supply and positive ADC/DAC reference (2.0-3.6 V; 2.4-3.6 V for DAC/op-amp). LQFP48 combines VDDA and VREF+.
10	PA0	bidirectional	PA0 GPIO, TTa 3.3 V ADC-connected I/O. Alt: TIM2_CH1/TIM2_ETR, TSC_G1_IO1, USART2_CTS, EVENTOUT. Additional: ADC1_IN1 (fast), RTC_TAMP2/WKUP1.
11	PA1	bidirectional	PA1 GPIO, TTa. Alt: TIM2_CH2, TSC_G1_IO2, USART2_RTS_DE, TIM15_CH1N, EVENTOUT. Additional: ADC1_IN2 (fast), RTC_REFIN.
12	PA2	bidirectional	PA2 GPIO, TTa. Alt: TIM2_CH3, TSC_G1_IO3, USART2_TX, COMP2_OUT, TIM15_CH1, EVENTOUT. Additional: ADC1_IN3 (fast), COMP2_INM.
13	PA3	bidirectional	PA3 GPIO, TTa. Alt: TIM2_CH4, TSC_G1_IO4, USART2_RX, TIM15_CH2, EVENTOUT. Additional: ADC1_IN4 (fast).
14	PA4	bidirectional	PA4 GPIO, TTa. Alt: TIM3_CH2, TSC_G2_IO1, SPI1_NSS, USART2_CK, EVENTOUT. Additional: ADC2_IN1 (fast), DAC1_OUT1, COMP2/4/6_INM.
15	PA5	bidirectional	PA5 GPIO, TTa. Alt: TIM2_CH1/ETR, TSC_G2_IO2, SPI1_SCK, EVENTOUT. Additional: ADC2_IN2 (fast), DAC1_OUT2, OPAMP2_VINM.
16	PA6	bidirectional	PA6 GPIO, TTa. Alt: TIM16_CH1, TIM3_CH1, TSC_G2_IO3, SPI1_MISO, TIM1_BKIN, OPAMP2_DIG, EVENTOUT. Additional: ADC2_IN3 (fast), DAC2_OUT1, OPAMP2_VOUT.
17	PA7	bidirectional	PA7 GPIO, TTa. Alt: TIM17_CH1, TIM3_CH2, TSC_G2_IO4, SPI1_MOSI, TIM1_CH1N, EVENTOUT. Additional: ADC2_IN4 (fast), COMP2_INP, OPAMP2_VINP.
18	PB0	bidirectional	PB0 GPIO, TTa. Alt: TIM3_CH3, TSC_G3_IO2, TIM1_CH2N, EVENTOUT. Additional: ADC1_IN11, COMP4_INP, OPAMP2_VINP.
19	PB1	bidirectional	PB1 GPIO, TTa. Alt: TIM3_CH4, TSC_G3_IO3, TIM1_CH3N, COMP4_OUT, HRTIM1_SCOUT, EVENTOUT. Additional: ADC1_IN12.
20	PB2	bidirectional	PB2 GPIO, TTa. Alt: TSC_G3_IO4, HRTIM_SCIN, EVENTOUT. Additional: ADC2_IN12, COMP4_INM.
21	PB10	bidirectional	PB10 GPIO, TT 3.3 V I/O. Alt: TIM2_CH3, TSC_SYNC, USART3_TX, HRTIM1_FLT3, EVENTOUT.
22	PB11	bidirectional	PB11 GPIO, TTa. Alt: TIM2_CH4, TSC_G6_IO1, USART3_RX, HRTIM1_FLT4, EVENTOUT. Additional: COMP6_INP.
23	VSS	power_in	Digital ground.
24	VDD	power_in	Digital power supply, 2.0-3.6 V.
25	PB12	bidirectional	PB12 GPIO, TTa. Alt: TSC_G6_IO2, TIM1_BKIN, USART3_CK, HRTIM1_CHC1, EVENTOUT. Additional: ADC2_IN13.
26	PB13	bidirectional	PB13 GPIO, TTa. Alt: TSC_G6_IO3, TIM1_CH1N, USART3_CTS, HRTIM1_CHC2, EVENTOUT. Additional: ADC1_IN13.
27	PB14	bidirectional	PB14 GPIO, TTa. Alt: TIM15_CH1, TSC_G6_IO4, TIM1_CH2N, USART3_RTS_DE, HRTIM1_CHD1, EVENTOUT. Additional: ADC2_IN14, OPAMP2_VINP.
28	PB15	bidirectional	PB15 GPIO, TTa. Alt: TIM15_CH2/CH1N, TIM1_CH3N, HRTIM1_CHD2, EVENTOUT. Additional: ADC2_IN15, COMP6_INM, RTC_REFIN.
29	PA8	bidirectional	PA8 GPIO, FT 5 V-tolerant. Alt: MCO, TIM1_CH1, USART1_CK, HRTIM1_CHA1, EVENTOUT.
30	PA9	bidirectional	PA9 GPIO, FT 5 V-tolerant. Alt: TSC_G4_IO1, TIM1_CH2, USART1_TX, TIM15_BKIN, TIM2_CH3, HRTIM1_CHA2, EVENTOUT.
31	PA10	bidirectional	PA10 GPIO, FT 5 V-tolerant. Alt: TIM17_BKIN, TSC_G4_IO2, TIM1_CH3, USART1_RX, COMP6_OUT, TIM2_CH4, HRTIM1_CHB1, EVENTOUT.
32	PA11	bidirectional	PA11 GPIO, FT 5 V-tolerant. Alt: TIM1_CH1N, USART1_CTS, CAN_RX, TIM1_CH4, TIM1_BKIN2, HRTIM1_CHB2, EVENTOUT.
33	PA12	bidirectional	PA12 GPIO, FT 5 V-tolerant. Alt: TIM16_CH1, TIM1_CH2N, USART1_RTS_DE, COMP2_OUT, CAN_TX, TIM1_ETR, HRTIM1_FLT1, EVENTOUT.
34	PA13	bidirectional	PA13 GPIO / SWDIO. FT 5 V-tolerant. Reset default JTMS/SWDAT. Alt: TIM16_CH1N, TSC_G4_IO3, IR_OUT, USART3_CTS, EVENTOUT.
35	VSS	power_in	Digital ground.
36	VDD	power_in	Digital power supply, 2.0-3.6 V.
37	PA14	bidirectional	PA14 GPIO / SWCLK. FTf 5 V-tolerant with I2C Fast-mode+ capability. Reset default JTCK/SWCLK. Alt: TSC_G4_IO4, I2C1_SDA, TIM1_BKIN, USART2_TX, EVENTOUT.
38	PA15	bidirectional	PA15 GPIO, FTf 5 V-tolerant FM+ capable. Reset default JTDI. Alt: TIM2_CH1/ETR, TSC_SYNC, I2C1_SCL, SPI1_NSS, USART2_RX, TIM1_BKIN, HRTIM1_FLT2, EVENTOUT.
39	PB3	bidirectional	PB3 GPIO, FT 5 V-tolerant. Reset default JTDO/TRACESWO. Alt: TIM2_CH2, TSC_G5_IO1, SPI1_SCK, USART2_TX, TIM3_ETR, HRTIM1_SCOUT, HRTIM1_EEV9, EVENTOUT.
40	PB4	bidirectional	PB4 GPIO, FT 5 V-tolerant. Reset default NJTRST. Alt: TIM16_CH1, TIM3_CH1, TSC_G5_IO2, SPI1_MISO, USART2_RX, TIM17_BKIN, HRTIM1_EEV7, EVENTOUT.
41	PB5	bidirectional	PB5 GPIO, FT 5 V-tolerant. Alt: TIM16_BKIN, TIM3_CH2, I2C1_SMBA, SPI1_MOSI, USART2_CK, TIM17_CH1, HRTIM1_EEV6, EVENTOUT.
42	PB6	bidirectional	PB6 GPIO, FTf 5 V-tolerant FM+ capable. Alt: TIM16_CH1N, TSC_G5_IO3, I2C1_SCL, USART1_TX, HRTIM1_SCIN, HRTIM1_EEV4, EVENTOUT.
43	PB7	bidirectional	PB7 GPIO, FTf 5 V-tolerant FM+ capable. Alt: TIM17_CH1N, TSC_G5_IO4, I2C1_SDA, USART1_RX, TIM3_CH4, HRTIM1_EEV3, EVENTOUT.
44	BOOT0	input	Dedicated BOOT0 pin. Selects boot memory at reset: 0 = main Flash, 1 = system memory or embedded SRAM (per BOOT1 bit).
45	PB8	bidirectional	PB8 GPIO, FTf 5 V-tolerant FM+ capable. Alt: TIM16_CH1, TSC_SYNC, I2C1_SCL, USART3_RX, CAN_RX, TIM1_BKIN, HRTIM1_EEV8, EVENTOUT.
46	PB9	bidirectional	PB9 GPIO, FTf 5 V-tolerant FM+ capable. Alt: TIM17_CH1, I2C1_SDA, IR_OUT, USART3_TX, COMP2_OUT, CAN_TX, HRTIM1_EEV5, EVENTOUT.
47	VSS	power_in	Digital ground.
48	VDD	power_in	Digital power supply, 2.0-3.6 V.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	LQFP-48(7x7)
Category	MCU
Pins	48

Ordering variants

Same part, different packaging or reel option.

STM32F334C8T6K4T6
STM32F334C8T6K6T6
STM32F334C8T6K8T6
STM32F334C8T6C4T6
STM32F334C8T6C6T6
STM32F334C8T6
STM32F334C8T6R6T6
STM32F334C8T6R8T6
STM32F334C8T6C6Y6TR
STM32F334C8T6C8Y6TR

CAD (KiCad official)

Symbol: STM32F334C8T6
Footprint: Package_QFP:LQFP-48_7x7mm_P0.5mm
3D model: LQFP-48(7x7) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`stm32f334c8t6.step`	617 KB	You want the bare part, or you mark your own boards.
`stm32f334c8t6-etched.step`	4.9 MB	You want the part with `STM32F334C8T6` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 1222 faces against 747 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: STMicroelectronics datasheet (121 pp, sha256 9718bda0be93fc93, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF