# STM32L071CZT6TR

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

STM32L071CZT6TR 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 | VDD | power_in | Main positive power supply pin, 1.65 V to 3.6 V |
| 2 | PC13 | bidirectional | General-purpose I/O port C bit 13, supporting RTC tamper input 1, RTC timestamp, RTC output, and wakeup 2 |
| 3 | PC14-OSC32_IN | bidirectional | Port C bit 14 with 32.768 kHz oscillator input function capability |
| 4 | PC15-OSC32_OUT | bidirectional | Port C bit 15 with 32.768 kHz oscillator output function capability |
| 5 | PH0-OSC_IN | bidirectional | Port H bit 0 with high-speed oscillator input function capability |
| 6 | PH1-OSC_OUT | bidirectional | Port H bit 1 with high-speed oscillator output function capability |
| 7 | NRST | bidirectional | Reset input pin with embedded weak pull-up resistor, active low |
| 8 | VSSA | power_in | Analog ground pin for ADC and comparator reference |
| 9 | VDDA | power_in | Analog power supply pin for ADC and comparators, 1.65 V to 3.6 V |
| 10 | PA0 | bidirectional | General-purpose I/O port A bit 0, TTL input, supporting ADC channel 0, COMP1 negative input, RTC tamper/wakeup, TIM2 and USART functions |
| 11 | PA1 | bidirectional | General-purpose I/O port A bit 1, 5V tolerant, supporting ADC channel 1, COMP1 positive input, TIM2 and USART functions |
| 12 | PA2 | bidirectional | General-purpose I/O port A bit 2, 5V tolerant, supporting ADC channel 2, COMP2 negative input, TIM2 and USART functions |
| 13 | PA3 | bidirectional | General-purpose I/O port A bit 3, 5V tolerant, supporting ADC channel 3, COMP2 positive input, TIM2 and USART functions |
| 14 | PA4 | bidirectional | General-purpose I/O port A bit 4, standard 3.3V I/O, supporting ADC channel 4, COMP1/COMP2 negative input, SPI and TIM functions |
| 15 | PA5 | bidirectional | General-purpose I/O port A bit 5, standard 3.3V I/O, supporting ADC channel 5, COMP1/COMP2 negative input, SPI and TIM functions |
| 16 | PA6 | bidirectional | General-purpose I/O port A bit 6, 5V tolerant, supporting ADC channel 6, COMP1 output, SPI and TIM functions |
| 17 | PA7 | bidirectional | General-purpose I/O port A bit 7, 5V tolerant, supporting ADC channel 7, COMP2 output, SPI and TIM functions |
| 18 | PB0 | bidirectional | General-purpose I/O port B bit 0, 5V tolerant, supporting ADC channel 8, VREF output, TIM3 functions |
| 19 | PB1 | bidirectional | General-purpose I/O port B bit 1, 5V tolerant, supporting ADC channel 9, VREF output, TIM3 and LPUART functions |
| 20 | PB2 | bidirectional | General-purpose I/O port B bit 2, 5V tolerant, supporting LPTIM1 output and I2C3 SMBus alert functions |
| 21 | PB10 | bidirectional | General-purpose I/O port B bit 10, 5V tolerant, supporting TIM2, LPUART, SPI2 and I2C2 functions |
| 22 | PB11 | bidirectional | General-purpose I/O port B bit 11, 5V tolerant, supporting TIM2, LPUART and I2C2 functions |
| 23 | VSS | power_in | Ground pin, 0 V reference for digital circuits |
| 24 | VDD | power_in | Main positive power supply pin, 1.65 V to 3.6 V |
| 25 | PB12 | bidirectional | General-purpose I/O port B bit 12, 5V tolerant, supporting SPI2/I2S2, LPUART and I2C2 functions |
| 26 | PB13 | bidirectional | General-purpose I/O port B bit 13, 5V tolerant with FM+ capability, supporting SPI2/I2S2, MCO, LPUART and I2C2 functions |
| 27 | PB14 | bidirectional | General-purpose I/O port B bit 14, 5V tolerant with FM+ capability, supporting SPI2/I2S2, RTC, LPUART and I2C2 functions |
| 28 | PB15 | bidirectional | General-purpose I/O port B bit 15, 5V tolerant, supporting SPI2/I2S2 and RTC functions |
| 29 | PA8 | bidirectional | General-purpose I/O port A bit 8, 5V tolerant with FM+ capability, supporting MCO, USART1, I2C3 and event output functions |
| 30 | PA9 | bidirectional | General-purpose I/O port A bit 9, 5V tolerant with FM+ capability, supporting MCO, USART1, I2C1/I2C3 and event output functions |
| 31 | PA10 | bidirectional | General-purpose I/O port A bit 10, 5V tolerant with FM+ capability, supporting USART1 and I2C1 functions |
| 32 | PA11 | bidirectional | General-purpose I/O port A bit 11 supplied by VDDIO2, 5V tolerant, supporting SPI1, USART1 and COMP1 functions |
| 33 | PA12 | bidirectional | General-purpose I/O port A bit 12 supplied by VDDIO2, 5V tolerant, supporting SPI1, USART1 and COMP2 functions |
| 34 | PA13 | bidirectional | General-purpose I/O port A bit 13, 5V tolerant, supporting SWDIO debug interface and LPUART1 receive functions |
| 35 | VSS | power_in | Ground pin, 0 V reference for digital circuits |
| 36 | VDDIO2 | power_in | Isolated positive power supply for PA11 and PA12 pins, 1.65 V to 3.6 V |
| 37 | PA14 | bidirectional | General-purpose I/O port A bit 14, 5V tolerant, supporting SWCLK debug interface and LPUART1 transmit functions |
| 38 | PA15 | bidirectional | General-purpose I/O port A bit 15, 5V tolerant, supporting SPI1, TIM2, USART and USART4 functions |
| 39 | PB3 | bidirectional | General-purpose I/O port B bit 3, 5V tolerant, supporting SPI1, TIM2, USART1 and COMP2 negative input functions |
| 40 | PB4 | bidirectional | General-purpose I/O port B bit 4, 5V tolerant with FM+ capability, supporting SPI1, TIM3/TIM22, USART1 and COMP2 positive input functions |
| 41 | PB5 | bidirectional | General-purpose I/O port B bit 5, 5V tolerant, supporting SPI1, LPTIM1, I2C1 and COMP2 functions |
| 42 | PB6 | bidirectional | General-purpose I/O port B bit 6, 5V tolerant with FM+ capability, supporting USART1, I2C1 and LPTIM1 functions |
| 43 | PB7 | bidirectional | General-purpose I/O port B bit 7, 5V tolerant with FM+ capability, supporting USART1, I2C1, LPTIM1, COMP2 and VREF_PVD functions |
| 44 | BOOT0 | input | Boot mode selection pin, selects between boot from main flash memory or system memory |
| 45 | PB8 | bidirectional | General-purpose I/O port B bit 8, 5V tolerant with FM+ capability, supporting I2C1 clock function |
| 46 | PB9 | bidirectional | General-purpose I/O port B bit 9, 5V tolerant with FM+ capability, supporting I2C1 data and SPI2/I2S2 functions |
| 47 | VSS | power_in | Ground pin, 0 V reference for digital circuits |
| 48 | VDD | power_in | Main positive power supply pin, 1.65 V to 3.6 V |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `STM32L071CZT6TR`
- Footprint: `Package_QFP:LQFP-48_7x7mm_P0.5mm`
- 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
- 3D model files: `stm32l071czt6tr-etched.step` / `stm32l071czt6tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm32l071czt6tr.step` / `stm32l071czt6tr.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/8588941838254280704) (148 pp, sha256 `f413c7ce36b98e6c`, retrieved 2026-10-01, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, 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](docs/stm32l071czt6tr-datasheet.pdf)