# STM8L101F3P6

**STMicroelectronics** · Microcontrollers (MCU/MPU/SOC) · TSSOP-20

STM8L101F3P6 from STMicroelectronics, in a TSSOP-20. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | PC3/USART_TX | bidirectional | Port C3 is a high sink/source (20 mA) I/O that serves as the USART transmit output. |
| 2 | PC4/USART_CK/CCO | bidirectional | Port C4 is a high sink/source (20 mA) I/O that serves as the USART synchronous clock or the configurable clock output (CCO). |
| 3 | PA0/SWIM/BEEP/IR_TIM | bidirectional | Port A0 is in input pull-up during reset and after reset release, carries the SWIM input/output, Beep output and infrared timer output, and is the only pin with 20 mA high sink LED driver capability. |
| 4 | NRST/PA1 | bidirectional | At power-up this pin is a reset input with pull-up; as general purpose PA1 it can only be configured as push-pull output, not open-drain or general purpose input, and it is 20 mA high sink/source. |
| 5 | PA2 | bidirectional | Port A2 is a general purpose I/O with 20 mA high sink/source capability. |
| 6 | PA3 | bidirectional | Port A3 is a general purpose I/O with 20 mA high sink/source capability. |
| 7 | VSS | power_in | Ground reference pin for the device. |
| 8 | VDD | power_in | Power supply pin; the operating supply range of the device is 1.65 V to 3.6 V. |
| 9 | PD0/TIM3_CH2/COMP1_CH3 | bidirectional | Port D0 is a high sink/source (20 mA) I/O that serves as Timer 3 channel 2 or comparator 1 channel 3 input. |
| 10 | PB0/TIM2_CH1/COMP1_CH1 | bidirectional | Port B0 is a high sink/source (20 mA) I/O with a pull-up applied during reset, becoming input floating after reset release, and serves as Timer 2 channel 1 or comparator 1 channel 1. |
| 11 | PB1/TIM3_CH1/COMP1_CH2 | bidirectional | Port B1 is a high sink/source (20 mA) I/O that serves as Timer 3 channel 1 or comparator 1 channel 2. |
| 12 | PB2/TIM2_CH2/COMP2_CH1 | bidirectional | Port B2 is a high sink/source (20 mA) I/O that serves as Timer 2 channel 2 or comparator 2 channel 1. |
| 13 | PB3/TIM2_ETR/COMP2_CH2 | bidirectional | Port B3 is a high sink/source (20 mA) I/O that serves as Timer 2 trigger input or comparator 2 channel 2. |
| 14 | PB4/SPI_NSS | bidirectional | Port B4 is a high sink/source (20 mA) I/O with a pull-up applied during reset, becoming input floating after reset release, and serves as the SPI master/slave select. |
| 15 | PB5/SPI_SCK | bidirectional | Port B5 is a high sink/source (20 mA) I/O that serves as the SPI clock. |
| 16 | PB6/SPI_MOSI | bidirectional | Port B6 is a high sink/source (20 mA) I/O that serves as the SPI master out / slave in. |
| 17 | PB7/SPI_MISO | bidirectional | Port B7 is a high sink/source (20 mA) I/O that serves as the SPI master in / slave out. |
| 18 | PC0/I2C_SDA | bidirectional | Port C0 is a true open-drain I/O (no weak pull-up and no protection diode to VDD) that serves as the I2C data line. |
| 19 | PC1/I2C_SCL | bidirectional | Port C1 is a true open-drain I/O (no weak pull-up and no protection diode to VDD) that serves as the I2C clock line. |
| 20 | PC2/USART_RX | bidirectional | Port C2 is a high sink/source (20 mA) I/O that serves as the USART receive input. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | TSSOP-20 |
| Category | Embedded Processors & Controllers |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `STM8L101F3P6`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `stm8l101f3p6-etched.step` / `stm8l101f3p6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm8l101f3p6.step` / `stm8l101f3p6.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/8579708296280145920) (83 pp, sha256 `4f4c1c4df5129ba4`, 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/stm8l101f3p6-datasheet.pdf)