# STM8S003F3P6

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

STM8S003F3P6 from STMicroelectronics, in a TSSOP-20. 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 | PD4 | bidirectional | Port D4 GPIO with high-sink output, alternate functions: Timer 2 channel 1, BEEP output, UART1 clock. |
| 2 | PD5 | bidirectional | Port D5 GPIO with high-sink output, alternate functions: analog input 5, UART1 transmit data. |
| 3 | PD6 | bidirectional | Port D6 GPIO with high-sink output, alternate functions: analog input 6, UART1 receive data. |
| 4 | NRST | input | Reset input pin with open-drain output capability and internal pull-up resistor. |
| 5 | PA1 | bidirectional | Port A1 GPIO, alternate function: OSCIN (oscillator crystal input). |
| 6 | PA2 | bidirectional | Port A2 GPIO, alternate function: OSCOUT (oscillator crystal output). |
| 7 | VSS | power_in | Digital ground reference. |
| 8 | VCAP | power_in | 1.8 V internal regulator decoupling capacitor pin; requires 470-3300 nF external capacitor with ESR ≤ 15 Ω. |
| 9 | VDD | power_in | Digital power supply; operating voltage 2.95 to 5.5 V. |
| 10 | PA3 | bidirectional | Port A3 GPIO with high-sink output, alternate functions: Timer 2 channel 3, SPI master/slave select (AFR1 remapping). |
| 11 | PB5 | bidirectional | Port B5 true open-drain GPIO, alternate functions: I2C SDA (data), Timer 1 break input (AFR4 remapping). |
| 12 | PB4 | bidirectional | Port B4 true open-drain GPIO, alternate functions: I2C SCL (clock), ADC external trigger (AFR4 remapping). |
| 13 | PC3 | bidirectional | Port C3 GPIO with high-sink output, alternate functions: Timer 1 channel 3, top level interrupt, Timer 1 inverted channel 1. |
| 14 | PC4 | bidirectional | Port C4 GPIO with high-sink output, alternate functions: Timer 1 channel 4, configurable clock output, analog input 2, Timer 1 inverted channel 2. |
| 15 | PC5 | bidirectional | Port C5 GPIO with high-sink output, alternate functions: SPI clock, Timer 2 channel 1 (AFR0 remapping). |
| 16 | PC6 | bidirectional | Port C6 GPIO with high-sink output, alternate functions: SPI MOSI (master out/slave in), Timer 1 channel 1 (AFR0 remapping). |
| 17 | PC7 | bidirectional | Port C7 GPIO with high-sink output, alternate functions: SPI MISO (master in/slave out), Timer 1 channel 2 (AFR0 remapping). |
| 18 | PD1 | bidirectional | Port D1 GPIO with high-sink output, alternate function: SWIM (single-wire interface module) data interface. |
| 19 | PD2 | bidirectional | Port D2 GPIO with high-sink output, alternate functions: analog input 3, Timer 2 channel 3 (AFR1 remapping). |
| 20 | PD3 | bidirectional | Port D3 GPIO with high-sink output, alternate functions: analog input 4, Timer 2 channel 2, ADC external trigger. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `STM8S003F3P6`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `stm8s003f3p6-etched.step` / `stm8s003f3p6-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stm8s003f3p6.step` / `stm8s003f3p6.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/8579708309418328064) (100 pp, sha256 `79e0b6f021db8416`, retrieved 2026-09-23, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-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/stm8s003f3p6-datasheet.pdf)