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STM8S903F3M6

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STMicroelectronics Microcontroller Units (MCUs/MPUs/SOCs), SOIC-20-300mil. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

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STM8S903F3M6

STMicroelectronics · Microcontroller Units (MCUs/MPUs/SOCs) · SOIC-20-300mil

STM8S903F3M6 from STMicroelectronics, in a SOIC-20-300mil. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
4 NRST bidirectional Reset input with internal 30-80 kΩ pull-up resistor and filtered input for active-low asynchronous reset.
5 PA1/OSCIN bidirectional Port A pin with oscillator crystal/resonator input for high-speed external clock source (1-16 MHz).
6 PA2/OSCOUT bidirectional Port A pin with oscillator crystal/resonator output for external crystal/resonator operation (1-16 MHz).
7 VSS power_in Digital ground (0V reference) for power return and signal reference.
8 VCAP power_out 1.8V regulated output from internal voltage regulator requiring external 470-3300 nF capacitor with ESR 0-0.3 Ω.
9 VDD power_in Digital power supply input (2.95-5.5V operating range) with maximum 100 mA total source capability.
10 PA3/TIM5_CH3 bidirectional Port A GPIO pin with Timer 5 channel 3 capture/compare/PWM, remappable to SPI master/slave select or UART1 transmit.
11 PB5/I2C_SDA bidirectional Port B GPIO pin with I2C data line (true open-drain output, 400 kbit/s maximum), alternate Timer 1 break input.
12 PB4/I2C_SCL bidirectional Port B GPIO pin with I2C clock line (true open-drain output, 400 kbit/s maximum), alternate ADC external trigger.
13 PC3/TIM1_CH3/TLI bidirectional Port C GPIO pin for Timer 1 channel 3 capture/compare or top-level interrupt input, remappable to Timer 1 inverted channel 1.
14 PC4/TIM1_CH4/CLK_CCO/AIN2 bidirectional Port C GPIO pin with Timer 1 channel 4, configurable master clock output, or 10-bit ADC input channel 2 (0-VDD).
15 PC5/SPI_SCK bidirectional Port C GPIO pin with SPI serial clock output (8 Mbit/s master, 7 Mbit/s slave), remappable to Timer 5 channel 1.
16 PC6/SPI_MOSI bidirectional Port C GPIO pin with SPI master out/slave in data line (8 Mbit/s bidirectional), remappable to Timer 1 channel 1.
17 PC7/SPI_MISO bidirectional Port C GPIO pin with SPI master in/slave out data line (8 Mbit/s bidirectional), remappable to Timer 1 channel 2.
18 PD1/SWIM bidirectional Port D GPIO pin for single-wire interface module (SWIM) debug communication with 145 bytes/ms maximum data rate.
19 PD2/AIN3 bidirectional Port D GPIO pin with 10-bit ADC analog input channel 3 (input range 0-VDD), remappable to Timer 5 channel 3.
20 PD3/AIN4/TIM5_CH2/ADC_ETR bidirectional Port D GPIO pin with 10-bit ADC input channel 4, Timer 5 channel 2, or ADC external trigger input.
1 PD4/TIM5_CH1/BEEP bidirectional Port D GPIO pin with Timer 5 channel 1, BEEP audio output (1, 2, or 4 kHz selectable), or UART1 clock via option byte.
2 PD5/AIN5/UART1_TX bidirectional Port D GPIO pin with 10-bit ADC analog input channel 5 (0-VDD) or UART1 transmit data output (1 Mbit/s maximum).
3 PD6/AIN6/UART1_RX bidirectional Port D GPIO pin with 10-bit ADC analog input channel 6 (0-VDD) or UART1 receive data input (1 Mbit/s maximum).

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOIC-20-300mil
Category Single Chip Microcomputer/Microcontroller
Pins 20

CAD (KiCad official)

  • Symbol: STM8S903F3M6
  • Footprint: Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm
  • 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
  • 3D model files: stm8s903f3m6-etched.step / stm8s903f3m6-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); stm8s903f3m6.step / stm8s903f3m6.glb are the bare package body.

Provenance

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

  • Datasheet: STMicroelectronics datasheet (124 pp, sha256 76ef2064c8429253, retrieved 2026-09-22, 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