STMicroelectronics STM8S105S6T3C

Overview

STM8S105S6T3C from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 32 Kbyte Flash with 20-year data retention at 55 °C, 1 Kbyte true EEPROM (300 kcycle endurance), 10-bit ADC with 10-channel multiplexing, and integrated UART/SPI/I²C interfaces. It targets cost-sensitive industrial control, appliance HMI, and sensor node applications requiring robust I/O (up to 38 pins) and low-power operation.

For engineers reviewing the STM8S105S6T3C datasheet, STM8S105S6T3C pinout, STM8S105S6T3C application, or STM8S105S6T3C equivalent, key selection criteria include Flash/E²PROM endurance specs, 16 MHz clock stability across 2.95–5.5 V supply, nested interrupt support (32 vectors), and LQFP48 package compatibility with high-sink I/O capability.

Technical Context

The STM8S105S6T3C implements a Harvard-architecture STM8 core with 3-stage pipeline and extended instruction set, enabling deterministic real-time execution. Its clock system integrates four independent sources: user-trimmable 16 MHz RC, 128 kHz low-power RC, crystal oscillator, and external clock input-each monitored by a dedicated clock security system.

Interrupt handling uses a nested controller supporting up to 37 external interrupts across six vectors, with priority management and automatic context save/restore. Memory subsystem includes separate Flash (program), true data EEPROM (nonvolatile storage), and RAM (2 Kbyte), all mapped into distinct address spaces with hardware write protection for EEPROM sectors.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with 48 leads; thermally enhanced for industrial ambient operation up to 125 °C junction temperature.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with STM8S105S6T3C, STM8S003F3P6 sacrifices EEPROM, ADC channels, and timer capability for lower cost and size, while STM8L052C6T6 trades 5 V tolerance and high-drive I/O for superior energy efficiency-neither offers drop-in replacement without hardware or firmware revision.

Availability

STM8S105S6T3C is available at Aetrix Electronics and suitable for industrial motor control, smart appliance HMI, and wireless sensor node designs requiring stable component supply, long-term manufacturability, and full production lifecycle support.

Supply support for STM8S105S6T3C includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM8S series delivers cost-optimized 8-bit MCUs targeting industrial control, home appliances, and sensor interfaces-emphasizing robustness, low-power operation, and seamless integration with ST's ecosystem of development tools and firmware libraries.

FAQ

What is the maximum operating frequency and voltage range for STM8S105S6T3C?

The STM8S105S6T3C operates at up to 16 MHz across a supply voltage range of 2.95 V to 5.5 V. Its internal 16 MHz RC oscillator is user-trimmable to ±1% accuracy at 25 °C and maintains ±2.5% stability over the full temperature range (–40 to +125 °C) when calibrated at one point.

Does STM8S105S6T3C support in-circuit debugging and programming?

Yes-it features a Single Wire Interface Module (SWIM) that enables non-intrusive in-circuit debugging and flash programming using ST-LINK/V2 or ST-LINK/V2-1 debug probes. SWIM requires only one pin (SWIM on PF7) and supports full breakpoint, step-through, and memory inspection capabilities.

How many I/O pins support high-sink capability, and what is the rated current?

16 I/O pins (PA0–PA7, PB0–PB7, PC0–PC1, PD0–PD1, PE0–PE1, PF0–PF1) are designated as high-sink outputs, each capable of sinking up to 20 mA continuously at VDD = 5 V. Total sink current across all high-sink pins must not exceed 80 mA to maintain output voltage compliance.

What are the EEPROM endurance and data retention specifications?

The integrated 1 Kbyte data EEPROM is rated for 300,000 write/erase cycles per byte and guarantees data retention for 20 years at 55 °C ambient temperature. Retention extends beyond 40 years at 25 °C, and sector write protection prevents accidental erasure during firmware updates.