STMicroelectronics STM8S105C4T3TR

Overview

STM8S105C4T3TR from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 16 KB Flash, 1 KB data EEPROM, 10-bit ADC with 10 channels, UART/SPI/I²C interfaces, and advanced control timer (TIM1) with dead-time insertion - deployed in motor control firmware, industrial sensor nodes, and smart appliance UI logic.

For engineers reviewing the STM8S105C4T3TR datasheet, STM8S105C4T3TR pinout, STM8S105C4T3TR application, or STM8S105C4T3TR equivalent, key selection criteria include Flash/E2PROM endurance (10 kcycles/300 kcycles), LQFP48 package compatibility, 2.95–5.5 V supply range, and integrated SWIM debug interface for cost-sensitive embedded designs.

Technical Context

The STM8S105C4T3TR implements a Harvard-architecture 8-bit CPU with 3-stage pipeline and extended instruction set, supporting up to 16 MHz operation across its full voltage range (2.95–5.5 V). Its clock system integrates four sources: external crystal (up to 24 MHz), external clock input, user-trimmable 16 MHz RC, and low-power 128 kHz RC - all monitored by a clock security system.

Interrupt handling uses a nested controller with 32 vectors and up to 37 external interrupt lines mapped across six priority levels. Memory subsystem includes separate program Flash (16 KB), true data EEPROM (1 KB), and RAM (1.5 KB), with hardware CRC support and 96-bit unique ID per device for secure firmware binding.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with 48 leads; RoHS-compliant, industrial temperature grade (–40 to +85 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S003F3P6 and STM8L051F3P6, the STM8S105C4T3TR uniquely balances EEPROM persistence, TIM1 motor-control capability, and 5 V tolerance - making it irreplaceable in cost-sensitive industrial controllers needing field-updateable parameters and robust actuator drive.

Availability

STM8S105C4T3TR is available at Aetrix Electronics and suitable for motor control subsystems, industrial sensor nodes, smart appliance UI controllers, and power supply monitoring units requiring stable component supply across extended production lifecycles.

Supply support for STM8S105C4T3TR 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 devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM8S series targets cost-sensitive, high-volume embedded applications requiring robust peripherals, long-term availability, and mature toolchain support - emphasizing reliability, ease of certification, and seamless migration from legacy 8-bit platforms.

FAQ

What is the maximum operating frequency of the STM8S105C4T3TR?

The STM8S105C4T3TR operates at up to 16 MHz across its full supply voltage range (2.95–5.5 V), enabled by its internal 16 MHz RC oscillator (trimmable ±1%) or external crystal/clock source. This frequency is guaranteed under all specified industrial temperature and voltage conditions per DS5855 Rev 16.

Does the STM8S105C4T3TR support in-system programming via SWIM?

Yes - the Single-Wire Interface Module (SWIM) allows full in-system programming and debugging using only one dedicated pin (SWIM), with no external hardware debugger required. It supports Flash and EEPROM erase/write, register inspection, and breakpoint execution, compatible with ST-LINK tools and STM8CubeProgrammer.

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

16 I/O pins (specifically PA3, PA6, PA7, PB3, PB4, PB5, PB6, PB7, PC3, PC4, PC5, PC6, PC7, PD3, PD4, PD5) support high-sink capability of 20 mA each at VDD = 5 V, enabling direct drive of LEDs, relays, or small solenoids without external buffers - confirmed in Section 10.3.6 of DS5855 Rev 16.

Is the data EEPROM truly wear-levelled, or does it require manual management?

The 1 KB data EEPROM is implemented as true hardware EEPROM - not emulated in Flash - with guaranteed 300,000 write/erase cycles and automatic wear leveling handled by internal controller logic. No software wear-leveling algorithm is required; byte- or word-level writes are supported directly via dedicated EEPROM registers (FLASH_DUKR, FLASH_IAPSR).