STMicroelectronics STM8S105C6T6TR

Overview

STM8S105C6T6TR from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 32 Kbyte Flash memory with 20-year data retention at 55 °C, 1 Kbyte true data EEPROM (300 kcycle endurance), 10-bit ADC with up to 10 channels, and integrated UART, SPI, and I²C interfaces - deployed in industrial sensor nodes and motor control subsystems.

For engineers reviewing the STM8S105C6T6TR datasheet, STM8S105C6T6TR pinout, STM8S105C6T6TR application, or STM8S105C6T6TR equivalent, key selection criteria include its LQFP48 package, 38 I/Os (16 high-sink), dual watchdog timers, flexible clock sources (16 MHz RC, crystal, external), and SWIM single-wire debug interface for cost-sensitive embedded control.

Technical Context

The STM8S105C6T6TR implements a Harvard-architecture 8-bit core with 3-stage pipeline and extended instruction set, supporting nested interrupts across 32 vectors and up to 37 external interrupt inputs. Its clock system integrates four independent sources: user-trimmable 16 MHz RC, low-power 128 kHz RC, crystal resonator, and external clock input - all monitored by a dedicated clock security system.

Memory architecture separates 32 Kbyte Flash (program), 1 Kbyte true data EEPROM (nonvolatile storage), and 2 Kbyte RAM, with hardware support for scan-mode ADC, advanced timer TIM1 (16-bit, 4 CAPCOM, dead-time insertion), and two general-purpose 16-bit timers (TIM2/TIM3) - enabling precise timing and signal generation in real-time control loops.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed pad for thermal enhancement and mechanical stability in industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S105C6T6TR, STM8S003F3P6 trades EEPROM and I/O count for lower cost and size, while STM8L052C6T6 sacrifices high-sink capability and voltage range to achieve 10× lower active-halt current - making each suitable for distinct power, feature, and budget constraints.

Availability

STM8S105C6T6TR is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, home appliance UI panels, and PLC digital I/O modules requiring stable component supply and long-term production support.

Supply support for STM8S105C6T6TR 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 management ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM8S series targets cost-sensitive, high-reliability embedded control applications - delivering robust peripherals, low-power operation, and mature toolchain support for rapid development of industrial and appliance-grade systems.

FAQ

What is the maximum operating frequency and corresponding supply voltage range?

The STM8S105C6T6TR operates at up to 16 MHz across its full 2.95–5.5 V supply range. At 5.5 V, it sustains 16 MHz reliably; at 2.95 V, maximum frequency drops to approximately 12 MHz per Figure 11 in DS5855 Rev 16. This voltage-frequency scaling is enforced by internal clock monitoring and does not require software intervention.

Does this MCU support in-circuit debugging without additional hardware?

Yes - the STM8S105C6T6TR integrates a Single-Wire Interface Module (SWIM) that enables full debugging (breakpoints, register inspection, memory read/write) and programming using only one dedicated pin (SWIM) and ground. No JTAG header or external debugger is needed beyond a compatible ST-LINK/V2 or equivalent programmer.

How is the 1 Kbyte data EEPROM endurance verified?

STMicroelectronics specifies 300,000 write/erase cycles for the embedded data EEPROM, validated per JEDEC JESD22-A117 stress testing methodology. Endurance is guaranteed across the full industrial temperature range (–40 to +85 °C), with data retention of 20 years at 55 °C after 10,000 cycles - documented in Section 10.3.5 of DS5855 Rev 16.

Can the high-sink I/Os drive standard 5 V relays directly?

Yes - 16 pins (e.g., PD0–PD7, PE0–PE7) support 20 mA sink current at VDD = 5 V with VOL ≤ 0.4 V (per Table 38), sufficient to activate common 5 V, 70–100 Ω coil relays. However, an external flyback diode remains mandatory to suppress inductive kickback and protect the I/O structure.