STMicroelectronics STM8S105K4T6C

Overview

STM8S105K4T6C 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 timers including TIM1 with dead-time insertion - deployed in industrial motor control feedback loops, smart sensor nodes, and appliance power management subsystems.

For engineers reviewing the STM8S105K4T6C datasheet, STM8S105K4T6C pinout, STM8S105K4T6C application, or STM8S105K4T6C equivalent, key selection criteria include Flash endurance (10 kcycles), EEPROM retention (20 years at 55 °C), LQFP48 package compatibility, 2.95–5.5 V supply range, and SWIM single-wire debug interface support.

Technical Context

The STM8S105K4T6C implements a Harvard-architecture STM8 core with 3-stage pipeline and extended instruction set, enabling deterministic real-time execution. It integrates a clock security system with dedicated clock monitor and supports four master clock sources: external crystal (up to 24 MHz), external clock input, user-trimmable 16 MHz RC, and low-power 128 kHz RC.

Interrupt handling uses a nested controller supporting 32 interrupts and up to 37 external IRQs across 6 vectors. Memory subsystem includes separate program Flash (16 KB), true data EEPROM (1 KB, 300 kcycle endurance), and RAM (2 KB), all mapped into a unified 24-bit address space with hardware write protection and option byte configuration.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with 48 leads; thermally enhanced exposed pad (EPAD) not present. Pin functions validated per STMicroelectronics DS5855 Rev 16, Section 5.1 (Pin description) and Figure 3 (LQFP48 pinout).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S003F3P6 and STM8L152C6T6, the STM8S105K4T6C uniquely balances industrial-grade voltage range (2.95–5.5 V), on-chip EEPROM endurance (300 kcycles), and hardware motor control peripherals - making it irreplaceable in cost-sensitive 5 V embedded control where reliability and feature integration are non-negotiable.

Availability

STM8S105K4T6C is available at Aetrix Electronics and suitable for industrial motor control, smart home sensor hubs, appliance power management, and POS peripheral controllers requiring stable component supply across multi-year production cycles.

Supply support for STM8S105K4T6C 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 automotive semiconductors since 1987.

The STM8S series targets cost-optimized industrial and consumer embedded applications, emphasizing robustness, ease of certification, and long-term supply stability - with the STM8S105K4T6C specifically engineered for 5 V legacy-system upgrades and motor-control edge nodes.

FAQ

What is the maximum operating frequency of the STM8S105K4T6C at 3.3 V?

The STM8S105K4T6C operates up to 16 MHz at 3.3 V, as confirmed by Figure 11 (fCPUmax vs. VDD) in DS5855 Rev 16. This is enabled by its internal 16 MHz RC oscillator, which is factory-trimmed and user-adjustable via calibration registers - eliminating dependency on external crystals for many applications.

Does the STM8S105K4T6C support in-application programming (IAP) of Flash memory?

Yes, the STM8S105K4T6C supports full IAP via its built-in Flash programming interface. The device includes dedicated Flash write/erase control registers, option bytes for sector protection, and interruptible erase operations - allowing firmware updates over UART or I²C without external programmers.

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

16 I/O pins (specifically PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7 subsets) support high-sink capability, delivering up to 20 mA per pin at VDD = 5 V, as specified in Table 40 (Output driving current - high sink ports) of DS5855 Rev 16. These pins are designated in the pin description table (Table 5) with "HS" marking.

Is the 96-bit unique ID accessible during normal firmware execution?

Yes, the 96-bit unique ID is stored in read-only memory-mapped registers (UIDR1–UIDR3, addresses 0x4865–0x486A) and is accessible at any time during runtime without halting the CPU or entering debug mode - enabling use in secure boot, device fingerprinting, or field firmware activation schemes.