STMicroelectronics STM8S105K6U3A

Overview

STM8S105K6U3A from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 32 Kbyte Flash, 1 Kbyte data EEPROM, 10-bit ADC with 10 channels, and integrated UART, SPI, and I²C interfaces. It operates from 2.95–5.5 V and supports low-power modes including active-halt and halt-used in industrial sensor nodes, motor control feedback units, and smart appliance sub-controllers.

For engineers reviewing the STM8S105K6U3A datasheet, STM8S105K6U3A pinout, STM8S105K6U3A application, or STM8S105K6U3A equivalent, key selection criteria include Flash retention (20 years @ 55 °C), EEPROM endurance (300 kcycle), 16-bit advanced timer with dead-time insertion, high-sink I/O capability (16 pins), and SWIM single-wire debug interface compatibility.

Technical Context

The STM8S105K6U3A implements a Harvard-architecture 8-bit core with 3-stage pipeline and extended instruction set, enabling deterministic real-time execution. Its clock system integrates four independent sources: external crystal, external clock, user-trimmable 16 MHz RC, and low-power 128 kHz RC-with clock security monitoring and flexible peripheral gating.

Interrupt handling uses a nested controller supporting 32 vectors and up to 37 external interrupts across six priority levels. Memory subsystem includes separate program/data address spaces, true EEPROM with hardware write protection, and RAM mapped for fast context switching during interrupt service routines.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; 48-pin quad flat layout optimized for industrial PCB routing and thermal dissipation in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S105K6U3A, STM8S003F3P6 trades EEPROM and advanced peripherals for lower cost and smaller footprint, while STM8L052C6T6 prioritizes sub-µA sleep current over 16 MHz real-time throughput and high-drive I/O-making STM8S105K6U3A optimal for mixed-signal industrial control where both precision timing and robust actuation coexist.

Availability

STM8S105K6U3A is available at Aetrix Electronics and suitable for industrial sensor nodes, motor feedback units, smart appliance sub-controllers, and energy metering interfaces requiring stable component supply across multi-year production cycles.

Supply support for STM8S105K6U3A 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, designing and manufacturing microcontrollers, power management ICs, and MEMS sensors for industrial, automotive, and consumer markets.

The STM8S series targets cost-sensitive, reliability-critical embedded applications-delivering robust 8-bit performance with integrated analog peripherals, low-power operation, and long-term supply assurance for industrial automation and white goods.

FAQ

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

The STM8S105K6U3A achieves 16 MHz CPU frequency across its full operating voltage range of 2.95 V to 5.5 V. At 3.3 V, it sustains full 16 MHz operation with typical current draw of 7.2 mA in run mode (HSE clock source). The fCPUmax vs. VDD curve in Section 10.3.1 confirms no derating below 5.5 V.

Does this MCU support in-system programming via a single pin?

Yes-the SWIM (Single-Wire Interface Module) pin enables full in-circuit programming and debugging using ST-LINK/V2 or compatible tools. No additional pins or bootstrapping resistors are required; SWIM operates independently of reset state and supports read-out protection activation/deactivation.

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

16 I/O pins-distributed across PB and PD ports-are specified as high-sink outputs, each capable of sinking 20 mA continuously at VDD = 5 V (7 mA minimum guaranteed at VDD = 3.3 V). This is verified in Table 38 (Output driving current, standard ports) and applies to dedicated sink-only pins, not general-purpose I/Os.

Is the integrated EEPROM truly independent of Flash, and what is its write endurance?

Yes-the 1 Kbyte data EEPROM is physically separate from Flash memory, with dedicated control logic and erase/write circuitry. It guarantees 300,000 write/erase cycles and 20-year data retention at 55 °C, as validated in Section 10.3.5 (Memory characteristics) and Table 36 (Flash/EEPROM memory specs).