STMicroelectronics STM8S103K3U6TR

Overview

STM8S103K3U6TR from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 8 Kbytes Flash program memory, 640 bytes true data EEPROM, 10-bit ADC with 5 channels, three timers (including advanced 16-bit TIM1), and UART/SPI/I²C interfaces - deployed in industrial sensor nodes, motor control modules, and smart appliance UI subsystems.

For engineers reviewing the STM8S103K3U6TR datasheet, STM8S103K3U6TR pinout, STM8S103K3U6TR application, or STM8S103K3U6TR equivalent, key selection criteria include its 32-pin UFQFPN package, 2.95–5.5 V supply range, nested interrupt controller supporting 32 vectors, low-power active-halt mode (<1.5 µA), and SWIM single-wire debug interface for space-constrained embedded designs.

Technical Context

The STM8S103K3U6TR implements a Harvard-architecture STM8 core with 3-stage pipeline and extended instruction set, enabling deterministic real-time execution at up to 16 MHz. Its clock system integrates four independent sources: external crystal (up to 16 MHz), external clock input, user-trimmable 16 MHz RC, and low-power 128 kHz RC - all monitored by a clock security system.

Peripheral integration includes a 16-bit advanced control timer (TIM1) with dead-time insertion and complementary outputs for motor gate driving; a 16-bit general-purpose timer (TIM2); an 8-bit basic timer (TIM4); and UART with SmartCard/IrDA/LIN master support - all configurable via dedicated register maps and clock-gating bits in CLK_PCKENR1/2.

Key Specifications

Pinout & Package

STM8S103K3U6TR is packaged in a 32-pin UFQFPN (5 × 5 mm, 0.5 mm pitch), optimized for compact PCB layouts and thermal performance in space-constrained applications. Pin functions are validated per ST's DS6120 Rev 15, Section 5.1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8S103K3U6TR, STM8S003F3P6 trades memory and I/O for lower cost and footprint, while EFM8BB10F8G sacrifices EEPROM reliability and analog integrity for marginally faster 8051 execution - neither matches the balanced feature set for cost-sensitive industrial control.

Availability

STM8S103K3U6TR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart appliance UI subsystems, brushless DC motor starters, and energy meter front-ends requiring stable component supply and long-term manufacturability.

Supply support for STM8S103K3U6TR 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 devices for industrial, automotive, and consumer markets.

The STM8S series targets cost-sensitive, resource-constrained embedded applications where deterministic real-time behavior, low power, and debug simplicity outweigh 32-bit compute density - emphasizing robustness, longevity, and toolchain maturity.

FAQ

Does STM8S103K3U6TR support in-application programming (IAP) of Flash memory?

Yes. The device supports IAP via its built-in bootloader and SWIM interface, allowing firmware updates without external programmers. Flash write/erase operations are controlled through dedicated registers (FLASH_CR1/CR2) and require proper unlock sequences. Verified operation includes sector erase (1 Kbyte) and byte/word programming with automatic ECC generation.

What is the maximum operating temperature for STM8S103K3U6TR in industrial applications?

The STM8S103K3U6TR is qualified for industrial temperature range: –40 °C to +85 °C ambient. Thermal characteristics (DS6120 Rev 15, Table 58) specify θ_JA = 150 °C/W for UFQFPN32, enabling reliable operation at full 16 MHz clock speed up to 85 °C with standard PCB copper pour.

Can the 10-bit ADC operate independently while the MCU is in active-halt mode?

No. The ADC requires the APB clock (PCLK) to function and is disabled in active-halt mode. However, the Auto Wake-Up Timer (AWU) can trigger exit from active-halt, then initiate ADC conversion in run mode - achieving low-power periodic sampling with typical wakeup-to-conversion latency under 10 µs.

Is the 96-bit unique ID accessible via standard memory-mapped registers?

Yes. The unique ID is stored in read-only memory at addresses 0x4865–0x486A (6 bytes) and 0x4870–0x4875 (6 bytes), accessible via standard LDW/STW instructions. No special unlock sequence is required, and reads are supported in all power modes except reset state.