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STMicroelectronics STM8S103F3U6ATR — Microcontrollers & Processors (MCU / MPU / DSP)

STM8S103F3U6ATR 8-bit MCU, 16 MHz, 8 KB Flash, 20-UFQFPN

MPNSTM8S103F3U6ATR
Obsolete

STMicroelectronics STM8S103F3U6ATR, 8-bit STM8 core MCU, 16 MHz, 8 KB Flash, 1 KB RAM, 640 B EEPROM, I²C/SPI/UART/LIN, 16 I/O, 5x10-bit ADC, 2.95 V–5.5 V, -40°C to 85°C, 20-UFQFPN (3x3 mm), Tape & Reel.

$1.9500Ref. price · indicative, final on quote
STMicroelectronics STM8S103F3U6ATR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STM8S103F3U6ATR specifications
ParameterValue
SeriesSTM8S
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))2.95V ~ 5.5V
Operating temperature-40°C~85°C(TA)
Speed16MHz
PackageTape & Reel (TR)
RAM size1K x 8
Core size8-Bit
EEPROM size640 x 8
PeripheralsBrown-out Detect/Reset, POR, PWM, WDT
ConnectivityI²C, IrDA, LINbus, SPI, UART/USART
Number of i (O)16
Core processorSTM8
Case20-UFQFN
Data convertersA/D 5x10b
Program memory size8KB (8K x 8)

Product details

8-bit MCU with integrated EEPROM and flexible peripherals

Memory and peripheral fit for embedded control

The 8 KB Flash is sized for small-to-medium control firmware — think motor commutation loops, sensor polling, or communication protocol stacks. The 1 KB SRAM handles modest data buffers, while the 640-byte EEPROM allows parameter storage without external memory. The 16 I/O pins, combined with I²C, SPI, and UART, support common sensor and actuator interfaces. The 10-bit ADC with five channels covers analog inputs like potentiometers, thermistors, or current-sense resistors.

Package and footprint details

Housed in a 20-lead UFQFPN package measuring 3x3 mm, this is a surface-mount-only device. The compact footprint suits dense PCB layouts in portable or space-constrained equipment.

Frequently asked questions

Is STM8S103F3U6ATR obsolete?

Buyers need to know if they can still source the part or must select a replacement.

What is the direct replacement for STM8S103F3U6ATR?

Essential for BOM continuity and avoiding redesign when the original is discontinued.

Where can I buy STM8S103F3U6ATR in stock?

Sourcing buyers need immediate availability to fill orders or maintain production.

What are the exact specifications of STM8S103F3U6ATR?

Design engineers verify fit: speed, memory, pinout, and peripherals.

What is the pin configuration of STM8S103F3U6ATR?

Critical for PCB layout and compatibility with existing designs.

Does STM8S103F3U6ATR have a recommended alternative from the same manufacturer?

Buyers prefer pin-to-pin or software-compatible replacements to minimize change impact.