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STMicroelectronics STM8S103K3T6C — Microcontrollers & Processors (MCU / MPU / DSP)

ST STM8S103K3T6C 8-bit MCU, 16 MHz, 8 KB Flash, 32-LQFP

MPNSTM8S103K3T6C
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STMicroelectronics STM8S103K3T6C, STM8S series 8-bit MCU, 16 MHz, 8 KB Flash, 1 KB RAM, 640 B EEPROM, 2.95 V to 5.5 V, -40 to 85°C, 32-LQFP.

$2.4500Ref. price · indicative, final on quote
STMicroelectronics STM8S103K3T6C datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STM8S103K3T6C 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
PackageTray
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)28
Core processorSTM8
Case32-LQFP
Data convertersA/D 4x10b
Program memory size8KB (8K x 8)

Product details

The STM8S103K3T6C is an 8-bit MCU with an STM8 core running at 16 MHz. It has 8 KB Flash, 1 KB RAM, and 640 bytes EEPROM, operating from 2.95 V to 5.5 V. The 32-LQFP package provides 28 I/O lines.

The 16 MHz clock rate is enough for a 10 ms control loop with sensor polling and a UART transaction; for faster PWM update rates or multiple serial ports running simultaneously, check the instruction-cycle budget against your interrupt latency.

Memory sizing — Flash, RAM, and EEPROM

8 KB of Flash holds a bootloader and main loop. The 1 KB RAM handles buffers and stack. The 640-byte EEPROM stores calibration constants or fault logs.

Frequently asked questions

What is the operating temperature range of STM8S103K3T6C?

The operating temperature range is -40°C to 85°C.

Does STM8S103K3T6C have an internal oscillator?

Yes, it has an internal oscillator, which eliminates the need for an external crystal in many designs.

Can STM8S103K3T6C be programmed with ST-Link?

Yes, the STM8S103K3T6C supports programming and debugging via the ST-Link tool, which connects to the SWIM (Single Wire Interface Module) interface.

What is the pinout of STM8S103K3T6C?

The STM8S103K3T6C is in a 32-LQFP package with 28 I/O pins. The pinout follows the standard STM8S103K3 mapping; the datasheet provides the full pin assignment table.