Skip to main content
Log in
STMicroelectronics STM8S105S4T6CTR — Microcontrollers & Processors (MCU / MPU / DSP)

STM8S105S4T6CTR 8-bit MCU, 16KB Flash, 44-LQFP

MPNSTM8S105S4T6CTR
Active

STMicroelectronics STM8S series, STM8S105S4T6CTR, 8-bit MCU, 16 MHz, 16KB Flash (16K x 8), 2K x 8 RAM, 1K x 8 EEPROM, 34 I/O, I²C/SPI/UART/LIN/IrDA, 2.95V–5.5V, -40°C to 85°C, 44-LQFP (10x10 mm).

$2.9800Ref. price · indicative, final on quote
STMicroelectronics STM8S105S4T6CTR datasheet (PDF)
Packaging44-LQFP
RoHSROHS3 Compliant
SeriesSTM8S
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STM8S105S4T6CTR 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) Cut Tape (CT)
RAM size2K x 8
Core size8-Bit
EEPROM size1K x 8
PeripheralsBrown-out Detect/Reset, POR, PWM, WDT
ConnectivityI²C, IrDA, LINbus, SPI, UART/USART
Number of i (O)34
Core processorSTM8
Case44-LQFP
Data convertersA/D 9x10b
Program memory size16KB (16K x 8)

Product details

What this 8-bit MCU brings to a control board

Memory and peripheral budget for a BOM line

With 16 KB of Flash and 2 KB of RAM, this MCU fits firmware footprints for sensor polling, relay logic, and simple communication stacks. The 1 KB EEPROM handles calibration constants and configuration data without needing an external serial EEPROM. On the peripheral side, you get I²C, SPI, UART/USART, LIN, and IrDA — enough to talk to common sensors, actuators, and display modules. The 34 general-purpose I/O pins in the 44-LQFP package give headroom for parallel interfaces or matrix keypads.

Frequently asked questions

Is STM8S105S4T6CTR RoHS compliant?

Yes, it is ROHS3 compliant per the manufacturer's listing.

What are the alternatives to STM8S105S4T6CTR?

A functional alternative in a different architecture is the STM32L151CBU6A, a 32-bit ARM Cortex-M3 MCU at 32 MHz with more memory and a 1.8 V supply — but it is not pin-compatible and requires a different toolchain. For a drop-in replacement within the STM8S family, look at higher-density siblings like the STM8S105K6 or STM8S105C6, which share the same core and peripherals but differ in Flash/RAM size and package.