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STMicroelectronics STM8S105K4T3CTR — Microcontrollers & Processors (MCU / MPU / DSP)

STM8S105K4T3CTR STM8S 8-bit MCU, 16 MHz, 16 KB Flash

MPNSTM8S105K4T3CTR
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STMicroelectronics STM8S series STM8S105K4T3CTR, 8-bit STM8 core, 16 MHz, 16 KB Flash, 2K x 8 RAM, 1K x 8 EEPROM, 25 I/O, 2.95 V to 5.5 V, -40°C to 125°C, 32-LQFP.

$2.9400Ref. price · indicative, final on quote
STMicroelectronics STM8S105K4T3CTR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STM8S105K4T3CTR specifications
ParameterValue
SeriesSTM8S
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))2.95V ~ 5.5V
Operating temperature-40°C~125°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)25
Core processorSTM8
Case32-LQFP
Data convertersA/D 7x10b
Program memory size16KB (16K x 8)

Product details

What the STM8S105K4T3CTR brings to an 8-bit control design

The STM8S105K4T3CTR is an 8-bit microcontroller from STMicroelectronics' STM8S series, built around the STM8 core clocked at 16 MHz.

The 16 MHz clock rate is the performance ceiling for this 8-bit STM8 core. For typical control loops (PID, sensor polling, PWM updates) running from Flash with zero wait states, instruction throughput is deterministic at roughly one cycle per instruction for simple operations.

Memory map and peripheral set

With 16 KB of Flash, 2 KB of RAM, and 1 KB of EEPROM, this part handles moderate firmware images and keeps calibration constants or configuration data in the EEPROM without an external serial memory. The 1 KB EEPROM endurance matters for field-update counters or wear-leveled parameter storage.

For current-production parts like this, we source through authorized distribution channels and can quote against an RFQ with confirmed availability and pricing.

Frequently asked questions

Where can I buy STM8S105K4T3CTR and get a price?

We source the STM8S105K4T3CTR through independent distribution and can provide a quote against an RFQ.

Does STM8S105K4T3CTR have an internal oscillator?

Yes, the oscillator type is internal. An external crystal is not required for the core clock, though the internal RC accuracy should be checked against your timing budget for serial-communication baud rates.

What is the closest pin-compatible alternative to STM8S105K4T3CTR?

Within the STM8S105 family, pin-compatible density variants are available with different Flash and RAM sizes. For a direct drop-in with the same 32-LQFP footprint and peripheral set, look at the STM8S105K6T3C (32 KB Flash) or STM8S105C6T6 (32 KB Flash, 48-pin LQFP) — verify the specific order code against your BOM for exact memory and temperature grade.

Is STM8S105K4T3CTR RoHS compliant?

The STM8S105K4T3CTR is manufactured as RoHS compliant per STMicroelectronics' standard for the STM8S series. The 'T3' suffix in the order code indicates lead-free soldering reflow compatibility.