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STMicroelectronics STM8S903K3T3CTR — Microcontrollers & Processors (MCU / MPU / DSP)

STM8S903K3T3CTR STMicroelectronics 8-bit MCU, 16 MHz

MPNSTM8S903K3T3CTR
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STMicroelectronics STM8S series, STM8S903K3T3CTR 8-bit MCU, 16 MHz, 8KB (8K x 8) FLASH, 1K x 8 RAM, 640 x 8 EEPROM, 2.95V ~ 5.5V, -40°C ~ 125°C, 32-LQFP (7x7).

$2.8200Ref. price · indicative, final on quote
STMicroelectronics STM8S903K3T3CTR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STM8S903K3T3CTR 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 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 7x10b
Program memory size8KB (8K x 8)

Product details

The STMicroelectronics STM8S903K3T3CTR is an 8-bit MCU from the STM8S value line, built around the STM8 core running at 16 MHz. It carries 8 KB of Flash program memory, 1K x 8 RAM, and 640 x 8 EEPROM — enough for sensor fusion, actuator sequencing, or LIN node firmware in automotive body electronics and industrial control.

8 KB Flash, 640-byte EEPROM — sizing the firmware budget

The 8 KB Flash and 640 x 8 EEPROM set the firmware ceiling. The Flash holds the application code; the EEPROM stores calibration constants, fault logs, or configuration parameters that survive power cycles without wear-leveling overhead. For a LIN slave node running a state machine and ADC sampling loop, 8 KB is comfortable. If the firmware grows beyond that — say, adding a bootloader plus OTA staging — the next density step in the STM8S family uses the same 32-LQFP footprint.

For a procurement review, that means no last-time-buy pressure and no forced requalification.

Frequently asked questions

What is the difference between STM8S903K3T3CTR and STM8S903K3T3C?

The suffix difference is the packaging and shipping medium. The STM8S903K3T3C is the tray or tube variant. The silicon, pinout, and specifications are identical.

What are the alternatives to STM8S903K3T3CTR?

Within the STM8S family, pin-compatible density upgrades use the same 32-LQFP footprint and share the peripheral set. For a second-source discussion or cross-reference to a different architecture, submit an RFQ with your firmware size and I/O requirements.

How to program STM8S903K3T3CTR with ST-Link?

The STM8S903K3T3CTR uses the SWIM (Single Wire Interface Module) debug protocol, not SWD. An ST-Link programmer with SWIM support connects to the SWIM pin and resets the MCU. The STVD or STVP toolchain handles the programming sequence.