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STMicroelectronics STM8S103K3T6C
- Part No.:
- STM8S103K3T6C
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8S103K3T6C.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,354
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Product details
Overview
STM8S103K3T6C from STMicroelectronics is an 8-bit access-line microcontroller featuring a 16 MHz STM8 core, 8 Kbytes Flash program memory, 640 bytes true data EEPROM, 1 Kbyte RAM, 10-bit ADC with up to 5 channels, three timers (including advanced 16-bit TIM1), UART, SPI, and I²C interfaces - deployed in cost-sensitive industrial control and sensor interface applications.
For engineers reviewing the STM8S103K3T6C datasheet, STM8S103K3T6C pinout, STM8S103K3T6C application, or STM8S103K3T6C equivalent, key selection criteria include Flash endurance (10 kcycles), EEPROM retention (20 years at 55 °C), low-power modes (wait/active-halt/halt), 28 I/Os in LQFP32/UFQFPN32 packages, and SWIM single-wire debug interface compatibility.
Technical Context
The STM8S103K3T6C implements a Harvard-architecture STM8 core with 3-stage pipeline and extended instruction set, supporting up to 16 MHz operation across 2.95–5.5 V supply range. Its clock system integrates four sources: external crystal, external clock input, user-trimmable 16 MHz RC, and low-power 128 kHz RC - all monitored by a clock security system.
Interrupt handling uses a nested controller with 32 vectors and up to 27 external interrupts on six priority levels. Memory subsystem includes 8 Kbytes Flash with 20-year data retention at 55 °C, 640-byte EEPROM rated for 300 kcycles, and 1 Kbyte RAM - all accessible via unified memory map with dedicated SWIM debug interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | 16 MHz STM8 8-bit Harvard architecture with 3-stage pipeline and extended instruction set |
| Flash Memory | 8 Kbytes with 10 kcycle endurance and 20-year data retention at 55 °C |
| Data EEPROM | 640 bytes true EEPROM, 300 kcycle write endurance |
| ADC | 10-bit ±1 LSB resolution, up to 5 multiplexed inputs, scan mode, analog watchdog |
| Timers | TIM1 (16-bit advanced, 4 CAPCOM, dead-time insertion), TIM2 (16-bit general purpose), TIM4 (8-bit basic) |
| Communication | UART (LIN/SmartCard/IrDA support), SPI (up to 8 Mbit/s), I²C (up to 400 kbit/s) |
| Supply Voltage | 2.95 V to 5.5 V - enables direct interfacing with 3.3 V and 5 V logic systems |
| I/O Count | Up to 28 I/Os in 32-pin packages, including 21 high-sink outputs for driving LEDs or small loads |
Pinout & Package
STM8S103K3T6C is packaged in UFQFPN32 (5 × 5 mm, 0.5 mm pitch) and LQFP32 (7 × 7 mm) variants. Pin functions are validated per STMicroelectronics DS6120 Rev 15 Section 5.1 and Figure 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power pins support stable core and I/O domain operation; VCAP capacitor required on VDD |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; supports external reset generation and brown-out detection |
| SWIM | Single-wire interface module | Debug and programming interface using one bidirectional pin - no dedicated JTAG/SWD pins needed |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7 | General-purpose I/O ports | 28 total I/Os; multiple ports support alternate functions (UART TX/RX, SPI SCK/MOSI/MISO, I²C SCL/SDA) |
| CLK_OUT | Master clock output | Configurable output of internal/external clock source - useful for synchronizing external peripherals |
| OSC_IN / OSC_OUT | Crystal oscillator connection | Supports low-power crystal resonator (e.g., 32.768 kHz or 1–16 MHz) for precise timing |
Key Features
| Feature | Design Value |
|---|---|
| Low-power operation | Three low-power modes (wait, active-halt, halt) with individual peripheral clock gating - reduces system-level power by >90% in halt mode |
| Robust I/O design | 21 high-sink I/Os capable of 20 mA per pin - eliminates need for external drivers in LED or relay interface circuits |
| Integrated watchdogs | Dual watchdogs: independent (IWDT) and window (WWDT) - ensures fail-safe recovery in safety-critical firmware |
| Unique device ID | 96-bit factory-programmed identifier - enables secure device authentication and firmware binding |
| Flexible clocking | Four selectable clock sources with automatic fallback and clock monitor - improves system reliability under oscillator failure |
| True data EEPROM | 640 bytes of byte-erasable EEPROM with hardware ECC - supports reliable parameter storage without external memory |
Applications
| Industrial Sensor Node | Smart Home Actuator |
|---|---|
Use Scenario: Temperature/humidity sensor node with local display and wireless uplink. IC Role / Device Role / Timing Role: Main controller managing ADC sampling, UART-based sensor fusion, and SPI-driven display driver. Use Value: Integrated 10-bit ADC and 28 GPIOs eliminate external signal conditioning; low-power modes extend battery life beyond 2 years on coin cell. |
Use Scenario: Motorized window blind controller with position feedback and IR remote interface. IC Role / Device Role / Timing Role: Real-time actuator manager executing PWM motor control, quadrature encoder reading, and IR demodulation. Use Value: TIM1's dead-time insertion prevents shoot-through in H-bridge drive; 16 MHz core handles IR protocol timing without jitter. |
| Energy Meter Interface | Appliance Control Panel |
Use Scenario: Residential electricity meter with pulse counting, LCD display, and tamper detection. IC Role / Device Role / Timing Role: Pulse accumulator and display controller interfacing with metrology IC via UART/I²C. Use Value: Hardware UART with LIN master mode supports legacy meter communication; EEPROM stores calibration constants securely. |
Use Scenario: Microwave oven control board with keypad scan, buzzer, and relay sequencing. IC Role / Device Role / Timing Role: System coordinator managing touch input, beeper tone generation, and safety interlock timing. Use Value: Built-in beeper module drives piezo directly; high-sink I/Os drive relays without buffer transistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8S003F3P6 | Same core and peripherals but only 1 Kbyte RAM and 4 Kbytes Flash; TSSOP20 package (20-pin) | Fewer I/Os (16) and no SDIP32/LQFP32 footprint - suitable for space-constrained, lower-feature designs | Select when BOM cost and PCB area are critical, and 28 I/Os or 8 Kbytes Flash are unnecessary. |
| STM8L051F3P6 | Ultra-low-power STM8L core (16 MHz max), 4 Kbytes Flash, 1 Kbyte RAM, but no EEPROM - operates down to 1.8 V | Optimized for battery-powered devices; lacks data EEPROM - requires external nonvolatile storage for configuration | Choose for sub-μA sleep current requirements where EEPROM persistence is handled externally or via Flash wear-leveling. |
Compared with STM8S103K3T6C, STM8S003F3P6 trades Flash size and I/O count for lower cost and smaller footprint, while STM8L051F3P6 sacrifices EEPROM and voltage tolerance for deep-sleep efficiency - neither offers drop-in replacement due to package, memory, or peripheral differences.
Availability
STM8S103K3T6C is available at Aetrix Electronics and suitable for industrial sensor nodes, smart home actuators, energy meter interfaces, and appliance control panels requiring stable component supply across multi-year production cycles.
Supply support for STM8S103K3T6C includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.
The STM8S series targets cost-sensitive, high-volume embedded applications requiring robust peripherals, low-power operation, and mature toolchain support - optimized for rapid development in resource-constrained environments.
FAQ
Does STM8S103K3T6C support in-circuit debugging?
Yes - it features the Single Wire Interface Module (SWIM), enabling full in-circuit debugging and programming via a single bidirectional pin. ST-LINK/V2 and compatible debuggers support SWIM natively, allowing breakpoints, register inspection, and flash programming without dedicated JTAG pins.
What is the maximum operating frequency at 3.3 V supply?
The STM8S103K3T6C supports up to 16 MHz CPU frequency across its full 2.95–5.5 V operating range, including at 3.3 V. This is confirmed in DS6120 Rev 15 Figure 9 and Table 19, which specify fCPUmax = 16 MHz at VDD ≥ 2.95 V.
Can the internal 16 MHz RC oscillator be calibrated?
Yes - the internal 16 MHz RC oscillator is user-trimmable via the CLK_HSICALR register (address 0x50C2). Calibration adjusts frequency in ±1% steps using a 7-bit trim value, enabling compensation for process and temperature variation without external crystal.
Is there hardware support for LIN bus communication?
Yes - the integrated UART supports LIN 2.1/2.2 master mode with automatic sync field generation, break detection, and checksum calculation. This allows direct implementation of LIN slave node communication without software bit-banging or external transceivers.
STM8S103K3T6C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- STM8S
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, IrDA, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 28
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 640 x 8
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.95V ~ 5.5V
- Data Converters:
- A/D 4x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8S103K3T6C FAQ
1.How can I place an order for STM8S103K3T6C through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8S103K3T6C on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM8S103K3T6C reliable?
The price and inventory of STM8S103K3T6C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8S103K3T6C is usually 5 days.
3.What payment methods are accepted for STM8S103K3T6C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8S103K3T6C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8S103K3T6C?
STM8S103K3T6C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8S103K3T6C order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM8S103K3T6C?
For technical support, including STM8S103K3T6C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8S103K3T6C requirements.
6.How does Aetrix verify that STM8S103K3T6C is sourced from the original manufacturer or authorized distributors?
All STM8S103K3T6C products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM8S103K3T6C meets industry standards.
7.What is the process for return or replacement of STM8S103K3T6C?
All STM8S103K3T6C units undergo pre-shipment inspection (PSI). If there is an issue with STM8S103K3T6C, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM8S103K3T6C part is unused and in its original packaging.
Return procedure for STM8S103K3T6C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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