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STMicroelectronics STM8S903K3T6C
- Part No.:
- STM8S903K3T6C
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8S903K3T6C.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,455
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Product details
Overview
STM8S903K3T6C from STMicroelectronics is an 8-bit microcontroller featuring a 16 MHz STM8 core, 8 Kbytes Flash, 1 Kbyte RAM, and 640 bytes EEPROM. It integrates a 10-bit ADC with 7 multiplexed channels, UART, SPI, I²C, two 16-bit timers (including advanced control timer TIM1), and operates from 2.95–5.5 V. It is used in industrial sensor nodes requiring low-power operation and mixed-signal control.
For engineers reviewing the STM8S903K3T6C datasheet, STM8S903K3T6C pinout, STM8S903K3T6C application, or STM8S903K3T6C equivalent, key selection criteria include its 32-pin LQFP/UFQFPN package compatibility, nested interrupt controller supporting 32 interrupts, true data EEPROM endurance (300 kcycle), low-power active-halt mode current (0.35 µA typ), and SWIM single-wire debug interface.
Technical Context
The STM8S903K3T6C implements a Harvard-architecture 8-bit core with 3-stage pipeline and extended instruction set, enabling deterministic real-time execution. Its clock system includes four master sources: external crystal, external clock input, user-trimmable 16 MHz RC, and low-power 128 kHz RC - all managed by a clock security system with monitor.
Interrupt handling uses a nested controller with 32 vectors and up to 28 external interrupt inputs mapped across 7 priority levels. Peripheral clock gating allows selective disabling of UART, SPI, I²C, ADC, and timer clocks to reduce dynamic power consumption during idle phases.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8 8-bit Harvard core with 3-stage pipeline; enables deterministic timing for real-time control loops. |
| Max Clock Frequency | 16 MHz at 2.95–5.5 V supply; supports high-speed peripheral operation without external PLL. |
| Flash Memory | 8 Kbytes Flash with 20-year data retention at 55 °C after 10 kcycles; suitable for field-upgradable firmware. |
| Data EEPROM | 640 bytes true data EEPROM with 300 kcycle endurance; retains calibration data across power cycles. |
| ADC Resolution | 10-bit SAR ADC with ±1 LSB INL/DNL; supports accurate sensor signal digitization with internal reference. |
| Timers | TIM1 (16-bit advanced control), TIM5 (16-bit general purpose), TIM6 (8-bit basic), AWU; enables motor control, PWM generation, and periodic wake-up. |
| I/O Count | Up to 28 I/Os in 32-pin packages including 21 high-sink outputs; drives LEDs, relays, and logic directly without buffers. |
| Debug Interface | Single Wire Interface Module (SWIM); enables full in-circuit debugging and programming using one pin. |
Pinout & Package
LQFP32 (7 × 7 mm) and UFQFPN32 (5 × 5 mm) packages are supported; both use identical pin mapping per datasheet section 5.4–5.5. Pin functions include dedicated SWIM, NRST, VCAP, and configurable alternate-function I/Os.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main 2.95–5.5 V supply rail; requires external 100 nF decoupling capacitor near pin. |
| VSS | Ground | Digital ground reference; separate analog ground not required (single-supply design). |
| VCAP | Capacitor connection | Connects to 1 µF ceramic capacitor for internal voltage regulator stability. |
| NRST | Reset input | Active-low reset with Schmitt trigger; supports external pull-up and debounced push-button reset. |
| SWIM | Debug interface | Single-wire bidirectional debug port; enables flash programming and real-time variable inspection. |
| PA0–PA7 | General-purpose I/O | 8-bit port A with alternate functions including UART TX/RX, SPI SCK/MOSI/MISO, and ADC inputs. |
| PB0–PB7 | General-purpose I/O | 8-bit port B with TIM1 channel outputs, I²C SCL/SDA, and high-sink capability (up to 100 mA sink per pin). |
| PC0–PC7 | General-purpose I/O | 8-bit port C with TIM5 channels, UART CLK output, and programmable pull-up/pull-down resistors. |
Key Features
| Feature | Design Value |
|---|---|
| Low-power modes | Wait, active-halt (0.35 µA typ), and halt (0.25 µA typ); extends battery life in sensor endpoints. |
| Internal RC oscillators | User-trimmable 16 MHz HSI and 128 kHz LSI; eliminates external crystal cost and board space. |
| Robust I/O design | Immune to current injection up to 100 mA; withstands ESD per IEC 61000-4-2 Level 4 (±8 kV contact). |
| True data EEPROM | 640 bytes with independent erase/write cycles; avoids wear leveling firmware overhead. |
| Advanced control timer (TIM1) | 16-bit with 4 CAPCOM channels, 3 complementary outputs, dead-time insertion; supports 3-phase motor control. |
| Unique 96-bit ID | Factory-programmed serial number per device; enables secure device authentication and traceability. |
Applications
| Industrial Sensor Node | Smart HVAC Actuator |
|---|---|
Use Scenario: Standalone temperature/humidity sensor with local display and wireless reporting. IC Role / Device Role / Timing Role: Main system controller managing ADC sampling, UART communication to transceiver, and low-power sleep scheduling. Use Value: Integrated 10-bit ADC and ultra-low halt-mode current (0.25 µA) enable multi-year battery life with periodic wake-up. |
Use Scenario: Motorized damper control in commercial HVAC systems with position feedback and fault detection. IC Role / Device Role / Timing Role: Real-time actuator controller executing PID loop, driving H-bridge via TIM1 complementary outputs with dead-time. Use Value: TIM1's hardware dead-time insertion prevents shoot-through in MOSFET drivers, improving reliability. |
| Programmable Power Supply Monitor | Embedded Smart Meter Subsystem |
Use Scenario: Voltage/current monitoring module for AC/DC power supplies with overvoltage lockout and logging. IC Role / Device Role / Timing Role: Analog front-end processor acquiring signals via ADC, storing events in EEPROM, and signaling faults via GPIO. Use Value: 640-byte EEPROM endurance (300 kcycle) ensures >10 years of daily event logging without wear-out. |
Use Scenario: Tamper-detection and pulse-counting subsystem in residential electricity meters. IC Role / Device Role / Timing Role: Dedicated metering co-processor handling isolated pulse inputs, RTC backup, and secure data storage. Use Value: 96-bit unique ID enables cryptographic binding of meter hardware to utility backend for anti-tampering. |
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 20-pin TSSOP/UFQFPN; 8 Kbytes Flash, 1 Kbyte RAM, no TIM1 advanced timer. | Lacks complementary PWM outputs and dead-time insertion; unsuitable for motor control. | Select when board space is constrained and advanced timer features are unnecessary. |
| STM8L051F3P6 | Ultra-low-power variant (1.65–3.6 V), 8 Kbytes Flash, but only 1 Kbyte RAM and no 16 MHz HSI; uses different clock architecture. | Optimized for sub-µA sleep; lacks high-speed UART/SPI clock output and full ADC channel count. | Choose for battery-powered devices requiring <0.5 µA deep-sleep current, accepting reduced peripheral bandwidth. |
Compared with STM8S903K3T6C, STM8S003F3P6 trades package size and cost for missing TIM1 motor-control features, while STM8L051F3P6 prioritizes sub-µA sleep over 16 MHz performance and mixed-signal flexibility.
Availability
STM8S903K3T6C is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC actuators, programmable power supply monitors, and embedded smart meter subsystems requiring stable component supply and long-term production support.
Supply support for STM8S903K3T6C 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 ICs, sensors, and analog products for industrial, automotive, and consumer markets.
The STM8S series targets cost-sensitive, robust 8-bit control applications in industrial automation and appliance control, emphasizing low-power operation, integrated EEPROM, and single-wire debug simplicity.
FAQ
What is the maximum operating frequency and voltage range for STM8S903K3T6C?
The STM8S903K3T6C operates at up to 16 MHz across a supply voltage range of 2.95 V to 5.5 V. Its internal 16 MHz RC oscillator is user-trimmable, and the maximum CPU frequency scales linearly with VDD per Figure 10 in DS6210 Rev 13. No external PLL is required to achieve full speed.
Does STM8S903K3T6C support in-system programming via SWIM?
Yes, the STM8S903K3T6C supports full in-system programming and debugging through its Single Wire Interface Module (SWIM) using only the SWIM pin and ground. This enables firmware updates without removing the MCU from the PCB, and is compatible with ST-LINK/V2 and ST-LINK/V2-1 debuggers.
How many I/O pins support high-sink capability, and what is the rating?
21 I/O pins (specifically PB0–PB7, PC0–PC7, and PA0–PA6) support high-sink capability rated at 100 mA total per port and 100 mA peak per pin under specified thermal conditions. This allows direct driving of LEDs, small relays, or logic-level MOSFET gates without external drivers.
Is there hardware support for motor control applications?
Yes, the integrated TIM1 advanced control timer provides 16-bit resolution, 4 capture/compare channels, 3 complementary outputs with programmable dead-time insertion, and flexible synchronization - enabling precise 3-phase BLDC or stepper motor control without external gate drivers or timing ICs.
STM8S903K3T6C 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 7x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8S903K3T6C FAQ
1.How can I place an order for STM8S903K3T6C through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8S903K3T6C 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 STM8S903K3T6C reliable?
The price and inventory of STM8S903K3T6C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8S903K3T6C is usually 5 days.
3.What payment methods are accepted for STM8S903K3T6C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8S903K3T6C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8S903K3T6C?
STM8S903K3T6C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8S903K3T6C 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 STM8S903K3T6C?
For technical support, including STM8S903K3T6C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8S903K3T6C requirements.
6.How does Aetrix verify that STM8S903K3T6C is sourced from the original manufacturer or authorized distributors?
All STM8S903K3T6C 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 STM8S903K3T6C meets industry standards.
7.What is the process for return or replacement of STM8S903K3T6C?
All STM8S903K3T6C units undergo pre-shipment inspection (PSI). If there is an issue with STM8S903K3T6C, 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 STM8S903K3T6C part is unused and in its original packaging.
Return procedure for STM8S903K3T6C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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