STM8S105S6T6 - 8-bit MCU, 32KB Flash, 16MHz | STMicroelectronics
MPN: STM8S105S6T6 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.35 | $2.35 |
| 10 | $2.1 | $21.00 |
| 100 | $1.85 | $185.00 |
| 500 | $1.6 | $800.00 |
| 1,000 | $1.45 | $1,450.00 |
Drop-in alternatives for STM8S105S6T6 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
STM8S105S6T6C
β Drop-Inπ Reference alternative (not in catalog)
STM8S105S4T6
β Drop-Inπ Reference alternative (not in catalog)
STM8S105S6T6B
β Drop-Inπ Reference alternative (not in catalog)
N76E885AT20
β Drop-Inπ Reference alternative (not in catalog)
EFM8BB21F16G-A-QFN28
β Drop-Inπ Reference alternative (not in catalog)
STM8S105S6T6 Maximum Ratings & Electrical Characteristics
| Core | STM8 |
| Architecture | 8-bit CISC |
| Maximum Clock Frequency | 16 MHz |
| Flash Program Memory | 32 Kbytes |
| RAM | 2 Kbytes |
| EEPROM | 1 Kbyte (true data EEPROM) |
| Supply Voltage Range | 2.95 V to 5.5 V |
| ADC | 10-bit, up to 10 channels |
| Timers | Multiple 16-bit timers |
| UART | 1 |
| SPI | 1 |
| I2C | 1 |
| Package | LQFP-44 |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40Β°C to +85Β°C |
| RoHS Status | Compliant |
STM8S105S6T6 Pin Configuration
| Pin 1 | PD0 β GPIO / SPI NSS |
| Pin 2 | PD1 β GPIO / SPI SCK |
| Pin 3 | PD2 β GPIO / SPI MOSI |
| Pin 4 | PD3 β GPIO / SPI MISO |
| Pin 5 | PD4 β GPIO / UART TX |
| Pin 6 | PD5 β GPIO / UART RX |
| Pin 7 | PD6 β GPIO / I2C SCL |
| Pin 8 | PD7 β GPIO / I2C SDA |
| Pin 9 | VSS β Ground |
| Pin 10 | VDD β Power supply (3.3V or 5V) |
| Pin 11 | PA0 β GPIO / ADC input |
| Pin 12 | PA1 β GPIO / ADC input |
| Pin 13 | PA2 β GPIO / ADC input |
| Pin 14 | PA3 β GPIO / ADC input |
| Pin 15 | PA4 β GPIO / ADC input |
| Pin 16 | PA5 β GPIO / ADC input |
| Pin 17 | PA6 β GPIO / ADC input |
| Pin 18 | PA7 β GPIO / ADC input |
| Pin 19 | PB0 β GPIO / Timer input |
| Pin 20 | PB1 β GPIO / Timer input |
| Pin 21 | PB2 β GPIO / Timer input |
| Pin 22 | PB3 β GPIO / Timer input |
| Pin 23 | PB4 β GPIO / Timer input |
| Pin 24 | PB5 β GPIO / Timer input |
| Pin 25 | PB6 β GPIO / Timer input |
| Pin 26 | PB7 β GPIO / Timer input |
| Pin 27 | PC0 β GPIO / Timer output |
| Pin 28 | PC1 β GPIO / Timer output |
| Pin 29 | PC2 β GPIO / Timer output |
| Pin 30 | PC3 β GPIO / Timer output |
| Pin 31 | PC4 β GPIO / Timer output |
| Pin 32 | PC5 β GPIO / Timer output |
| Pin 33 | PC6 β GPIO / Timer output |
| Pin 34 | PC7 β GPIO / Timer output |
| Pin 35 | NRST β Reset (active low) |
| Pin 36 | VSS β Ground |
| Pin 37 | VDD β Power supply |
| Pin 38 | PE0 β GPIO / SWIM |
| Pin 39 | PE1 β GPIO |
| Pin 40 | PE2 β GPIO |
| Pin 41 | PE3 β GPIO |
| Pin 42 | PE4 β GPIO |
| Pin 43 | PE5 β GPIO |
| Pin 44 | PE6 β GPIO |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
STM8S105S6T6 is suitable for 6 applications: Home Appliances, Industrial Control, Consumer Electronics, Automotive Aftermarket, IoT and Smart Home, Power Tools.
Home Appliances
The STM8S105S6T6 is ideal for home appliances such as washing machines, air conditioners, and refrigerators. Its 16 MHz STM8 core provides sufficient processing power for motor control, sensor reading, and user interface management. The integrated EEPROM stores calibration data and user settings, while the 10-bit ADC reads temperature and pressure sensors. The UART and I2C interfaces enable communication with display modules and other peripherals. The wide operating voltage range (2.95V to 5.5V) allows direct connection to 5V sensors and relays without level shifting. The low cost and high reliability make it a popular choice for high-volume consumer appliances.
Recommended
Industrial Control
In industrial control systems, the STM8S105S6T6 handles tasks such as motor control, process monitoring, and safety interlocks. Its multiple 16-bit timers generate precise PWM signals for motor speed control, while the 10-bit ADC samples analog sensors for temperature, pressure, and flow. The UART interface connects to industrial networks like RS-485 via external transceivers. The device's robust ESD protection and wide temperature range (-40Β°C to +85Β°C) ensure reliable operation in harsh factory environments. The integrated EEPROM stores configuration parameters and fault logs, reducing external component count. The STM8 core's deterministic execution is well-suited for real-time control loops.
Recommended
Consumer Electronics
The STM8S105S6T6 is widely used in consumer electronics like remote controls, power tools, and small appliances. Its low cost and small footprint (LQFP-44) make it ideal for space-constrained designs. The device's low-power modes (HALT and WAIT) extend battery life in portable devices. The SPI and I2C interfaces connect to displays, EEPROMs, and sensors. The 10-bit ADC reads battery voltage for fuel gauging. The integrated EEPROM stores user preferences and device settings. The STM8 core's efficient instruction set reduces code size, allowing more features in limited Flash memory.
Recommended
Automotive Aftermarket
While not AEC-Q100 qualified, the STM8S105S6T6 is used in automotive aftermarket products like car alarm systems, window controllers, and dashboard displays. Its 5V operation allows direct interfacing with automotive 12V systems via voltage regulators. The UART interface communicates with GPS modules and OBD-II adapters. The 10-bit ADC reads sensor inputs like temperature and light levels. The device's robust design withstands the vibration and temperature extremes found in vehicles. For production automotive applications, ST recommends the AEC-Q100 qualified STM8S105x4/6 variants.
Recommended
IoT and Smart Home
The STM8S105S6T6 serves as a cost-effective MCU for IoT edge nodes and smart home devices. Its low power consumption in HALT mode (typically a few microamps) enables battery-powered sensors. The UART or SPI interface connects to Wi-Fi or BLE modules for cloud connectivity. The 10-bit ADC reads environmental sensors like temperature, humidity, and light. The integrated EEPROM stores device credentials and sensor calibration. The small LQFP-44 package fits into compact smart home devices like thermostats, smart plugs, and security sensors. The STM8 core's simplicity reduces firmware development time.
Recommended
Power Tools
The STM8S105S6T6 is used in power tools like drills, saws, and grinders for motor control and safety features. Its 16 MHz core and 16-bit timers generate high-frequency PWM for brushless DC motor control. The 10-bit ADC monitors current and temperature for overload protection. The UART interface allows firmware updates via a programming tool. The device's wide voltage range (2.95V to 5.5V) accommodates battery packs from 3.6V to 5V. The robust design handles the vibration and shock typical of power tools. The integrated EEPROM stores tool settings and usage logs.
Recommended
Recommended Products Summary
Engineering reference data for STM8S105S6T6 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM8S105S6T6C | STM8S105S4T6 | N76E885AT20 |
|---|---|---|---|---|
| Package | LQFP-44 | LQFP-44 - same | LQFP-44 - same | LQFP-44 - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Nuvoton |
| Core | STM8 (8-bit CISC) | STM8 (8-bit CISC) | STM8 (8-bit CISC) | 8051 (8-bit CISC) |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Flash Memory | 32 KB | 32 KB | 16 KB | 18 KB |
| RAM | 2 KB | 2 KB | 2 KB | 1 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 4 KB |
| ADC | 10-bit, 10 channels | 10-bit, 10 channels | 10-bit, 10 channels | 12-bit, 8 channels |
| Supply Voltage Range | 2.95V to 5.5V | 2.95V to 5.5V | 2.95V to 5.5V | 2.4V to 5.5V |
Key Differentiators
- Integrated true data EEPROM (vs N76E885AT20)
- STM8 core with CISC architecture (vs N76E885AT20)
- Wide operating voltage range (vs EFM8BB21F16G-A-QFN28)
Design Notes
Decouple the VDD pins with a 100nF ceramic capacitor and a 10uF electrolytic capacitor placed as close to the pins as possible. The STM8S105S6T6 operates from 2.95V to 5.5V, so ensure the supply is stable and within this range. For noisy environments, add a ferrite bead in series with VDD to filter high-frequency noise.
For the LQFP-44 package, ensure proper solder paste stencil design to avoid bridging between pins. Use a 0.5mm pitch footprint with appropriate pad sizes. Place the crystal oscillator (if used) close to the OSC pins and keep the trace lengths short. Provide a solid ground plane under the MCU to reduce EMI.
Do not leave the NRST pin floating; connect it to VDD through a 100nF capacitor and a 10k ohm resistor to avoid spurious resets. The SWIM pin (PE0) is used for programming and debugging; ensure it is accessible on the PCB. When using the ADC, avoid routing high-speed digital traces near the analog input pins to prevent noise coupling.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified; for automotive use, select STM8S105x4/6 automotive variants.
