STM8S105K4T6 - 8-bit MCU, 16KB Flash, 16MHz | STMicroelectronics
MPN: STM8S105K4T6 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.5 | $2.50 |
| 10 | $2.25 | $22.50 |
| 100 | $2 | $200.00 |
| 500 | $1.8 | $900.00 |
| 1,000 | $1.65 | $1,650.00 |
Drop-in alternatives for STM8S105K4T6 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:
STM8S105K6T6
β Drop-Inπ Reference alternative (not in catalog)
STM8S105K4T6C
β Drop-Inπ Reference alternative (not in catalog)
STM8S105K4T6CTR
β Drop-Inπ Reference alternative (not in catalog)
STM8S105K4T3
β Drop-Inπ Reference alternative (not in catalog)
STM8S105K4T6 Maximum Ratings & Electrical Characteristics
| Core | STM8 |
| Architecture | 8-bit CISC |
| Maximum Clock Frequency | 16 MHz |
| Flash Program Memory | 16 KB (16K x 8) |
| Data EEPROM | 1 KB |
| RAM | 2 KB |
| Supply Voltage Range | 2.95 V to 5.5 V |
| ADC Resolution | 10-bit |
| ADC Channels | 7 |
| Timer Count | 4 (1x 16-bit advanced, 2x 16-bit general purpose, 1x 8-bit basic) |
| Communication Interfaces | UART, SPI, I2C |
| Package | LQFP-32 |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40Β°C to +85Β°C |
| RoHS Status | Compliant |
STM8S105K4T6 Pin Configuration
| Pin 1 | PD0 β Port D0 / SPI NSS / I2C SCL |
| Pin 2 | PD1 β Port D1 / SPI SCK / I2C SDA |
| Pin 3 | PD2 β Port D2 / SPI MOSI |
| Pin 4 | PD3 β Port D3 / SPI MISO |
| Pin 5 | PD4 β Port D4 / UART TX |
| Pin 6 | PD5 β Port D5 / UART RX |
| Pin 7 | PD6 β Port D6 / TIM1_CH1 |
| Pin 8 | PD7 β Port D7 / TIM1_CH2 |
| Pin 9 | VSS β Ground |
| Pin 10 | VDD β Power supply (2.95V to 5.5V) |
| Pin 11 | PA0 β Port A0 / ADC_IN0 |
| Pin 12 | PA1 β Port A1 / ADC_IN1 |
| Pin 13 | PA2 β Port A2 / ADC_IN2 |
| Pin 14 | PA3 β Port A3 / ADC_IN3 |
| Pin 15 | PA4 β Port A4 / ADC_IN4 |
| Pin 16 | PA5 β Port A5 / ADC_IN5 |
| Pin 17 | PA6 β Port A6 / ADC_IN6 |
| Pin 18 | PA7 β Port A7 / TIM1_CH3 |
| Pin 19 | PB0 β Port B0 / TIM1_CH1N |
| Pin 20 | PB1 β Port B1 / TIM1_CH2N |
| Pin 21 | PB2 β Port B2 / TIM1_CH3N |
| Pin 22 | PB3 β Port B3 / TIM2_CH1 |
| Pin 23 | PB4 β Port B4 / TIM2_CH2 |
| Pin 24 | PB5 β Port B5 / TIM2_CH3 |
| Pin 25 | PB6 β Port B6 / TIM2_CH4 |
| Pin 26 | PB7 β Port B7 / TIM3_CH1 |
| Pin 27 | PC0 β Port C0 / TIM3_CH2 |
| Pin 28 | PC1 β Port C1 / TIM3_CH3 |
| Pin 29 | PC2 β Port C2 / TIM3_CH4 |
| Pin 30 | PC3 β Port C3 / SWIM |
| Pin 31 | PC4 β Port C4 / NRST |
| Pin 32 | PC5 β Port C5 / OSC_IN |
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
STM8S105K4T6 is suitable for 6 applications: Industrial Control, Home Appliances, Sensor Interfaces, Motor Control, Consumer Electronics, Automotive (Aftermarket).
Industrial Control
The STM8S105K4T6 is well-suited for industrial control applications such as PLCs, motor control, and process automation. Its 16 MHz core and rich peripheral set enable real-time control loops, while the integrated EEPROM stores calibration data and parameters without external memory. The wide operating voltage range (2.95V to 5.5V) and industrial temperature grade (-40Β°C to +85Β°C) ensure reliable operation in harsh factory environments. The 10-bit ADC with 7 channels can interface with sensors for temperature, pressure, and position feedback. Communication interfaces like UART and SPI allow connection to industrial networks (e.g., Modbus) and human-machine interfaces (HMIs). The device's robust design, including a watchdog timer and brown-out reset, enhances system reliability. For motor control, the advanced control timer provides PWM outputs with dead-time insertion, enabling efficient and safe motor driving. Overall, the STM8S105K4T6 offers a cost-effective solution for industrial control systems requiring moderate processing power and extensive I/O.
Recommended
Home Appliances
The STM8S105K4T6 is ideal for home appliances such as washing machines, refrigerators, and microwave ovens. Its low cost and integrated peripherals reduce BOM complexity, while the 16 KB Flash provides ample space for application firmware. The device's multiple timers can generate precise timing for motor control, user interface scanning, and communication with display modules. The 10-bit ADC reads temperature sensors and user potentiometers, enabling adaptive control algorithms. The I2C interface connects to external EEPROMs or real-time clocks for scheduling features. The STM8S105K4T6's low-power modes, including Halt and Active-halt, help meet energy efficiency standards by reducing standby consumption. Its robust ESD protection and wide voltage range ensure reliable operation in household environments. The integrated EEPROM stores user settings and fault logs, enhancing user experience and serviceability. With its rich feature set and cost-effectiveness, the STM8S105K4T6 is a popular choice for smart home appliances.
Recommended
Sensor Interfaces
The STM8S105K4T6 excels as a sensor interface hub, aggregating data from multiple sensors and transmitting it to a central controller. Its 10-bit ADC with 7 channels can directly read analog sensors such as thermistors, photodiodes, and strain gauges. The I2C and SPI interfaces allow connection to digital sensors like accelerometers, gyroscopes, and temperature sensors (e.g., STTS751). The UART interface enables communication with GPS modules or wireless transceivers for remote monitoring. The device's 16 MHz core can handle sensor fusion algorithms, while the integrated EEPROM stores calibration coefficients and sensor IDs. The low-power modes are crucial for battery-powered sensor nodes, extending operational life. The STM8S105K4T6's small LQFP-32 package fits compact sensor modules, and its wide voltage range accommodates various power sources. With its rich analog and digital interfaces, the STM8S105K4T6 simplifies sensor system design and reduces component count.
Recommended
Motor Control
The STM8S105K4T6 is designed for motor control applications, including brushless DC (BLDC) motors, brushed DC motors, and stepper motors. Its advanced control timer (TIM1) provides up to 6 PWM outputs with complementary signals and dead-time insertion, essential for driving H-bridges and three-phase inverters. The 10-bit ADC can sample motor currents and back-EMF for sensorless control algorithms. The device's 16 MHz core executes control loops with low latency, ensuring smooth motor operation. The UART interface allows communication with a host controller for speed and direction commands. The integrated EEPROM stores motor parameters and calibration data. The STM8S105K4T6's robust I/O structure can directly drive gate drivers or optocouplers, simplifying the interface. Its wide voltage range and industrial temperature grade make it suitable for various motor types and environments. For high-performance applications, the STM8S105K4T6 can be paired with dedicated motor drivers like the L6205 or L6230.
Recommended
Consumer Electronics
The STM8S105K4T6 is widely used in consumer electronics such as remote controls, toys, and small appliances. Its low cost and small footprint make it ideal for high-volume products. The device's multiple timers generate precise timing for user interface debouncing, LED blinking, and sound generation. The UART interface enables communication with Bluetooth modules for smart features. The 10-bit ADC reads battery voltage for low-battery indicators. The integrated EEPROM stores user preferences and device settings. The STM8S105K4T6's low-power modes extend battery life in portable devices. Its robust design ensures reliable operation in everyday use. With its rich feature set and ease of development, the STM8S105K4T6 accelerates time-to-market for consumer products.
Recommended
Automotive (Aftermarket)
The STM8S105K4T6 is suitable for aftermarket automotive applications such as car alarm systems, window lift controllers, and dashboard displays. Its wide operating voltage range (2.95V to 5.5V) and industrial temperature grade (-40Β°C to +85Β°C) ensure reliable operation in vehicle environments. The device's multiple timers generate PWM signals for LED dimming and motor control. The 10-bit ADC reads sensors for temperature, pressure, and position. The UART interface enables communication with GPS modules or OBD-II adapters. The integrated EEPROM stores vehicle-specific settings and fault codes. The STM8S105K4T6's robust I/O structure can directly interface with relays and solenoids. Its low-power modes help reduce battery drain when the vehicle is off. While not AEC-Q100 qualified, the STM8S105K4T6 is often used in aftermarket products where full automotive certification is not required.
Recommended
Recommended Products Summary
Engineering reference data for STM8S105K4T6 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM8S105K6T6 | STM8S105K4T6C | STM8S105K4T6CTR | STM8S105K4T3 |
|---|---|---|---|---|---|
| Package | LQFP-32 | LQFP-32 | LQFP-32 | LQFP-32 | LQFP-32 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Flash Memory | 16 KB | 32 KB | 16 KB | 16 KB | 16 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Operating Temperature Range | -40Β°C to +85Β°C | -40Β°C to +85Β°C | -40Β°C to +85Β°C | -40Β°C to +85Β°C | -40Β°C to +125Β°C |
| ADC Channels | 7 | 7 | 7 | 7 | 7 |
Key Differentiators
- Integrated true data EEPROM (vs STM8S105K6T6)
- Wide operating voltage range (2.95V to 5.5V) (vs STM8S105K4T3)
- Multiple communication interfaces (UART, SPI, I2C) (vs STM8S105K4T6C)
Design Notes
Ensure a stable power supply within the 2.95V to 5.5V range. Place a 100nF ceramic capacitor close to each VDD pin and a 4.7uF bulk capacitor on the main supply. The STM8S105K4T6 has separate analog and digital power pins; connect them properly to avoid noise coupling into the ADC.
For the LQFP-32 package, use a 4-layer PCB with a solid ground plane. Keep the SWIM pin (PC3) accessible for programming and debugging. Route high-speed signals (SPI, I2C) away from the crystal oscillator pins (PC5/PC6) to minimize interference. Add a 0.1uF decoupling capacitor on the NRST pin to prevent false resets.
Do not leave unused pins floating; configure them as outputs or enable internal pull-ups. The STM8S105K4T6 has an internal RC oscillator, but for accurate timing, use an external crystal. Ensure the SWIM interface is not disabled in firmware, as it is needed for programming. Also, be aware that the EEPROM has a limited write endurance (300k cycles), so implement wear leveling if writing frequently.
Compliance Information
RoHS compliant per STMicroelectronics. Not AEC-Q100 qualified; for automotive use, consider STM8S105K4T3 or other automotive-grade variants.
