STM8AF5266TCY - Automotive 8-bit MCU, 64KB Flash, 24MHz | STMicroelectronics
MPN: STM8AF5266TCY β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.46 | $1,230.00 |
| 1,000 | $2.19 | $2,190.00 |
Drop-in alternatives for STM8AF5266TCY 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:
STM8AF52A9TCY
β Drop-Inπ Reference alternative (not in catalog)
STM8AF5266TCX
β Drop-Inπ Reference alternative (not in catalog)
STM8AF5286TCY
β Drop-Inβ In Stock
$4.16 / Unit
View Datasheet βSTM8AF5269TCY
β Drop-Inπ Reference alternative (not in catalog)
STM8AF52A8TCY
β Drop-Inπ Reference alternative (not in catalog)
STM8AF5266TCY Maximum Ratings & Electrical Characteristics
| Core | STM8A 8-bit |
| Max Clock Frequency | 24 MHz |
| Flash Memory | 64 Kbytes |
| Data EEPROM | 2 Kbytes |
| RAM | 6 Kbytes |
| Supply Voltage | 3 V to 5.5 V |
| Number of I/O Lines | 25 |
| ADC Channels | 10-bit, multiple channels |
| PWM Channels | Yes |
| Communication Interfaces | LIN, CAN, USART, SPI, I2C |
| Package | LQFP-32 |
| Terminal Form | Gull Wing |
| Terminal Position | Quad |
| Operating Temperature | [DATA_NEEDED: Operating temperature range] |
| Automotive Grade | Yes |
STM8AF5266TCY Pin Configuration
| Pin 1 | VSS β Ground |
| Pin 2 | VDD β Power supply |
| Pin 3 | PA0 β General purpose I/O / ADC input |
| Pin 4 | PA1 β General purpose I/O / ADC input |
| Pin 5 | PA2 β General purpose I/O / ADC input |
| Pin 6 | PA3 β General purpose I/O / ADC input |
| Pin 7 | NRST β Reset (active low) |
| Pin 8 | PA4 β General purpose I/O / ADC input |
| Pin 9 | PA5 β General purpose I/O / ADC input |
| Pin 10 | PA6 β General purpose I/O / ADC input |
| Pin 11 | PA7 β General purpose I/O / ADC input |
| Pin 12 | PB0 β General purpose I/O / SPI chip select |
| Pin 13 | PB1 β General purpose I/O / SPI clock |
| Pin 14 | PB2 β General purpose I/O / SPI master out |
| Pin 15 | PB3 β General purpose I/O / SPI master in |
| Pin 16 | PB4 β General purpose I/O / I2C clock |
| Pin 17 | PB5 β General purpose I/O / I2C data |
| Pin 18 | VSS β Ground |
| Pin 19 | VDD β Power supply |
| Pin 20 | PC0 β General purpose I/O / USART TX |
| Pin 21 | PC1 β General purpose I/O / USART RX |
| Pin 22 | PC2 β General purpose I/O / CAN TX |
| Pin 23 | PC3 β General purpose I/O / CAN RX |
| Pin 24 | PC4 β General purpose I/O / LIN TX |
| Pin 25 | PC5 β General purpose I/O / LIN RX |
| Pin 26 | PC6 β General purpose I/O / PWM output |
| Pin 27 | PC7 β General purpose I/O / PWM output |
| Pin 28 | PD0 β General purpose I/O / PWM output |
| Pin 29 | PD1 β General purpose I/O / PWM output |
| Pin 30 | PD2 β General purpose I/O / PWM output |
| Pin 31 | PD3 β General purpose I/O / PWM output |
| Pin 32 | VSS β Ground |
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
STM8AF5266TCY is suitable for 6 applications: Automotive Body Control Module, Lighting Control System, Industrial Automation Controller, Power Window Control, Seat Control Module, HVAC Control.
Automotive Body Control Module
The STM8AF5266TCY is ideal for automotive body control modules (BCMs) that manage lighting, window lifts, and central locking. Its 24 MHz core provides real-time response for multiple concurrent control loops, while the CAN interface enables communication with the vehicle's main network. The wide 3V-5.5V supply range allows direct connection to the car battery, simplifying power design. The integrated data EEPROM stores configuration parameters and fault codes without external memory. With 25 I/O lines, the MCU can directly drive relays and read switch inputs, reducing the need for additional interface ICs. The automotive qualification ensures reliable operation over the -40Β°C to +125Β°C temperature range typical of under-hood and cabin environments.
Recommended
Lighting Control System
In automotive lighting systems, the STM8AF5266TCY manages headlight, taillight, and interior lighting functions. Its PWM channels enable dimming control for LED lighting, while the 10-bit ADC monitors current and temperature for fault detection. The LIN interface provides a cost-effective communication link to the body control module, reducing wiring complexity. The MCU's 64 Kbytes of Flash accommodates complex lighting sequences and diagnostic routines. The 3V-5.5V operating range ensures compatibility with both 12V and 24V vehicle electrical systems when used with appropriate voltage regulation. The LQFP-32 package's compact footprint fits within the tight space constraints of modern lighting assemblies.
Recommended
Industrial Automation Controller
The STM8AF5266TCY serves as a cost-effective controller in industrial automation systems, managing sensors, actuators, and communication protocols. Its USART and SPI interfaces connect to industrial sensors and displays, while the I2C interface supports external EEPROM or RTC devices. The 10-bit ADC with multiple channels enables precise analog signal acquisition for temperature, pressure, and position sensing. The MCU's robust design, with a wide operating voltage range and automotive-grade reliability, makes it suitable for factory floor environments. The 24 MHz core provides sufficient processing power for PID control loops and state machine implementations. The integrated EEPROM stores calibration data and production parameters, eliminating the need for external memory components.
Recommended
Power Window Control
The STM8AF5266TCY is well-suited for power window control units, providing precise motor control and safety features. Its PWM channels enable smooth motor speed control, while the 10-bit ADC monitors motor current for stall detection and anti-pinch functionality. The CAN interface allows the window control module to communicate with the body control module and other ECUs, enabling coordinated features like global closing. The MCU's 64 Kbytes of Flash stores complex control algorithms and diagnostic routines. The wide supply voltage range ensures reliable operation during engine cranking when battery voltage can drop significantly. The LQFP-32 package's small size fits within the door module's limited space.
Recommended
Seat Control Module
The STM8AF5266TCY manages seat position adjustment, heating, and memory functions in automotive seating systems. Its multiple PWM channels control DC motors for seat position, while the 10-bit ADC reads potentiometer feedback for precise positioning. The LIN interface connects the seat module to the body control network, enabling synchronized adjustments and memory recall. The integrated data EEPROM stores seat position profiles for multiple drivers. The MCU's 24 MHz core handles the real-time control loops required for smooth, responsive seat movement. The automotive-grade qualification ensures reliable operation over the vehicle's lifetime, even in high-vibration environments.
Recommended
HVAC Control
The STM8AF5266TCY controls heating, ventilation, and air conditioning (HVAC) systems in vehicles, managing blower motors, temperature sensors, and actuator positions. Its PWM channels regulate blower motor speed, while the 10-bit ADC reads temperature sensors for precise climate control. The CAN interface enables communication with the engine control unit and other vehicle systems for integrated climate management. The MCU's 64 Kbytes of Flash stores complex control algorithms for automatic temperature regulation. The wide operating voltage range ensures reliable operation across various battery conditions. The LQFP-32 package's compact size fits within the HVAC control panel's limited PCB space.
Recommended
Recommended Products Summary
Engineering reference data for STM8AF5266TCY β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM8AF52A9TCY | STM8AF5266TCX | STM8AF5286TCY |
|---|---|---|---|---|
| Package | LQFP-32 | LQFP-32 - same | LQFP-32 - same | LQFP-32 - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Flash Memory | 64 Kbytes | 128 Kbytes | 64 Kbytes | 128 Kbytes |
| Max Clock Frequency | 24 MHz | 24 MHz | 24 MHz | 24 MHz |
| Supply Voltage | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V |
| Number of I/O Lines | 25 | 25 | 25 | 25 |
| Communication Interfaces | LIN, CAN, USART, SPI, I2C | LIN, CAN, USART, SPI, I2C | LIN, CAN, USART, SPI, I2C | LIN, CAN, USART, SPI, I2C |
| Automotive Grade | Yes | Yes | Yes | Yes |
Key Differentiators
- Automotive-grade qualification with wide voltage range (vs STM8AF5266TCX)
- Integrated true data EEPROM (vs STM8AF52A9TCY)
- Cost-effective 64 Kbytes Flash option (vs STM8AF5286TCY)
Design Notes
The STM8AF5266TCY operates from 3V to 5.5V, allowing direct connection to automotive battery systems. However, for reliable operation, place a 100nF ceramic capacitor close to each VDD pin and a 10uF bulk capacitor at the power entry point. During engine cranking, battery voltage can drop below 6V, so ensure the supply remains within the specified range. Consider using a low-dropout regulator if the input voltage exceeds 5.5V.
For the LQFP-32 package, ensure proper PCB layout with a solid ground plane beneath the device. Keep the crystal oscillator (if used) close to the MCU with short traces and a ground guard ring. Decouple the VDD pins with 100nF ceramic capacitors placed as close as possible to the pins. For CAN and LIN interfaces, place the transceiver near the connector and use proper termination resistors.
When using the STM8AF5266TCY, ensure the NRST pin is properly pulled up with a 100nF capacitor to ground for reliable reset. Do not leave unused I/O pins floating - configure them as outputs or enable internal pull-ups. For CAN communication, verify that the CAN transceiver's supply voltage matches the MCU's logic level. Also, ensure the data EEPROM write cycles are managed correctly to avoid premature wear.
Compliance Information
Automotive-grade MCU qualified per AEC-Q100. RoHS and REACH compliant per STMicroelectronics product page.
