STM8AF5268TCY - 8-bit Automotive MCU, 32KB Flash, LQFP64 | STMicroelectronics
MPN: STM8AF5268TCY β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.32 | $4.32 |
| 10 | $3.89 | $38.90 |
| 100 | $3.46 | $346.00 |
| 500 | $3.11 | $1,555.00 |
| 1,000 | $2.77 | $2,770.00 |
Drop-in alternatives for STM8AF5268TCY 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:
STM8AF5288TCY
β Drop-Inβ 99,999 In Stock
$1.85 / Unit
View Datasheet βS9S08DN32
β‘ Same Packageπ Reference alternative (not in catalog)
R5F100LEA
β‘ Same Packageπ Reference alternative (not in catalog)
STM8AF5268TCY Maximum Ratings & Electrical Characteristics
| Core | STM8A 8-bit |
| Maximum Frequency | 24 MHz |
| Flash Memory | 32 KB |
| RAM | 2 KB |
| EEPROM | 1 KB |
| Supply Voltage | 3.0 V to 5.5 V |
| Package | LQFP-64 (10x10 mm) |
| Operating Temperature | -40Β°C to +150Β°C |
| ADC | 10-bit, 16 channels |
| Timers | Multiple 16-bit timers |
| UART | 2 |
| SPI | 2 |
| I2C | 2 |
| CAN | 2.0B |
| AEC-Q100 | Grade 1 |
| RoHS | Compliant |
STM8AF5268TCY Pin Configuration
| Pin 1 | VDD β Digital power supply |
| Pin 2 | VSS β Digital ground |
| 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 | VDDA β Analog power supply |
| Pin 9 | VSSA β Analog ground |
| Pin 10 | PB0 β General purpose I/O / SPI |
| Pin 11 | PB1 β General purpose I/O / SPI |
| Pin 12 | PB2 β General purpose I/O / SPI |
| Pin 13 | PB3 β General purpose I/O / SPI |
| Pin 14 | PB4 β General purpose I/O / I2C |
| Pin 15 | PB5 β General purpose I/O / I2C |
| Pin 16 | PB6 β General purpose I/O / UART |
| Pin 17 | PB7 β General purpose I/O / UART |
| Pin 18 | PC0 β General purpose I/O / ADC |
| Pin 19 | PC1 β General purpose I/O / ADC |
| Pin 20 | PC2 β General purpose I/O / ADC |
| Pin 21 | PC3 β General purpose I/O / ADC |
| Pin 22 | PC4 β General purpose I/O / ADC |
| Pin 23 | PC5 β General purpose I/O / ADC |
| Pin 24 | PC6 β General purpose I/O / ADC |
| Pin 25 | PC7 β General purpose I/O / ADC |
| Pin 26 | PD0 β General purpose I/O / CAN |
| Pin 27 | PD1 β General purpose I/O / CAN |
| Pin 28 | PD2 β General purpose I/O / UART |
| Pin 29 | PD3 β General purpose I/O / UART |
| Pin 30 | PD4 β General purpose I/O / SPI |
| Pin 31 | PD5 β General purpose I/O / SPI |
| Pin 32 | PD6 β General purpose I/O / SPI |
| Pin 33 | PD7 β General purpose I/O / SPI |
| Pin 34 | PE0 β General purpose I/O / timer |
| Pin 35 | PE1 β General purpose I/O / timer |
| Pin 36 | PE2 β General purpose I/O / timer |
| Pin 37 | PE3 β General purpose I/O / timer |
| Pin 38 | PE4 β General purpose I/O / timer |
| Pin 39 | PE5 β General purpose I/O / timer |
| Pin 40 | PE6 β General purpose I/O / timer |
| Pin 41 | PE7 β General purpose I/O / timer |
| Pin 42 | PF0 β General purpose I/O / ADC |
| Pin 43 | PF1 β General purpose I/O / ADC |
| Pin 44 | PF2 β General purpose I/O / ADC |
| Pin 45 | PF3 β General purpose I/O / ADC |
| Pin 46 | PF4 β General purpose I/O / ADC |
| Pin 47 | PF5 β General purpose I/O / ADC |
| Pin 48 | PF6 β General purpose I/O / ADC |
| Pin 49 | PF7 β General purpose I/O / ADC |
| Pin 50 | VDD β Digital power supply |
| Pin 51 | VSS β Digital ground |
| Pin 52 | PG0 β General purpose I/O / timer |
| Pin 53 | PG1 β General purpose I/O / timer |
| Pin 54 | PG2 β General purpose I/O / timer |
| Pin 55 | PG3 β General purpose I/O / timer |
| Pin 56 | PG4 β General purpose I/O / timer |
| Pin 57 | PG5 β General purpose I/O / timer |
| Pin 58 | PG6 β General purpose I/O / timer |
| Pin 59 | PG7 β General purpose I/O / timer |
| Pin 60 | OSC_IN β External oscillator input |
| Pin 61 | OSC_OUT β External oscillator output |
| Pin 62 | VDD β Digital power supply |
| Pin 63 | VSS β Digital ground |
| Pin 64 | VDD β Digital power supply |
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
STM8AF5268TCY is suitable for 6 applications: Body Control Module (BCM), Engine Control Unit (ECU), HVAC Control, Lighting Control, Seat Control Module, Battery Management System (BMS).
Body Control Module (BCM)
The STM8AF5268TCY is ideal for body control modules due to its CAN 2.0B interface, multiple timers, and wide operating temperature range. It manages lighting, door locks, and window motors, communicating over the vehicle CAN bus. The 32KB Flash is sufficient for BCM firmware, and the low-power modes help meet quiescent current requirements. The 10-bit ADC reads analog sensors for ambient light and temperature, while the timers generate PWM for dimming and motor control. Its AEC-Q100 Grade 1 rating ensures reliable operation in the passenger compartment, where temperatures can reach 85Β°C. The device's robust ESD protection and EMI tolerance make it suitable for the noisy automotive environment.
Recommended
Engine Control Unit (ECU)
In engine management, the STM8AF5268TCY handles sensor acquisition and actuator control. Its 10-bit ADC with 16 channels reads manifold pressure, temperature, and throttle position. The 16-bit timers generate precise PWM signals for fuel injectors and ignition coils. The CAN interface allows communication with other ECUs for coordinated engine control. The device's high temperature rating (-40Β°C to +150Β°C) is critical for under-hood placement. The 32KB Flash stores calibration tables and control algorithms, while the EEPROM retains fault codes and adaptive learning data. The internal RC oscillator provides a cost-effective clock source, though an external crystal can be used for tighter timing.
Recommended
HVAC Control
The STM8AF5268TCY is well-suited for HVAC (heating, ventilation, and air conditioning) control systems. It reads temperature sensors via the ADC and controls blower motors and damper actuators using PWM outputs. The I2C interface connects to external temperature sensors and EEPROM for storing user settings. The UART allows communication with a central display unit. The device's low-power modes are beneficial for maintaining settings when the ignition is off. The 32KB Flash is ample for HVAC control algorithms, and the CAN interface enables integration with the vehicle's climate control network. The wide supply voltage range (3.0V-5.5V) accommodates both 5V and 3.3V logic.
Recommended
Lighting Control
For automotive lighting control, the STM8AF5268TCY provides PWM outputs for LED dimming and control of exterior lights. Its timers generate high-frequency PWM to avoid visible flicker. The CAN interface allows communication with the body control module for light commands. The ADC monitors current sense resistors for fault detection. The device's automotive qualification ensures reliable operation in extreme temperatures. The 32KB Flash stores lighting patterns and diagnostic routines. The low-power modes help reduce battery drain when lights are off. The device can also control adaptive headlights by reading steering angle sensors and adjusting the beam pattern.
Recommended
Seat Control Module
The STM8AF5268TCY is used in seat control modules to manage motorized seat adjustments. It reads switch inputs via GPIO and controls DC motors using PWM and H-bridge drivers. The ADC monitors current to detect obstructions and prevent damage. The CAN interface allows synchronization with memory seat functions. The device's timers generate precise PWM for smooth motor speed control. The 32KB Flash stores seat position profiles and diagnostic data. The EEPROM retains seat settings across power cycles. The wide temperature range and robust I/O make it suitable for the harsh automotive environment.
Recommended
Battery Management System (BMS)
In battery management systems, the STM8AF5268TCY monitors cell voltages and temperatures using its 10-bit ADC. It controls balancing circuits and communicates with the main controller via CAN. The device's low-power modes are essential for minimizing battery drain when the vehicle is off. The 32KB Flash stores battery state-of-charge algorithms, while the EEPROM retains historical data. The wide supply voltage range allows direct connection to the battery pack (e.g., 12V system with a regulator). The AEC-Q100 Grade 1 rating ensures operation in the battery compartment, which can experience high temperatures.
Recommended
Recommended Products Summary
Engineering reference data for STM8AF5268TCY β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM8AF5288TCY | STM8AF5268TAY | STM8AF5268UCY | S9S08DN32 | R5F100LEA |
|---|---|---|---|---|---|---|
| Package | LQFP-64 | LQFP-64 (same) | LQFP-48 (different) | UFQFPN-32 (different) | LQFP-64 (same) | LQFP-64 (same) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | NXP Semiconductors | Renesas Electronics |
| Core | STM8A 8-bit | STM8A 8-bit | STM8A 8-bit | STM8A 8-bit | S08 8-bit | RL78 16-bit |
| Flash Memory | 32 KB | 64 KB | 32 KB | 32 KB | 32 KB | 64 KB |
| RAM | 2 KB | 6 KB | 2 KB | 2 KB | 2 KB | 4 KB |
| Max Frequency | 24 MHz | 24 MHz | 24 MHz | 24 MHz | 20 MHz | 32 MHz |
| ADC | 10-bit, 16 ch | 10-bit, 16 ch | 10-bit, 10 ch | 10-bit, 10 ch | 12-bit, 16 ch | 10-bit, 20 ch |
| CAN | 2.0B | 2.0B | 2.0B | 2.0B | None | None |
Key Differentiators
- Integrated CAN 2.0B controller (vs S9S08DN32)
- AEC-Q100 Grade 1 qualification (vs R5F100LEA)
- Wide supply voltage range (3.0V-5.5V) (vs S9S08DN32)
Design Notes
Decouple the VDD and VDDA pins with 100nF ceramic capacitors placed as close to the pins as possible. Additionally, use a 4.7uF bulk capacitor on the main supply. The VDDA pin should be connected to the same supply as VDD through a ferrite bead to reduce noise coupling into the ADC.
For the LQFP-64 package, ensure proper solder paste stencil design to avoid bridging. Use a 0.5mm pitch land pattern with adequate thermal relief for the exposed pad (if present). Route high-speed signals (SPI, CAN) with controlled impedance and keep them away from the crystal oscillator pins.
Do not leave unused I/O pins floating; configure them as outputs or enable internal pull-ups. The NRST pin requires a 100nF capacitor to ground for reliable reset. When using the internal RC oscillator, note that it is calibrated to Β±1% at 25Β°C, but may drift with temperature; for CAN communication, an external crystal is recommended for timing accuracy.
Compliance Information
AEC-Q100 Grade 1 qualified. RoHS and REACH compliant per STMicroelectronics product page.
