STM8AF5286UCY

STMicroelectronics STM8AF5286UCY – Automotive 8‑bit MCU with 64 KB Flash, LIN/CAN, 24 MHz

The STMicroelectronics STM8AF5286UCY is an automotive‑grade 8‑bit microcontroller tailored for reliable body electronics and general automotive control. Part of the STM8AF52 family, this device combines a robust STM8 core running up to 24 MHz with integrated data EEPROM, 64 KB of Flash program memory, and native support for key in‑vehicle communication busses: LIN and CAN. If you need a dependable, cost‑effective controller for door, seat, lighting, HVAC, or actuator modules, the STM8AF5286UCY provides the essentials without unnecessary complexity.

This overview consolidates the information you need to evaluate and source the STM8AF5286UCY efficiently: a clear specification summary, lifecycle and compliance notes, application guidance, and actionable design‑in tips. Where details are not available in the provided data, we explicitly mark them as Not specified in datasheet so you can focus verification efforts where it matters.

Highlights and Value Proposition

• Automotive‑grade 8‑bit microcontroller from STMicroelectronics (STM8AF52 series)
• STM8 core up to 24 MHz for responsive control loops and deterministic timing
• 64 KB Flash program memory to accommodate robust application code and diagnostics
• Integrated data EEPROM for nonvolatile parameters, counters, and calibration (capacity not stated here)
• Built‑in support for LIN and CAN—two foundational in‑vehicle networks—reducing external components and software overhead
• Surface‑mount mounting for streamlined production and reliable automotive assembly
• Backed by STMicroelectronics’ automotive MCU lineage for long‑term supply confidence

Technical Overview

Core and Performance

• Core: STM8 8‑bit architecture
• Maximum CPU Frequency: 24 MHz

The STM8 core is designed for efficient 8‑bit computation and predictable interrupt latency—key attributes in automotive body electronics where tasks like motor/relay actuation, switch debouncing, LED dimming, and sensor interfacing benefit from deterministic behavior. Running at up to 24 MHz, the STM8AF5286UCY can comfortably execute state machines, diagnostics, and communication stacks for LIN and CAN‑based subsystems.

Memory Architecture

• Program Memory (Flash): 64 KB
• Data EEPROM: Integrated (capacity not specified in datasheet)

With 64 KB of Flash, engineers can implement feature‑rich application code, safety monitoring, and in‑field diagnostics without immediate pressure to optimize for code size. The presence of on‑chip data EEPROM is a practical advantage in automotive systems: you can persist configuration, VIN‑related data, calibration constants, counters (e.g., actuator cycles), and DTC‑like information without external EEPROM devices, simplifying the BOM and PCB layout.

Automotive Communications

• Automotive Interfaces: LIN, CAN

Native support for LIN and CAN makes the STM8AF5286UCY a solid fit for distributed automotive electronics. LIN provides a low‑cost, single‑wire bus suited to switches, lighting, and simple actuator networks, while CAN supports more bandwidth and robustness for modules that must interoperate across the vehicle. Integrating these interfaces reduces firmware and hardware effort compared with adding external transceivers and protocol handling to a generic MCU. Always consult the datasheet and reference designs for transceiver requirements and physical layer integration.

Packaging and I/O

• Mounting Type: Surface Mount
• Package / Pin Count: Not specified in datasheet

The STM8AF5286UCY is a surface‑mount device suited to automated assembly lines common in automotive electronics manufacturing. Specific package dimensions, pin count, and pinout details for the “UCY” ordering code are not included in the provided data. Refer to the latest STM8AF52/A family datasheet and product documentation to confirm mechanical footprint, pin mapping, and any package‑dependent features.

Specifications

• Manufacturer / Brand: STMicroelectronics
• MPN: STM8AF5286UCY
• Series: STM8AF52
• Category: Automotive 8‑bit Microcontroller
• Core: STM8
• Max CPU Frequency: 24 MHz
• Program Memory (Flash): 64 KB
• Data EEPROM: Integrated (capacity not specified in datasheet)
• Automotive Interfaces: LIN, CAN
• Mounting Type: Surface Mount
• Temperature Range: Not specified in datasheet
• Package / Case: Not specified in datasheet
• Pin Count: Not specified in datasheet
• RoHS / Environmental Status: Not specified in datasheet

Notes:

• For complete electrical characteristics, memory endurance/retention, and timing parameters, consult the STM8AF52/A family datasheet.
• The exact EEPROM size and grade details for the STM8AF5286UCY ordering code should be verified against the latest documentation.

Application Focus

The STM8AF5286UCY is optimized for cost‑sensitive, high‑reliability body electronics where deterministic timing and network connectivity are essential. Typical uses include:

• Automotive body electronics
• Door, seat, and window modules
• HVAC and climate control modules
• Interior and exterior lighting control, dashboards, and indicator modules
• Sensor and actuator control in distributed vehicle systems

Why choose STM8AF5286UCY for these applications?

• Deterministic 8‑bit control: The STM8 core offers predictable execution for time‑critical tasks such as PWM updates for motors or dimming, and interrupt‑driven event handling.
• Adequate code space: 64 KB Flash supports state machines, communication stacks, and diagnostic routines without heavy code size constraints for many body applications.
• Integrated data retention: On‑chip EEPROM simplifies storage of calibration data, personalization settings, and counters—no separate EEPROM IC required.
• Built‑in automotive networking: LIN and CAN compatibility align with common OEM network topologies, easing integration into existing vehicle architectures.

Example design scenarios

• Window or seat control: Use the STM8AF5286UCY for input processing (switches, position sensors), motor/relay control, anti‑pinch logic, and LIN/CAN communication back to a body control module.
• Lighting modules: Implement PWM dimming, fault detection, and thermal derating logic, while reporting status and diagnostics across LIN or CAN.
• HVAC flap actuators: Drive actuators and handle end‑stop calibration with EEPROM‑backed parameters, while communicating position and diagnostics to the domain controller.

Lifecycle, Supply, and Compliance

• Lifecycle Status: Active (per provided data)
• Manufacturer (OCM) Source: STMicroelectronics
• AEC‑Q100: Listed at the family level; refer to datasheet for specific grade and ordering code applicability
• Automotive Qualification: Marked as an automotive‑qualified device in the provided data
• RoHS / Environmental: Not specified in datasheet

Inventory and Availability

• Inventory Quantity: 0 (provided data)
• Availability: Not specified in datasheet

Sourcing guidance:

• For active automotive MCUs like the STM8AF5286UCY, confirm lead times and allocation status with authorized distributors or STMicroelectronics partners. If you require lifecycle assurance, request PCN/PDN monitoring and consider second‑source planning within the same STM8AF52 family when feasible.

Replacements and Alternates

• Direct Replacements: None listed in the provided data
• Family‑Level Options: If you need different memory sizing, package options, or peripheral mixes, consider other STM8AF52 family members. Validate feature parity, electrical compatibility, and software portability before substitution.

Design‑In and Sourcing Checklist

Use this checklist to accelerate evaluation and procurement of the STMicroelectronics STM8AF5286UCY:

• Confirm ordering code details (STM8AF5286UCY) against the latest ST datasheet for package, pin count, temperature grade, and any suffix‑specific options.
• Verify AEC‑Q100 grade requirements with your OEM or Tier‑1 standards and ensure the selected ordering code meets them.
• Validate memory needs: 64 KB Flash is specified; confirm data EEPROM capacity in the datasheet is sufficient for your nonvolatile storage plan.
• Map network requirements: Ensure your LIN/CAN topology and node timing budgets align with the device’s capabilities and your transceiver selection.
• Check electrical characteristics: Input thresholds, clocking sources, reset behavior, and watchdog configuration should be aligned with your EMC and functional safety goals.
• Review production constraints: Surface‑mount assembly parameters and reflow profiles must align with your manufacturing line; corroborate with the package specifications from the datasheet.
• Plan for firmware updates: Define in‑system programming or service update paths, leveraging on‑chip memory features while protecting calibration and identity data.

Frequently Asked Questions (FAQs)

Q: Does the STMicroelectronics STM8AF5286UCY support automotive communication busses?
A: Yes. According to the family features, STM8AF5286 devices support LIN and CAN interfaces.

Q: What is the maximum CPU clock frequency?
A: Up to 24 MHz per the STM8AF52/A family datasheet.

Q: Is on‑chip EEPROM available?
A: Yes, the STM8AF5286 integrates data EEPROM. Refer to the datasheet for the exact capacity.

Q: What package and pin count are available for STM8AF5286UCY?
A: Not specified in datasheet (based on the provided data). Check the latest datasheet for UCY‑specific package and pinout information.

Q: What is the operating temperature range or AEC‑Q100 grade?
A: Not specified in datasheet (in the provided data). Refer to the ST datasheet and ordering table for grade and temperature limits.

Q: Is the STM8AF5286UCY RoHS compliant?
A: Not specified in datasheet. Confirm RoHS/REACH status via ST’s product page or compliance documentation.

Q: Are there recommended direct replacements?
A: No direct replacements are listed in the provided data. Evaluate other STM8AF52 family members if you need different memory or packaging options.

Resources

• Datasheet (STM8AF52/A family): https://www.st.com/resource/en/datasheet/stm8af52a.pdf
• Product Page (STM8A family): https://www.st.com/en/automotive-microcontrollers/stm8a.html

When moving to production, always base your final design and procurement decisions on the most recent datasheet and official STMicroelectronics documentation.

Summary

The STMicroelectronics STM8AF5286UCY is a practical, automotive‑grade microcontroller for body electronics and related automotive control tasks. With an STM8 core at up to 24 MHz, 64 KB of Flash, integrated data EEPROM, and built‑in LIN and CAN interfaces, it hits the right balance of capability and simplicity for many distributed electronic modules. Lifecycle status is Active per the provided data, and the device is indicated as part of an automotive‑qualified family, though you should verify the specific AEC‑Q100 grade and package details in the latest datasheet.

For engineers, buyers, and sourcing managers, the guidance above should streamline evaluation and procurement: confirm ordering code details (STM8AF5286UCY), validate environmental and compliance requirements, and align memory and network needs with your application. By focusing on the essentials and calling out items marked Not specified in datasheet for further verification, you can confidently advance design and sourcing decisions around the STM8AF5286UCY.