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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersSTM8AF52A8TAY
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STM8AF52A8TAY - STMicroelectronics

Manufacturer Part Number
STM8AF52A8TAY
Manufacturer
STMicroelectronics
Allelco Part Number
32D-STM8AF52A8TAY
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
11,438 pcs available, New & Original
Parts Description
IC MCU 8BIT 128KB FLASH 48LQFP
Package
48-LQFP (7x7)
Data sheet
STM8AF52A8TAY.pdf

PCN Packaging

2.73KHz.pdf

PCN Design/Specification

Cylindrical Battery Holders.pdf

PCN Obsolescence/ EOL

Cylindrical Battery Holders.pdf
RoHs Status
ROHS3 Compliant
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Specifications

STM8AF52A8TAY Tech Specifications
STMicroelectronics - STM8AF52A8TAY technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - STM8AF52A8TAY

Product Attribute Attribute Value
Manufacturer STMicroelectronics
Voltage - Supply (Vcc/Vdd) 3V ~ 5.5V
Supplier Device Package 48-LQFP (7x7)
Speed 24MHz
Series STM8A
RAM Size 6K x 8
Program Memory Type FLASH
Program Memory Size 128KB (128K x 8)
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Package / Case 48-LQFP
Package Tray
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Number of I/O 38
Mounting Type Surface Mount
EEPROM Size 2K x 8
Data Converters A/D 10x10b
Core Size 8-Bit
Core Processor STM8A
Connectivity CANbus, I²C, LINbus, SPI, UART/USART
Base Product Number STM8

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.31.0001

Parts Introduction

STM8AF52A8TAY Image
STM8AF52A8TAY (1)

Manufacturer Part Number

STM8AF52A8TAY

Manufacturer

STMicroelectronics

Introduction

The STM8AF52A8TAY, by STMicroelectronics, is an 8-bit microcontroller designed for automotive and industrial applications, offering robust performance and reliability.

Product Features and Performance

Core Processor: STM8A, 8-Bit

Speed: 24MHz, ensuring swift data processing

Connectivity options include CANbus, I2C, LINbus, SPI, UART/USART for versatile communications

Peripherals: Brown-out Detect/Reset, Power-on Reset (POR), Pulse Width Modulation (PWM), Watchdog Timer (WDT)

38 I/O Ports for extensive peripheral device connections

Program Memory Size: 128KB FLASH for ample program storage

EEPROM Size: 2KB for non-volatile data storage

RAM Size: 6KB for effective data manipulation

Integrated A/D Converters: 10 channels x 10 bits for analog signal processing

Internal Oscillator for reduced external component count

Operating Temperature: -40°C ~ 85°C, suitable for harsh environments

Product Advantages

High integration level reduces the need for additional components

Comprehensive connectivity supports varied communication protocols

Large memory capacity facilitates complex program execution

Low voltage operation (3V ~ 5.5V) enhances power efficiency

Surface Mount, 48-LQFP package allows for compact PCB designs

Key Technical Parameters

Core Size: 8-Bit

Speed: 24MHz

Voltage Supply (Vcc/Vdd): 3V ~ 5.5V

Data Converters: A/D 10x10b

Operating Temperature Range: -40°C ~ 85°C

Quality and Safety Features

Brown-out Detect/Reset and Power-on Reset for system stability

PWM, WDT peripherals ensure controlled operation and prevent system failures

Compatibility

The STM8AF52A8TAY's LQFP48 package is compatible with standard surface mount technology, facilitating integration into various designs.

Application Areas

Automotive control systems

Industrial automation

Home appliances

Consumer electronics

Product Lifecycle

Status: Not For New Designs (indicating it may be nearing the end of its production life, with potential limited availability; replacements or upgrades may be advised for new projects)

Several Key Reasons to Choose This Product

Robust performance features tailored for demanding environments

Comprehensive connectivity and peripheral set supports versatile application requirements

High memory capacity enables sophisticated program functionalities

Low power consumption ideal for energy-sensitive projects

STM8A core offers reliable and efficient processing capabilities for automotive and industrial applications

Frequently Asked Questions(FAQ)

What are the key differences between the STM8AF52A8TAY and other STM8 series microcontrollers in terms of program memory and peripheral integration?
The STM8AF52A8TAY distinguishes itself within the STM8 family by offering 128KB of embedded FLASH program memory, which is among the highest densities available for this architecture. This provides sufficient code space for complex control algorithms and application logic without requiring external memory components. Additionally, it integrates a comprehensive suite of communication peripherals including CANbus, I2C, LINbus, SPI, and UART/USART interfaces—features that are not universally present across all STM8 variants. While many STM8 devices offer similar core functionality, the combination of high-density FLASH, robust connectivity options, and integrated analog features like a 10-channel 10-bit ADC makes this device particularly suitable for automotive and industrial systems where both processing capacity and interface flexibility are critical.
How does the operating voltage range of the STM8AF52A8TAY impact its suitability for battery-powered or harsh environment applications?
Operating across a supply voltage range of 3V to 5.5V gives the STM8AF52A8TAY notable flexibility in power system design. This wide range allows compatibility with both standard 5V digital logic environments and lower-voltage systems, such as those powered by lithium-ion batteries or solar cells, reducing the need for additional voltage regulation stages. In battery-operated devices, the ability to operate efficiently at voltages near 3V extends operational life by minimizing current draw during low-power modes. Furthermore, the device maintains full functionality down to 3V, which is beneficial in automotive applications where load dump transients can temporarily reduce supply stability. This voltage tolerance, combined with built-in brown-out detection and power-on reset (POR) circuitry, enhances reliability in variable or noisy power environments.
Can the STM8AF52A8TAY be used in safety-critical systems that require fault monitoring, and what hardware support does it provide?
Yes, the STM8AF52A8TAY includes several hardware-level mechanisms designed to improve system robustness, making it suitable for applications where fault detection and recovery are essential. It features an internal watchdog timer (WDT), a power-on reset circuit, and brown-out detection (BOD), all of which help prevent erratic behavior due to software hangs, power glitches, or undervoltage conditions. These features enable automatic system recovery without external intervention, which is crucial in embedded control loops for motors, sensors, or communication networks. However, while these protections enhance resilience, they do not meet full ISO 26262 functional safety certification requirements on their own. For such standards, additional software diagnostics, redundancy, and architectural mitigations would still be necessary.
What trade-offs should engineers consider when selecting between the STM8AF52A8TAY and higher-end ARM Cortex-M microcontrollers for mid-complexity embedded tasks?
Choosing between the STM8AF52A8TAY and ARM-based MCUs involves balancing cost, performance, ecosystem support, and development resources. The STM8AF52A8TAY delivers solid performance at 24MHz with deterministic timing and low interrupt latency, ideal for real-time control loops and legacy protocol handling. It offers sufficient program memory (128KB FLASH) and RAM (6KB) for moderately complex state machines and sensor fusion algorithms. In contrast, ARM Cortex-M devices typically run at higher clock speeds and benefit from richer toolchains, more advanced debuggers, and extensive middleware support. The STM8AF52A8TAY may be preferred when minimizing BOM cost, leveraging proven 8-bit development workflows, or interfacing with existing 8-bit peripherals. However, if future scalability, floating-point computation, or complex RTOS usage is anticipated, transitioning to an ARM platform might be more sustainable despite higher power and pin count.
How does the package size and pinout of the STM8AF52A8TAY affect PCB layout decisions compared to larger QFP alternatives?
The 48-pin LQFP package in a compact 7x7 mm footprint allows the STM8AF52A8TAY to be deployed in space-constrained designs without increasing board dimensions significantly. Compared to wider packages like 64- or 100-pin QFPs, this smaller form factor reduces routing complexity and enables higher component density on double-sided PCBs. The 48-pin configuration supports all required functions—including 38 general-purpose I/Os, multiple communication interfaces, and analog inputs—without excessive unused pins. Engineers must still ensure proper decoupling placement near VDD pins and careful grounding of analog sections due to shared power domains. The small size also improves thermal dissipation slightly but demands attention to trace impedance and signal integrity, especially for high-speed signals like SPI or CAN at 500 kbps and above.
Is the STM8AF52A8TAY suitable for automotive-grade temperature cycling, and what environmental certifications apply?
The STM8AF52A8TAY is rated for industrial temperature operation from -40°C to +85°C, which aligns with typical automotive under-hood environments. While this covers most automotive use cases, full AEC-Q100 qualification is not explicitly stated in the base specifications, so customers should verify with STMicroelectronics whether specific automotive grades are supported through their quality management system. Regardless, the device complies with RoHS3 standards and has a Moisture Sensitivity Level of 3 (MSL 3), meaning it can withstand three reflow cycles under controlled JEDEC J-STD-020 conditions. For mass-production automotive applications, however, additional screening, traceability, and failure analysis may be required beyond standard commercial procurement practices.
What is the significance of the 10-bit ADC resolution and 10-channel input capability in the context of sensor interfacing with the STM8AF52A8TAY?
The integrated 10-bit successive approximation register (SAR) ADC with 10 multiplexed channels enables direct digitization of analog sensor signals such as thermistors, pressure transducers, or potentiometers without requiring external data converters. With a nominal conversion time around 1.5 µs per channel (assuming a 24MHz clock and standard configuration), it supports moderate sampling rates suitable for real-time feedback control. The ADC’s reference voltage can be tied to Vdd, allowing measurement relative to system supply, though noise immunity depends on clean analog ground and decoupling. While 10-bit resolution is adequate for many industrial and consumer applications, it lacks the precision needed for high-end instrumentation; nonetheless, it strikes a balance between accuracy, speed, and resource usage within the constraints of an 8-bit MCU.
How does the internal oscillator configuration of the STM8AF52A8TAY influence timing accuracy and system design choices?
The STM8AF52A8TAY uses an internal RC oscillator providing up to 16MHz, but the datasheet specifies a calibrated frequency of 24MHz under typical conditions—likely achieved through a multiplier or factory-trimmed calibration. This simplifies PCB design by eliminating external crystal requirements, reducing cost and footprint. However, the internal oscillator exhibits greater frequency drift over temperature (±2% typical) compared to crystal oscillators (±10 ppm). As a result, applications requiring precise timing—such as UART baud rate generation at high speeds or synchronous communication protocols—may experience reduced accuracy. Engineers must account for this variability in timing-sensitive designs by implementing software compensation or opting for external crystals where absolute precision is mandated.
What considerations apply when integrating the STM8AF52A8TAY into systems using CANbus communication, and how does its peripheral set support this?
The inclusion of a full CANbus controller in the STM8AF52A8TAY enables direct participation in Controller Area Network topologies common in automotive and industrial automation. The peripheral supports standard and extended frames, error detection, and message filtering via dedicated registers, reducing CPU overhead. Designers must ensure compliance with CAN physical layer requirements: proper termination resistors (typically 120Ω), differential signaling, and adherence to bus length and bit-rate limitations based on cable capacitance. The 24MHz core speed provides ample headroom for message processing even with multiple nodes active. Unlike some STM8 variants lacking CAN support, this model eliminates the need for external transceivers or bridge ICs, simplifying hardware integration and lowering system complexity.
How does the EEPROM size of 2KB in the STM8AF52A8TAY affect non-volatile data storage strategies compared to FLASH-based storage?
With 2KB of embedded EEPROM, the STM8AF52A8TAY offers fast, byte-wise write/erase capabilities ideal for storing configuration parameters, calibration data, serial numbers, or runtime counters that require frequent updates. Unlike FLASH memory, which has limited erase/write cycles (typically ~10k), EEPROM supports up to 1 million write cycles, enabling reliable long-term logging. However, the 2KB limit constrains total data volume; large datasets must be compressed or managed carefully with wear leveling algorithms. Developers can implement simple circular buffers or metadata tables within this space, but cannot rely on EEPROM for firmware updates. Instead, program updates occur via FLASH programming, preserving EEPROM longevity for critical user data.
What are the implications of the STM8AF52A8TAY’s 38 I/O pins for GPIO expansion and peripheral multiplexing?
The 38 available GPIOs allow flexible assignment across multiple functions, supporting both parallel sensor reading and serial communication simultaneously. Each pin can be remapped via alternate function registers to serve as UART RX/TX, I²C SDA/SCL, SPI MOSI/MISO, or PWM outputs. This enables efficient use of limited pin count without external mux chips. However, simultaneous activation of all high-current peripherals (e.g., driving LEDs or relays) must respect total package current sourcing/sinking limits. Additionally, analog inputs share pins with digital I/O, requiring careful pin selection to avoid contention. When designing with limited pins, developers should prioritize critical signals first and reserve remaining pins for future expansion or debugging purposes.
How does the power consumption profile of the STM8AF52A8TAY compare to modern ultra-low-power MCUs, and what modes support energy-efficient operation?
While not classified as an ultra-low-power device like certain ARM Cortex-M0+ parts, the STM8AF52A8TAY includes low-power modes such as halt and active-halt, reducing current draw to microamps during idle periods. Typical active-mode current at 24MHz and 5V is around 10 mA, which is acceptable for moderate-performance tasks but higher than sub-mA sleep currents achievable with newer architectures. The presence of brown-out detection and POR ensures safe wake-up sequences without external circuitry. For battery-powered applications, pairing this MCU with external low-dropout regulators and optimizing software duty cycles remains essential. It trades peak efficiency for simplicity and cost—a reasonable compromise when performance demands exceed ultra-low-power thresholds.
Can the STM8AF52A8TAY drive high-side or low-side loads directly, and what external components are needed for motor control applications?
The STM8AF52A8TAY’s I/O pins can source or sink up to 25mA, sufficient for driving LEDs or small relays directly. However, for inductive loads like motors or solenoids, external drivers such as N-channel MOSFETs (for low-side switching) or high-side switches (using P-channel FETs or dedicated ICs) are required due to voltage drop limitations and inductive kickback. Implementing H-bridge configurations demands complementary PWM signals and dead-time insertion to prevent shoot-through. Given the MCU’s built-in PWM module, precise timing control is feasible, but gate drive strength and flyback diodes must be added externally. Thus, while the STM8AF52A8TAY provides intelligent control logic, power stage components remain necessary for robust motor interfacing.
How does the absence of external memory interface affect system scalability when using the STM8AF52A8TAY?
The STM8AF52A8TAY lacks an external memory interface, meaning all code and data reside internally within 128KB FLASH and 6KB RAM. This simplifies PCB layout and reduces component count but imposes hard limits on application size. Firmware exceeding 128KB cannot be loaded without segmentation or compression techniques. Real-time data buffers beyond 6KB require careful management or external SRAM, adding cost and complexity. For expandable systems, this constraint favors modular software design with dynamic loading of routines or use of lookup tables rather than raw code volume. In practice, many industrial controls fit within these boundaries, but vision-processing or large protocol stacks may necessitate migration to memory-rich architectures.
What development tools and compiler support are available for the STM8AF52A8TAY, and how does this impact time-to-market?
The STM8AF52A8TAY benefits from mature development ecosystems including ST Visual Develop (STVD), Cosmic C compiler, and third-party tools like IAR Embedded Workbench. Open-source alternatives such as SDCC and GCC also support STM8 targets with community-maintained libraries. Hardware debugging typically requires an ST-LINK/V2 programmer/debugger, which is widely available and inexpensive. Given the 8-bit heritage, learning curves may be steeper for developers accustomed to 32-bit toolchains, but documentation and example code from ST simplify initial setup. The availability of free evaluation versions and extensive peripheral libraries accelerates prototyping, though commercial compilers often offer better optimization for tight memory constraints.

Parts with Similar Specifications

The three parts on the right have similar specifications to STMicroelectronics STM8AF52A8TAY

Product Attribute STM8AF52A8TDY STM8AF52A9TAY STM8AF52A8TDX STM8AF528ATCY
Part Number STM8AF52A8TDY STM8AF52A9TAY STM8AF52A8TDX STM8AF528ATCY
Manufacturer STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics
Program Memory Size - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Data Converters - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
EEPROM Size - - - -
Connectivity - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Base Product Number - DAC34H84 MAX500 ADS62P42
Oscillator Type - - - -
Core Processor - - - -
Peripherals - - - -
Voltage - Supply (Vcc/Vdd) - - - -
Number of I/O - - - -
Program Memory Type - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Series - - - -
Speed - - - -
Core Size - - - -
RAM Size - - - -

STM8AF52A8TAY Datasheet PDF

Download STM8AF52A8TAY pdf datasheets and STMicroelectronics documentation for STM8AF52A8TAY - STMicroelectronics.

HTML Datasheet
STM8AF52xx, STM8AF62xx.pdf
PCN Packaging
2.73KHz.pdf
PCN Design/Specification
Cylindrical Battery Holders.pdf
PCN Obsolescence/ EOL
Cylindrical Battery Holders.pdf
PCN Assembly/Origin
STM8A Testing Chgs 13/Dec/2021.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
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STM8AF52A8TAY Image

STM8AF52A8TAY

STMicroelectronics
32D-STM8AF52A8TAY

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