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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersSTM8AF52A8TCX
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STM8AF52A8TCX - STMicroelectronics

Manufacturer Part Number
STM8AF52A8TCX
Manufacturer
STMicroelectronics
Allelco Part Number
32D-STM8AF52A8TCX
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
12,563 pcs available, New & Original
Parts Description
IC MCU 8BIT 128KB FLASH 48LQFP
Package
48-LQFP
Data sheet
STM8AF52A8TCX.pdf

PCN Design/Specification

Mult Dev 28/Nov/2022.pdf

PCN Obsolescence/ EOL

Mult Dev EOL 29/Oct/2021.pdf
RoHs Status
ROHS3 Compliant
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In stock: 12563

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Specifications

STM8AF52A8TCX Tech Specifications
STMicroelectronics - STM8AF52A8TCX technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - STM8AF52A8TCX

Product Attribute Attribute Value
Manufacturer STMicroelectronics
Voltage - Supply (Vcc/Vdd) 3V ~ 5.5V
Speed 24MHz
Series Automotive, AEC-Q100, 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 Tape & Reel (TR)
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 125°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

STM8AF52A8TCX Image
STM8AF52A8TCX (1)

Manufacturer Part Number

STM8AF52A8TCX

Manufacturer

STMicroelectronics

Introduction

The STM8AF52A8TCX is a versatile 8-bit microcontroller from the STM8A series designed for automotive and industrial applications.

Product Features and Performance

8-Bit Core Processor STM8A

High processing speed of 24MHz

Multiple connectivity options including CANbus, I2C, LINbus, SPI, UART/USART

Peripherals include Brown-out Detect/Reset, Power-on Reset, PWM, WDT

Generous I/O count with 38 programmable inputs/outputs

Large program memory size of 128KB FLASH

Integrated EEPROM of 2K x 8

RAM size of 6K x 8 for efficient data handling

Internal oscillator for clock generation

Analog to Digital Converter with 10 channels of 10 bits resolution

Product Advantages

Optimized for robust automotive applications with AEC-Q100 qualification

Flexible voltage supply range from 3V to 5.5V compatible with various power systems

Operating temperature range suitable for harsh conditions (-40°C to 125°C)

Surface Mount 48-LQFP package for space-saving PCB design

Key Technical Parameters

Core Size: 8-Bit

Speed: 24MHz

Program Memory: 128KB FLASH

EEPROM: 2K x 8

RAM: 6K x 8

I/O Count: 38

Voltage Supply: 3V ~ 5.5V

ADC: 10x10b

Operating Temperature Range: -40°C ~ 125°C

Quality and Safety Features

Brown-out Detect/Reset

Watchdog Timer (WDT)

Automotive Grade with AEC-Q100 Qualification

Compatibility

Surface Mount Technology (SMT) compatible with modern PCB assembly

48-LQFP package easily integrates into various designs

Compatible with STM8A product family for design scalability

Application Areas

Automotive Systems

Industrial Control

Consumer Electronics

Embedded Systems

Product Lifecycle

Product Status: Not For New Designs (consider planning for future replacements or upgrades)

Several Key Reasons to Choose This Product

Advanced connectivity suite suitable for complex automotive systems

Robust design qualified for automotive standards ensures reliability

High flash memory capacity allows for extensive program storage

Varied peripheral set for comprehensive system control and monitoring

Flexible power supply requirements accommodate different power sources

Extensive operating temperature range for use in various environmental conditions

Compatibility with STM8 family eases future scalability and system updates

Frequently Asked Questions(FAQ)

How does the STM8AF52A8TCX compare to other STM8A series microcontrollers in terms of program memory and I/O availability for automotive-grade embedded systems?
The STM8AF52A8TCX offers 128KB of Flash program memory, which is among the higher-capacity variants in the STM8A family, supporting complex firmware architectures typical in automotive applications. With 38 programmable I/O pins and integrated peripherals such as CANbus, LINbus, and UART/USART, it provides a balance between processing power and connectivity that makes it suitable for mid-tier control modules where space and functionality are both constrained.
What design considerations should be made when selecting the STM8AF52A8TCX for a high-temperature automotive environment?
Given its operating temperature range of -40°C to 125°C (TA), the STM8AF52A8TCX meets stringent automotive standards, including AEC-Q100 qualification. Engineers must ensure PCB layout accounts for thermal expansion, use compatible passives rated for extended temperatures, and validate signal integrity under thermal cycling. The internal oscillator stability across this range should also be verified against system timing requirements at temperature extremes.
Can the STM8AF52A8TCX reliably interface with analog sensors using its built-in ADC without additional signal conditioning?
The STM8AF52A8TCX features a 10-bit successive approximation ADC with 10 channels, providing sufficient resolution for many industrial and automotive sensor applications. However, for precision-critical measurements—such as temperature or pressure sensing—external amplification and filtering are typically required due to noise susceptibility and limited input voltage range. The ADC reference voltage must be stable, and software calibration routines may be needed to correct offset and gain errors over temperature.
How does the power supply tolerance of the STM8AF52A8TCX influence system-level design compared to lower-voltage alternatives?
Operating from 3V to 5.5V allows the STM8AF52A8TCX to interface with legacy automotive systems that use 5V logic levels while maintaining compatibility with modern low-power subsystems. This flexibility reduces the need for level shifters but requires careful attention to power sequencing and brown-out detection configuration. At 3.3V operation, dynamic power consumption drops significantly, extending battery life in hybrid or electric vehicle applications where auxiliary loads are present.
What trade-offs exist between using the internal oscillator versus an external crystal with the STM8AF52A8TCX?
The STM8AF52A8TCX includes a robust internal RC oscillator calibrated to ±1% accuracy at 25°C, enabling cost-effective designs with minimal external components. However, external crystals provide superior frequency stability (±20 ppm typical) and lower jitter, critical for time-sensitive protocols like CANbus in safety-relevant domains. Switching to an external resonator increases board real estate and assembly cost but improves overall system reliability in vibration-prone environments.
Is the STM8AF52A8TCX suitable for functional safety applications requiring fault detection mechanisms?
While not certified for ISO 26262 ASIL levels, the STM8AF52A8TCX supports several hardware-based fault mitigation features including Power-On Reset (POR), Brown-Out Detection (BOD), and Watchdog Timer (WDT). These can form part of a safety architecture if augmented with software checks and redundancy strategies. For ASIL-rated systems, additional monitoring layers beyond what the MCU provides are necessary, making it appropriate only for QM or low-risk functions without independent safety controllers.
How much RAM and EEPROM does the STM8AF52A8TCX offer, and what are realistic usage limits during runtime?
The device contains 6K x 8 bytes of RAM and 2K x 8 bytes of EEPROM. This constrains real-time data logging or stack-intensive tasks; for example, storing 1000 samples of 16-bit sensor data consumes ~2KB of RAM alone. EEPROM endurance is rated at 100,000 write cycles, so frequent updates should use RAM buffering followed by batch writes. Memory management must be carefully planned to avoid overflow during interrupt service routines or DMA transfers.
What packaging options are available for the STM8AF52A8TCX, and how does the LQFP variant affect routing density?
The STM8AF52A8TCX is offered in a 48-LQFP package, which provides 38 usable GPIOs arranged in a compact 7x7 mm footprint with 0.5 mm pitch. This facilitates dense PCB layouts but demands precise impedance control on high-speed signals like SPI or I2C. Thermal vias under the exposed pad can improve heat dissipation in continuous-operation scenarios. Automated pick-and-place equipment can handle this package efficiently, reducing manual assembly risks.
Does the STM8AF52A8TCX support dual-bank flash for self-programming or bootloader functionality?
No, the STM8AF52A8TCX uses a single-bank flash architecture without hardware dual-bank support. Firmware updates must occur via serial bootloaders that temporarily halt execution, copy new code into inactive regions after erase, then remap vectors—introducing brief downtime. For field-upgradable systems, this approach is acceptable if interrupted programming is managed carefully through checksum validation and rollback mechanisms.
How does the STM8AF52A8TCX’s CANbus peripheral compare to dedicated transceivers in terms of noise immunity and protocol handling?
The integrated CAN controller supports full CAN 2.0B compliance, handling arbitration, framing, and error detection internally. It offloads these tasks from the CPU, improving real-time performance. However, external transceivers are still required for physical layer signaling; selecting one with galvanic isolation enhances noise immunity in harsh EMI environments like engine compartments. Total bit error rates depend more on transceiver quality and PCB layout than on the MCU itself.
What impact do moisture sensitivity level (MSL) 3 and RoHS compliance have on procurement and reliability?
As an MSL 3 component (168-hour floor life), the STM8AF52A8TCX must be stored in dry ambient conditions and reflowed within 168 hours after soldering paste exposure. RoHS3 compliance ensures halogen-free and lead-free manufacturing, aligning with global regulations but requiring compatible solder pastes and fluxes. Both factors influence shelf-life planning and rework procedures, particularly in high-volume automotive production lines with strict traceability requirements.
Can the PWM modules on the STM8AF52A8TCX drive inductive loads directly, or is an external driver needed?
The STM8AF52A8TCX provides general-purpose PWM outputs capable of driving resistive or capacitive loads directly. Inductive loads such as motors require external MOSFETs or gate drivers to prevent back-EMF damage to the MCU pins. Flyback diodes or TVS protection should be added at the output stage. Software dead-time insertion in the PWM configuration helps avoid shoot-through in half-bridge topologies when used with external switching elements.
How does the UART/USART peripheral perform in multi-drop communication setups common in legacy automotive networks?
The USART supports standard asynchronous modes with variable baud rates up to 4.5 Mbps, enabling reliable point-to-point or multi-drop RS-485 configurations when paired with appropriate transceivers. Hardware flow control (RTS/CTS) reduces software overhead, but collision avoidance protocols must be implemented at the application layer. Parity and FIFO buffers help manage data bursts, though buffer overflow remains a risk under sustained high-speed transmission without proper interrupt prioritization.
What development tools and IDE support exist for the STM8AF52A8TCX?
STMicroelectronics provides STM8CubeIDE based on Eclipse, offering HAL libraries, pinout configuration, and debugging via ST-Link. Third-party tools like IAR Embedded Workbench and Cosmic C compilers also support the STM8AF52A8TCX, though optimization levels vary. Simulation models may lack cycle-accurate peripheral timing, so hardware-in-the-loop testing is recommended before deployment. Code size limitations apply when targeting smaller memory footprints within the 128KB Flash limit.

Parts with Similar Specifications

The three parts on the right have similar specifications to STMicroelectronics STM8AF52A8TCX

Product Attribute STM8AF52A8TDX STM8AF528ATCX STM8AF52A8TDY STM8AF528ATCY
Part Number STM8AF52A8TDX STM8AF528ATCX STM8AF52A8TDY STM8AF528ATCY
Manufacturer STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics
Connectivity - - - -
Core Size - - - -
EEPROM Size - - - -
Data Converters - - - -
RAM Size - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Number of I/O - - - -
Speed - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Program Memory Size - - - -
Program Memory Type - - - -
Core Processor - - - -
Oscillator Type - - - -
Voltage - Supply (Vcc/Vdd) - - - -
Peripherals - - - -
Series - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

STM8AF52A8TCX Datasheet PDF

Download STM8AF52A8TCX pdf datasheets and STMicroelectronics documentation for STM8AF52A8TCX - STMicroelectronics.

PCN Packaging
CRP/14/8400 20/Mar/2014.pdf Material Barrier Bag 17/Dec/2020.pdf
PCN Design/Specification
Mult Dev 28/Nov/2022.pdf
PCN Obsolescence/ EOL
Mult Dev EOL 29/Oct/2021.pdf
PCN Assembly/Origin
STM8A Testing Chgs 13/Dec/2021.pdf
HTML Datasheet
STM8AF52xx, STM8AF62xx.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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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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STM8AF52A8TCX Image

STM8AF52A8TCX

STMicroelectronics
32D-STM8AF52A8TCX

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