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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersSTM8AF52A8TDY
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STM8AF52A8TDY - STMicroelectronics

Manufacturer Part Number
STM8AF52A8TDY
Manufacturer
STMicroelectronics
Allelco Part Number
32D-STM8AF52A8TDY
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
8,155 pcs available, New & Original
Parts Description
IC MCU 8BIT 128KB FLASH 48LQFP
Package
48-LQFP
Data sheet
STM8AF52A8TDY.pdf

PCN Design/Specification

Mult Dev 28/Nov/2022.pdf

PCN Obsolescence/ EOL

Mult Dev EOL 29/Oct/2021.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 8155
  • Unit Price: $5.179
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $5.179 $5.18
10+ $4.529 $45.29
30+ $4.132 $123.96
100+ $3.80 $380.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

STM8AF52A8TDY Tech Specifications
STMicroelectronics - STM8AF52A8TDY technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - STM8AF52A8TDY

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 Tray
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 150°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

STM8AF52A8TDY Image
STM8AF52A8TDY (1)

Manufacturer Part Number

STM8AF52A8TDY

Manufacturer

STMicroelectronics

Introduction

High-performance, 8-bit, low-power microcontroller with advanced peripherals and analog features, ideal for automotive and industrial applications.

Product Features and Performance

8-bit STM8A core with 24MHz operating speed

128KB Flash program memory

6KB RAM

2KB EEPROM

10-bit, 10-channel ADC

CAN, LIN, SPI, UART/USART interfaces

PWM, brownout detection, power-on reset, watchdog timer

Operating temperature range of -40°C to 150°C

Product Advantages

Robust design for harsh automotive and industrial environments

Extensive peripheral set for versatile application development

Low power consumption for battery-powered systems

Scalable performance and peripheral options within the STM8A family

Key Technical Parameters

8-bit STM8A core

24MHz operating speed

128KB Flash, 6KB RAM, 2KB EEPROM

10-bit, 10-channel ADC

CAN, LIN, SPI, UART/USART interfaces

PWM, brownout detection, power-on reset, watchdog timer

48-LQFP package

3V to 5.5V supply voltage

Internal oscillator

Quality and Safety Features

AEC-Q100 qualified for automotive applications

RoHS3 compliant

Robust design for harsh environments

Extensive peripheral set for functional safety

Compatibility

Compatible with other STM8A series microcontrollers, allowing for easy migration and scalability within the product family.

Application Areas

Automotive: Engine control, body electronics, sensor interfaces

Industrial: Motor control, power conversion, sensor monitoring

Consumer: Home appliances, power tools, smart home devices

Product Lifecycle

The STM8AF52A8TDY is an active product in the STM8A series. Replacement or upgrade options are available within the STM8A family to meet evolving application requirements.

Key Reasons to Choose This Product

Robust automotive and industrial-grade design

Extensive peripheral set for versatile application development

Low power consumption for battery-powered systems

Scalable performance and peripheral options within the STM8A family

AEC-Q100 qualified and RoHS3 compliant for reliability and safety

Long-term availability and support from STMicroelectronics

Frequently Asked Questions(FAQ)

How does the STM8AF52A8TDY handle voltage fluctuations in automotive environments where power stability cannot be guaranteed?
The STM8AF52A8TDY includes a built-in brown-out detection and reset circuit, which monitors Vcc/Vdd during operation. When supply voltage drops below a defined threshold (typically around 3.0V for a 3.3V nominal system), the device automatically triggers a reset sequence to prevent erratic behavior or data corruption. This is particularly valuable in automotive applications where load dumps or cold-crank conditions may cause transient undervoltage events.
What trade-offs exist between using internal versus external oscillators with the STM8AF52A8TDY in terms of timing accuracy and system reliability?
The STM8AF52A8TDY relies on an internal RC oscillator that provides a nominal frequency of 24MHz with typical accuracy of ±2% over temperature and voltage variations. While sufficient for most CANbus and LINbus communications, this drift can affect UART baud rate precision in wide-temperature environments. External crystal oscillators offer higher stability (±10 ppm or better) but increase component count, PCB real estate, and cost. For time-critical automotive diagnostics or sensor fusion requiring precise timing, an external crystal may be preferable despite added complexity.
Can the STM8AF52A8TDY support multiple communication protocols simultaneously without bus contention or arbitration issues?
Yes, the STM8AF52A8TDY integrates hardware peripherals including CANbus, I2C, LINbus, SPI, and UART/USART interfaces, allowing concurrent protocol usage under proper firmware control. However, shared pins must be configured correctly—for example, CAN transceiver pins are dedicated, while I2C and UART share alternate function mappings. Careful attention to pin multiplexing and interrupt prioritization is required when operating multiple high-speed buses like CAN and SPI simultaneously to avoid data collisions or missed messages.
How does the STM8AF52A8TDY compare to other STM8 series microcontrollers in terms of memory architecture and code density?
Compared to lower-end STM8 variants such as the STM8S003, the STM8AF52A8TDY offers significantly larger program memory (128KB FLASH vs. typically 16–32KB) and more RAM (6KB vs. 1–2KB), enabling complex state machines, diagnostic logging, and real-time protocol stacks. It also retains backward compatibility with STM8 core instructions, ensuring existing codebases can be ported with minimal changes. The 2Kx8 EEPROM supports non-volatile configuration storage without requiring external EEPROM chips.
Is it feasible to use the STM8AF52A8TDY in safety-critical automotive subsystems requiring functional safety certification?
While the STM8AF52A8TDY is AEC-Q100 qualified and operates across -40°C to 150°C, it is not formally certified under ISO 26262 for ASIL levels. Functional safety would require additional measures such as watchdog timers, memory protection units (not present on STM8), runtime error detection, and redundancy mechanisms implemented in software. Engineers must conduct hazard analysis and validate mitigation strategies independently if targeting safety integrity levels.
What impact does operating near the upper voltage limit (5.5V) have on the performance of peripherals like the ADC in the STM8AF52A8TDY?
The STM8AF52A8TDY’s ADC (10-bit resolution, 10 channels) has an absolute maximum input range tied to Vdd. At 5.5V supply, the reference voltage approaches its limit, potentially reducing effective resolution due to noise susceptibility or internal divider inaccuracies. Additionally, analog front-end circuits may exhibit increased nonlinearity at elevated voltages. For consistent ADC performance, it's recommended to operate within 3.3V–4.5V unless the application specifically requires 5V tolerance, in which case calibration routines should account for gain errors.
How does the STM8AF52A8TDY manage power consumption during sleep modes when used in battery-powered automotive edge nodes?
The STM8AF52A8TDY supports multiple low-power modes, including Halt and Active-Halt, where current draw can drop below 1 µA while retaining register and RAM contents. Wake-up sources include external interrupts, RTC alarms, and peripheral activity such as CAN message reception. In Stop mode, clock generation ceases, further reducing power. These features enable long battery life in telematics or monitoring nodes, provided the wake-up latency aligns with application timing requirements.
Can the STM8AF52A8TDY drive multiple LINbus slaves reliably over long cable runs in harsh environments?
The STM8AF52A8TDY includes a LINbus-compatible UART with configurable baud rates down to 1 kbps, suitable for master node implementation. However, driving long cables demands careful design of termination, slew rate control, and signal integrity. Without external LIN transceivers capable of handling automotive EMI, the MCU’s GPIO pins must interface through such devices. Signal reflections and ground shifts can corrupt frames; thus, proper layout, shielding, and adherence to LIN specification v2.1/v2.2 are essential for reliable operation beyond short harness lengths.
What considerations apply when upgrading legacy systems from STM8S to STM8AF52A8TDY in terms of bootloader compatibility and flash programming?
The STM8AF52A8TDY shares the same STM8 core architecture and instruction set as STM8S devices, enabling direct binary compatibility. Bootloaders written for STM8S can generally run unchanged, assuming no reliance on deprecated peripherals. However, differences in flash size (128KB vs. smaller variants) mean bootloader address ranges must be adjusted to avoid overwriting critical sections. STMicroelectronics provides updated STVD and Flash Loader Demonstrator tools that auto-detect device memory maps, simplifying migration workflows.
How robust is the watchdog timer implementation in the STM8AF52A8TDY against spontaneous resets during electromagnetic interference events?
The STM8AF52A8TDY features a windowed watchdog timer (WWDG) that enforces both minimum and maximum reload windows, preventing runaway code even if interrupts are masked. Unlike basic independent watchdogs, the WWDG resets only if fed outside the allowed interval, making it resistant to accidental writes. During EMI-induced glitches, the WWDG ensures recovery within milliseconds, provided software maintains timely service calls and avoids disabling interrupts indefinitely.
Does the STM8AF52A8TDY support dynamic reconfiguration of PWM duty cycles during runtime without disrupting adjacent signals?
Yes, the STM8AF52A8TDY includes advanced PWM modules with independent channel control and shadow registers. Critical updates can be staged via DMA or synchronized across multiple outputs using hardware trigger chains. This allows smooth transitions—such as LED dimming or motor speed ramping—without visible artifacts or shoot-through risks in half-bridge configurations. Software must still ensure atomic access to CCR (Capture/Compare Register) values to prevent partial updates during reload cycles.
What limitations exist when connecting multiple SPI devices to the STM8AF52A8TDY using shared MISO/MOSI lines?
The STM8AF52A8TDY supports full-duplex SPI communication, but all slave devices must share MOSI and MISO lines with individual chip selects (NSS). Daisy-chaining reduces pin count but increases propagation delay and limits daisy-chain depth due to capacitive loading. Without hardware CS management, software-driven NSS toggling introduces jitter. Additionally, bidirectional MISO lines require tri-state buffers or open-drain logic unless slaves support multi-master arbitration—designers must verify slave compliance and add isolation where needed.
How does temperature variation affect the internal RC oscillator accuracy of the STM8AF52A8TDY across its full automotive range?
Over the -40°C to 150°C range, the internal RC oscillator drifts approximately ±5% due to semiconductor process variations and thermal effects. At 150°C, the frequency may drop by up to 10% below room temperature, impacting CAN timing margins. While STMicroelectronics calibrates each device post-manufacturing, users should expect this drift in worst-case scenarios. Applications requiring tight timing must either calibrate periodically using an external reference (e.g., GPS PPS) or switch to a crystal oscillator.
Can the STM8AF52A8TDY interface directly with 3.3V sensors without level shifting, given its 3.0V minimum supply voltage?
The STM8AF52A8TDY operates from 3.0V to 5.5V, so inputs above Vdd are clamped internally but not protected against sustained overvoltage. Connecting a 3.3V sensor to a 3.0V-powered STM8AF52A8TDY risks exceeding input thresholds during brownout conditions or transient spikes. Level shifters or resistive dividers are recommended when interfacing with higher-voltage logic. Alternatively, operating both devices at 3.3V ensures compatibility and preserves noise margins for reliable digital signaling.
What role does the Power-On Reset (POR) play in protecting data integrity during startup sequences involving slow-ramping supplies?
The STM8AF52A8TDY’s POR circuitry holds the microcontroller in reset until Vdd stabilizes above ~1.8V, preventing partial initialization that could corrupt RAM or flash states. Combined with brown-out detection, this ensures clean entry into user code only after stable power. During slow ramp-ups common in battery systems, the POR delays execution until sufficient charge is available, avoiding undefined behavior that might trigger unintended peripheral activation.

Parts with Similar Specifications

The three parts on the right have similar specifications to STMicroelectronics STM8AF52A8TDY

Product Attribute STM8AF52A8TDX STM8AF52A8TAY STM8AF52A9TCY STM8AF52A9TAY
Part Number STM8AF52A8TDX STM8AF52A8TAY STM8AF52A9TCY STM8AF52A9TAY
Manufacturer STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics
Connectivity - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Series - - - -
Peripherals - - - -
Voltage - Supply (Vcc/Vdd) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Number of I/O - - - -
Core Size - - - -
Data Converters - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Mounting Type - Surface Mount Through Hole Surface Mount
Oscillator Type - - - -
Program Memory Type - - - -
Speed - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
RAM Size - - - -
Program Memory Size - - - -
EEPROM Size - - - -
Core Processor - - - -

STM8AF52A8TDY Datasheet PDF

Download STM8AF52A8TDY pdf datasheets and STMicroelectronics documentation for STM8AF52A8TDY - STMicroelectronics.

PCN Packaging
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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Brazil 7
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United Kingdom 4
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New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
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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:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
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Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


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STM8AF52A8TDY Image

STM8AF52A8TDY

STMicroelectronics
32D-STM8AF52A8TDY

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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