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STMicroelectronics STM8AF5268TDY

Name: STM8AF5268TDY
Brand: STMicroelectronics
SKU: STM8AF5268TDY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM8AF5268TDY

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 48-LQFP

Datasheet:: STM8AF5268TDY.pdf

Description:: IC MCU 8BIT 32KB FLASH 48LQFP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STM8AF5268TDY from STMicroelectronics is an AEC-Q100 Grade 0 qualified automotive 8-bit MCU featuring a 24 MHz STM8A core, 64 Kbyte Flash program memory, 2 Kbyte data EEPROM, 10-bit ADC with 16-channel multiplexing, CAN 2.0B interface, and operation up to 150 °C - deployed in engine control units for real-time sensor signal acquisition and actuator command execution.

For engineers reviewing the STM8AF5268TDY datasheet, STM8AF5268TDY pinout, STM8AF5268TDY application, or STM8AF5268TDY equivalent, key selection criteria include CAN/LIN coexistence, high-temperature reliability (−40 °C to 150 °C), Flash/data EEPROM endurance (300 kcycle), and integrated clock security system for safety-critical automotive subsystems.

Technical Context

The STM8AF5268TDY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, delivering 10 MIPS at 16 MHz. Its clock system integrates trimmable 16 MHz HSI, 128 kHz LSI, and external crystal support with Clock Security System (CSS) monitoring.

Peripheral integration includes a dedicated beCAN controller compliant with ISO 11898-1, LINUART supporting LIN 2.2 master/slave with automatic resynchronization, and an advanced control timer with dead-time insertion and complementary outputs - all optimized for deterministic timing in powertrain and body electronics.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic interrupt latency and efficient code density for resource-constrained ECUs.
Max fCPU	24 MHz at VDD = 3–5.5 V; supports real-time control loops with sub-μs instruction timing in automotive operating conditions.
Flash Memory	64 Kbyte program Flash with 20-year data retention at 55 °C; sufficient for complex firmware including bootloader, diagnostics, and application logic.
Data EEPROM	2 Kbyte true data EEPROM with 300 kcycle endurance; stores calibration parameters, fault logs, and configuration without external NV memory.
CAN Interface	High-speed 1 Mbit/s CAN 2.0B controller (beCAN); enables robust communication with other ECUs on vehicle networks without external transceiver logic.
ADC Resolution	10-bit SAR ADC with ±2 LSB total unadjusted error (TUE) and 16 multiplexed inputs; meets precision requirements for analog sensor interfacing (e.g., throttle position, coolant temp).
Operating Temp	−40 °C to +150 °C ambient; validated per AEC-Q100 Grade 0 for under-hood deployment in engine management systems.
Supply Voltage	3.0 V to 5.5 V; compatible with standard automotive battery rails and tolerant of load-dump transients when paired with appropriate protection circuitry.

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, with exposed thermal pad for enhanced heat dissipation in high-temperature environments.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VSS	Power supply and ground	Dual VDD/VSS pairs ensure stable core and I/O domain operation; decoupling required per datasheet layout guidelines.
NRST	Active-low reset input	Asynchronous reset with internal pull-up; supports external watchdog or microcontroller-initiated system recovery.
PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7	General-purpose I/O ports	64-pin variant provides up to 56 user I/Os; 11 pins support high-sink capability (20 mA) for direct LED/relay drive.
TXD1/RXD1	USART1 serial interface	Full-duplex UART with LIN master mode support; enables diagnostic communication and ECU reprogramming via OBD-II.
CANRX/CANTX	CAN physical layer interface	Dedicated differential pair for connection to external CAN transceiver (e.g., TJA1042); supports bus arbitration and error handling per ISO 11898-1.
OSC_IN/OSC_OUT	External crystal oscillator terminals	Supports 1–24 MHz crystals; used for precise timing in CAN synchronization and real-time clock functions.

Key Features

Feature	Design Value
Advanced Control Timer (TIM1)	16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion - enables precise 3-phase motor gate driving in electric power steering.
Clock Security System (CSS)	Monitors HSE oscillator activity and triggers reset if failure detected - critical for fail-safe behavior in ASIL-B relevant functions.
LINUART Module	Fully LIN 2.2 compliant with automatic resynchronization and master/slave modes - eliminates need for external LIN transceiver in body control modules.
Low-Power Modes	Wait, Auto-Wakeup, and Halt modes with configurable clock gating - reduces current to <1 μA in Halt mode for battery-sensitive applications like door modules.
Robust I/O Design	Immunity to current injection up to 100 mA per pin - ensures reliable operation in noisy automotive harness environments.

Applications

Engine Control Unit (ECU)

Transmission Control Module (TCM)

Use Scenario: Real-time acquisition of crankshaft position, camshaft timing, and oxygen sensor signals; closed-loop fuel injection and ignition timing calculation.

IC Role / Device Role / Timing Role: Primary controller executing deterministic control algorithms with sub-100 μs interrupt response; synchronizes CAN messaging with engine cycle events.

Use Value: Integrated 10-bit ADC with hardware oversampling and CAN 2.0B reduce BOM count and improve timing coherence versus discrete signal chain solutions.

Use Scenario: Monitoring gear selector position, turbine speed, and hydraulic pressure; managing solenoid valve sequencing during shift events.

IC Role / Device Role / Timing Role: Safety-aware actuator driver coordinating with powertrain CAN network; uses advanced timer dead-time control for PWM-driven solenoids.

Use Value: AEC-Q100 Grade 0 qualification and 150 °C operation enable direct placement near transmission housing, eliminating remote mounting and signal degradation.

Body Control Module (BCM)

Electric Power Steering (EPS)

Use Scenario: Centralized management of lighting, window lift, mirror adjustment, and LIN-connected door modules.

IC Role / Device Role / Timing Role: LIN master coordinating slave nodes; handles wake-up via LIN header detection and manages low-power sleep states.

Use Value: Integrated LINUART with automatic resync tolerates bus voltage fluctuations common in 12 V vehicle architectures, improving node interoperability.

Use Scenario: Torque assist computation using torque sensor, motor position, and vehicle speed inputs; generation of 3-phase PWM for brushless assist motor.

IC Role / Device Role / Timing Role: Real-time motor controller with synchronized ADC sampling and complementary PWM output with dead-time protection.

Use Value: TIM1's hardware dead-time insertion prevents shoot-through in inverter bridges, eliminating need for external gate driver safety logic.

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive microcontroller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STM8AF5286TDY	128 Kbyte Flash, same peripherals and package; higher memory for extended diagnostics and OTA update capability.	Suitable for next-gen ECUs requiring dual-bank Flash for safe firmware updates.	Select when firmware size exceeds 64 Kbyte or field upgrade safety is mandatory.
STM8AF6269TDY	No CAN interface; retains LIN, USART, SPI, I2C, and identical Flash/EEPROM specs.	Targeted at non-CAN body electronics (e.g., seat control, HVAC) where cost reduction outweighs CAN requirement.	Choose only if CAN is unused in design - avoids over-specification and lowers unit cost.

Compared with STM8AF5286TDY, the STM8AF5268TDY trades Flash capacity for lower cost and smaller die size while retaining full CAN functionality; versus STM8AF6269TDY, it adds essential CAN capability at minimal footprint penalty - making it optimal for mid-tier automotive nodes requiring both LIN and CAN connectivity.

Availability

STM8AF5268TDY is available at Aetrix Electronics and suitable for engine control units, transmission control modules, body control modules, and electric power steering systems requiring stable component supply across extended automotive lifecycles.

Supply support for STM8AF5268TDY includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and automotive-grade silicon for industrial and transportation markets.

The STM8A automotive MCU product line targets cost-sensitive, high-reliability applications in powertrain, chassis, and body electronics - emphasizing AEC-Q100 compliance, extended temperature operation, and integrated functional safety features.

FAQ

What is the maximum operating frequency of the STM8AF5268TDY core?

The STM8AF5268TDY core operates at up to 24 MHz under specified supply and temperature conditions (VDD = 3.0–5.5 V, TA = −40 °C to +150 °C). This frequency is achievable with the internal 16 MHz HSI oscillator trimmed via option bytes or with an external crystal up to 24 MHz, as confirmed in Section 5.5.4 of the datasheet.

Does the STM8AF5268TDY support LIN communication natively?

Yes - the device integrates a LINUART module compliant with LIN 2.2 specification, supporting both master and slave modes with automatic resynchronization. It requires no external LIN transceiver for basic node functionality, though a physical-layer transceiver (e.g., TLE7259-3GE) is needed for bus connection.

How many I/O pins are available in the LQFP64 package?

The STM8AF5268TDY in LQFP64 provides up to 56 user-configurable I/O pins across six ports (PA–PF), with 11 pins rated for high-sink capability (20 mA). Pin allocation and alternate functions are fully documented in Table 11 and Figures 4–6 of the datasheet.

Is the STM8AF5268TDY qualified for automotive use?

Yes - it is AEC-Q100 qualified to Grade 0 (−40 °C to +150 °C), with validation covering accelerated environmental stress, ESD, latch-up, and lifetime reliability testing per automotive standards. Qualification documentation is referenced in Section 1 of the datasheet and ST's official product page.

STM8AF5268TDY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 48-LQFP

Series:: STM8A

Packaging:: Tray

Product Status:: Active

Programmable:: Not Verified

Core Processor:: STM8A

Core Size:: 8-Bit

Speed:: 24MHz

Connectivity:: CANbus, I2C, LINbus, SPI, UART/USART

Peripherals:: Brown-out Detect/Reset, POR, PWM, WDT

Number of I/O:: 38

Program Memory Size:: 32KB (32K x 8)

Program Memory Type:: FLASH

EEPROM Size:: 1K x 8

RAM Size:: 6K x 8

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

Data Converters:: A/D 10x10b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 150°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:

STM8AF5268TDY FAQ

1.How can I place an order for STM8AF5268TDY through Aetrix?

Please submit a Request for Quotation (RFQ) for STM8AF5268TDY on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STM8AF5268TDY reliable?

The price and inventory of STM8AF5268TDY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF5268TDY is usually 5 days.

3.What payment methods are accepted for STM8AF5268TDY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF5268TDY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM8AF5268TDY?

STM8AF5268TDY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM8AF5268TDY order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STM8AF5268TDY?

For technical support, including STM8AF5268TDY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF5268TDY requirements.

6.How does Aetrix verify that STM8AF5268TDY is sourced from the original manufacturer or authorized distributors?

All STM8AF5268TDY products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM8AF5268TDY meets industry standards.

7.What is the process for return or replacement of STM8AF5268TDY?

All STM8AF5268TDY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF5268TDY, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STM8AF5268TDY part is unused and in its original packaging.

Return procedure for STM8AF5268TDY:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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