STMicroelectronics STM8AF6226TDY

Overview

STM8AF6226TDY from STMicroelectronics is an AEC-Q100 qualified automotive-grade 8-bit MCU featuring a 16 MHz STM8A core, 8 Kbyte Flash memory with 20-year data retention at 55 °C, 640 byte true data EEPROM (300 kcycle endurance), 1 Kbyte RAM, and integrated 10-bit ADC with 7 muxed channels. It supports LIN 2.2 communication, SPI up to 8 Mbit/s, I²C up to 400 Kbit/s, and operates across –40 to 150 °C for engine control unit (ECU) sensor interface applications.

For engineers reviewing the STM8AF6226TDY datasheet, STM8AF6226TDY pinout, STM8AF6226TDY application, or STM8AF6226TDY equivalent, key selection criteria include AEC-Q100 qualification, high-temperature operation up to 150 °C, LINUART master/slave compliance, 300 kcycle EEPROM endurance, and LQFP32/VFQFPN32 package compatibility for space-constrained automotive modules.

Technical Context

The STM8AF6226 implements a Harvard-architecture STM8A core with 3-stage pipeline and extended instruction set, enabling deterministic real-time execution in safety-critical automotive subsystems. Its clock system integrates trimmable 16 MHz RC and 128 kHz low-power oscillators, plus external crystal support with clock security monitoring.

Interrupt handling uses a nested controller supporting 32 vectors and up to 28 external interrupts across 7 priority levels, while peripheral integration includes an advanced 16-bit TIM1 timer with dead-time insertion and complementary outputs-critical for motor control timing precision-and dual 16-bit general-purpose timers (TIM5) with IC/OC/PWM capability.

Key Specifications

Pinout & Package

LQFP32 (7×7 mm) and VFQFPN32 (5×5 mm) packages are mechanically and electrically identical for STM8AF6226TDY, both offering 32-pin I/O with 28 usable GPIOs-including 21 high-sink outputs capable of 20 mA sink per pin-optimized for automotive load driving and noise immunity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive 8-bit MCU applications.

Compared with STM8AF6226TDY, STM8AF6223TDY offers identical automotive qualification and peripheral set at reduced memory cost, while RL78/F13 provides larger Flash and industry-wide tooling but adds external EEPROM dependency and breaks pin compatibility.

Availability

STM8AF6226TDY is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and electric power steering systems requiring stable component supply across automotive production lifecycles.

Supply support for STM8AF6226TDY 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, specializing in automotive, industrial, and power management solutions with vertical manufacturing capabilities.

The STM8AF automotive MCU product line targets cost-sensitive, high-reliability embedded control applications-including engine management, chassis systems, and body electronics-with AEC-Q100 qualification and extended temperature support up to 150 °C.

FAQ

Is STM8AF6226TDY pin-compatible with other STM8AF62xx variants?

Yes-STM8AF6226TDY shares identical LQFP32/VFQFPN32 pinouts with STM8AF6223 and STM8AF6213 families. All 32-pin variants use the same mechanical footprint, I/O mapping, and alternate function remapping bits, enabling drop-in replacement within the same package variant without PCB redesign.

What is the maximum allowable junction temperature during continuous operation?

The absolute maximum junction temperature for STM8AF6226TDY is 150 °C, verified per AEC-Q100 stress testing. Thermal design must maintain T_J ≤ 150 °C under worst-case ambient (125 °C) and power dissipation conditions, using package-specific θ_JA values (35 °C/W for LQFP32, 42 °C/W for VFQFPN32) and appropriate copper pour area.

Does the integrated LINUART support LIN 2.2 slave node auto-addressing?

Yes-the LINUART module supports LIN 2.2 slave node auto-addressing via the "Go To Sleep" and "Assign NAD" services. It implements hardware-assisted frame checksum calculation, identifier filtering, and automatic resynchronization to tolerate bus timing jitter up to ±15% without CPU intervention.

Can the 640-byte data EEPROM be used for storing cryptographic keys?

No-the data EEPROM is not secured against read-out or tampering; it lacks hardware encryption, write protection beyond option bytes, or secure boot enforcement. For cryptographic key storage, external secure elements (e.g., STSAFE-A) or flash-based key wrapping with SWIM debug lock are required per ISO/SAE 21434 guidelines.