Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Embedded > Microcontrollers

STMicroelectronics STM8AF6266UDY

Name: STM8AF6266UDY
Brand: STMicroelectronics
SKU: STM8AF6266UDY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: STM8AF6266UDY

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 32-VFQFN Exposed Pad

Datasheet:: STM8AF6266UDY.pdf

Description:: IC MCU 8BIT 32KB FLASH 32VFQFN

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,552

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

STM8AF6266UDY from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 32 Kbyte Flash program memory, 1 Kbyte true data EEPROM, 2 Kbyte RAM, and integrated 10-bit ADC with up to 10 channels. It supports LIN 2.2, SPI (up to 8 Mbit/s), I²C (400 Kbit/s), and advanced timers including a 16-bit advanced control timer with dead-time insertion - deployed in engine control units and body electronics requiring operation up to 150 °C.

For engineers reviewing the STM8AF6266UDY datasheet, STM8AF6266UDY pinout, STM8AF6266UDY application, or STM8AF6266UDY equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and interface specifications, and real-world use-case mappings for ECU design, LIN bus node implementation, and low-power sensor interface integration.

Technical Context

The STM8AF6266UDY 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 and 128 kHz LSI RC oscillators plus external crystal support, all monitored by a dedicated clock security system (CSS) for fail-safe operation.

Interrupt handling uses a nested controller with 32 vectors and up to 34 external interrupts mapped across 5 vectors. Analog subsystem includes a 10-bit ADC with 2 LSB TUE accuracy, scan mode, analog watchdog, and individual data buffers per channel - enabling precise sensor signal acquisition in harsh automotive environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic 10 MIPS throughput at 16 MHz for real-time control loops.
Flash Memory	32 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle; supports field firmware updates in automotive ECUs.
Data EEPROM	1 Kbyte true data EEPROM with 300 kcycle endurance; stores calibration data, fault logs, and configuration parameters without external NV memory.
ADC Resolution & Accuracy	10-bit SAR ADC with 2 LSB total unadjusted error (TUE); ensures ±0.2% measurement fidelity for throttle position or temperature sensing.
LIN Interface	LINUART compliant with LIN 2.2 spec, supporting master/slave modes and automatic resynchronization; eliminates need for external LIN transceiver in simple nodes.
Operating Temperature	-40 °C to +150 °C ambient range; qualified per AEC-Q100 Grade 0 for under-hood applications including transmission control and battery management.
Supply Voltage Range	3.0 V to 5.5 V; compatible with both 3.3 V and 5 V automotive power domains without level-shifting circuitry.

Pinout & Package

STM8AF6266UDY is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32 pins, optimized for space-constrained automotive modules. Pin functions include dedicated LINTX/LINRX, SPI MOSI/MISO/SCK, I²C SDA/SCL, ADC input channels (CH0–CH9), and high-sink GPIOs rated for direct LED or relay drive.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VSS	Power supply and ground	Dual power domain: VDD powers digital core and I/O; VSS provides low-noise return path for analog peripherals including ADC reference.
NRST	Active-low reset input	Asynchronous reset with internal pull-up; supports external watchdog or power-on reset assertion with programmable filter timing.
SWIM	Single-wire interface module	Debug and programming interface using one pin; enables in-circuit programming and real-time debugging without JTAG overhead.
LINRX / LINTX	LIN bus physical layer interface	Direct connection to LIN transceiver; supports slew-rate controlled output and noise-immune input for reliable 19.2 kbit/s communication.
PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7	General-purpose I/O ports	Up to 38 user pins with 10 high-sink (20 mA) outputs; configurable as analog inputs, EXTI sources, or remappable peripheral functions (e.g., TIM1_CH1 on PA1).

Key Features

Feature	Design Value
AEC-Q100 Grade 0 qualification	Validated for continuous operation at 150 °C junction temperature - meets reliability requirements for powertrain and chassis control modules.
Advanced control timer (TIM1)	16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and hardware dead-time insertion - enables precise 3-phase motor gate driving without software intervention.
Auto-wakeup timer & low-power modes	Wait/Halt/Active-halt modes with configurable clock gating; achieves sub-1 µA current in Halt mode while retaining RAM and register state.
Internal clock trimming	User-trimmable 16 MHz HSI oscillator with ±2% accuracy over temperature; reduces BOM cost by eliminating external crystal in non-critical timing applications.
Analog watchdog & scan mode	Hardware-monitored ADC thresholds with interrupt-on-violation; enables autonomous battery voltage monitoring or coolant temperature safety checks without CPU polling.

Applications

Engine Control Unit (ECU)

Body Control Module (BCM)

Use Scenario: Real-time monitoring of crankshaft position, throttle angle, and intake air temperature in gasoline engine management systems.

IC Role / Device Role / Timing Role: Primary MCU executing fuel injection timing, spark advance calculation, and OBD-II diagnostics via LIN interface.

Use Value: 10-bit ADC with analog watchdog ensures closed-loop feedback integrity; 150 °C rating allows placement near engine block without heatsinking.

Use Scenario: Centralized control of door locks, window lifts, interior lighting, and mirror adjustment in premium vehicle platforms.

IC Role / Device Role / Timing Role: LIN slave node coordinating with central gateway; handles local actuator drivers and sensor polling via GPIO and ADC.

Use Value: Integrated LINUART eliminates external transceiver; high-sink I/Os directly drive solenoids and LEDs, reducing external component count by ≥4.

Transmission Control Unit (TCU)

Battery Management System (BMS) Sensor Node

Use Scenario: Gear selection logic, clutch pressure regulation, and torque converter lock-up control in automatic transmissions.

IC Role / Device Role / Timing Role: Real-time deterministic controller managing PWM-driven solenoid valves and reading transmission fluid temperature/pressure sensors.

Use Value: Advanced control timer (TIM1) generates synchronized complementary PWM with dead-time - prevents shoot-through in H-bridge valve drivers.

Use Scenario: Distributed voltage and temperature sensing across 12-cell lithium-ion battery packs in 48 V mild-hybrid systems.

IC Role / Device Role / Timing Role: Local sensor aggregator acquiring cell voltages via multiplexed ADC inputs and reporting via LIN to main BMS controller.

Use Value: 1 Kbyte EEPROM stores per-cell calibration offsets; 32 Kbyte Flash accommodates future OTA update capability for aging compensation algorithms.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STM8AF6246UDY	16 Kbyte Flash, 0.5 Kbyte EEPROM, same pinout and peripheral set; lower memory density.	Suitable for simpler LIN nodes with minimal firmware footprint (e.g., seat heater control) where 32 Kbyte is unnecessary.	Select when cost sensitivity outweighs future firmware scalability needs and memory headroom is not required.
RL78/F13	Renesas RL78 core, 24 MHz max, 32 Kbyte Flash, but no native LINPHY - requires external transceiver and additional GPIO routing.	Used in Japanese OEM infotainment sub-modules; lacks integrated LIN 2.2 resynchronization logic.	Prefer only if existing RL78 toolchain and ecosystem alignment justify added BOM and layout complexity.

Compared with STM8AF6266UDY, STM8AF6246UDY offers identical automotive qualification and interface compatibility at reduced memory cost, while RL78/F13 trades integrated LIN functionality for higher CPU speed and different ecosystem dependencies - making STM8AF6266UDY optimal for LIN-centric, space- and cost-constrained powertrain nodes.

Availability

STM8AF6266UDY is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control applications requiring stable component supply across extended automotive lifecycles.

Supply support for STM8AF6266UDY 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 ICs, sensors, and automotive-grade silicon for industrial and transportation markets.

The STM8A product line targets cost-sensitive, high-reliability automotive applications - delivering AEC-Q100 qualified 8-bit MCUs with integrated LIN, robust analog peripherals, and extended temperature operation for powertrain, chassis, and body electronics.

FAQ

Is STM8AF6266UDY pin-compatible with other STM8AF62xx devices in VFQFPN32 package?

Yes - STM8AF6266UDY shares identical VFQFPN32 pinout with STM8AF6246UDY, STM8AF6248UDY, and STM8AF6268UDY. All share the same peripheral mapping, I/O assignment, and power/ground pin locations, enabling drop-in replacement within the same memory variant family.

What debug interface does STM8AF6266UDY support, and what tools are required?

STM8AF6266UDY uses the Single-Wire Interface Module (SWIM) for debugging and programming. Required tools include ST-LINK/V2 or ST-LINK/V2-ISOL, compatible with STM8CubeIDE and COSMIC C compiler. No JTAG header or additional signals are needed - SWIM operates over a single dedicated pin (SWIM).

Does STM8AF6266UDY require an external crystal for LIN communication?

No - LIN 2.2 compliance is achieved using the internal 16 MHz HSI oscillator, which is factory-trimmed and user-adjustable. External crystal is optional and used only when higher clock precision is needed for synchronous peripherals like SPI or I²C in timing-critical subsystems.

How is flash programming handled during production programming or field updates?

Flash programming occurs via SWIM interface using standard ST programming protocols. The device supports block erase, byte/word write, and option byte configuration. Production programming uses ST's official Flash Loader Demonstrator or third-party gang programmers compatible with STM8 SWIM command set - no bootloader code is required.

STM8AF6266UDY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 32-VFQFN Exposed Pad

Series:: STM8A

Packaging:: Tray

Product Status:: Active

Programmable:: Not Verified

Core Processor:: STM8A

Core Size:: 8-Bit

Speed:: 16MHz

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

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

Number of I/O:: 25

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

Program Memory Type:: FLASH

EEPROM Size:: 1K x 8

RAM Size:: 2K x 8

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

Data Converters:: A/D 7x10b

Oscillator Type:: Internal

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:

STM8AF6266UDY FAQ

1.How can I place an order for STM8AF6266UDY through Aetrix?

Please submit a Request for Quotation (RFQ) for STM8AF6266UDY 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 STM8AF6266UDY reliable?

The price and inventory of STM8AF6266UDY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6266UDY is usually 5 days.

3.What payment methods are accepted for STM8AF6266UDY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6266UDY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM8AF6266UDY?

STM8AF6266UDY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM8AF6266UDY 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 STM8AF6266UDY?

For technical support, including STM8AF6266UDY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6266UDY requirements.

6.How does Aetrix verify that STM8AF6266UDY is sourced from the original manufacturer or authorized distributors?

All STM8AF6266UDY 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 STM8AF6266UDY meets industry standards.

7.What is the process for return or replacement of STM8AF6266UDY?

All STM8AF6266UDY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6266UDY, 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 STM8AF6266UDY part is unused and in its original packaging.

Return procedure for STM8AF6266UDY:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…