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STMicroelectronics STM8AF6246UDY
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- Part No.:
- STM8AF6246UDY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
STM8AF6246UDY.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:3,992
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Product details
Overview
STM8AF6246UDY from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 16 KB Flash, 1 KB data EEPROM, 10-bit ADC with 10 channels, LINUART, SPI, I²C, and operation up to 150 °C in VFQFPN32 (5×5 mm) package. It serves as a primary engine control or body electronics MCU in under-hood modules requiring high-temperature reliability and LIN bus integration.
For engineers reviewing the STM8AF6246UDY datasheet, STM8AF6246UDY pinout, STM8AF6246UDY application, or STM8AF6246UDY equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and analog performance metrics, and real-world substitution guidance for ECU redesign and BOM optimization.
Technical Context
The STM8AF6246UDY 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 user-trimmable 16 MHz HSI RC, 128 kHz LSI RC, and external crystal support with clock security monitoring.
Analog subsystem includes a 10-bit ADC with ±2 LSB total unadjusted error, scan mode, and analog watchdog; communication stack supports LIN 2.2-compliant UART with automatic resynchronization, SPI up to 8 Mbit/s, and I²C up to 400 kbit/s - all operating across –40 to +150 °C ambient.
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 safety-critical firmware. |
| Max Clock Frequency | 16 MHz fCPU; sustains full peripheral operation including ADC sampling and LIN transmission at junction temperature up to 150 °C. |
| Flash Memory | 16 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle; supports in-application programming for field updates. |
| Data EEPROM | 1 Kbyte true data EEPROM with 300 kcycle endurance; retains calibration data and fault logs without external backup. |
| ADC Resolution & Accuracy | 10-bit SAR ADC with ±2 LSB TUE and ±2 LSB linearity; meets ASAM MCD-2 MC requirements for sensor signal digitization in engine management. |
| LIN Interface | LINUART compliant with LIN 2.2 spec; supports master/slave modes with hardware auto-resync - eliminates software bit-banging overhead in body control networks. |
| Operating Temperature | –40 °C to +150 °C ambient; qualified per AEC-Q100 Grade 0; enables direct mounting on powertrain ECUs without heatsinking. |
| Supply Voltage Range | 3.0 V to 5.5 V; compatible with automotive battery transients and 5 V legacy sensor interfaces without level-shifting. |
Pinout & Package
VFQFPN32 (5 × 5 mm, 0.5 mm pitch) thermally enhanced package with exposed thermal pad; optimized for high-reliability automotive PCBs with constrained board area and thermal dissipation needs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 3.0–5.5 V supply rail; decoupled via 100 nF ceramic capacitor close to pin for EMC robustness in noisy engine bays. |
| VSS | Ground reference | Dedicated digital ground plane connection; separate from analog ground (VSSA) to minimize ADC noise coupling. |
| VDDA / VSSA | Analog power/ground | Isolated 3.0–5.5 V analog domain supply; enables stable 10-bit ADC conversion without digital switching noise interference. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts 1.2 V logic threshold and supports external watchdog assertion. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with HS capability; configurable as LINUART TX/RX, SPI SCK/MOSI/MISO, or ADC inputs CH0–CH7. |
| PB0–PB7 | General-purpose I/O port B | 8-bit port supporting TIM1/2/3/4 channel capture/compare, I²C SCL/SDA, and external interrupt sources INT0–INT3. |
| PC0–PC7 | General-purpose I/O port C | 8-bit port with SWIM debug interface pins (SWIM, RST); enables single-wire in-circuit programming and real-time debugging. |
| PD0–PD7 | General-purpose I/O port D | 8-bit port supporting advanced timer complementary outputs (TIM1_CH1–CH3), beeper output, and wakeup events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for continuous operation at 150 °C junction temperature - eliminates derating calculations for under-hood placement. |
| Single-wire interface module (SWIM) | Enables full debug, flash programming, and memory inspection using only one dedicated pin - reduces connector count in production test fixtures. |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion - directly drives 3-phase motor gate drivers without external logic. |
| Hardware LIN 2.2 support | On-chip LINUART with automatic baud rate resynchronization and checksum generation - ensures interoperability with legacy and new LIN slaves in mixed-network deployments. |
| Low-power modes with clock gating | Wait, Auto-wakeup, and Halt modes with per-peripheral clock enable/disable control - achieves sub-1 µA standby current while retaining RAM and register state. |
| True data EEPROM | 1 KB embedded EEPROM with 300 kcycle endurance and byte-level erase - stores adaptive learning parameters (e.g., throttle position offset) across vehicle lifetime without external NV memory. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of crankshaft position, throttle angle, and coolant temperature in gasoline direct injection systems. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop fuel injection and spark timing algorithms with <5 µs interrupt response to crank sensor edges. Use Value: 16 MHz deterministic execution and 10-bit ADC with analog watchdog ensure compliance with ISO 26262 ASIL-B timing and signal integrity requirements. |
Use Scenario: Centralized control of door locks, window lifters, interior lighting, and LIN-connected mirror modules. IC Role / Device Role / Timing Role: LIN master coordinating polling of slave nodes (e.g., seat control, HVAC actuators) with guaranteed frame scheduling and error recovery. Use Value: Integrated LINUART with hardware resync maintains network uptime during battery voltage dips common in start-stop systems. |
| Transmission Control Unit (TCU) | Electric Power Steering (EPS) |
Use Scenario: Gear selection logic, solenoid driver control, and CAN/LIN gateway between powertrain and chassis domains. IC Role / Device Role / Timing Role: Safety-monitoring co-processor interfacing with main TCU MCU via SPI, validating torque request signals before actuation. Use Value: Dual independent watchdog timers (window + independent) provide redundant fault detection aligned with ISO 26262 diagnostic coverage targets. |
Use Scenario: Torque assist calculation using motor current, steering angle, and vehicle speed inputs in compact EPS column modules. IC Role / Device Role / Timing Role: Motor phase controller generating PWM signals via TIM1 complementary outputs with 1 ns dead-time resolution. Use Value: 150 °C-rated VFQFPN32 package allows direct PCB mounting on motor housing - eliminating mechanical fasteners and thermal interface materials. |
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 |
|---|---|---|---|
| STM8AF6266UDY | 32 KB Flash, 2 KB RAM, same peripherals and package; higher memory for complex diagnostics and bootloader space. | Suitable for next-gen ECUs requiring OTA update capability and expanded CAN message buffering. | Select when firmware size exceeds 16 KB or dual-bank Flash for safe firmware swap is required. |
| RL78/F13 | Renesas RL78 core, 24 MHz max, 16 KB Flash, 1.25 KB RAM, LIN support; different instruction set and toolchain. | Used in Japanese OEM BCMs with existing RL78 software ecosystem and JTAG debug infrastructure. | Choose only if migrating from RL78 platform or leveraging Renesas' automotive functional safety libraries. |
Compared with STM8AF6246UDY, STM8AF6266UDY offers scalable memory without changing pinout or thermal design, while RL78/F13 requires full firmware rework but provides higher clock headroom and integrated CAN FD - making it relevant only for architecture-level redesigns.
Availability
STM8AF6246UDY 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 extended automotive lifecycles.
Supply support for STM8AF6246UDY 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 ASICs since 1987.
The STM8A family targets cost-sensitive, high-reliability automotive applications - specifically engine management, chassis control, and body electronics where AEC-Q100 Grade 0 operation and LIN/CAN integration are mandatory.
FAQ
What is the maximum junction temperature rating for STM8AF6246UDY?
The STM8AF6246UDY is qualified to AEC-Q100 Grade 0 with a maximum junction temperature of +150 °C. This is validated across all operating conditions including 5.5 V supply, 16 MHz CPU frequency, and full peripheral activation - enabling direct mounting on high-thermal-load engine components without forced cooling.
Does STM8AF6246UDY support in-system programming via SWIM?
Yes. The device features a Single-Wire Interface Module (SWIM) that supports full in-system programming, debugging, and memory inspection using only the SWIM pin and NRST. No external debugger hardware is required beyond a standard SWIM programmer such as ST-LINK/V2-1, and no boot ROM entry sequence is needed.
Can the 10-bit ADC operate accurately at 150 °C ambient?
Yes. Electrical characteristics tables in the datasheet (Section 10.3.11) specify ADC accuracy of ±2 LSB TUE and ±2 LSB linearity over the full –40 to +150 °C ambient range, with VDDA = 5.0 V. Performance is maintained without calibration compensation due to on-die temperature sensor and trimming circuitry.
Is the VFQFPN32 package RoHS and REACH compliant?
Yes. The VFQFPN32 package for STM8AF6246UDY meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with lead-free matte tin finish and halogen-free molding compound. Full compliance documentation is available in ST's official product change notifications (PCNs) and material declarations.
STM8AF6246UDY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-VFQFN Exposed Pad
- Series:
- STM8A
- Packaging:
- Tape & Reel (TR)
- 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:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 512 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:
STM8AF6246UDY FAQ
1.How can I place an order for STM8AF6246UDY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6246UDY 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 STM8AF6246UDY reliable?
The price and inventory of STM8AF6246UDY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6246UDY is usually 5 days.
3.What payment methods are accepted for STM8AF6246UDY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6246UDY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6246UDY?
STM8AF6246UDY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6246UDY 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 STM8AF6246UDY?
For technical support, including STM8AF6246UDY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6246UDY requirements.
6.How does Aetrix verify that STM8AF6246UDY is sourced from the original manufacturer or authorized distributors?
All STM8AF6246UDY 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 STM8AF6246UDY meets industry standards.
7.What is the process for return or replacement of STM8AF6246UDY?
All STM8AF6246UDY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6246UDY, 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 STM8AF6246UDY part is unused and in its original packaging.
Return procedure for STM8AF6246UDY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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