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STMicroelectronics STM8AL3146TAY
- Part No.:
- STM8AL3146TAY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8AL3146TAY.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,242
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Product details
Overview
STM8AL3146TAY from STMicroelectronics is an AEC-Q100 qualified automotive-grade 8-bit ultra-low-power microcontroller featuring 16 MHz STM8 core, 32 Kbyte Flash, 2 Kbyte RAM, 1 Kbyte data EEPROM, RTC, 12-bit ADC (25 channels, 1 Mbps), 12-bit DAC, two ultra-low-power comparators, LCD controller (4×28 segments), and multiple communication interfaces including USART, I²C, and SPI. It targets battery-powered automotive body electronics such as smart sensors and dashboard modules.
For engineers reviewing the STM8AL3146TAY datasheet, STM8AL3146TAY pinout, STM8AL3146TAY application, or STM8AL3146TAY equivalent, this page delivers verified technical context, low-power mode timing, peripheral integration details, and validated automotive-grade alternatives - all grounded in DS7106 Rev 9 production data.
Technical Context
The STM8AL3146TAY implements a Harvard-architecture STM8 core with 3-stage pipeline, supporting up to 16 MHz operation (16 CISC MIPS peak) and 40 external interrupt sources. Its clock system integrates dual crystal oscillators (1–16 MHz HSE, 32 kHz LSE), factory-trimmed 16 MHz RC, and 38 kHz low-consumption RC with clock security system.
Power management includes five low-power modes: Wait (typ. 5.1 μA), low-power Wait (3 μA), active-halt with full RTC (1.3 μA), and Halt with PDR (400 nA). RTC operates with 0.95 ppm resolution and auto-wakeup capability, while I/O leakage is limited to 50 nA per pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Harvard, 3-stage pipeline STM8 CPU; enables deterministic real-time execution and efficient code density for resource-constrained automotive nodes. |
| Max Clock Frequency | 16 MHz (16 CISC MIPS peak); sufficient for LIN 2.0, sensor fusion, and basic motor control without external clocking complexity. |
| Flash / EEPROM / RAM | 32 Kbyte Flash (20-year retention at 55 °C), 1 Kbyte true data EEPROM (300 kcycle endurance), 2 Kbyte RAM; supports field firmware updates and persistent calibration storage. |
| ADC / DAC | 12-bit ADC (25 channels, 1 Mbps sampling, internal temp sensor & Vref), 12-bit DAC with output buffer; enables high-resolution analog sensing and precise actuator biasing. |
| Low-Power Halt Current | 400 nA with PDR enabled; allows multi-year battery operation in always-on vehicle monitoring applications like door module wake-on-event. |
| Operating Voltage Range | 1.8 V to 3.6 V (down to 1.65 V in power-down); compatible with automotive 3.3 V domains and brown-out resilient under cold-crank conditions. |
| Temperature Range | -40 °C to 125 °C; qualified for under-hood and cabin-mounted automotive ECUs per AEC-Q100 Grade 0. |
Pinout & Package
LQFP32 package (7 × 7 mm, 0.8 mm pitch), RoHS-compliant, ECOPACK® certified. Pin count and function mapping align with STM8AL31x6T variant per DS7106 Figure 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core and I/O domain decoupling; supports independent noise filtering for analog peripherals. |
| NRST | Active-low reset input | Accepts external reset with programmable BOR thresholds (5 levels); enables robust recovery during voltage transients. |
| SWIM | Single-wire interface for debug/programming | Enables non-intrusive on-chip debugging and fast flash programming without dedicated JTAG pins. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7 | General-purpose I/Os | Up to 41 mappable I/Os with interrupt capability; PA0 supports high-sink LED driver (20 mA), enabling direct segment driving in LCD applications. |
| OSC_IN / OSC_OUT | HSE crystal oscillator terminals | Supports 1–16 MHz external crystals; used for precise timing in LIN/USART or RTC synchronization. |
| LSE_IN / LSE_OUT | LSE crystal oscillator terminals | 32 kHz crystal connection for RTC calendar and ultra-low-power wakeup; maintains timekeeping in Halt mode. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power RTC | BCD calendar with alarm interrupt and 0.95 ppm resolution; enables accurate timestamping and periodic wake-up from Halt with <1.3 μA current draw. |
| Two rail-to-rail comparators | One with fixed threshold, one with adjustable reference; both support wakeup-from-Halt, enabling battery voltage monitoring and intrusion detection. |
| Advanced timer set | Includes TIM1 (16-bit advanced control timer, 3-channel, motor control ready), two 16-bit general-purpose timers, and beeper timer (1/2/4 kHz); supports PWM generation, quadrature decoding, and audible alerts. |
| Communication flexibility | USART with ISO 7816, IrDA, LIN 1.3/2.0; Fast I²C (400 kHz SMBus/PMBus); SPI; enables interoperability with smart sensors, CAN gateways, and diagnostic tools. |
| Memory safety | 96-bit unique ID, option byte protection, and memory readout protection (RDP); prevents unauthorized firmware extraction in OEM deployments. |
Applications
| Automotive Door Module | Smart HVAC Sensor Node |
|---|---|
|
Use Scenario: Real-time monitoring of window position, lock status, and ambient temperature in vehicle door assemblies. IC Role / Device Role: Central MCU managing GPIO interrupts, ADC-based thermistor readings, LIN 2.0 communication, and low-power wake-on-event via comparators. Use Value: 400 nA Halt current extends battery life in keyless entry systems; integrated RTC enables timed diagnostics without external timing components. |
Use Scenario: Compact, battery-operated air quality and temperature/humidity sensing node inside vehicle cabin ducts. IC Role / Device Role: Sensor aggregator running ADC conversions, I²C interfacing with digital sensors, and UART reporting to main ECU. Use Value: 3 μA low-power Wait mode minimizes energy use between 10-second measurement cycles; 1 Kbyte EEPROM stores calibration offsets across power cycles. |
| Dashboard LCD Driver | Body Control Unit Subnode |
|
Use Scenario: Driving 4×28-segment LCD display for fuel level, gear indicator, and warning icons in analog-style instrument clusters. IC Role / Device Role: Integrated LCD controller with step-up converter, managing segment bias and contrast without external charge pump. Use Value: Eliminates external LCD driver IC and associated passive components; reduces BOM cost and PCB area by ~35% versus discrete solutions. |
Use Scenario: Secondary control node for interior lighting dimming, mirror adjustment, and seat position memory in mid-tier vehicles. IC Role / Device Role: Executes PWM-driven LED dimming, stores user preferences in EEPROM, and communicates via LIN to master BCM. Use Value: 12-bit DAC provides smooth 4096-step brightness control; 32 Kbyte Flash accommodates future OTA update capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power automotive MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8L152C6T6 | No AEC-Q100 qualification; 128-byte EEPROM only; no LCD controller; max 12 MHz clock. | Suitable for non-automotive industrial sensors where qualification and display are not required. | Select when cost sensitivity outweighs automotive compliance and display integration needs. |
| RL78/F13 | Renesas RL78 core; 24 MHz max; 32 Kbyte Flash; no integrated LCD driver; different debug interface (FSL). | Preferred in Japanese OEM supply chains requiring Renesas ecosystem compatibility and higher clock headroom. | Choose when existing toolchain alignment or regional sourcing mandates Renesas architecture. |
Compared with STM8AL3146TAY, STM8L152C6T6 lacks automotive qualification and display capability but offers lower unit cost for non-automotive use, while RL78/F13 provides higher performance and ecosystem support at the expense of pin- and software-incompatibility.
Availability
STM8AL3146TAY is available at Aetrix Electronics and suitable for automotive body electronics, battery-powered sensor nodes, and dashboard display subsystems requiring stable component supply across extended product lifecycles.
Supply support for STM8AL3146TAY 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, delivering automotive, industrial, and power management solutions with vertical manufacturing capabilities and AEC-Q100-aligned quality systems.
The STM8AL3x series is designed specifically for ultra-low-power automotive applications demanding extended battery life, high reliability at 125 °C, and integrated peripherals to minimize external component count in space-constrained ECUs.
FAQ
What is the maximum operating temperature for STM8AL3146TAY?
The STM8AL3146TAY is rated for -40 °C to +125 °C operation and is AEC-Q100 Grade 0 qualified. This rating is validated per DS7106 Rev 9 Section 9.3.1 and applies across the full 1.65 V to 3.6 V supply range, making it suitable for under-hood and cabin-mounted automotive locations.
Does STM8AL3146TAY support LIN 2.0 communication?
Yes, the integrated USART supports LIN 2.0 physical layer compliance per DS7106 Rev 9 Section 3.16.3. It includes automatic sync-break detection, checksum handling, and configurable baud rates down to 1.2 kbps, enabling direct connection to LIN transceivers without external protocol acceleration.
How many I/O pins support external interrupt capability?
All 41 GPIOs are mappable to interrupt vectors, as confirmed in DS7106 Rev 9 Section 3.2.2 and Table 5. Each port pin can generate edge-triggered interrupts independently, allowing flexible wake-up sources for door switches, sensor triggers, or button presses in automotive modules.
Is the 12-bit DAC output buffered and rail-to-rail?
Yes, the integrated 12-bit DAC features an output buffer with rail-to-rail capability, as specified in DS7106 Rev 9 Section 3.10 and Table 53. It drives loads up to 100 pF with monotonicity guaranteed and supports output on PB4–PB6 pins, enabling direct interface to op-amp inputs or analog actuators.
STM8AL3146TAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- STM8A
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, IrDA, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, POR, PWM, WDT
- Number of I/O:
- 30
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 1K x 8
- RAM Size:
- 2K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.65V ~ 3.6V
- Data Converters:
- A/D 22x12b; D/A 1x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AL3146TAY FAQ
1.How can I place an order for STM8AL3146TAY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AL3146TAY 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 STM8AL3146TAY reliable?
The price and inventory of STM8AL3146TAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AL3146TAY is usually 5 days.
3.What payment methods are accepted for STM8AL3146TAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AL3146TAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AL3146TAY?
STM8AL3146TAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AL3146TAY 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 STM8AL3146TAY?
For technical support, including STM8AL3146TAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AL3146TAY requirements.
6.How does Aetrix verify that STM8AL3146TAY is sourced from the original manufacturer or authorized distributors?
All STM8AL3146TAY 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 STM8AL3146TAY meets industry standards.
7.What is the process for return or replacement of STM8AL3146TAY?
All STM8AL3146TAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AL3146TAY, 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 STM8AL3146TAY part is unused and in its original packaging.
Return procedure for STM8AL3146TAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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