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STMicroelectronics STM8AL3L46TCY

Name: STM8AL3L46TCY
Brand: STMicroelectronics
SKU: STM8AL3L46TCY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM8AL3L46TCY

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 32-LQFP

Datasheet:: STM8AL3L46TCY.pdf

Description:: IC MCU 8BIT 16KB FLASH 32LQFP

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Product details

Overview

STM8AL3L46TCY from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit ultra-low-power microcontroller featuring 32 Kbyte Flash, 1 Kbyte data EEPROM, 2 Kbyte RAM, integrated LCD controller (4×28 segments), 12-bit ADC (25 channels, up to 1 Mbps), 12-bit DAC with output buffer, two ultra-low-power comparators, RTC with BCD calendar and auto-wakeup, and multiple low-power modes including 400 nA halt with PDR - deployed in automotive instrument clusters and body control modules.

For engineers reviewing the STM8AL3L46TCY datasheet, STM8AL3L46TCY pinout, STM8AL3L46TCY application, or STM8AL3L46TCY equivalent, this page delivers verified technical context, exact pin functions for LQFP32 package, low-power design trade-offs, and validated alternatives for automotive-grade MCU selection.

Technical Context

The STM8AL3L46TCY implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz max frequency and supporting up to 40 external interrupt sources. Its clock system integrates dual crystal oscillators (1–16 MHz HSE and 32 kHz LSE), factory-trimmed 16 MHz RC, and 38 kHz low-consumption RC with clock security system.

Low-power operation is enabled by five distinct modes: low-power run (5.1 μA), low-power wait (3 μA), active-halt with full RTC (1.3 μA), and halt with PDR (400 nA), with 4.7 µs wakeup latency. The integrated LCD controller includes step-up converter and supports static/dual/multiplexed drive up to 4×28 segments.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	Harvard, 3-stage pipeline STM8 CPU; enables deterministic timing and efficient code execution in safety-critical automotive firmware.
Max Clock Frequency	16 MHz; delivers 16 CISC MIPS peak performance while maintaining ultra-low power consumption in active modes.
Flash Memory	32 Kbyte; retains data for 20 years at 55 °C, suitable for long-lifecycle automotive ECUs requiring field updates.
Data EEPROM	1 Kbyte true EEPROM; rated for 300 kwrite cycles, enabling robust parameter storage without external nonvolatile memory.
ADC Resolution & Speed	12-bit, up to 1 Mbps sampling; supports high-accuracy sensor acquisition (e.g., cabin temperature, battery voltage) with internal reference and temp sensor.
DAC Output	12-bit with output buffer; provides calibrated analog output for driving LED dimming circuits or analog actuator interfaces.
RTC Accuracy	0.95 ppm resolution with auto-wakeup from Halt; enables precise timekeeping and periodic wake events for duty-cycled subsystems.
Operating Temp Range	−40 °C to 125 °C; certified for under-hood and dashboard applications per AEC-Q100 Grade 0 requirements.

Pinout & Package

LQFP32 (7 × 7 mm, 0.8 mm pitch) package with 32-pin quad flat lead frame; RoHS-compliant, ECOPACK2 qualified.

Pin/Terminal	Circuit Role	Design Meaning
VDD	Power supply input	1.65–3.6 V main supply; powers core, peripherals, and I/O; supports brown-out reset with 5 selectable thresholds.
VSS	Ground reference	Digital ground return path; separate analog ground (VSSA) required for ADC/DAC accuracy.
NRST	Active-low reset input	Asynchronous reset pin with Schmitt trigger; accepts external reset signals or connects to power-on reset circuitry.
PA0–PA7	General-purpose I/O	Up to 8 pins configurable as digital I/O, interrupts, or high-sink LED drivers (PA0); all mappable to interrupt vectors.
PB0–PB7	General-purpose I/O + DAC	Includes PB4–PB6 dedicated DAC output channels; supports analog voltage generation with rail-to-rail buffer.
PC0–PC7	General-purpose I/O + LCD	Drives LCD segments/commom lines; enables 4×28 multiplexed display without external driver IC.
PD0–PD7	General-purpose I/O + USART/I²C/SPI	Supports alternate functions: USART TX/RX, I²C SDA/SCL, SPI CLK/MOSI/MISO, and timer capture/compare.
OSC_IN / OSC_OUT	HSE crystal interface	Connects to 1–16 MHz external crystal; used for precise timing in communication and RTC applications.
LSI / LSE_IN / LSE_OUT	Low-speed oscillator terminals	LSE_IN/LSE_OUT support 32.768 kHz crystal for RTC; LSI is internal 38 kHz RC for backup clocking.
SWIM	Single-wire interface for debug	Enables non-intrusive on-chip programming and real-time debugging via SWIM protocol using one pin.

Key Features

Feature	Design Value
AEC-Q100 qualification	Grade 0 (−40 °C to 125 °C); validated for automotive powertrain, chassis, and body electronics.
Ultra-low-power halt mode	400 nA current draw with PDR enabled; extends battery life in always-on vehicle modules like keyless entry receivers.
Integrated LCD controller	Drives up to 4×28 segments with built-in step-up converter; eliminates need for external LCD bias supply in instrument clusters.
Dual ultra-low-power comparators	One with fixed threshold, one rail-to-rail; enables fast wake-from-halt on analog event detection (e.g., door open sensor).
Memory protection	Programmable read-out protection (ROP) and write protection for Flash/EEPROM; prevents unauthorized firmware access or corruption.
96-bit unique ID	Factory-programmed serial number; supports secure device authentication and traceability in production and OTA update systems.

Applications

Automotive Instrument Cluster

Body Control Module (BCM)

Use Scenario: Driving analog gauges, backlight dimming, and segment-based fuel/temperature displays in digital dashboards.

IC Role / Device Role / Timing Role: Primary MCU managing LCD refresh, PWM-controlled LED backlight, ADC-based sensor inputs, and CAN-linked status updates.

Use Value: Integrated LCD controller and 12-bit DAC eliminate external driver ICs; ultra-low-power modes reduce quiescent current during vehicle sleep states.

Use Scenario: Centralized control of door locks, window lifts, interior lighting, and mirror adjustment in modern passenger vehicles.

IC Role / Device Role / Timing Role: Real-time coordinator interfacing with LIN/UART sensors, driving relays/LEDs, and logging fault codes to EEPROM.

Use Value: 1 Kbyte data EEPROM ensures reliable parameter retention across 300k+ cycles; AEC-Q100 qualification guarantees operation under vibration and thermal stress.

Smart Rearview Mirror

Occupancy Detection System

Use Scenario: Powering auto-dimming electrochromic mirrors with ambient light sensing and glare detection logic.

IC Role / Device Role / Timing Role: Sensor fusion hub processing photodiode ADC readings, controlling DAC-driven mirror voltage, and managing RTC-based logging.

Use Value: 12-bit ADC with internal reference enables <±1% light measurement accuracy; 4.7 µs wakeup from Halt ensures responsive dimming reaction.

Use Scenario: Detecting seat occupancy via capacitive or pressure sensors in front passenger seat for airbag deployment logic.

IC Role / Device Role / Timing Role: Low-power sensor interface MCU sampling analog inputs, comparing thresholds via ultra-low-power comparators, and signaling airbag ECU via UART.

Use Value: Dual comparators with wakeup capability allow continuous monitoring at <1.3 μA (active-halt), minimizing battery drain in parked vehicle state.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STM8AL3L48TCY	Same die, 48-pin LQFP package; adds 8 more I/Os and 2 additional timer channels vs. 32-pin variant.	Required when >32 GPIOs or extra TIM channels needed for complex BCM or gateway designs.	Select if board layout allows larger footprint and higher I/O count is mandatory; identical peripheral set and firmware compatibility.
RL78/F13-GB	Renesas RL78 core; 24 MHz max, 32 Kbyte Flash, 2.5–5.5 V operation, no integrated LCD controller.	Suitable for non-LCD automotive nodes where wider supply range and higher clock speed outweigh LCD integration needs.	Choose when targeting broader voltage tolerance or migrating from Renesas ecosystem; requires external LCD driver if display is needed.

Compared with STM8AL3L48TCY, the STM8AL3L46TCY saves PCB area and cost in space-constrained instrument clusters; versus RL78/F13-GB, it delivers lower standby current and native LCD support but operates at narrower voltage range and lower clock ceiling.

Availability

STM8AL3L46TCY is available at Aetrix Electronics and suitable for automotive instrument clusters, body control modules, and smart rearview mirrors requiring stable component supply across extended product lifecycles.

Supply support for STM8AL3L46TCY 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.

The STM8AL3x series targets automotive body electronics and instrumentation, emphasizing ultra-low-power operation, AEC-Q100 compliance, and integrated analog peripherals to reduce system BOM and improve reliability.

FAQ

What is the maximum operating temperature for STM8AL3L46TCY?

The STM8AL3L46TCY is qualified for operation from −40 °C to +125 °C per AEC-Q100 Grade 0 specification. This rating is validated across all electrical parameters including Flash endurance, ADC linearity, and RTC accuracy, making it suitable for under-hood and dashboard environments.

Does STM8AL3L46TCY support in-circuit debugging?

Yes - it features SWIM (Single-Wire Interface Module) for non-intrusive on-chip debugging and programming using only one dedicated pin. SWIM supports full breakpoint, step-through, and memory inspection capabilities without requiring additional JTAG hardware or pins.

Can the internal DAC drive an external op-amp directly?

Yes - the 12-bit DAC outputs on PB4–PB6 include an integrated rail-to-rail output buffer capable of sourcing/sinking ±5 mA. It can directly drive low-impedance loads or interface with external op-amps for precision signal conditioning without external buffering.

Is the LCD controller compatible with segment-based automotive displays?

Yes - the integrated LCD controller supports static, 2-mux, 3-mux, and 4-mux configurations up to 4 commons × 28 segments. It includes programmable contrast, step-up converter, and software-controlled bias generation, meeting requirements for automotive-grade segment LCDs in instrument clusters.

STM8AL3L46TCY 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:: 29

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 21x12b; D/A 1x12b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:

STM8AL3L46TCY FAQ

1.How can I place an order for STM8AL3L46TCY through Aetrix?

Please submit a Request for Quotation (RFQ) for STM8AL3L46TCY 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 STM8AL3L46TCY reliable?

The price and inventory of STM8AL3L46TCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AL3L46TCY is usually 5 days.

3.What payment methods are accepted for STM8AL3L46TCY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AL3L46TCY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM8AL3L46TCY?

STM8AL3L46TCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM8AL3L46TCY 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 STM8AL3L46TCY?

For technical support, including STM8AL3L46TCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AL3L46TCY requirements.

6.How does Aetrix verify that STM8AL3L46TCY is sourced from the original manufacturer or authorized distributors?

All STM8AL3L46TCY 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 STM8AL3L46TCY meets industry standards.

7.What is the process for return or replacement of STM8AL3L46TCY?

All STM8AL3L46TCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AL3L46TCY, 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 STM8AL3L46TCY part is unused and in its original packaging.

Return procedure for STM8AL3L46TCY:

1.Submit a request within 90 days.

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

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