STM8AL3146TAY - 8-bit Ultra-Low-Power MCU, 16KB Flash | STMicroelectronics
MPN: STM8AL3146TAY ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.46 | $1,230.00 |
| 1,000 | $2.19 | $2,190.00 |
Drop-in alternatives for STM8AL3146TAY — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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STM8AL3146TAY
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View Datasheet →STM8AL3146TAY Maximum Ratings & Electrical Characteristics
| Core Processor | STM8A |
| Core Size | 8-Bit |
| Speed | 16 MHz |
| Program Memory Size | 16KB (16K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 2 KB |
| EEPROM Size | 1 KB |
| Number of I/O | 30 |
| Connectivity | I²C, IrDA, LINbus, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, DMA, POR, PWM, WDT |
| Operating Voltage | 1.8V to 3.6V |
| Operating Temperature | -40°C to +125°C |
| Package | 32-LQFP (7x7) |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 |
STM8AL3146TAY Pin Configuration
| Pin 1 | VDD — Power supply |
| Pin 2 | VSS — Ground |
| Pin 3 | PA0 — General purpose I/O or ADC input |
| Pin 4 | PA1 — General purpose I/O or ADC input |
| Pin 5 | PA2 — General purpose I/O or ADC input |
| Pin 6 | PA3 — General purpose I/O or ADC input |
| Pin 7 | NRST — Reset (active low) |
| Pin 8 | VSS — Ground |
| Pin 9 | VDD — Power supply |
| Pin 10 | PB0 — General purpose I/O or SPI clock |
| Pin 11 | PB1 — General purpose I/O or SPI MISO |
| Pin 12 | PB2 — General purpose I/O or SPI MOSI |
| Pin 13 | PB3 — General purpose I/O or SPI NSS |
| Pin 14 | PB4 — General purpose I/O or I2C SCL |
| Pin 15 | PB5 — General purpose I/O or I2C SDA |
| Pin 16 | VSS — Ground |
| Pin 17 | VDD — Power supply |
| Pin 18 | PC0 — General purpose I/O or UART TX |
| Pin 19 | PC1 — General purpose I/O or UART RX |
| Pin 20 | PC2 — General purpose I/O or timer input |
| Pin 21 | PC3 — General purpose I/O or timer output |
| Pin 22 | PC4 — General purpose I/O or ADC input |
| Pin 23 | PC5 — General purpose I/O or ADC input |
| Pin 24 | VSS — Ground |
| Pin 25 | VDD — Power supply |
| Pin 26 | PD0 — General purpose I/O or SWIM |
| Pin 27 | PD1 — General purpose I/O or timer input |
| Pin 28 | PD2 — General purpose I/O or timer output |
| Pin 29 | PD3 — General purpose I/O or ADC input |
| Pin 30 | PD4 — General purpose I/O or ADC input |
| Pin 31 | PD5 — General purpose I/O or ADC input |
| Pin 32 | PD6 — General purpose I/O or ADC input |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
STM8AL3146TAY is suitable for 6 applications: Automotive Body Electronics, Industrial Sensors, Smart Meters, Portable Medical Devices, Smart Home and IoT, Energy Harvesting Systems.
Automotive Body Electronics
The STM8AL3146TAY is ideal for automotive body electronics such as window lift, lighting control, and seat adjustment. Its AEC-Q100 qualification and wide operating temperature range of -40°C to +125°C ensure reliable operation in harsh automotive environments. The ultra-low-power modes extend battery life in always-on systems, while the 12-bit ADC and PWM peripherals enable precise control of motors and lighting. The LINbus interface supports communication with other vehicle modules, and the 16 MHz core provides sufficient processing power for real-time control loops. In a typical window lift application, the MCU reads switch inputs, controls the motor driver via PWM, and monitors current for anti-pinch detection. The brown-out reset and watchdog timer enhance system reliability, preventing erratic behavior during voltage dips. The 16 KB Flash memory is sufficient for the control firmware, and the EEPROM stores calibration data and fault codes. Overall, the STM8AL3146TAY offers a cost-effective, low-power solution for automotive body control modules.
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Industrial Sensors
The STM8AL3146TAY is well-suited for industrial sensors, including temperature, pressure, and flow sensors. Its 12-bit ADC with up to 16 channels allows direct interfacing with analog sensor elements, while the ultra-low-power modes enable battery-powered or loop-powered operation. The wide operating voltage range of 1.8V to 3.6V accommodates various power supply designs, and the -40°C to +125°C temperature range ensures operation in industrial environments. The I2C and SPI interfaces facilitate communication with external sensor signal conditioners or host controllers. In a typical pressure sensor application, the MCU reads the analog output of a pressure transducer, applies calibration coefficients stored in EEPROM, and transmits the digital value over UART or LIN. The DMA controller offloads data transfer, reducing CPU load and power consumption. The watchdog timer ensures reliable operation in unattended installations. The 16 KB Flash memory is sufficient for sensor firmware, and the 2 KB RAM handles data buffering. The STM8AL3146TAY's low power consumption extends battery life in wireless sensor nodes, making it a preferred choice for industrial IoT applications.
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Smart Meters
The STM8AL3146TAY is an excellent choice for smart meters, including electricity, water, and gas meters. Its ultra-low-power consumption, with Halt mode current as low as 0.6 µA, is critical for battery-powered meters that must operate for years without maintenance. The 12-bit ADC accurately measures analog signals from current and voltage sensors, while the RTC provides time-stamping for usage data. The UART and SPI interfaces enable communication with metering ICs and wireless modules for remote data collection. In a typical electricity meter, the MCU samples voltage and current waveforms, calculates energy consumption, and stores data in EEPROM. The low-power timer can wake the MCU periodically to perform measurements, minimizing average current draw. The wide operating temperature range ensures accurate metering in outdoor installations. The 16 KB Flash memory is sufficient for metering firmware, and the 2 KB RAM handles data processing. The STM8AL3146TAY's robust peripheral set and low power consumption make it a cost-effective solution for smart metering applications.
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Portable Medical Devices
The STM8AL3146TAY is suitable for portable medical devices such as glucose meters, pulse oximeters, and blood pressure monitors. Its ultra-low-power modes extend battery life, which is essential for handheld devices. The 12-bit ADC accurately processes signals from biosensors, and the I2C interface connects to external sensor ICs. The wide operating voltage range of 1.8V to 3.6V allows direct battery operation. In a typical glucose meter, the MCU reads the current from an electrochemical sensor, converts it to a glucose concentration, and displays the result on an LCD. The EEPROM stores patient data and calibration settings. The low-power timer can wake the MCU for periodic measurements, reducing power consumption. The -40°C to +125°C temperature range ensures operation in various environments. The 16 KB Flash memory is sufficient for the application firmware, and the 2 KB RAM handles data processing. The STM8AL3146TAY's low power consumption and integrated peripherals make it an ideal choice for portable medical devices.
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Smart Home and IoT
The STM8AL3146TAY is well-suited for smart home and IoT applications, including smart thermostats, lighting controls, and security sensors. Its ultra-low-power modes enable battery-powered operation for years, and the wide operating voltage range supports various power sources. The I2C, SPI, and UART interfaces allow connection to sensors, wireless modules, and actuators. In a typical smart thermostat, the MCU reads temperature and humidity sensors, controls the HVAC system via relays or PWM, and communicates with a central hub over UART or SPI. The RTC provides scheduling functionality, and the EEPROM stores user settings. The low-power timer can wake the MCU periodically to check sensor readings, minimizing power consumption. The -40°C to +125°C temperature range ensures operation in various home environments. The 16 KB Flash memory is sufficient for IoT firmware, and the 2 KB RAM handles data processing. The STM8AL3146TAY's low power consumption and integrated peripherals make it a cost-effective choice for smart home devices.
Recommended
Energy Harvesting Systems
The STM8AL3146TAY is ideal for energy harvesting systems, where power is scavenged from solar, thermal, or vibration sources. Its ultra-low-power consumption, with Halt mode current as low as 0.6 µA, is critical for systems that must operate with limited energy. The wide operating voltage range of 1.8V to 3.6V allows direct connection to energy harvesting power management ICs. In a typical solar-powered sensor node, the MCU wakes periodically to take measurements, process data, and transmit it wirelessly, then returns to Halt mode. The 12-bit ADC reads sensor outputs, and the UART or SPI interface connects to a wireless transceiver. The EEPROM stores calibration data and measurement logs. The low-power timer can wake the MCU at precise intervals, minimizing energy consumption. The -40°C to +125°C temperature range ensures operation in outdoor environments. The 16 KB Flash memory is sufficient for the firmware, and the 2 KB RAM handles data buffering. The STM8AL3146TAY's ultra-low-power features make it a preferred choice for energy harvesting applications.
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Recommended Products Summary
Engineering reference data for STM8AL3146TAY — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM8AL3146TAY | STM8AL3146TAY | STM8AL3146TAY |
|---|---|---|---|---|
| Package | 32-LQFP (7x7) | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Core | STM8A | STM8A | STM8A | STM8A |
| Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Flash Memory | 16 KB | 16 KB | 16 KB | 16 KB |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB |
| Operating Voltage | 1.8V to 3.6V | 1.8V to 3.6V | 1.8V to 3.6V | 1.8V to 3.6V |
Key Differentiators
- Ultra-low-power consumption with Halt mode current as low as 0.6 µA (vs STM8AL3146TAY)
- AEC-Q100 automotive qualification (vs STM8AL3146TAY)
- Wide operating temperature range of -40°C to +125°C (vs STM8AL3146TAY)
Design Notes
The STM8AL3146TAY operates from 1.8V to 3.6V. Use a 100 nF ceramic capacitor close to each VDD pin and a 1 µF capacitor at the main supply to ensure stable operation. For battery-powered designs, utilize the low-power modes (Wait, Active-Halt, Halt) to minimize average current consumption. In Halt mode, the current can be as low as 0.6 µA, extending battery life significantly.
For the 32-LQFP (7x7) package, ensure proper PCB layout with a solid ground plane and adequate decoupling. Place the decoupling capacitors as close to the VDD and VSS pins as possible to reduce noise. The SWIM debug interface pin (PD0) should be accessible for programming and debugging. Consider adding a test point for the SWIM signal.
Avoid exceeding the absolute maximum ratings, especially the supply voltage. Ensure the reset pin (NRST) is properly pulled up with a 100 nF capacitor to ground to prevent spurious resets. When using the ADC, ensure the reference voltage is stable and bypassed with a capacitor. The EEPROM has a limited write endurance (typically 300k cycles), so avoid excessive writes in firmware.
Compliance Information
AEC-Q100 qualified per datasheets.com. RoHS compliant per STMicroelectronics. Halogen-free status not specified in provided data.
