STM8AL3146TAY - 8-bit Ultra-Low-Power MCU, 32KB Flash | STMicroelectronics
MPN: STM8AL3146TAY β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.25 | $3.25 |
| 10 | $2.92 | $29.20 |
| 100 | $2.6 | $260.00 |
| 500 | $2.34 | $1,170.00 |
| 1,000 | $2.08 | $2,080.00 |
Drop-in alternatives for STM8AL3146TAY β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
STM8AL3148TAY
β Drop-Inπ Reference alternative (not in catalog)
STM8AL3146TAX
β Drop-Inπ Reference alternative (not in catalog)
STM8L151C6T6
β‘ Same Packageπ Reference alternative (not in catalog)
STM8AL3146TAY Maximum Ratings & Electrical Characteristics
| Core | STM8A 8-bit |
| Maximum Clock Frequency | 16 MHz |
| Flash Memory | 32 KB |
| RAM | 2 KB |
| EEPROM | 1 KB |
| Supply Voltage | 1.8 V to 3.6 V |
| Package | LQFP-48 |
| Operating Temperature | -40C to +125C |
| ADC | 12-bit, up to 16 channels |
| Comparators | 2 |
| Timers | 16-bit timer, 16-bit low-power timer, watchdog |
| Communication Interfaces | SPI, I2C, UART |
| RTC | Yes |
| Low-Power Modes | Wait, Active-Halt, Halt |
| Halt Mode Current | 0.6 Β΅A (typical) |
| Debug Interface | SWIM (single-wire) |
| RoHS Status | Compliant |
STM8AL3146TAY Pin Configuration
| Pin 1 | VSS β Ground |
| Pin 2 | VDD β Power supply |
| Pin 3 | PA0 β General purpose I/O, ADC input |
| Pin 4 | PA1 β General purpose I/O, ADC input |
| Pin 5 | PA2 β General purpose I/O, ADC input |
| Pin 6 | PA3 β General purpose I/O, ADC input |
| Pin 7 | NRST β Reset (active low) |
| Pin 8 | PA4 β General purpose I/O, ADC input |
| Pin 9 | PA5 β General purpose I/O, ADC input |
| Pin 10 | PA6 β General purpose I/O, ADC input |
| Pin 11 | PA7 β General purpose I/O, ADC input |
| Pin 12 | VSS β Ground |
| Pin 13 | VDD β Power supply |
| Pin 14 | PB0 β General purpose I/O |
| Pin 15 | PB1 β General purpose I/O |
| Pin 16 | PB2 β General purpose I/O |
| Pin 17 | PB3 β General purpose I/O |
| Pin 18 | PB4 β General purpose I/O |
| Pin 19 | PB5 β General purpose I/O |
| Pin 20 | PB6 β General purpose I/O |
| Pin 21 | PB7 β General purpose I/O |
| Pin 22 | VSS β Ground |
| Pin 23 | VDD β Power supply |
| Pin 24 | PC0 β General purpose I/O |
| Pin 25 | PC1 β General purpose I/O |
| Pin 26 | PC2 β General purpose I/O |
| Pin 27 | PC3 β General purpose I/O |
| Pin 28 | PC4 β General purpose I/O |
| Pin 29 | PC5 β General purpose I/O |
| Pin 30 | PC6 β General purpose I/O |
| Pin 31 | PC7 β General purpose I/O |
| Pin 32 | VSS β Ground |
| Pin 33 | VDD β Power supply |
| Pin 34 | PD0 β General purpose I/O |
| Pin 35 | PD1 β General purpose I/O |
| Pin 36 | PD2 β General purpose I/O |
| Pin 37 | PD3 β General purpose I/O |
| Pin 38 | PD4 β General purpose I/O |
| Pin 39 | PD5 β General purpose I/O |
| Pin 40 | PD6 β General purpose I/O |
| Pin 41 | PD7 β General purpose I/O |
| Pin 42 | VSS β Ground |
| Pin 43 | VDD β Power supply |
| Pin 44 | PE0 β General purpose I/O |
| Pin 45 | PE1 β General purpose I/O |
| Pin 46 | PE2 β General purpose I/O |
| Pin 47 | PE3 β General purpose I/O |
| Pin 48 | PE4 β General purpose I/O |
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, Building Automation, Battery-Powered IoT Devices.
Automotive Body Electronics
The STM8AL3146TAY is ideal for automotive body electronics such as window lift, lighting control, and seat adjustment modules. Its wide operating temperature range (-40Β°C to +125Β°C) and AEC-Q100 qualification ensure reliable operation in harsh automotive environments. The 12-bit ADC and multiple timers enable precise control of motors and actuators. The low-power modes reduce current draw when the vehicle is off, preserving battery life. Communication interfaces like LIN (via UART) allow integration into the vehicle's body control network. The 32 KB Flash is sufficient for body control firmware, and the EEPROM stores calibration data and fault codes. The STM8A core provides deterministic real-time performance for safety-critical functions. Overall, the STM8AL3146TAY offers a cost-effective solution for automotive body electronics with high reliability and low power consumption.
Recommended
Industrial Sensors
In industrial sensor applications, the STM8AL3146TAY excels due to its ultra-low-power consumption and integrated analog peripherals. The 12-bit ADC with up to 16 channels can directly interface with various analog sensors (temperature, pressure, humidity). The two comparators enable threshold detection without waking the CPU, reducing power consumption. The RTC allows periodic wake-up for data logging, and the UART/SPI/I2C interfaces transmit data to a central controller. The wide temperature range ensures operation in factory environments. The 32 KB Flash stores calibration and configuration data, while the EEPROM retains settings across power cycles. The low-power Halt mode (0.6 Β΅A) extends battery life in wireless sensor nodes. The STM8A core's robust instruction set handles sensor fusion algorithms efficiently. This MCU is a reliable choice for industrial sensors requiring long-term deployment and minimal maintenance.
Recommended
Smart Meters
The STM8AL3146TAY is well-suited for smart metering applications (electricity, water, gas) due to its low power consumption and integrated RTC. The RTC provides accurate time-stamping for consumption data, and the low-power modes allow the meter to run on battery for years. The 12-bit ADC measures analog sensor outputs (e.g., current transformers) with high resolution. The UART interface communicates with a communication module (e.g., PLC, RF) for remote reading. The 32 KB Flash stores metering firmware and tariff tables, while the EEPROM retains consumption data and calibration constants. The wide temperature range ensures operation in outdoor environments. The STM8A core's efficient instruction set handles metering algorithms (e.g., RMS calculation) in real-time. The STM8AL3146TAY offers a cost-effective, reliable solution for smart meters, meeting regulatory requirements for accuracy and long-term stability.
Recommended
Portable Medical Devices
The STM8AL3146TAY is ideal for portable medical devices such as glucose meters, pulse oximeters, and wearable health monitors. Its ultra-low-power consumption (0.6 Β΅A in Halt mode) extends battery life, crucial for patient convenience. The 12-bit ADC accurately reads sensor signals (e.g., photodiode, thermistor). The comparators can trigger alarms when vital signs exceed thresholds. The I2C interface connects to external sensors and displays. The RTC enables time-stamped data logging for trend analysis. The 32 KB Flash stores firmware for signal processing algorithms, and the EEPROM stores patient data and calibration settings. The wide operating temperature range ensures reliable operation in various environments. The STM8A core's deterministic timing is essential for real-time signal processing. The STM8AL3146TAY provides a compact, low-power solution for portable medical devices, improving patient outcomes through continuous monitoring.
Recommended
Building Automation
In building automation, the STM8AL3146TAY is used in HVAC controllers, lighting control, and occupancy sensors. Its low power consumption allows battery-powered wireless sensors. The 12-bit ADC interfaces with temperature, humidity, and light sensors. The UART/SPI/I2C interfaces connect to communication modules (e.g., Zigbee, EnOcean) for building management systems. The RTC schedules daily operations, and the low-power modes reduce energy consumption during idle periods. The 32 KB Flash stores control algorithms, and the EEPROM retains user settings. The wide temperature range suits installation in walls, ceilings, and mechanical rooms. The STM8A core's reliability ensures long-term operation without maintenance. The STM8AL3146TAY enables energy-efficient building automation, reducing operational costs and environmental impact.
Recommended
Battery-Powered IoT Devices
The STM8AL3146TAY is an excellent choice for battery-powered IoT devices such as wireless sensor nodes, asset trackers, and environmental monitors. Its ultra-low-power modes (Halt: 0.6 Β΅A) enable years of operation on a single coin cell. The 12-bit ADC reads various sensors, and the UART/SPI/I2C interfaces connect to RF modules (e.g., LoRa, BLE). The RTC allows scheduled wake-up for periodic data transmission, minimizing power consumption. The 32 KB Flash stores firmware for sensor data processing and communication protocols. The EEPROM stores device configuration and sensor calibration. The wide temperature range ensures operation in outdoor environments. The STM8A core's efficient instruction set handles protocol stacks with low overhead. The STM8AL3146TAY provides a cost-effective, reliable platform for IoT devices, enabling long-term deployment with minimal maintenance.
Recommended
Recommended Products Summary
Engineering reference data for STM8AL3146TAY β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM8AL3148TAY | STM8AL3146TCY | STM8AL3146TAX | STM8L151C6T6 | S9KEAZN32ACLC |
|---|---|---|---|---|---|---|
| Package | LQFP-48 | LQFP-48 (same) | LQFP-64 (different) | LQFP-48 (same) | LQFP-48 (same) | LQFP-32 (different) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | NXP Semiconductors |
| Flash Memory | 32 KB | 64 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| RAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 20 MHz |
| Supply Voltage | 1.8V to 3.6V | 1.8V to 3.6V | 1.8V to 3.6V | 1.8V to 3.6V | 1.8V to 3.6V | 2.7V to 5.5V |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +125C |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| Automotive Grade | Yes (AEC-Q100) | Yes (AEC-Q100) | Yes (AEC-Q100) | No | No | Yes (AEC-Q100) |
Key Differentiators
- Automotive-grade qualification (AEC-Q100) (vs STM8L151C6T6)
- Wider operating temperature range (-40Β°C to +125Β°C) (vs STM8AL3146TAX)
- Ultra-low-power Halt mode (0.6 Β΅A) (vs S9KEAZN32ACLC)
Design Notes
The STM8AL3146TAY operates from 1.8V to 3.6V. For battery-powered applications, use a low-dropout regulator (LDO) to provide a stable supply voltage. Place a 100 nF ceramic capacitor close to each VDD pin and a 1 Β΅F capacitor at the main supply input to filter high-frequency noise. In low-power modes, ensure the supply voltage remains within the specified range to avoid data corruption.
For the LQFP-48 package, ensure proper PCB layout with a solid ground plane. Place decoupling capacitors as close as possible to the VDD and VSS pins. Use a 4-layer PCB with dedicated power and ground planes to minimize noise and improve EMC performance. Follow the layout guidelines in the STM8AL3146 datasheet for optimal performance.
A common pitfall is neglecting the SWIM debug interface. Ensure the SWIM pin is accessible for programming and debugging. Also, avoid exceeding the absolute maximum ratings for supply voltage and I/O pins. When using the ADC, ensure the reference voltage is stable and bypassed with a capacitor. For low-power operation, configure unused I/O pins as analog inputs or outputs to avoid floating inputs that increase current consumption.
Compliance Information
RoHS compliant per STMicroelectronics product page. AEC-Q100 qualified for automotive applications.
