STM32L021K4T7 STMicroelectronics Integrated Circuit (Quad Flat Packages) In Stock
STMicroelectronics STM32L021K4T7 is an ultra-low-power 32-bit ARM Cortex-M0+ microcontroller running up to 32 MHz with 16 KB Flash, 2 KB SRAM, 512 B EEPROM, ADC, and AES hardware encryption. Its LQFP-32 package provides 26 I/O lines for compact IoT sensor and wearable applications. Available from stock with worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Quad Flat Packages
- Pin Count
- 32
- Lifecycle
- ACTIVE
- Datasheet
- STM32L021K4T7 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Ultra-low-power ARM Cortex-M0+ core at up to 32 MHz enabling battery-operated IoT and wearable designs with long operational life
- Hardware AES-128 encryption engine protecting data security in connected sensor nodes without software overhead
- Integrated 512-byte EEPROM, 16 KB Flash, and 2 KB SRAM in LQFP-32 with 26 I/O lines for compact minimal-BOM designs
Applications
The STM32L021K4T7 targets ultra-low-power IoT sensors, smart meters, healthcare wearables, and building automation nodes where battery life exceeding several years is required from a CR2032 or similar primary cell. Its AES-128 hardware encryption supports secure data transmission in wireless sensor network protocols such as LoRaWAN and Zigbee. The LQFP-32 package with 26 I/O lines accommodates typical sensor interfaces including SPI, I2C, USART, and a 12-channel ADC in a space-efficient 7 mm x 7 mm footprint.
Specifications
| YTEOL | 9 |
| Has ADC | YES |
| Bit Size | 32 |
| Clock Frequency-Max | 32MHz |
| DMA Channels | YES |
| Number of I/O Lines | 26 |
| PWM Channels | YES |
| Package Shape | SQUARE |
| Package Style | FLATPACK, LOW PROFILE |
| Speed | 32MHz |
| Supply Voltage-Max | 3.6V |
| Supply Voltage-Min | 1.8V |
| Supply Voltage-Nom | 3V |
| Surface Mount | YES |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.8mm |
| Terminal Position | QUAD |
| uPs/uCs/Peripheral ICs Type | MICROCONTROLLER, RISC |
| Package | Quad Flat Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | 3A991.a.2 |
| HTS Code | 8542.31.00.25 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for STM32L021K4T7:
RISC Microcontroller, 32-Bit, FLASH, CORTEX-M0 CPU, 32MHz, CMOS, PQFP32
Frequently Asked Questions
What are the core clock speed and memory configuration of the STM32L021K4T7?
The STM32L021K4T7 runs at up to 32 MHz on its ARM Cortex-M0+ core and integrates 16 KB of Flash program memory, 2 KB of SRAM, and 512 bytes of EEPROM, providing sufficient storage for small firmware images and persistent configuration data in battery-powered sensor applications.
Which battery-powered sensor designs benefit most from the STM32L021K4T7's ultra-low-power characteristics?
Environmental monitoring sensors, smart meter nodes, asset tracking tags, and medical wearables operating from a 1.65 V to 3.6 V supply benefit most. In stop mode, the STM32L021K4T7 draws as little as 0.29 µA, enabling more than 10 years of operation from a standard 3 V lithium coin cell with infrequent wake intervals.
How does the hardware AES-128 engine in the STM32L021K4T7 reduce power consumption compared to a software AES implementation?
The hardware AES-128 accelerator completes a 128-bit block encryption in 16 clock cycles at 32 MHz, compared to several hundred cycles for a software implementation. This reduces active CPU time per encryption operation by roughly 10x, lowering average current consumption in applications that transmit encrypted data packets every few seconds.
What peripheral interfaces are available on the 26 I/O lines of the STM32L021K4T7 in its LQFP-32 package?
The 26 I/O lines support USART, SPI, and I2C serial interfaces, a 12-channel 12-bit ADC for analog sensor inputs, multiple timer channels including PWM outputs, and DMA-capable data transfer paths, providing a complete set of mixed-signal peripherals for typical IoT sensor node designs in a 7 mm x 7 mm LQFP-32 package.
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About STMicroelectronics
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