The ATSAML21G18B from Microchip Technology is a 32-bit microcontroller built on the ultra-low-power ARM Cortex-M0+ core, part of the well-established SAM L21 family. It suits engineers designing battery-powered, portable, and connected products where long runtime and tight energy budgets matter as much as processing headroom.
The SAM L21 series pairs a 48 MHz Cortex-M0+ with 256 KB of Flash and 32 KB of SRAM, and carries Microchip’s Functional Safety (FuSa) support for designs with reliability requirements. This variant ships in a compact 48-pin surface-mount package and is RoHS-compliant and Pb-free. Here is what makes it a dependable choice for your next build.
Key Features of the ATSAML21G18B
Ultra-Low-Power 32-Bit Performance
Built on the ARM Cortex-M0+ core running at up to 48 MHz, the ATSAML21G18B delivers genuine 32-bit processing while keeping power draw low. That balance makes it well suited to battery-powered and energy-harvesting designs that still need real computational capability.
Generous On-Chip Memory
With 256 KB of Flash and 32 KB of SRAM, the device gives firmware room to grow without an external memory chip. This helps keep board size, cost, and bill-of-materials complexity down.
Functional Safety (FuSa) Support
Microchip provides Functional Safety documentation and support for the SAM L21 family, helping teams meet reliability and certification requirements. This is valuable for industrial, medical, and other applications where robustness is non-negotiable.
Flexible Serial Connectivity
Configurable SERCOM interfaces let the same peripheral act as USART, SPI, or I2C, so the device adapts to the sensors, memories, and other ICs on your board. An integrated 12-bit ADC and 10-bit DAC handle analog signal chains without extra parts.
Compact Surface-Mount Package, Pb-Free
The 48-pin surface-mount package fits space-constrained PCBs and mounts cleanly in automated assembly. It is RoHS-compliant and Pb-free, supporting greener manufacturing.
Wide Operating Range
The device runs from 1.62 V to 3.6 V across a -40°C to +85°C temperature range, giving it headroom for both consumer and more demanding industrial environments.
Applications of the ATSAML21G18B
This part is typically used in:
- Battery-powered and portable devices
- IoT and connected edge devices
- Wearable electronics
- Home and building automation
- Industrial sensors and monitoring nodes
- Medical and healthcare devices
- Smart metering and utility equipment
- Capacitive touch and HMI interfaces
- Security and access-control systems
- Consumer electronics