EFR32MG21A020F768IM32-B

Overview

The EFR32MG21A020F768IM32-B is a Mighty Gecko Series 2 wireless System on Chip (SoC) from Silicon Labs, designed for line-powered IoT applications. It integrates an ARM Cortex-M33 core operating at up to 40 MHz with 768 kB of flash memory and 64 kB of RAM. The device supports Bluetooth 5.1, Thread, and Zigbee protocols over a 2.4 GHz radio interface. Key electrical parameters include a maximum output power of 20 dBm, receive sensitivity of -94.4 dBm at 2 Mbps GFSK, and active current consumption of 8.8 mA during reception and 33.8 mA during transmission. It operates within a voltage range of 1.71 V to 3.8 V and functions across temperatures from -40°C to +125°C.

Feature Summary

• Supports multiprotocol operation including Bluetooth 5.1, Thread, and Zigbee mesh networks
• Integrates Secure Vault technology with Physically Unclonable Function (PUF) hardware for enhanced security
• Features high RF performance with programmable output power up to 20 dBm
• Includes rich analog and digital peripherals such as a 12-bit ADC and multiple communication interfaces

Applications

• Line-powered Zigbee and Thread mesh networking devices
• Bluetooth mesh lighting systems and smart switches
• IoT gateways and voice assistants
• Smart metering infrastructure

Procurement Notes

Verify the specific suffix 'BR' indicates tape-and-reel packaging when sourcing, as opposed to tray packaging found in other variants like the non-BR version. Confirm assembly site and package label updates via recent Product Change Notices (PCNs). Ensure compatibility with Simplicity Studio 5 development tools for firmware deployment. Check moisture sensitivity level (MSL 2) requirements for storage and handling prior to soldering.

Selection Notes

Select this variant for applications requiring 768 kB of program memory and 64 kB of RAM. Choose this part over higher-memory options if cost or pin-count constraints apply, noting that GPIO count remains consistent across the series. Verify that the 32-VFQFN exposed pad package fits the PCB footprint. Consider the 40 MHz clock speed sufficient for the intended application logic and protocol stack overhead.

Part Context

This component belongs to the EFR32MG21 Mighty Gecko family, optimized for robust 2.4 GHz wireless connectivity. It shares the same core architecture and RF capabilities as other MG21 variants but differs in memory configuration and packaging style. The device is part of Silicon Labs' Series 2 portfolio, emphasizing low power consumption and integrated security features for next-generation connected products.

Replacement Considerations

EFR32MG21A020F768IM32-BR serves as the tape-and-reel equivalent of the tray-packaged EFR32MG21A020F768IM32-B. Both share identical electrical specifications and functionality. Ensure the manufacturing assembly site matches project requirements by checking current PCNs.