EFR32MG21B020F768IM32-B

Overview

The EFR32MG21B020F768IM32-B is a Mighty Gecko RF System on Chip (SoC) from Silicon Labs, designed for line-powered IoT applications. It features an ARM Cortex-M33 core operating at up to 80 MHz, integrated with a 2.4 GHz radio supporting Bluetooth 5.1, Thread, and Zigbee protocols. The device includes 768 kB of flash memory and 64 kB of RAM. It operates within a voltage range of 1.71 V to 3.8 V and supports data rates up to 2 Mbps. Key electrical specifications include a maximum output power of 20 dBm and receive sensitivity of -104.9 dBm. The unit is housed in a 32-VFQFN package.

Feature Summary

• Supports multiprotocol wireless communication including Bluetooth 5.1, Thread, and Zigbee over the 2.4 GHz band.
• Integrates a high-performance ARM Cortex-M33 processor with Secure Vault technology for hardware-based security.
• Provides robust RF performance with programmable output power and high receiver sensitivity for reliable mesh networking.

Applications

• Line-powered smart lighting systems
• IoT gateways and hubs
• Voice assistants
• Smart meters

Procurement Notes

Verify the specific suffix 'BR' against the manufacturer's official documentation to confirm packaging configuration, as distributor listings may vary between tape-and-reel and other formats. Ensure the part number matches the exact memory and radio variant required for your design. Cross-reference the DigiKey or Mouser part identifiers with the Silicon Labs datasheet to confirm availability status and lead times prior to ordering. Confirm RoHS compliance requirements align with project specifications.

Selection Notes

Select this component when designing line-powered devices requiring high processing power and secure multiprotocol connectivity. The 768 kB flash and 64 kB RAM offer sufficient resources for complex application logic compared to lower-tier variants. The 20 dBm output power ensures extended range for mesh networks. Consider the 32-VFQFN package constraints for PCB layout and thermal management during the selection phase.

Part Context

This part belongs to the EFR32MG21 series, known as Mighty Gecko. It is optimized for 2.4 GHz wireless applications. The series emphasizes low active current consumption while maintaining high throughput. It integrates a crypto accelerator and physical unclonable function (PUF) for enhanced security. The B020 designation typically indicates the radio power class and protocol support within the MG21 family.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. For potential replacements, consult the official Silicon Labs product selector tool to identify compatible parts within the EFR32MG21 family that match the required flash size, RAM, and RF power specifications.