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EFR32MG21B Mighty Gecko SoC

SiLEFR32MG21B Mighty Gecko SoC

MPN: EFR32MG21B020F1024IM32-BR
Silicon Labs
RF System on a Chip - SoC Mighty Gecko, QFN32, 2.4G, 20dB, mesh multiprotocol, 1024kB, 96kB(RAM), 20 GPIO
695 in stock
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Overview

The EFR32MG21B020F1024IM32-BR is a Silicon Labs Mighty Gecko wireless SoC for 2.4 GHz mesh and multiprotocol designs. It combines an embedded MCU, radio, flash, and RAM in a compact QFN package for connected devices that need Zigbee, Thread, or Bluetooth Low Energy connectivity. It is aimed at low-power IoT endpoints and hubs that need a small footprint and integrated wireless capability.

Why Choose This Part

This part integrates the wireless transceiver, MCU, memory, and a small number of GPIOs into one device, which helps reduce BOM count and board area. The 2.4 GHz mesh/multiprotocol focus makes it a strong fit for Zigbee, Thread, and BLE-based products. It is a practical choice when you want Silicon Labs wireless ecosystem support and a compact QFN package for dense layouts.

Applications

Zigbee mesh nodes
Good for lights, sensors, switches, and other battery-powered or mains-powered Zigbee endpoints and routers.
Thread and Matter devices
Suitable for low-power 2.4 GHz connected products that need mesh networking and IPv6-based home automation.
Bluetooth Low Energy peripherals
Useful for short-range wireless products such as beacons, sensors, and simple wireless controls.
Smart home controllers and bridges
Can serve in gateways or bridge nodes that coordinate multiple 2.4 GHz protocols in a compact design.
Industrial wireless sensors
Fits compact sensor nodes and wireless instrumentation where low power and mesh connectivity matter.

Getting Started

A common starting point is a Silicon Labs EFR32MG21 development kit or a compatible radio board so you can evaluate RF performance and firmware before designing hardware. Development is typically done with Silicon Labs Simplicity Studio, using the vendor's wireless stacks and example projects for Zigbee, Thread, or Bluetooth LE. Pay close attention to the reference design guidance for the RF match network, antenna layout, and power supply decoupling, since those details strongly affect wireless performance.

Part of Silicon Labs EFR32 / EFM32 family » EFR32MG21

EFR32MG21 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Memory Interfaces Frequency Modulation RF Family/Standard Rx Current Stock
EFR32MG21B020F1024IM32-BR (this part) — — — — — — 695
EFR32MG21A020F1024IM32-B 1024k ADC, GPIO, I2C, I2.. 2.4GHz GFSK, O-QPSK Bluetooth 8.8mA 1,954
EFR32MG21B020F1024IM32-B 1MB I2C, I2S, SPI, IrD.. 2.4GHz DSSS, GFSK, O-QPSK 802.15.4, Bluetooth 8.8mA 2,302
EFR32MG21A020F768IM32-B 768k ADC, GPIO, I2C, I2.. 2.4GHz GFSK, O-QPSK Bluetooth 8.8mA 405
Also available as: EFR32MG21A020F1024IM32-BR, EFR32MG21A010F1024IM32-BR, EFR32MG21B010F1024IM32-BR, EFR32MG21A020F768IM32, EFR32MG21B020F512IM32-B, EFR32MG21B010F512IM32-B, EFR32MG21

Also Consider

EFR32MG21B Mighty Gecko SoC SiLSilicon Labs - Another EFR32MG21B option that is often considered when the same radio family is desired with a different memory tier.
CC2652R1 Texas Instruments Wireless MCU TITexas Instruments - A common alternative for 2.4 GHz low-power mesh and multiprotocol designs when evaluating a different ecosystem and toolchain.