EFR32MG21

EFR32MG21 is the the first product in a the Series 2 family of Wireless SoCs based on an ARM Cortex M33 MCU.  
Series 2 devices are the next evolution of Wireless Gecko Series 1 (EFR32xG1, xG12, xG13 and xG14) that are designed to increase processing capability, improve RF performance, lower active current and provide a higher level of Security.  EFR32MG21 supports Zigbee, Thread and Bluetooth 5.1.

EFR32BG21

EFR32BG21 is the the first product in a the Series 2 family of Wireless SoCs based on an ARM Cortex M33 MCU.  
Series 2 devices are the next evolution of Wireless Gecko Series 1 (EFR32xG1, xG12, xG13 and xG14) that are designed to increase processing capability, improve RF performance, lower active current and provide a higher level of Security.  EFR32BG21 supports Bluetooth 5.1, including 1Mbps, 2Mbps and Bluetooth Long Range.