SoC extends IoT range with efficient sub-GHz radio

Joining Silicon Labs’ sub-GHz wireless SoC family, the FG23L delivers secure long-range connectivity for resource-constrained IoT devices. Its link budget of ~146 dB and transmit power of +20 dBm provide up to twice the range of comparable devices. By balancing performance and affordability, the SoC broadens sub-GHz adoption across markets from industrial automation and smart city infrastructure to agriculture IoT and connected homes.

The FG23L runs on a 78-MHz Arm Cortex-M33 with DSP extensions and an FPU for efficient signal processing. It includes 128 KB of flash and 32 KB of RAM to support application and data storage. The low-power radio core spans the full range of license-free sub-GHz ISM bands (110 MHz to 970 MHz). Active and sleep currents of 36 µA/MHz and 1.2 µA, respectively, enable over 10 years of battery life.

Midlevel Secure Vault safeguards the communication channel and defends against logical attack vectors. Security features include a true random number generator, crypto engine, secure application boot, and secure debug lock/unlock.

The FG23L will be generally available on September 30, 2025. Developer kits are available now.

FG23L product page 

Silicon Labs 

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