This document provides information on the MSP430 SoC with RF Core, which is a family of ultra-low power microcontroller system-on-chip devices with integrated sub-1GHz RF transceiver cores. The devices combine the MSP430 CPU with up to 32KB flash memory, 4KB RAM, timers, ADC, communication interfaces, security features, and an RF transceiver core. They are suited for wireless sensor applications like smart meters and thermostats requiring low power and RF connectivity. Device features and available family members are described.