STM 300C features an energy harvesting interface for the implementation of self-powered products. The minimal standby power consumption makes it especially suitable for energy harvesting wireless solutions such as bidirectional temperature sensors, sensors in building services and innovative actuators. STM 300C can be powered by a solar cell, available in two sizes - ECS 300 and ECS 310.

STM 300C supports the helical antenna ANT 300C.