Synergy S3A1 Microcontrollers Renesas Synergy™ S3A1 Microcontrollers offer an optimal low-power and high-performance combination, a 48MHz Arm® Cortex®-M4 CPU core, a Floating-Point Unit, and a host of analog and security features ideal for a variety of embedded systems and IoT designs. The S3A1 MCUs are feature, pin, and IP compatible with other Synergy MCU Groups, offering unparalleled scalability and code reuse to accelerate hardware and software development. For design flexibility, the S3A1 MCUs are available in various memory densities and package/pin footprints.