LPC553x/S3x MCU Family NXP Semiconductors LPC553x/S3x MCU Family expands the general-purpose Cortex-M33-based MCU series. It offers significant performance enhancement, all on-chip RAM with parity or ECC, renewed security features, and precision analogue additions. The product family leverages the cost-effective 40nm NVM process technology. The LPC553x/S3x family includes a proprietary DSP accelerator offering 10x clock cycle reduction, bringing significant signal processing efficiency gains.