UCC33421-Q1 devices use adaptive spread spectrum modulation (SSM) algorithm for the internal oscillator to reduce the noise emmissions from the device. The adaptive SSM algorithm ensures a full switching frequency scan between two bands during each burst cycle regardless of the loading consitions to ensure similair impact of SSM at different loading conditions. In addition, the UCC33421-Q1 uses advanced internal layout scheme to minimize radiated emissions at the system level.

Many applications in harsh industrial environment are sensitive to disturbances such as electrostatic discharge (ESD), electrical fast transient (EFT), surge and electromagnetic emissions. These electromagnetic disturbances are regulated by international standards such as IEC 61000-4-x , CISPR-32 and CISPR-25. Although system-level performance and reliability depends, to a large extent, on the application board design and layout, the device incorporates many chip-level design improvements for overall system robustness.