Silicon Labs’ Si875x family features the industry’s first isolated FET drivers that enable designers to pair with an application-specific, high-volume, discrete FET to replace electromechanical relays (EMR) and optocoupler-based solid-state relays (SSR) used in motor controls, HVAC relays, AC mains line, and communications switches. The Si875x isolated FET driver provides a better alternative to electromechanical relays as it reduces system costs and power, provides superior stability over time and temperature, and improves switching noise and reliability. A floating secondary-side DC voltage source in the Si875x generates its own gate-drive output voltage that reduces circuit cost, size, and complexity.