Industrial automation systems are growing more interconnected and intelligent to accommodate demands for centralized control, optimized production and reduced cost. IO-Link is becoming an increasingly popular interface to smart sensors and actuators, combining signaling with power-over-cable technology. The interface electronics must be rugged, power efficient and compact. Two new parts capably meet these requirements. The LTC2874 is a highly integrated IO-Link master-side physical layer interface (PHY) for four ports. The LT3669 is a device-side PHY incorporating a step-down regulator and LDO. This paper begins with a brief overview of IO-Link technology, and follows with LTC2874 and LT3669 functions and features.