What this 4-channel rail-to-rail steering diode does
The Texas Instruments TPD4S009DGSR is a steering (rail-to-rail) ESD protection diode array designed to clamp fast transients on high-speed differential data lines. It integrates four unidirectional channels in a single 10-VSSOP package, each rated for 25 W peak pulse power. Power line protection is included, meaning the device can also protect the supply rail feeding the interface IC.
Where it fits — HDMI and Ethernet ports
The TPD4S009DGSR is specified for Ethernet and HDMI applications. Four channels map directly to the four TMDS differential pairs in HDMI (or four Ethernet signal pairs). The rail-to-rail steering architecture shunts ESD current to the positive supply or ground, keeping the protected IC's voltage within the supply rails.
Surface-mount in a 10-MSOP (3.00 mm width) package; the supplier device package is 10-VSSOP.