What this rail-to-rail steering TVS array does for your Ethernet port
The Texas Instruments TPD4E001DPKR is a steering (rail-to-rail) TVS diode array designed to clamp ESD and other transient overvoltages on high-speed data lines, with Ethernet as a primary application target. It integrates four unidirectional channels, each rated for 100W peak pulse power, and presents a typical reverse standoff voltage of 5.5V (max), which keeps the signal lines clean during normal 5V Ethernet operation while shunting transients to the supply rails.
100W peak pulse — enough for port-level ESD protection
The 100W peak pulse power rating (8/20 µs waveform) covers the typical IEC 61000-4-2 ESD stress at the connector. For a 5V Ethernet PHY, the 5.5V max reverse standoff ensures the TVS does not clip the signal during normal line swings. The rail-to-rail steering topology routes the transient current to the positive supply or ground, which keeps the clamping voltage low and predictable — important when the PHY's internal ESD structures are weak.
Package and footprint — 6-USON, 1.6x1.6 mm
The 6-USON (1.6x1.6 mm) package is a small, leadless surface-mount package with a 0.5 mm pitch. It is a good fit for space-constrained designs like Ethernet jacks, USB ports, or HDMI connectors. The supplier device package is 6-USON (1.6x1.6), so the PCB land pattern matches the standard USON-6 footprint. Mounting is surface mount only.
The storage temperature range is wider, but the operating limit governs the board-level thermal design.