Four-channel steering diode for Ethernet port protection
The Texas Instruments TPD4E001DRSR is a four-channel steering (rail-to-rail) TVS diode array designed to clamp fast transients on Ethernet signal lines. Each of the four unidirectional channels routes an overvoltage event to the supply rail or ground, keeping the PHY or magnetics side safe.
The 100 W peak pulse power rating (8/20 µs waveform) tells you the single-pulse surge capability per channel. For a typical 10/100BASE-T Ethernet port, this is enough to survive ESD strikes (IEC 61000-4-2) and the lower-energy coupled surges from cable discharge events. It will not handle a direct lightning surge without additional series resistance or a higher-energy primary protector — the 100 W figure sets the expectation for secondary-side, board-level clamping.
The small footprint keeps the trace length short between the connector and the diode — critical for maintaining low clamping inductance on fast edges.