TVS diode arrays are used when: the PHY circuits being protected require low clamping voltages, low capacitance from 0.4 pF to 5 pF typical, and low leakage current around 0.1 μA to 25 μA when multiple lines must be protected and board space is limited and when transients appear due to a variety of threats.
They’re available in a wide selection of small-form-factor packages, ranging from single devices for single-port protection to multiple devices to protect multiple lines, all within a single package to minimize footprint requirements. After calculating a printed-circuit board’s (PCB’s) creepage and clearance distances, we must select protection devices for both sides of the Ethernet I/O connections, i.e., the line (RJ-45) and driver (physical layer, or PHY) sides.Įthernet protection devices typically are multi-channel transient-voltage suppressor (TVS) diode arrays, which provide the lowest clamping voltages available among the various protection technologies. Good design practice for Ethernet ports needs overvoltage and overcurrent protection devices in addition to proper component creepage distances and electrical trace clearances.
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