Recommended layout for USB ports
As apparent in Figure 3, two difference signal lines (D+ and D-) are routed from the plug connector to the TVS diode and continue via the current-compensated data line choke to the USB controller. The result is outstanding ESD protection, as well as good suppression of the data line pair. VBUS is routed via the TVS diode to the SMD ferrite. After the SMD ferrite, an additional capacitor and a further SMD ferrite can be inserted to achieve the highest possible attenuation of a PI filter.
In case of very sensitive ICs and/or high-reliability developments, optimized ESD protection can be achieved by double-contacting the TVS diode (art. no. 824 015) pins. (Figure 4)
Developers who prefer a single-channel protection element can use the WE-VE series ESD suppressors. These always have to be connected from D+/D- to GND. The other components are connected, as shown here. Figure 5