VIA to GND Plane

VIA to 5V Plane

VIA to 3.3V Plane

VIA to LV Plane

Pin to GND

Legend

TPD12S521

HDMI

Connector

1

11

TPD12S521

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SLVS639F – OCTOBER 2007 – REVISED FEBRUARY 2016

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11 Layout

11.1 Layout Guidelines

•

The optimum placement is as close to the connector as possible.

–

EMI during an ESD event can couple from the trace being struck to other nearby unprotected traces,

resulting in early system failures.

–

The PCB designer needs to minimize the possibility of EMI coupling by keeping any unprotected traces

away from the protected traces which are between the TVS and the connector.

•

Route the protected traces as straight as possible.

•

Eliminate any sharp corners on the protected traces between the TVS and the connector by using rounded

corners with the largest radii possible.

–

Electric fields tend to build up on corners, increasing EMI coupling.

11.2 Layout Example

Use external and internal ground planes and stitch them together with VIAs as close to the GND pins of TPD12S521

as possible. This allows for a low impedance path to ground so that the device can properly dissipate an ESD event.