Application Design Center - Wireless LAN Access Point

97 - Unused - ESD Protection of USB 2.0

Solutions

Design Notes:

Protection Application:

The data signals used in a USB 2.0 port vary between 0V to +0.5V, with a maximum data rate of 480Mbps. At this data rate, the capacitance of the suppressor needs to be minimized. The signal lines to be protected from ESD include D+ and D-

Solution Description:

As shown at the left, the data lines can be protected by a two-channel array with 0.65 pF (for example the SP3003-02XTG).

Companion Solutions:

Other solutions within the LF portfolio exist in addition to these recommendations. For example, if the power bus requires overcurrent protection, a resettable PTC can be chosen.

Regulatory Issues:

The IEC 61000-4-2 will be the most appropriate standard that applies for this port. It supplies a test method for verifying that the end product is not susceptible to ESD events.

Unique Features:

Does Not Apply

Application Warnings:

Does Not Apply