Electronic – What does this schematic symbol mean

componentsschematics

I'm trying to understand what the following symbol is for. It's found in this schematic.

enter image description here

Best Answer

This device is a transient voltage suppressor for USB D+ and D- signals. It protects the device from static voltages that may develop when inserting or removing USB devices to connectors.

The four diodes (on side) act as clamping diodes that conduct to suppress ESD.

This or similar device can be found in this Semtech catalog