Electronic – What’s this component


What is this component?(U6)



Best Answer

It's a transient absorber / suppressor.

The 4 diodes form a full wave bridge feeding voltage spikes from D+ and D- to the 3V3 power rails plus it has a zener diode acting as a voltage clamp across the rails to absorb any energy which causes the rail voltage to rise.

A look at NXP Semiconductors application note AAAAn10753 which Nick Alexeev provided the link to show that one part which matches that functionality exactly is NXP's PRTR5V0U2F/K Ultra low capacitance double rail-to-rail ESD protector Datasheet here. This is effectively an Application Note for USB2 ESD protection and the impact of protection on the USB signals - worth reading.

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