Low-capacitance transient protection for USB 3.0

January 14, 2015 // By Graham Prophet
RClamp 3346P is a single-chip 6-line 3.3V SCR TVS protection device designed to meet the demanding performance requirements of USB 3.0

Semtech's ultra-low capacitance transient voltage suppression (TVS) device protects USB 3.0 interfaces in computing and mobile devices from electrostatic discharge (ESD) events.

The RClamp3346P supplements Semtech’s current USB protection portfolio by providing ultra-low clamping voltage performance and low dynamic resistance in an easy-to-lay-out package. Current USB 3.0 protection schemes usually call for multiple TVS devices, complicating the design and final bill of materials. The RClamp3346P replaces up to six discrete components and protects the SuperSpeed pairs plus the high-speed signal lines in a 2.7 by 0.8 mm package.

Built on Semtech’s SCR process technology, the RClamp3346P achieves the lowest overall clamping voltage without impacting signal quality. Designed to meet the high operating data rate of the USB 3.0 interface, this device introduces less than 0.65 pF capacitance into the signal path.

“A major trend with the newest generation of controllers is the increased ESD sensitivity due to shrinking process geometry.” said Rick Hansen, Product Marketing Director for Semtech’s Protection Products. “We believe the RClamp3346P is the perfect solution, giving designers peace of mind knowing the system is well protected from ESD transients.”

The RClamp3346P is also qualified to grade 1 of the AEC-Q100 automotive reliability standard. It offers; transient protection for high-speed data lines to: IEC 61000-4-2 (ESD) ±20 kV (air), ±12 kV (contact); IEC 61000-4-4 (EFT) 40A (5/50 nsec); IEC 61000-4-5 (lightning) 5A (8/20 µsec). It has dynamic resistance of 0.15 Ohm typical.

The RClamp3346P is priced at $0.37 (3,000).

Semtech; www.semtech.com