TVS diode arrays prevent ESD damage to high-speed interfaces

Two series of TVS diode arrays (SPA diodes) from Littelfuse are designed to safeguard many of the latest high-speed interfaces from damage due to electrostatic discharges (ESD).

The SP7538P TVS diode arrays integrate eight channels of low capacitance rail-to-rail diodes and an additional zener diode. The SP0544T TVS diode arrays are similar but smaller, with four channels of low capacitance rail-to-rail diodes instead of eight. Both arrays can safely absorb repetitive ESD strikes above the maximum level specified in the IEC61000-4-2 international standard (±8kV contact discharge) without performance degradation, says the company. The low loading capacitance also makes them suitable for protecting high-speed signal pins.

Typical applications include ESD protection for interfaces like V-By-One, Embedded DisplayPort, USB 2.0/3.0 Ports, and HDMI, as well as flat panel displays, LCD/LED TVs, smartphones and mobile computing.

Benefits include a low loading capacitance of 0.5pF (typical) per I/O to reduce signal degradation and distortion for high-speed applications. They offer low dynamic resistance (0.4Ohm), which provides low clamping performance to ensure better protection for sensitive chipsets. The enhanced ESD capability (±12kV contact, ±25kV air) permits manufacturers to achieve ESD protection beyond the maximum level stated in the IEC standard and protects against other threats to ensure product reliability in the field.

The SP7538P is packaged in a microDFN-9 package and the SP0544T comes in a microDFN-10 package.


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