High-speed varistors

Epcos has extended its CeraDiode CDS4 series with a 3 pF type that has the same solder pad dimensions (2.5 x 0.8 mm) as a TVS diode in an SOD 323 package.

The latest type CDS4C16GTH can be used as a drop-in replacement for diodes so that users can avoid redesign of circuit boards.

Signal distortion is largely avoided. Semiconductors that cannot drop below the 5 pF threshold cannot satisfy demands for higher transmission rates.

The high-speed diode is used for ESD protection of data and video lines with high data rates, such as USB 2.0, ethernet and Firewire.

The company also offers a standard type (CDS4C12GTA) rated at 68 pF with the same footprint. This variant is used for general ESD protection and as an EMC filter for audio lines.

Both types have a response time of less than 0.5 ns. Further advantages include low leakage currents and no degradation at temperatures up to +85°C.