Passive Components


New high-speed CeraDiodes

18 May 2005 Passive Components

Epcos is extending its CeraDiode series by a 3 pF type with the same solder-path dimensions as a TVS diode in the SOD 323 package. It says the new type can be used with the same footprint in the previous design (1:1 drop-in replacement), so that customers have no need to redesign their circuit boards. The new high-speed CeraDiode can also be used as a second source for the existing semiconductor solution.

Because of the lower capacitance of the 3 pF type, signal distortions are avoided. The high-speed CeraDiode is used for the ESD protection of data and video lines with ultra-fast data transmission rates (such as USB 2.0, Ethernet, Firewire). In contrast, says Epcos, typical semiconductor solutions cannot currently reach capacitances below the 5 pF limit and can therefore no longer satisfy the customer requirements for ever higher data rates.

The new 3 pF type high-speed CeraDiode, the CDS4C16GTH, measures 0,8 x 2,5 mm.

Epcos additionally offers a 'standard type,' the CDS4C12GTA, to replace the SOD 323 TVS diodes. This CeraDiode with a capacitance of 68 pF is used for both general ESD protection and as an EMC filter (eg, for audio lines).

Both CeraDiode types offer the following advantages over SOD 323 TVS diodes: fast response time under 0,5 ns; extremely low leakage currents; bi-directional protection; no degradation up to 85°C; use as ESD protection as well as EMC filters due to stable capacitance; higher robustness.



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