Epcos CeraDiodes from TTI protect against ESD

19th November 2009

ES Admin

0 0

TTI Inc., is now stocking a new range of devices for the ESD protection of data, audio and video lines (e.g. USB, Ethernet, IEEE 1394 and HDMI), analogue and digital connections, ICs and inputs/outputs in electronic equipment. CeraDiodes - ceramic multilayer semiconductor components from Epcos - are a cost-effective alternative to ESD protection components based on semiconductors such as Zener and TVS diodes, and are also, claims TTI, technically superior. In many cases, the bidirectional CeraDiodes can directly replace semiconductor ESD diodes with respect to form, fit and function.

Since high-speed data lines such as USB, IEEE 1394 and Ethernet carry very high data rates of several 100 Mbit/s, the capacitance of the ESD protection component must be minimized in order to avoid transmission losses. High-speed series CeraDiodes satisfy the requirements of USB 2.0, IEEE 1394, Ethernet and other standards thanks to their low capacitance (0.6 to 10 pF verified in qualifying tests). They satisfy the requirements of the international ESD standard IEC 61000-4-2, level 4, which tests them within the human body model (330 Ω / 150 pF). CeraDiodes function constantly up to an operating temperature of 85degC, whereas semiconductor diodes begin to derate at 25degC. Another benefit is that CeraDiodes ‘turn on’ in under 0.5ns.

The range of CeraDiodes offered by TTI comprises 0402 (SOD723), 0603 (SOD523) and 1003 (SOD323) single devices plus space-saving arrays: 0508, 0612 (both 4-in-1); 0506 (SOT666); and 1012 (SOT 23-6L) with various operating voltages from 5.6 to 30V and capacitance values from 0.6 to 470pF. As an example of a CeraDiode in application, the 0506 array CDA3C05GTH protects either one or two USB 2.0 ports or an IEEE 1394 interface with only a single component and no special interconnection layouts.