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Zener diode arrays provide ESD protection for high speed I/O ports

Posted: 13 Oct 2004 ?? ?Print Version ?Bookmark and Share

Keywords:california micro devices? camd? zener diode array? cm1218? cm1219?

California Micro Devices (CAMD) unveiled what it claims as the industry's lowest capacitance families of Zener diode arrays for electrostatic discharge (ESD) protection.

Utilizing proprietary Centurion Zener process technology, the CM1218 and CM1219 have reshaped the value proposition for customers seeking ESD protection for high speed I/O ports on PCs, digital consumer applications and wireless handsets, the company said.

The CM1219 features an input capacitance of 4pF and protects ESD strikes up to 8kV contact discharge, while the CM1218 has a 7pF input capacitance and provides ESD protection at 15kV contact discharge. The low capacitance of these devices makes them suitable for higher speed I/O ports such as video ports on PCs and digital consumer electronics, and in I/O data ports on wireless handsets. According to CAMD, the use of Zener diodes eliminates the need for routing a positive voltage rail to the ESD protection device, required for dual rail clamp ESD devices, reducing package size and cost by eliminating the need for an additional pin, and simplifying board layout.

The CM1218 and CM1219 are offered in standard SOT23 and SC70 packages, as well as in a 5 lead SOT553 and 6 lead SOT563 for the 4 channel and 5 channel versions, respectively. The SOT553 and SOT563 packages represent a space savings of 43 percent compared to a SC70 package, CAMD added.

Both products are currently sampling, with pricing falling between 23 cents and 52 cents each at 1,000 units, depending on number of channels and package. Volume production is scheduled for Q4 2004. Lead free versions are also available.





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