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ESD protection diode answers prayer for board space savings

Posted: 11 Aug 2005     Print Version  Bookmark and Share


ON Semiconductor has developed dual series of high performance, micro-packaged electrostatic discharge (ESD) protection diodes that are is designed to protect voltage sensitive components for two lines in applications that demand minimal board space and low profiles.

Members of the µESD dual series have been designed to maximize ESD suppression performance in the smallest 3-leaded plastic package on the market today, said ON Semi. The µESD dual series clamps 30kV ESD transients, per the IEC61000-4-2 standard, in less than a nanosecond to ensure voltage sensitive components are protected. Additionally, said the company, these products clamp ESD pulses to <7V to protect the most sensitive systems and minimize disruption in a circuit's functionality.

"For designers dedicated to meeting strict ESD compliance standards, our µESD dual devices offer a compelling alternative to commonly used Multi-Layer Varistors (MLVs)," said Gary Straker, director of marketing for ON Semi's Small Signal Division. "The µESD dual device can protect two lines in less board space than two 0402 MLVs, while offering numerous performance advantages by delivering lower clamping voltage, lower leakage, faster response time and ability to withstand multiple ESD strikes without undesirable shifts in electrical characteristics."

The new products are housed in the ultra small SOT-723 package with a 1.2-by-1.2mm outline, making it suitable for designers with limited board space. In addition, the 0.5mm profile of this package enables designers to minimize the height of their designs without sacrificing functionality. The two line protection that this series integrates into one package further reduces required board space and system component count, added ON Semi, thus simplifying the assembly process.

In addition, the new ESD protection devices promise to improve circuit efficiency and battery life with a low leakage of 0.05µA in their off state. Their 35pF capacitance also makes them suitable for protecting data lines with data rates up to 10Mbps.

The uESD3.3D and uESD5.0D are available in a SOT-723 package and are priced at 7 cents per unit in 10,000 unit quantities.

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