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R-C protection devices target 3G handsets

Posted: 06 Jan 2009 ?? ?Print Version ?Bookmark and Share

Keywords:devices protection R-C? interface LCD? protection ESD?

Semtech Corp.'s EClamp237xK family of resistor-capacitor (R-C) protection devices tout low capacitance, high attenuation and low clamping voltage needed for high-resolution color LCD interfaces in GSM and CDMA-based 3G handsets.

The devices safeguard lines for cellular frequencies between 1.8-2.5GHz, the data rates required by the latest generation of high-resolution LCD screens used for visually oriented 3G handsets. The EClamp237xK series includes the four-line EClamp2374K, the six-line EClamp2376K and the eight-line EClamp2378K. These devices have a very low C(in) value of 20pF, and together with a series resistance of 100, they provide greater than 30dB attenuation for cellphone frequencies.

The EClamp237xK packages are narrow (1.3mm) and low profile (0.50mm), with a variable length depending on the number of lines supported. The flow-through design simplifies signal routing for a faster and more convenient layout. These parts feature a 400?m lead pitch, saving up to 33 percent in board space compared to 500?m pitch parts. With a height reduction of 14 percent, they enable filter protection in low-profile designs.

Each device in the family includes TVS diodes for ESD protection, and an R-C network for EMI and RF interference filtering. The devices complement Semtech's EClamp238xK series of R-C devices, giving designers more flexibility for protecting color LCD displays.

Flip chip alternatives
The EClamp237xK devices are available in the RoHS/WEEE-compliant Semtech Leadless Package, which offers the small, low-profile design as "flip chip" alternatives, but with increased manufacturing durability. The high integration of the EClamp237xK devices replaces 32 discrete passive devices in a typical handset design, thus saving board space.

"While higher-resolution screens on handsets are enabling a wide range of new consumer services, they still remain a high EMI/ESD threat environment," said Rick Hansen, Semtech's director of marketing for protection products. "This new product family is designed to provide both the higher data rates needed for these LCDs as well as the low profile and small size to provide design flexibility for smaller handset form factors."

The EClamp2374K is priced at $0.25 each in 1,000-piece lots; the EClamp2376K is priced at $0.33 each in 1,000-piece lots; and the EClamp2378K is priced at $0.40 each in 1,000-piece lots. All three parts are available immediately in production quantities.

- Toni McConnel

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