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Voltage divider in SOT-23 package eases board routing and layout problems

Posted: 22 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:tt electronics? bi technologies? voltage divider network? divider network? ss1 series?

Providing design engineers with an alternative to large resistor network packages that require long signal traces and complex circuit layouts, TT Electronics BI Technologies Electronic Component Division has developed a SOT-23 packaged precision voltage divider network for aerospace, industrial, military and medical industries.

Designated the SS1 series, these divider networks consist of two ultra-stable Nichrome thin-film resistors on a silicon substrate. Packaged in a 3-lead SOT-23 package, the two resistors are connected in series for an optimized voltage divider circuit. A 3-resistor network is also available in a four-leaded SOT-143 package.

The resistor networks are available in a wide range of resistance nominal and ratio values from 5 k? to 100 k?. Standard ratio values include, but are not limited to, 1:1, 1:4 and 1:10. Individual resistor tolerances are available to 0.1 percent and ratio tolerances are offered to 0.05 percent. Standard temperature coefficient of resistance (TCR) ratings are 25ppm/C with tracking tolerances between resistors better than 5ppm/C. The operating temperature range is -55C to 125C.

"The SS1 Series networks offer design engineers the ability to place a precision network virtually anywhere in their circuit layout, eliminating the need for the long traces and complex routing schemes required for large networks," said Mike Torres, applications engineer and product marketing manager for BI Technologies Electronic Component Division, in a statement. "The SOT-23 package occupies a similar size footprint to a standard 1206 chip divider."

Torres also said that by using several SS1 series voltage dividers with various ratio values, designers can also eliminate the need for more expensive custom resistor networks.

The SS1 series resistors are produced on 150mm silicon wafers and are assembled into standard SOT-23 transistor packages to provide mechanical and environmental protection. The company's proprietary passivation process eliminates concerns about moisture environments for the Nichrome resistive elements. Environmental testing for 1,000 hours at 85C and 85 percent RH resulted in a less than 0.2 percent shift in resistance values, making these resistors ultra-stable with long-term reliability.

Typical pricing for the SS1 series resistor networks is less than 30 cents in quantities of 10,000. Delivery is eight weeks.

- Gina Roos

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