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SMT resistors offer tight tolerance, 25kV ESD rating

Posted: 19 Oct 2007 ?? ?Print Version ?Bookmark and Share

Keywords:surface-mount resistor? PCB? ESD rating?


Vishay Intertechnology Inc. has unveiled the SMR1DZ and SMR3DZ ultra-high-precision Z-Foil molded surface-mount resistors, which provide a low typical TCR of 0.05ppm/C from 0C to 60C and 0.2ppm/C from -55C to +125C, a PCR of 5ppm at rated power, tolerances to 0.01 percent, and a load life ratio stability of 0.005 percent.

The SMR1DZ features a power rating of 250mW at 70C, while the SMR3DZ offers a power rating of 600mW at 70C. Both devices have a load-life stability of 0.005 percent for 2,000 hours at 70C; a low voltage coefficient of The new resistors are built on Vishay's breakthrough Z- foil technology, which provides a significant reduction of the resistive component's sensitivity to ambient temperature variations (TCR) and applied power changes (PCR). Z-Foil improves stability by an order of magnitude compared to any other resistor technology, allowing designers to guarantee a high degree of accuracy in fixed-resistor applications.

Featuring flexible terminations to ensure minimal stress transference from the PCB due to a difference in thermal coefficient of expansion, the devices offer a wide resistance range of 5? to 80k?, with any value at any tolerance available to designers for their specific application requirements.

Applications for the new devices include precision amplifiers; high-precision instrumentation; medical and ATE; high-end stereo equipment; electron beam scanning and recording equipment; and military, aerospace, and down-hole equipment and instrumentation.

Samples and production quantities of the new Z-Foil resistors are available, with lead times of four to six weeks for larger orders.

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