Raleigh, N.C. Stackpole Electronics, Inc. has added 0402, 2010 and 2512 packages to the RMCG series of sulfur impervious thick- film chip resistors. This series offers the same electrical and environmental performance of the standard commercial RMC chip resistor with additional protection against sulfur contamination.
The RMCG series is now available in standard EIA case sizes from 0402 to 2512, in resistance values from 10 ohms to 1 Megohms, and in resistance tolerances as low as 1%. Power ratings range from .063 watt for the 0402 up to 1 watt for the 2512, with a standard temperature coefficient of resistance (TCR) of 200 ppm.
The RMCG series has a layer of gold which completely insulates the termination against the detrimental effects of sulfur. In high sulfur environments such as automotive, industrial machinery, or in highly industrialized areas, standard thick-film chip resistors have shown some susceptibility to sulfur contamination. Sulfur reacts with the silver present in the terminations of standard thick-film chip resistors forming silver sulfide which is non-conductive and causes catastrophic open failures, said Stackpole.
The RMCS series is also available with increased palladium in the terminations for a less costly, but not completely impervious solution. The RMCG is available in standard tape and reel packaging. Standard reel quantities are 4,000 pieces for the 1210 to 2512 sizes, 5,000 pieces for the 0603 to 1206 sizes, and 10,000 pieces for the 0402 size.
Pricing: Ranges from $15 per thousand to $200 per thousand, depending on size, tolerance and volume.
Stackpole Electronics, 1-919-850-9500, www.seielect.com