Metal Foil Resistors offer tolerances down to ±0.005%.
August 17, 2009 -
Military-qualified to MIL PRF 55182/9, QPL RNC90Y Bulk Metal® Foil Resistors offer resistance range of 4.99 W to 121 kW, ESD immunity up to 25 kV, and load-life stability of ±0.0005% for 2,000 hours at +125°C. Units feature power rating of 0.6 W at +70°C and 0.3 W at +125°C, with max working voltage of 300 V. Measuring 0.105 x 0.300 x 0.326 in., resistors have thermal stabilization time of less than 1 sec and 1.0 ns rise time.
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Original Press release
Vishay Intertechnology, Inc.
63 Lincoln Hwy., P.O. Box 4004
Malvern, PA, 19355 2143
USA
Vishay's QPL RNC90Y and Non-QPL S555 Bulk Metal® Foil, Established Reliability Resistors Combine Load Life Stability of ±0.005 %, Tolerance Down to ±0.005 %, and ESD Immunity up to 25 kV
MALVERN, Pa. - May 20, 2009 - Vishay Intertechnology, Inc. (NYSE: VSH) today announced that it has extended the resistance tolerance of the QPL RNC90Y family of established reliability Bulk Metal® Foil resistors down to ±0.005 %. For designers requiring higher or lower resistance values than the QPL range, but with the same performance capabilities, an S555 non-QPL version of the device is also available.
As "R" level established reliability resistors, RNC90Y devices are military-qualified to MIL PRF 55182/9, the standard for military and aerospace applications requiring superior performance such as tighter tolerances, lower temperature coefficients, and better long-term stability. The resistors' ability to retain their initial value through temperature change, load application, frequency shift, and short-time overload is unmatched in the industry. Designers can expect the RNC90Y devices to display stability levels that are orders of magnitude better than thin and thick film resistors (parts per million changes in service as opposed to percentage changes).
The enhanced devices offer a broad resistance range of 4.99 W to 121 kW, and a load-life stability of ±0.005 % for 2000 hours at + 125 °C. Since Vishay Foil resistors are not restricted to standard values, and can be supplied with "as required" values (e.g. 100.123 kW vs. 100 kW) at no extra cost or delivery time, Vishay is able to offer the S555 as an alternative to the RNC90Y.
The S555 is a specially conditioned, non-QPL resistor for customers desiring higher or lower resistance values with the same or better performance capabilities as the RNC90Y. Both the qualified and the non-qualified version are manufactured on the same production line and are subjected to the same process, lot control, conditioning, and100% Group A screening. Qualified versions receive additional MIL Group B and C testing.
Both resistors feature a power rating of 0.6 W at + 70 °C and 0.3 W at + 125 °C, with a maximum working voltage of 300 V. Each device measures 0.105 in. by 0.300 in. (2.67 mm by 7.62 mm), with a height of 0.326 in. (8.28 mm), and typically weighs 0.6 grams.
While other resistor technologies can take several seconds or even minutes to achieve a steady-state thermal stabilization, the RNC90Y and S555 devices have an almost instantaneous thermal stabilization time of < 1 second, and a nearly immeasurable 1.0-ns rise time, effectively without ringing. The ultimate resistors for analog applications, the devices are built to handle unconventional environmental conditions above and below the earth's surface with minimal drift. Their construction guarantees a high level of reliability, and provides high resistance to thermal shock, moisture, mechanical shock, and vibrations.
Thick and thin film resistors exhibit a continuous shift in resistance throughout their serviceable load life. Conversely, Vishay's Bulk Metal Foil resistors exhibit virtually no change in resistance after the minimal initial shift during the first 168 hours of operation. Where required, the minimal initial shift can be prevented by post-manufacturing operations (PMO) that result in the resistor having virtually no change in resistance, from initial installation into equipment through its entire load life.
A short-time overload of 6.25 x rated power has no effect on the resistance of a PMO-serviced resistor, which returns to its initial value as soon as the heat of the power overload dissipates. While still in the heat of the power overload, the temporary shift is only about 0.01 %, equal to the low temperature coefficient times the temperature rise.
Offering the utmost in ESD immunity, the resistors withstand electrostatic discharges up to 25 kV, for increased reliability, and offer a non-inductive (< 0.08 µH), non-capacitive design. The RNC90Y devices are available only with tin/lead alloy terminations, and offer 0.15-in lead spacing, with a 0.2-in version available: the RNC90T.
Prototype samples and production orders of the RNC90Y and S555 resistors are available now, with lead times from eight weeks. Standard equivalents for proof-of-design prototypes are available in as little as five days.
Vishay Intertechnology, Inc., a Fortune 1,000 Company listed on the NYSE (VSH), is one of the world's largest manufacturers of discrete semiconductors (diodes, rectifiers, MOSFETs, optoelectronics, and selected ICs) and passive electronic components (resistors, capacitors, inductors, sensors, and transducers). These components are used in virtually all types of electronic devices and equipment, in the industrial, computing, automotive, consumer, telecommunications, military, aerospace, and medical markets. Its product innovations, successful acquisition strategy, and "one-stop shop" service have made Vishay a global industry leader. Vishay can be found on the Internet at http://www.vishay.com.
Bulk Metal is a registered trademark of Vishay Intertechnology, Inc.
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