September 1, 2009 -
Combining 4 independent Bulk Metal® Foil resistors in one 8-pin, SMT, ceramic gull wing package, SMNH resistor network features load life stability of 0.005% at 0.1 W/resistor at +70°C for 1,000 hr and load life stability ratio of 0.005%. Shelf-life stability per resistor is 0.0002%, and shelf life stability ratio is 0.0001% for at least 6 years. Immune to ESD up to 25 kV, non-inductive and non-hot-spot design has resistance range of 5 W to 33 kW and resistance ratios from 1:1-100:1.
Vishay's New Hermetically Sealed Ultra-High-Precision Bulk Metal® Foil Four-Resistor Network
MALVERN, Pa. - August 19, 2009 -Vishay Intertechnology, Inc. (NYSE: VSH) today announced a new ultra-high-precision Bulk Metal® Foil four-resistor network that offers excellent load life, load life ratio, and shelf life stability characteristics.
The hermetically sealed new SMNH resistor network features a load life stability of 0.005 % at 0.1 W per resistor at + 70 °C for 1000 hours and a load life stability ratio of 0.005 % (50 ppm). In addition, the device features excellent shelf-life stability per resistor of 0.0002 % (2 ppm) and a shelf life stability ratio of 0.0001 % (1 ppm) for at least six years. In addition to these tight stability characteristics, the SMNH combines a low absolute TCR of ± 2 ppm/°C typical from - 55 °C to + 125 °C, + 25 °C ref., TCR tracking of ± 0.5 ppm/°C typical, and a tolerance match down to ± 0.005 % (50 ppm) in an 8-pin, surface-mount, ceramic gull wing package.
The SMNH resistor network combines four independent Bulk Metal Foil resistors in a single surface-mount package. Offering better performance and more efficient use of board space than discrete resistors and matched sets, the device can be used independently or as divider pairs.
The ceramic gull wing package of the SMNH offers the advantages of electrical isolation on the underside of the device and high heat dissipation capability, while the network's hermetic sealing enhances its already inherently stable environmental performance.
With a wide resistance range of 5 W to 33 kW, the SMNH offers resistance ratios from 1:1 to 100:1. Vishay Foil resistors are not restricted to standard values, and can be specified to "as-required" values (e.g., 1.2345 kW vs. 1 kW) at no extra cost or delivery time.
While other resistor technologies can take several seconds or even minutes to achieve a steady state thermal stabilization, the SMNH network has an almost instantaneous thermal stabilization time of < 1 s, and a nearly immeasurable 1.0-ns rise time, effectively without ringing.
The device features a power rating of 0.4 W (or 0.1 W per resistor) at 70 °C, current noise of less than -40 dB, and a voltage coefficient of < 0.1 ppm/V. The network offers a non-inductive, non-hot-spot design, and the utmost in ESD immunity, withstanding electrostatic discharges up to 25 kV, for increased reliability.
All the resistors inside the SMNH are produced from the same proprietary Bulk Metal Foil alloy, of known and controllable characteristics. The alloys, which are not deposited by conventional techniques, are approximately 100 times thicker than conventional evaporated films. Vishay resistor elements are then photo-etched into a variety of resistive patterns in such a way that the resistance is adjustable to a standard tolerance of 0.01 % (100 ppm), and to 0.005 % (50 ppm) by request.
Through the entire process, every step is carefully controlled not only to keep the metal in its pure state, but also to eliminate the effects of any stress that might be imposed either during manufacture or use.
Vishay hermetic resistor networks are based on fabrication from a standing inventory of resistor chips. This permits quick delivery of prototypes since there are no masks to design or trial processing to be made. There are normally no engineering or setup charges, and no minimum quantities are required. The finished product provides the stability associated with Foil resistors in a miniature hermetically sealed package.
The network features gold-plated lead (Pb)-free terminations, and is available with Z-Foil technology for improved TCR to ±0.05 ppm/°C.
Samples and production quantities of the SMNH resistor network are available now, with lead times of two weeks for samples and five weeks for standard orders.
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. Company Information: Name: Vishay Intertechnology, Inc. Address: 63 Lincoln Hwy., P.O. Box 4004 City: Malvern State: PA ZIP: 19355 2143 Country: USA Phone: 610-644-1300 FAX: 610-296-0657 http://www.vishay.com
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