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MALVERN, PENNSYLVANIA — Feb. 27, 2012 — Vishay Precision Group, Inc. (NYSE: VPG) today announced that its Vishay Foil Resistors division (VFR) has released new hermetically sealed precision resistor network devices (PRND) with a screen/test flow in compliance with EEE-INST-002 (Tables 2A and 3A, Film/Foil, Level 1) and MIL-PRF-83401. For high-reliability military and aerospace applications such as satellites, space rovers and deep-space probes, the PRNDs provide low absolute TCR of ±2 ppm/°C typical from -55°C to +125°C, +25°C ref., load-life stability to ±0.05% typical, and a load-life ratio stability of ±0.02% typical at +70°C for 2,000 hours at rated power.
Custom configured to requested circuit schematics and specifications, VFR’s EEE-INST-002-compliant PRNDs are hermetically sealed networks consisting of multiple Bulk Metal® Foil hybrid chips resistors connected by gold-wire bonding inside ceramic packages. Utilizing Bulk Metal® Foil technology, PRNDs assure extraordinary performance due to their fundamentally low TCR, excellent tolerance matching and tracking, and very small drifts with load over time. In fact, typical performance for PRNDs ranges up to 15 times better than the requirements of the MIL-PRF-83401 spec.
The combination of the PRND’s ceramic package – which has the advantage of electrical isolation on the underside and high heat dissipation capability – hermetic sealing, and the arrangement of the chips within the package, helps preserve uniform conditions inside it for maximum environmental protection. The result is improved load life stability and better performance for high-temperature and high-moisture environments.
Offered in dual-in-line (DIP), flatpack, gull wing, and leadless chip carrier (LCC) package configurations, the PRNDs feature a wide resistance range from 5 Ω per chip, with lower and higher values available with tolerance matching to ±0.005%. Any resistance value within this range is available at any tolerance with no additional cost or lead time effect. The devices provide a power rating to 1.4 W per package (150 mW per resistor) at an ambient temperature of +70°C.
The resistor networks feature a rise time of 1.0 ns, with effectively no ringing, a thermal stabilization time of < 1 s (nominal value achieved within 10 ppm of steady state value), current noise of 0.010 µVrms per volt of applied voltage (< -40 dB), a voltage coefficient of < 0.1 ppm/V, and a shelf-life stability of ±2 ppm typical after at least 6 years. Offered with gold-plated terminations, the devices provide a non-inductive (< 0.08 μH), non-capacitive design.
VFR's hermetic networks are based on fabrication from a standing inventory of packages and resistor chips. This permits quick delivery of prototypes since there are no masks to design or trial processing to be made. Further, it allows a large combination of values, tolerances, and circuits. The chip and wire approach allows for standard or custom schematics with no engineering or setup charges, and with no minimum quantities required.
Samples and production quantities of the EEE-INST-002-compliant PRNDs are available now, with lead times of eight weeks for standard orders.
About Vishay Foil Resistors
Vishay Foil Resistors is a division of Vishay Precision Group, producing the most precise and stable resistors available. The portfolio comprises products in a variety of resistor and package configurations to meet the needs of a wide range of applications: discrete resistors and resistor networks in surface mount and through-hole (fixed-lead) configurations; customized chip resistor networks; precision trimming potentiometers; and discrete chips for use in hybrid circuits. The foil resistors and current sensors are used in applications requiring a high degree of precision and stability, such as in medical testing equipment, high performance audio equipment, precision measuring instruments, aerospace, and military applications.
About Vishay Precision Group
Vishay Precision Group (VPG) produces sensors based on precision resistive foil technology, and sensor-based systems. It provides vertically integrated products and solutions for multiple growing markets in the areas of stress, force, weight, pressure and current measurements. As a spin-off from Vishay Intertechnology, VPG’s decades-long track record encompasses innovations in precision foil resistors, current sensors, and strain gages, which have served as a foundation for VPG’s more recent expansion into strain gage instrumentation, load cells and transducers, weighing modules and complete systems for process control and on-board weighing. Vishay Precision Group may be found on the Internet at www.vishaypg.com