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Vishay’s Improved S-Series High-Precision Bulk Metal® Foil Resistors Combine TCR of ±2.0 ppm/°C, Tolerances of ±0.005 % (50 ppm) and Load Life Stability of ±0.005 % (50 ppm)
New Devices Deliver High Reliability, Long Lifetimes, Stable Operation in Harsh Conditions, and Instantaneous Thermal Stabilization Time
MALVERN, Pa. — July 30, 2008 — Vishay Intertechnology, Inc. (NYSE: VSH) today announced the improved S series of high-precision Bulk Metal® foil (BMF) resistors, which provide a military-grade typical TCR of ±2 ppm/°C from -55 °C to +125 °C, +25 °C ref., tolerance of ±0.005 %, and load life stability of ±0.005 % for more than 10,000 hours.
The S series comprises 12 model numbers with resistance values from 0.5 Ω to 1 MΩ, with any resistance value available at any tolerance within the resistance range at no additional cost or lead time effect. The devices are rated for power levels up to 2 W at 70 °C and can withstand electro-static discharges (ESD) in excess of 25 kV. Rise time for the S series devices is a nearly immeasurable 1 ns without ringing.
Devices in the S series are built to handle unconventional environmental conditional conditions with minimal drift, making them well suited for military/space applications according to EEE-INST-002 specifications and MIL-PRF 55182. The ultimate resistor component for analog applications, the construction of S series resistors guarantees a high level of reliability, stable operation in harsh conditions, and high resistance to thermal shock, mechanical shock, and vibrations. Each S series resistor undergoes a short time overload test of 6.25 times the rated power during the manufacturing process.
The new devices are resistant to moisture as well, and are designed with a coating and molding compound that provides water proofing, moisture proofing, and mechanical damping, as well as a path for heat dissipation.
The S series allows designers to achieve much better performance by combining a range of high-precision specifications in a single device. In addition to its low TCR, tolerance, and load life stability values, the S series offers a low voltage coefficient of < 0.1 PPM/V; current noise of < -42 dB; and thermal EMF of 0.05 μV/ °C. S series resistors offer fast thermal stabilization of less than 1 second, and a non-inductive (< 0.08 μH), non-capacitive design.
Typical applications for the S series devices will include dc-to-dc converters, feedback circuits, and precision amplifiers in test and measurement instrumentation, medical systems, satellites and aerospace systems, commercial and military avionics, weapons systems, audio systems, and high-temperature systems including down-hole drilling.
Both leaded and surface-mount (SMR1D and SMR3D) S series resistors are available now, with lead times of 72 hours for samples, and three weeks for standard orders.
Vishay Precision Group Inc. has ceased to be a subsidiary of Vishay Intertechnology Inc. and is an independent publicly owned company.