Passives
Bulk Metal Foil Resistors from Vishay
Vishay Intertechnology has announced the improved S series of high-precision Bulk Metal foil (BMF) resistors, which provide a military-grade typical TCR of ±2ppm/°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 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 <0.1PPM/V; current noise of <-42dB; and thermal EMF of 0.05μV/°C. S series resistors offer fast thermal stabilization of less than 1 second, and a non-inductive (<0.08μH), 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.