More than four and a half decades after its invention by physicist Dr. Felix Zandman in 1962, Bulk Metal® Foil (BMF) technology still outperforms all other resistor technologies available today for applications that require precision, stability, and reliability. Vishay's unique, ultra precision Bulk Metal Foil resistor products provide extremely low temperature coefficient of resistance (TCR) and exceptional long-term stability through temperature extremes.

The Vishay Foil Resistors portfolio comprises products in a variety of resistor configurations and package types to meet the needs of a wide range of applications: discrete resistors and resistor networks in surface mount and through-hole (leaded) configurations; customized chip resistor networks; precision trimming potentiometers; and discrete chips for use in hybrid circuits.

In 2000, Vishay achieved a technological breakthrough with the introduction of Bulk Metal® Z-Foil. Products built on this revolutionary technology deliver an absolute temperature coefficient of resistance (TCR) of 0.2 ppm/°C. The lower the TCR, the better a resistor can maintain its precise value despite ambient temperature variations and self-heating when power is applied. Vishay Bulk Metal Foil resistors are essentially non-inductive (less than 0.08 micro Henrys) and not capacitive, providing a rise time of about 1 nanosecond, making it particularly suitable for high frequency application. Furthermore, its thermal EMF is less than 0.05 µV/°C making it particularly important for low-ohmic DC applications.

With the award-winning Bulk Metal® Foil resistors, designers can significantly reduce circuit errors and greatly improve overall circuit performance. By taking advantage of the overall stability, high-frequency performance, and reliability of Bulk Metal® technology we can produce customer-oriented products designed to satisfy challenging technical requirements. Customers are invited to contact our Application Engineering Department with non-standard technical requirements and special applications (email: foil@vishaypg.com)