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  • VSM Series
  • VSMP Series
  • S Series
  • RTD Simulator
  • FRSM Series
The electronics industry has evolved at a remarkable rate over the past three decades. New techniques and advances have helped shrink equipment size and have put pressure on manufacturers of discrete components to develop devices that approach the ideal in performance and reliability. Among these devices are chip resistors, which remain in high demand today and are among the basic building blocks for many circuits. They are more space efficient than discrete encapsulated resistors and require less preparation prior to assembly. As they have grown more popular, their capabilities have also become more important.
Key parameters include electrostatic discharge (ESD) protection; thermal electromotive force (thermal EMF); temperature coefficient of resistance (TCR) and self-heating properties; long-term stability; power coefficient; and noise. In the technology comparisons that follow, wirewound resistors are discussed for their use in precision circuits. But it should be remembered that wirewound resistors are not available in true chip form (chip without a molding), and therefore are not usable in applications where weight and size limitations demand precision in the chip resistor format. Although the overall system performance is improved by upgrading each component or subsystem, it is nevertheless true that overall performance is still determined by the weakest link in the chain. Each component comes to the system with built-in trade-offs that limit overall performance, with particular concern over short- and long-term stability, frequency response, and noise. In the discrete resistor industry, advances have been made in wirewound, thick film, thin film, and foil resistor technologies, with each offering various trade-offs in performance per unit cost.
Counterfeit precision resistors have inundated the electronics market and caused confusion about the differences between actual and published specifications. In the last few months we have found cases of counterfeit foil resistors as well. It is said that imitation is the sincerest form of flattery. But counterfeiting is a crime, and the consequences of substituting fake resistors for real Bulk Metal® Foil resistors in analog circuits, systems, and programs can be very grave indeed. The consequences are failure in a circuit or project — not just legal consequences for using counterfeits. Just because the devices look like foil doesn't mean that they perform anywhere close to the real foil resistors or have the same reliability. That's why it is more important than ever to verify that the foil resistors you're using are in fact the high-precision devices you believe them to be. The foil resistors available here are the most popular precision resistor products used by analog circuit designers in the most demanding circuit applications. Because design engineers depend so heavily upon the performance of these unique products and require a short lead time, the Resistors4U Express Hubs make it easier than ever to obtain these precision resistors within a few days.

Resistors 101

Watch how much stability counts!

How to trim Bulk Metal® foil resistors

Learn how our resistors can be trimmed to virtually any desired resistance value — the Precision Center principle

Bulk Metal® is a registered trademark of Vishay Precision Group, Inc. (VPG)