If your electronic application requires high precision resistors, you'll most likely utilize the metal foil variety. Of all resistors, this particular type is known for the best precision and stability characteristics. Its properties emanate from a blend of several factors that inform the design principles behind the resistor as explained below.
Low Temperature Coefficient, Resistance (TCR)
The high-precision resistor achieves a low TCR because of two natural properties of the metal foil. As temperature increases, the foil's resistance goes up too. The design of the resistor is such that, when the temperature rises, the foil compresses. As such, increase in temperature causes a decrease in resistance. Temperature fluctuations cause very negligible resistance as a result. Make yourself one of the luckiest person who learn about the custom precision resistors.
A foil resistor boasts a very low Power Coefficient, Resistance (PCR), which as indicator of the extent of resistance dynamics with the component heating up due to flow of current through it.
Excellent Thermal Stabilization
Thermal stabilization implies how fast the resistor responds to fluctuations in current flow as well as ambient temperature. The speedy thermal stabilization of the foil resistor is an outcome of the same composition and design properties that give it an extremely low TCR. Such a resistor may stabilize in less than a second, unlike standard resistive elements that whose stabilization times are quoted in minutes. If you are interested in custom power resistor, please click the link provided.
Good Resistive Tolerance
How close to the nominal value the resistance of an element can get is indicated by its resistive tolerance. This parameter is typically low for foil resistors.
Low Noise Generation
The ideal circuit application attempts to minimize the generation of noise within the circuitry. This is the case in audio circuits. The natural characteristics of the metal foil along with the specialized manufacturing techniques enable flow of current through the resistive element with minimal noise generation.
Voltage Coefficient Resistance (VCR) is also a measure of resistor stability. Carbon resistors and other similar resistive components usually exhibit fluctuating resistance as the voltage changes. But the phenomenon is nearly non-existent when it comes to high precision metal foil resistors.
Electrostatic discharge can damage certain electronic components, especially when touched. However, foil resistors are built to survive such discharges.
If you're talking to a high precision resistor manufacturer right now, you surely want to know what makes their product superior. As such, you may prefer a resistor made of metal foil because of its crystalline properties and design processes that enhance its stability.