Metal foil resistors have been the star of the resistor industry from design to development. It uses a special metal foil material, and it is strictly controlled in the production process, so that its performance is far higher than other resistors. It is no exaggeration to say that high-precision metal foil resistor is an ultra-precision resistor. So what are the advantages and characteristics of this resistor? We have compiled the advantages and characteristics of the metal foil resistor.

 
First, the metal foil resistor has a very small temperature coefficient of resistance
Since the foil resistor has the function of automatic compensation of the temperature coefficient, and through major technical improvements such as material processing and product structure design, the temperature coefficient of resistance can be made close to zero within the operating temperature range.
 
Second, the metal foil resistor has high stability and high reliability.
Since the resistor material of the metal foil resistor has the property of a bulk metal, its stability and reliability are excellent. Its shelf life stability is <25ppm/year and <50ppm/3 years. For sealed products, it can be <5ppm/year and <10ppm/3 years.
 
Third, the metal foil resistor has high precision
The semi-sealed metal foil resistor has an accuracy of ±0.005% and a fully sealed foil resistor of ±0.001%.
 
Fourth, very small current noise and nonlinearity
Because metal foil resistors have the properties of bulk metal, the current noise and nonlinearity of this type of resistor are very small, the voltage coefficient is typically <0.1ppm/v, and the current noise is less than -40db. These performances are better than those of the US military. The requirements set by the standard are much better.
 
Five, very small distributed inductance and distributed capacitance
 
Since the metal foil resistor adopts a planar structure, its distributed inductance and distributed capacitance are small, and the typical value of the inductance is <0.08 μH, and the capacitance is <0.5 PF.
 
Sixth, high frequency characteristics, good advantages
When the resistance is about 1KΩ and the frequency is 100MHz, the resistance between AC and DC is very small. 10KΩ is used for f=20MHz, and there is almost no change. Even when the 50KΩ foil resistor is used for 5 MHz, there is little difference. This is much better than wire winding for only 50 KHz.
 
Seven, the advantage of high speed response
The metal foil resistor has an impulse response time of less than 0.1 ns and hardly produces amplitude oscillating. Compared with the wirewound resistor, the metal foil resistor produces a reduced amplitude oscillation of almost zero, while the wirewound resistor has a certain amplitude fluctuation.

 
The above is the main feature of metal foil resistors. Its advantages and characteristics can be said to be a model of high-precision resistors. At present, there are more and more demand for metal foil resistors in many high-precision instruments and aerospace fields. As technology advances, resistance such as this kind metal foil resistors will increase.