How does metal foil resistance perform at high temperatures?

The performance of metal foil resistors at high temperatures is excellent, with the following significant characteristics:

1. Extremely low temperature coefficient (TCR): Metal foil resistors have an extremely low temperature coefficient, which means that even at high temperatures, the change in resistance value is very small. In the temperature range of -55 ℃ to+125 ℃, Z-foil resistors have a typical TCR of ± 0.2 ppm/° C, while in the temperature range of 0 ℃ to 60 ℃, Z-foil resistors have a typical TCR of ± 0.05 ppm/° C.
2. Power Factor (PCR): Metal foil resistors exhibit excellent power stability with minimal resistance changes at rated power applied.
3. Rapid thermal stability: Metal foil resistors can reach thermal stability within 1 second, which is crucial for applications that require rapid response.
4. Load life stability: At high temperatures, metal foil resistors exhibit excellent load life stability. For example, at an ambient temperature of 70 ℃ and a rated power load of 2000 hours, the typical change in resistance value is 25ppm, with a maximum change value of 200ppm.
5. High frequency characteristics: The resistance path pattern of metal foil resistors is designed as parallel geometric lines, effectively canceling out reactance and providing fast response time in high-frequency applications.
6. Low noise: The current noise of metal foil resistors is very small, less than -40dB, which is particularly important at high temperatures because it reduces noise interference in the circuit.
7. Thermoelectric potential effect: The thermoelectric potential effect of metal foil resistors is relatively small, with a typical value of 0.05 μ V/℃, which helps maintain the stability of the resistor at high temperatures.
8. Anti static ability: Metal foil resistors have good anti-static ability, which is particularly important in high temperature environments because it helps protect the resistor from static damage.
In summary, metal foil resistors can maintain high precision, stability, and reliability at high temperatures, making them an ideal choice for many high-temperature applications.