What are the corrosion resistance and oxidation resistance of manganese copper alloy resistors and constantan alloy resistors, respectively?

The reason why alloy resistors are suitable for high-precision circuits is mainly attributed to their unique material properties and manufacturing processes, which make alloy resistors perform well in high-precision circuits. The following is a detailed explanation of the reasons why alloy resistors are suitable for high-precision circuits:

1、 Material characteristics
High precision: The manufacturing process of alloy resistors is complex, but they have higher precision. The accuracy of ordinary low resistance is generally 5%, 1%, while the accuracy of alloy sampling resistance can reach 1%, 0.5%, or even higher. This high precision enables alloy resistors to more accurately reflect changes in current and voltage in the circuit, thereby improving the accuracy of the entire circuit.
Low temperature coefficient: The temperature coefficient of alloy resistance is relatively small and less affected by environmental temperature. The common temperature coefficients are 25ppm, 50ppm, 75ppm, and 100ppm, which are much lower than the temperature coefficients of ordinary low resistance (such as 100ppm/200ppm). This means that the resistance value of the alloy resistor changes less when the temperature changes, thereby maintaining the stability of the circuit.
Resistance to high current impact: Due to its special alloy material, alloy resistors have good resistance to high current impact characteristics. This allows it to withstand large current fluctuations in high-precision circuits without being easily damaged.
Good stability: Alloy resistors have stable electrical properties and long service life. It has strong oxidation resistance, corrosion resistance, and wear resistance, and can maintain stable performance in harsh environments.
2、 Manufacturing process
Advanced manufacturing technology: The manufacturing process of alloy resistors has undergone years of development and optimization, forming multiple mature preparation processes. These processes make the size and structure of alloy resistors more compact, while maintaining high precision and stability.
Multiple packaging forms: Alloy resistors come in various packaging forms, commonly including 2512, 2010, 1206, 0805, 0603, etc. These sizes correspond to different power levels, such as 0.25W, 0.5W, 0.75W, 1W, 2W, 3W, 4W, 5W, 10W, etc. Choosing the appropriate packaging size is crucial for designing efficient and compact circuit boards.
3、 Application advantages
Current sampling: Alloy resistors are commonly used for high-precision current sampling. Due to its precise resistance and good temperature stability, it can provide accurate current feedback, thereby achieving precise control of current changes in the circuit.
Short circuit protection: In circuits, alloy resistors can also serve as short-circuit protection components. When a short circuit occurs in the circuit, the alloy resistor can quickly respond and limit the current, thereby protecting other circuit components from damage.
Impedance matching: Alloy resistors can effectively achieve impedance matching and achieve maximum power output during signal transmission. This helps to improve the efficiency and stability of signal transmission.
In summary, alloy resistors are suitable for high-precision circuits due to their high precision, low temperature coefficient, resistance to high current surges, good stability, advanced manufacturing processes, and various packaging forms. These characteristics enable alloy resistors to exhibit excellent performance in high-precision circuits, meeting the needs of various complex application scenarios.