What are the differences between thick film resistors and alloy resistors?

Thick film resistors and alloy resistors are two different types of resistors, and they have some significant differences in material composition, preparation process, and performance characteristics:
1. Manufacturing process
Thick film resistor: Thick film resistors are made by printing resistor materials (usually conductive powders) on a resistor substrate in a relatively thick manner, and sintering and curing them at high temperatures. This manufacturing process is simple and the cost is relatively low.
Alloy resistance: Alloy resistance is defined by depositing a very thin metal alloy film on a substrate and then using processes such as chemical etching to determine the resistance value and size. This manufacturing process requires higher precision and control, so it may be relatively more expensive.
2. Accuracy and stability
Thick film resistors: usually have relatively low accuracy, and their resistance values may be affected by environmental factors such as temperature and humidity, resulting in generally poor stability.
Alloy resistors: Due to their manufacturing process and material characteristics, alloy resistors typically have high precision and stability, with resistance values relatively stable within a certain temperature range.
3. Temperature coefficient
Thick film resistors: typically have a high temperature coefficient, which means that the resistance value changes with temperature.
Alloy resistors: typically have a low temperature coefficient, which allows them to maintain relatively stable resistance values within a certain temperature range.
4. Power bearing capacity
Thick film resistors: typically have low power tolerance and are not suitable for high-power applications.
Alloy resistors: Some alloy resistors can have high power tolerance and are suitable for high-power applications.
5. Size and appearance
Thick film resistors: usually larger and may appear thicker in appearance.
Alloy resistors: Due to their manufacturing process, they are typically able to produce smaller and thinner sizes.
6. Application Fields
Thick film resistors: mainly used in home appliances, lighting, security and other fields. Due to its low cost and high precision, it has a wide range of applications in these fields.
Alloy resistors: widely used in communication, computer, automotive electronics, home appliances and other fields. Due to its wide resistance range and good stability, it has a wide range of applications in various high-precision electronic products.
In summary, thick film resistors and alloy resistors have some differences in manufacturing processes, accuracy, stability, temperature coefficient, power tolerance, and size. The selection of appropriate resistor components should be based on specific application requirements to ensure that the selected resistors meet performance and stability requirements.