What factors are related to the accuracy of thin film precision chip resistors

The accuracy of thin film precision chip resistors is affected by various factors, including but not limited to the following aspects:

1、 Material factors
Resistance material: The composition of the resistance material of thin film precision patch resistors has a direct impact on their accuracy. Metal film materials are often used to manufacture high-precision resistors due to their good stability and low temperature coefficient. The resistivity of different metals or metal compounds varies, which affects the accuracy of the resistance.
Material purity: The higher the purity of the material, the better the stability of the resistance value and the higher the accuracy. Impurities and defects may cause changes in resistance values, affecting accuracy.
2、 Manufacturing process
Thin film process: Thin film process is one of the key technologies for manufacturing precision surface mount resistors. The thickness, uniformity, and adhesion of the film can all affect the accuracy of the resistance. Precise thin film technology can ensure the stability and high precision of resistance values.
Forming, sintering, electroplating and other processes: These processes all have an impact on the accuracy of resistors. For example, the control of sintering temperature and time, as well as the thickness and uniformity of the plating layer, can all affect the stability and accuracy of the resistance value.
3、 Environmental factors
Temperature: Temperature is one of the main factors affecting the accuracy of resistance. The resistance value of a resistor changes with temperature, which is called the temperature coefficient. In order to reduce the impact of temperature on resistance accuracy, manufacturers usually take temperature compensation measures.
Humidity: In high humidity environments, resistors may absorb moisture, thereby changing their resistance value. Therefore, humidity control is also one of the important measures to ensure the accuracy of resistance.
4、 Other factors
Mechanical stress: When surface mount resistors are subjected to mechanical stress such as vibration or impact, their structure may undergo minor changes, which can affect the resistance value. Therefore, the influence of mechanical stress needs to be considered in the design and use process.
Time: Over time, the resistance value of the patch resistor may drift, known as aging. Aging is caused by chemical or physical changes in the internal materials of resistors. To reduce the impact of aging, manufacturers typically use high-quality materials and optimized manufacturing processes.
In summary, the accuracy of thin film precision surface mount resistors is influenced by materials, manufacturing processes, environmental factors, and various other factors. To ensure high precision and stability, manufacturers need to strictly control these factors and adopt advanced manufacturing processes and technologies. Meanwhile, it is also necessary to pay attention to the influence of environmental factors and mechanical stress during use to ensure the long-term stability and reliability of the resistor.