The on resistance of FPC film key switches is one of the key indicators to measure their conductivity and reliability in use. Normally, its on resistance range is between 10 ohms and 100 ohms, with slight differences depending on material selection, process parameters, and structural design.

　　High on resistance can easily lead to trigger delay, unstable signal, or button failure. Youpin usually uses high conductivity silver paste as the circuit material, supplemented by stable carbon ink printing and coating processing technology, effectively reducing resistance value, improving overall response speed and anti-interference ability.

　　In FPC structural design, the routing, layer arrangement, contact area, and through-hole quality all affect the on resistance value. The multi-layer stacked structure needs to ensure that each layer's contact surface is pressed uniformly to avoid problems such as virtual soldering and oxidation that may cause fluctuations in resistance. In practical applications, controlling the conduction resistance within a reasonable range can effectively ensure accurate transmission of system signals and stable operation of products.

　　During the testing phase, the on resistance test uses specialized instruments for batch inspection to ensure that each key contact meets the design standards. To adapt to different usage environments, some products also need to undergo resistance stability verification under high temperature, high humidity, electromagnetic interference and other conditions to ensure long-term reliability.

　　The ability to control on resistance directly reflects the manufacturer's research and development level and manufacturing process, and has become an important reference indicator for measuring the quality of FPC film key switches.