PCB is the core substrate of electronic products, and its quality and reliability directly affect the quality and reliability of electronic products. High reliability PCB can not only operate stably in harsh environments, but also extend the service life of electronic equipment.

Important features of high reliability PCB

1. Achieving a hole wall copper thickness of 25μm can enhance reliability, including improving the expansion resistance of the Z axis;

2. Perfect circuits can ensure reliability and safety. High reliability PCBs generally have no welding repairs or circuit break repairs, which can well avoid risks such as circuit board breakage.

3. Residues and solder accumulation on the circuit board will bring risks to the solder mask, and ionic residues will cause corrosion and contamination risks on the welding surface, which may lead to reliability problems such as bad solder joints/electrical failures, and ultimately increase the probability of actual failures. PCBs that exceed the cleanliness requirements of the IPC specification can improve their reliability.

4. The surface treatment of old circuit boards will undergo metallographic changes, and solderability problems may occur. Moisture intrusion may cause delamination, separation of inner layers and hole walls (open circuit) and other problems during the assembly process or actual use. Therefore, high-reliability PCBs will strictly control the service life of each surface treatment.

5. Poor mechanical properties mean that the circuit board cannot perform as expected under assembly conditions. For example, high expansion performance will lead to delamination, open circuit and warping problems. Weakened electrical properties can lead to problems such as poor impedance performance. Therefore, high-reliability PCB factories will use internationally renowned substrates, such as Shengyi, Jiantao, Lianmao and other well-known brands. KINJI PCB factory uses these substrates to ensure the high reliability of customer PCB products.

6. Since the electrical performance may not meet the specified requirements, the same batch of components will have large differences in output/performance. High-reliability PCB factories will strictly control the thickness of the dielectric layer to reduce the deviation of the expected value of electrical performance.

7. Poor quality inks can cause adhesion, flux resistance and hardness problems. All these problems will cause the solder mask to separate from the circuit board and eventually lead to corrosion of the copper circuit. Poor insulation properties can cause short circuits due to unexpected electrical connectivity/arcing. High-reliability PCB factories will strictly define solder mask materials to ensure compliance with IPC-SM-840 Class T requirements.

8. High-reliability PCBs will strictly define the tolerances of shape, holes and other mechanical features to improve the dimensional quality of the product - improving fit, shape and function.

9. Thin solder mask can cause adhesion, flux resistance and hardness problems. High-reliability PCB factories NCAB specify solder mask thickness, although IPC has no relevant regulations.

10. High-reliability PCB factories define appearance requirements and repair requirements, and carefully care and carefully cast safety during the manufacturing process to avoid various scratches, minor damage, repairs and repairs.

11. There are high requirements for plug hole depth, and high-quality plug holes are used to reduce the risk of failure during assembly.

High-reliability PCBs have strict requirements in material selection, design specifications, manufacturing processes, welding processes, environmental adaptability, and testing and verification. Only through multi-faceted optimization and strict control can high-quality circuit boards that can operate stably in various environments be produced. With the continuous advancement of technology, high-reliability PCBs will play an important role in more fields and provide more reliable electronic equipment for our lives and work.