What Are The PCB Quality Standards? What Should Be Paid Attention To In PCB Quality Inspection Standard
In all market segments, especially those producing products in critical application areas, the consequences of such failures are unimaginable.
Keep these aspects in mind when comparing PCB prices.Although reliable, guaranteed and long-life products have higher initial costs, they are worth the money in the long run.
Here are the 14 most important features of highly reliable circuit boards:
1. Copper thickness of hole wall of 25 microns
benefits
Enhanced reliability, including improved expansion resistance on the Z-axis.
The risk of not doing so
Problems of electrical connectivity in the process of hole blowing or degassing (inner layer separation, hole wall fracture), or faults may occur under load conditions in actual use.IPCClass2 (the standard used in most factories) requires 20% less copper plating.
2, no welding repair or repair of broken repair line
benefits
Perfect circuit can ensure reliability and safety, no maintenance, no risk
The risk of not doing so
If not properly repaired, it will cause circuit board circuit break.Even if the repair is' proper ', there is a risk of failure under load conditions (vibration, etc.), which may result in failure in actual use.
3. Exceed the cleanliness requirements of IPC specification
benefits
Improving PCB cleanliness will improve reliability.
The risk of not doing so
Accumulation of residue and solder on the circuit board poses a risk to the welding layer, and ionic residue can lead to corrosion and contamination risks on the welding surface, which may lead to reliability problems (bad solder joints/electrical failures) and ultimately increase the probability of actual failures.
4. Strictly control the service life of each surface treatment
benefits
Solderability, reliability, and reduced risk of moisture intrusion
The risk of not doing so
Solder problems may occur due to metallographic changes in the surface treatment of older circuit boards, while moisture intrusion may lead to layering, inner layer and hole wall separation (open circuit) problems during assembly and/or actual use.
5. Use internationally known substrates -- do not use "local" or unknown brands
benefits
Improved reliability and known performance
The risk of not doing so
Poor mechanical properties mean that circuit boards do not perform as expected under assembly conditions. For example, high expansion properties can lead to layering, circuit breaking, and warping problems.Weakening of electrical characteristics can result in poor impedance performance.
6. The tolerance of copper-clad plates conforms to the requirements of IPC4101ClassB/L
benefits
Strict control of dielectric thickness can reduce the deviation of the expected value of electrical performance.
The risk of not doing so
Electrical performance may not meet specified requirements, and the same batch of components may have significant differences in output/performance.
