Seven important features of highly reliable PCB

- Sep 15, 2018-

7 of the most important features of the highly reliable circuit board

Copper thickness of hole wall of 1, 25 micron

Benefits: increased reliability, including improved z-axis expansion resistance.

The risk of not doing so

Blow-through or degassing, electrical connectivity problems during assembly (inner separation, hole wall rupture), or failure may occur under load conditions during actual use.IPCClass2 (the standard used by most factories) requires 20% less copper plating.

2. No welding repair or broken repair

Benefit: perfect circuit ensures reliability and safety, no maintenance, no risk

The risk of not doing so

If not repaired properly, the circuit board can be broken.Even if the repair is' appropriate ', there is a risk of failure under load conditions (vibration, etc.), which may occur in actual use.

3. Cleanliness beyond IPC specification

Benefit: improving PCB cleanliness increases reliability.

The risk of not doing so

The residue and solder accumulation on the circuit board will bring risk to the welding layer, and the ion residue will lead to the risk of welding surface corrosion and pollution, which may lead to reliability problems (bad solder spot/electrical fault) and eventually increase the probability of actual fault.

4. Strictly control the service life of each surface treatment

Benefits: solderability, reliability, and reduced risk of moisture invasion

The risk of not doing so

Solderability problems may occur due to metallographic changes in the surface treatment of the old circuit boards, and moisture intrusion may lead to problems such as delamination, inner layer and hole wall separation (disconnection) 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 performance means that the circuit board cannot perform its expected performance under assembly conditions, for example, high expansion performance will lead to delamination, circuit breaking and warping problems.Weakened electrical characteristics can lead to poor impedance performance.

6. The copper clad plates meet the IPC4101ClassB/L requirements

Benefits: strict control of dielectric thickness can reduce the expected value deviation of electrical performance.

The risk of not doing so

The electrical performance may not meet the specified requirements, and the same batch of components will differ greatly in output/performance.

7. Define the resistance welding materials to ensure compliance with ipc-sm-840classt requirements

Benefits: NCAB group recognizes "excellent" inks for ink security, ensuring that the solder mask inks meet UL standards.

The risk of not doing so

Poor quality ink can lead to adhesion, flux resistance and hardness problems.All these problems will cause the solder layer to break away from the circuit board and eventually lead to copper circuit corrosion.Poor insulation can be short-circuited due to accidental electrical connectivity/arcing.