Thirteen major features of high reliability PCB
Whatever the internal quality is, the surface is almost the same. The internal differences is very important in the life of the PCB in the durability and function.Whether in the PCB manufacturing, PCB assembly process or in the actual use, PCB has to have reliable performance, which is vital. In addition to the related costs, the assembly process defects may be brought into the final product by the PCB, failure may occur during actual use.
When comparing PCB prices, you should keep
these aspects in mind. Although the initial cost of reliable, guaranteed and
long-lived products may be high, it is worth the money in the long run. Here's
a look at the thirteen most important features of a highly reliable circuit board
1）25 micron hole wall copper thickness
Benefit
Enhanced reliability, including improved
Z-axis resistance to expansion
The risk of not doing so
Electrical connectivity problems during
assembly (inner separation, hole wall rupture), or failure during actual use
under load conditions IPC CLASS2 (the standard adopted by most factories)
requires 20% less copper plating.
2）No circuit repair
Benefit
Perfect circuitry to ensure reliability and
safety, no maintenance, no risk
Not doing so
If the repair is improper, it will cause circuit
break
Even if repaired ' properly ', there is a
risk of failure in the load condition (vibration, etc.), which may cause
malfunction in actual use
3）High degree of cleanliness requirements
Benefit
Improve reliability
Not doing so
The residue on the PCB and solder build-up
will bring risks to the soldermask layer. Ion residue can lead to corrosion of
weld surface and risk of contamination
4）Strict control of each surface treatment, enhance service life
Benefit
Improve solder reliability, and reduce the
risk of humidity intrusion
Not doing
so
Metallographic change may occur, in
actual use may occur delamination, separate between inner layer and hole wall and
other issues
5） Use of
internationally renowned base material – do not use unknown brands
Benefit
Improved reliability and known performance
Not doing
so
Poor mechanical performance means that the
circuit board in the assembly conditions can not play the expected performance
For example, higher coefficient of
expansion will lead to delamination, circuit break and warping problems
6）PCB CCL Tolerances Meet IPC4101 CLASSB/L requirements
Benefit
Strict control of dielectric layer
thickness can reduce electrical performance deviation
Not doing so
If the electrical performance is not up to
the requirements, the same batch of components in the output/performance will
be big different
7）Define soldermask materials to ensure compliance with IPC-SM-840 CLASST
requirements
Benefit
Excellent ink, ensure ink security, to
ensure that solder layer ink compliance with the UL standard
Not doing so
Poor quality ink can
lead to adhesion, flux resistance and hardness problems All of these problems cause the solder layer to be detached from
the circuit board and eventually lead to corrosion of the copper surface. Poor insulation properties can cause short circuits due to accidental arcing.
8）Define tolerances for board profile, holes and other mechanical
characteristics
Benefit
Improve the size of the product quality
Not doing so
Problems in the assembly process, such as
alignment/coordination, in addition, due to the increase in size deviation,
mounting the base will also have problems
9）Requirements for thickness of solder layer
Benefit
Improve electrical insulating properties
and reduce the risk of peeling or loss of adhesion
Not doing so
Poor quality ink can lead to adhesion, flux
resistance and hardness problems
10）Requirements for appearance
Benefit
Better appearance, prove that the processing is careful
Not doing so
A variety of abrasions, minor injuries,
repair, circuit board can be used but not good-looking. Other than superficial
problems, what are the risks that you can't see?
11） Requirements
for depth of plug hole
Benefit
High-quality plug hole will reduce risk in
the assembly process
Not doing
so
Discontent in the hole can residual
chemical residue, resulting in solderability and other problems, and
there may be tin beads hidden in the hole. In PCB assembly or actual use, the tin bead may splash out, causing a short circuit.
12） Execute
specific procedure for each order
Ensure all custom PCB specifications have been
confirmed
13） Do not accept
X-out board
Benefit
Help customers improve assembly efficiency
Not doing so
X-out board requires special assembly
procedures. If the known bad board is assembled, it wastes parts and time
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Jeff