• 0086-0755-29098288
  • okey@okpcb.cn
Instant
Quote
Your position:Home >> Count the fourteen major features of high-reliability PCBs.
Count the fourteen major features of high-reliability PCBs.

At first glance, PCBs are similar in appearance, regardless of their intrinsic quality. It is through the surface that we see differences that are critical to the durability and functionality of the PCB throughout its lifetime.


Whether in the manufacture of assembly processes or in actual use, PCB must have reliable performance, it is crucial. In addition to the related costs, defects in the assembly process may be brought into the final product by the PCB, which may cause malfunctions during actual use resulting in a claim. So, from this point of view, it's no exaggeration to say that the cost of a high quality PCB is negligible. In all segments of the market, especially in the production of key applications of products in the market, the consequences of such failures can be disastrous.

When comparing PCB prices, these aspects should be kept in mind. While reliable, long-lived, guaranteed products have high initial costs, they are worth the long run. Let's take a look at the 14 most important features of high reliability boards:

Hole wall copper thickness of 1,25 microns

Benefits:

Increased reliability, including improved z-axis expansion resistance.
The risk of not doing this:
Blow holes or outgassing, electrical connectivity issues during assembly (inner separation, hole wall fracture), or under load conditions during actual use. IPCClass2, the standard used in most plants, requires less than 20% copper plating.
2, no welding repair or open circuit repair line
Benefits:
Perfect circuit to ensure reliability and safety, no maintenance, no risk
The risk of not doing this
If not properly repaired, it will cause the circuit board to open. Even when properly repaired, there is a risk of failure under load conditions (vibration, etc.) that may cause malfunctions in actual use.
3, exceed the IPC standard cleanliness requirements
Benefits
Improve the cleanliness of the PCB can improve reliability.
The risk of not doing this
Residues and build up of solder on the board pose a risk to the solder mask and ionous residues cause corrosion and contamination risks on the soldered surfaces, which can lead to reliability issues (bad solder joints / electrical faults) and ultimately increase the occurrence of actual faults Probability.
4, strictly control the life of each surface treatment
Benefits
Solder resistance, reliability, and reduce the risk of moisture intrusion
The risk of not doing this
Due to the metallurgical changes that occur on the surface of the old circuit board, soldering problems may occur, and moisture intrusion may cause problems such as delamination during assembly and / or practical use, separation of the inner and cell walls (open circuit), etc. .
5, the use of internationally renowned substrate - do not use "local" or unknown brand
Benefits
Improve reliability and performance
The risk of not doing this
Poor mechanical properties mean that the circuit board can not perform as expected under assembled conditions, for example, high expansion properties can cause delamination, open circuit and warpage problems. Weakened electrical characteristics can lead to poor impedance performance.
6, CCL tolerance in line with IPC4101ClassB / L requirements
Benefits
Strict control of dielectric thickness can reduce the deviation of the expected value of electrical properties.
The risk of not doing this
Electrical performance may not meet the requirements, the same batch of components in the output / performance will have greater differences.
7, define the solder mask material, to ensure compliance IPC-SM-840ClassT requirements
Benefits
"Fine" inks to achieve ink safety and ensure that the solder mask ink meets UL standards.
The risk of not doing this
Poor ink can lead to adhesion, flux resistance and hardness problems. All of these problems cause the solder mask to detach from the circuit board and eventually lead to corrosion of the copper circuit. Poor insulation properties can cause short circuit due to unexpected electrical continuity / arc.
8, to define the shape, hole and other mechanical characteristics of tolerances
Benefits
Strict control of tolerance can improve the quality of the product size - to improve the fit, shape and function
The risk of not doing this

Problems in the assembly process, such as alignment / mating (pressure fitting needles are only found when the assembly is complete). In addition, there is a problem with loading the base due to increased dimensional variations.


9, the thickness of solder mask requirements, although there is no IPC relevant provisions


Benefits


Improve electrical insulation properties, reduce the risk of flaking or loss of adhesion, and increase the ability to withstand mechanical impacts - no matter where the mechanical impact occurs!


The risk of not doing this


Thin solder mask can lead to adhesion, flux resistance and hardness problems. All of these problems cause the solder mask to detach from the circuit board and eventually lead to corrosion of the copper circuit. Due to poor insulation properties caused by thin solder mask may be caused by unexpected conduction / arc short circuit.


10, the appearance of the requirements and repair requirements, although the IPC is not defined


Benefits


Carefully crafted in the manufacturing process and carefully cast safety.


The risk of not doing this


A variety of abrasions, small injuries, repairs and repairs - the circuit board can be used but not look good. In addition to the surface can see the problems, what are the risks can not be seen, as well as the impact on the assembly, and in actual use of the risk?


11, the depth of the plug hole requirements


Benefits


High quality jacks will reduce the risk of failure during assembly.


The risk of not doing this


Hole dissatisfied with plug holes can remain in the process of gold residue chemical residues, resulting in solderability and other issues. And the hole may also hold tin beads, in the assembly or actual use, tin beads may splash out, resulting in short circuit.


12, designated peel blue brand and model


Benefits


The designation of peelable blue glue avoids the use of "local" or cheap brands.


The risk of not doing this


Poor or cheap peelable glue may blister, melt, crack, or coagulate like concrete during assembly, so that the peelable gel does not peel / inoperative.


13, perform a specific approval and order for each purchase order


Benefits


Execution of this program ensures that all specifications have been confirmed.


The risk of not doing this


If product specifications are not carefully confirmed, the resulting deviation may not be detected until the assembly or final product, and it is too late.


14, do not accept scrap units of the board


Benefits


Not using local assembly can help customers improve efficiency.


The risk of not doing this


Defective sleeves require special assembly procedures, and if the x-out is not clearly marked, or if it is not isolated from the board, it is possible to assemble the known bad board Waste parts and time.

contact us:

okey@okpcb.cn


TOP
Online Service