What are the performance and technical requirements of the circuit board?

The performance and technical requirements of the circuit board are related to the structure type of the circuit board and the selected substrate. Different types (rigid and flexible), different structures (single-sided, double-sided, multi-layer, with or without blind holes, buried holes, etc.), different substrates of PCB boards, performance indicators are different. Its performance level, like product design, is usually divided into three levels according to the scope of use, PCB manufacturers describe the complexity of the product, the degree of functional requirements and the frequency of testing and inspection. The acceptance requirements and reliability of products of different performance levels increase according to the level.

Level 1 - General electronic products: mainly consumer electronic products and some computers and peripherals. There are no strict requirements for the appearance of this type of PCB board, and the main requirement is that there should be complete circuit functions to meet the requirements of use.

Level 2 - Dedicated service electronic products: including computers, communication equipment, complex commercial electronic equipment, instruments, meters and some use requirements are not very demanding products. This kind of product requires a long life and requires uninterrupted work, but the working environment is not bad. The appearance of some products is not perfect, but the performance should be intact and have a certain reliability.

Level 3 - High reliability products: including equipment with strict continuous performance requirements, equipment that does not allow downtime during operation, and equipment used for precision weapons and life support. PCB processing printed board is not only functional integrity, requires uninterrupted work, and can work normally at any time, has a strong environmental adaptability, and should have a high degree of insurance and reliability. For such products, strict quality assurance measures should be taken from design to product acceptance, and some reliability tests should be done if necessary.

PCB board processing out of different levels of PCB suppliers in not all the performance requirements are different, some performance requirements are the same, some performance indicators of the degree of rigor and accuracy, tolerance and reliability requirements are different. The performance requirements of PCB processing manufacturers mainly include appearance, size, mechanical properties, physical properties, electrical properties, chemical properties and other properties. The following will be based on IPC-A-600G and IPC-6011 series standards, according to the performance of these aspects are introduced. The performance indicators that are not specifically stated are the same for all levels of products, and different requirements will be explained separately.

In order to more clearly show the quality status of the product at the time of acceptance, and give a more intuitive description, the quality status of the printed board in the IPC-A-600G standard is divided into ideal, accept and reject three states:

Ideal state: A desired state, close to perfect but attainable. In fact, because the design quality and processing level of printed board graphics are generally not easy to achieve, the ideal state is not a necessary requirement for reception.

Receiving status: It is the basic requirement to ensure the necessary functional integrity and reliability of PCB board manufacturers under the conditions of their use, but it is not necessarily perfect, and it is the basic condition for product reception. The receiving status of different levels of products, some items are the same, and some items are different, which are described exclusively in the article.

Reject state: A state that exceeds the minimum requirements for receiving, and the printed board in this state is not sufficient to ensure the performance and reliability of the product under the conditions of use. For different grades of products and different acceptance items, the conditions for rejection may be different.