[Experience] What is high reliability?

First, what is reliability?

Reliability refers to "trustworthy" and "trustworthy", which refers to the ability of products to complete the specified functions under the specified conditions and within the specified time. For end products, the higher the reliability, the higher the use guarantee.

PCB reliability refers to the ability of bare board to meet the production conditions of subsequent PCBA assembly, and to maintain normal operation function in a certain working environment and operating conditions for a certain period of time.


Second, why should the high reliability of PCB be taken seriously?

As the carrier of various electronic components and the hub of circuit signal transmission, PCB determines the quality and reliability of electronic packaging. With the miniaturization, lightweight and multifunction of electronic products, and the continuous promotion of environmental protection requirements such as lead-free and halogen-free, the PCB industry is showing the development trend of "thin lines, small holes, multiple layers, thin boards, high frequency and high speed", and the requirements for reliability will be higher and higher.

High-reliability PCB can play a stable role as a carrier, realize the long-term and stable operation of PCBA, thus ensuring the safety, stability and service life of end products, and enterprises can further enhance their competitiveness, enhance their reputation, expand their market share and improve their economic benefits.


Third, how to evaluate whether PCB has high reliability?

High reliability is a practical science combining "engineering technology" and "management art". A set of "standardized, efficient, collaborative and controllable" management procedures must be established to stably produce high reliability PCB, which requires the factory to comprehensively control a series of influencing factors such as "engineering design, production materials, manufacturing equipment, process technology, quality assurance facilities, production environment, management system and team quality".

Therefore, to evaluate whether the PCB has "high reliability" needs to deeply confirm whether the following control items of the factory have been completely controlled.

Prevention mechanism

1) Engineering design: customer requirements for identification, information management, automation and specialized skills; Design standard specifications and correct manufacturability based on factory process capability; Work specification, process standardization, engineering production automation;

2) Manufacturing process: Systematize and manage the control objectives, operation processes and operation specifications of each process in the whole process;

3) Quality control management: standardize quality monitoring standards, improve the quality assurance system, and assist the process to improve quality;

2. Process management

1) Quality and product safety system: IATF16949, ISO9001, UL, CQC, RoHS；;

2) Engineering design: DFM specifications such as laminated structure, impedance, minimum line width, minimum spacing, minimum aperture and copper thickness; Production process design, material selection, manufacturability document design, etc.

3) Production materials: supplier evaluation, material evaluation, raw material inspection, raw material storage, etc.

4) Process technology: process capability, production parameters, liquid medicine usage, first piece FA, etc.

5) Equipment and facilities: evaluation, routine inspection, progress test, predictive maintenance, preventive maintenance, periodic maintenance, etc.

6) Working environment: dust-free, constant temperature, constant humidity, illumination, etc.

7) Quality monitoring: IQC for incoming materials, IPQC for process, IPQA for process, FQC for final inspection, OQC for outgoing goods, reliability test, etc.

8) Management team: operation specification, risk identification, problem analysis, strategy analysis, etc.

3. Quality assurance inspection

1) Quality yield: real-time monitoring;

2) Quality reliability: real-time/periodic verification;

3) Quality consistency: real-time/on-demand inspection;

4) Mean time between failures: periodic/on-demand verification;

4. Test and verification

1) Signal performance: impedance test and signal loss;

2) Heat resistance: thermal stress, Tg test and TMA test;

3) Interconnection performance: IST test, current resistance, cold and hot shock resistance;

4) Mechanical properties: peel strength, pull-off strength, solder mask hardness and adhesion;

5) Insulation performance: voltage resistance test, damp-heat insulation resistance test and CAF resistance test;

6) Welding performance: cleanliness test and weldability test;

7) Corrosion resistance: resistance to welding chemicals and porosity of gold finger.

About Maxipcb
Maxipcb inspires and empowers innovators and helps them bring world-changing technologies to life. We provide advanced design, simulation and testing solutions to help engineers complete development and deployment faster in the whole product life cycle, while controlling risks. Our customers are all over the world, such as communication, industrial automation, aerospace and national defense, automobile, semiconductor and general electronics. We join hands with customers to accelerate innovation and create a safe and interconnected world.