PCB News - The smt factory teaches you how to select electronic components correctly

The smt factory teaches you how to select electronic components correctly
The PCB factory teaches you how to select electronic components correctly, because now friends who are doing electronic processing will encounter the problem of electronic component procurement. If there is only a research and development team but not a buyer who understands the processing; then at this time, the selection of electronic components Sometimes it will be more headache. The following smt factory editor will introduce this content, please see below:

The smt factory teaches you how to select electronic components correctly

1. The importance of electronic component selection

Baiqiancheng smt factory engineer said that the size, product model and basic parameters of each electronic component are marked on the circuit diagram, which is the basis for the selection of electronic components. For products that have been formed, the electronic components marked on the schematic circuit diagram are put into production and processing after design, research and development, and each basic parameter is confirmed according to the method of "qualitative analysis, quantitative estimation, and experimental adjustment". Under normal circumstances, whether the electronic components used are allowed to be replaced or not. However, for the developers of electronic equipment, amateur enthusiasts, and maintenance workers, due to the influence of many factors such as objective reasons, under the condition of meeting the technical specifications and standards, due to the small amount of use, electronic components can also be used flexibly.

In some special situations, even if you have a schematic diagram of the circuit, some electronic components are marked with incomplete basic parameters, such as electrolytic capacitors that only mark the capacity and not the breakdown voltage, so they must be reconsidered in the power circuit; commodity application field conditions and technical data If you don’t meet the requirements, you can change part of the electronic components to integrate them into reality; if an electronic component is difficult to buy locally, you can choose an electronic component that meets the standard to substitute; if an electronic component is found to be unreasonable during the maintenance process, you must replace it with a suitable one Of electronic components.

Baiqiancheng smt factory engineers introduced that electronic components are circuit basic units that perform predetermined functions without being detachable and refined, such as resistors, semiconductor discrete components, semiconductor integrated circuit chips, microwave electronic components, "auto relay", magnetic electronic components, and control switches, Electrical connectors, filters, temperature sensors, fiber optic components, etc. Practice has proved that in electronic products, 44% to 67% of the total failure of electronic components is caused by improper selection, and the failure rate caused by the quality of electronic components accounts for 33% to 46%. Therefore, the selection of electronic components occupies a key position in circuit design, and the design staff must attach great importance to it.

Second, the selection criteria of electronic components

1. Select standard electronic components from manufacturers with stable quality, high credibility, development prospects, and good reputation that have been proved by practice. Obsolete or counterfeit electronic components should not be used.

2. The technical characteristics, quality level, and application conditions of electronic components should meet the requirements of the design circuit.

3. Baiqiancheng smt factory engineers said that under the condition of meeting the performance indicators, it is necessary to choose electronic components with low power consumption, low thermal resistance, low loss, high power gain, and high efficiency.

4. Selection of domestic electronic components. It is preferable to select electronic components that have been certified and identified in compliance with international standards; electronic components that have been honed in application and that can meet the requirements and can be delivered stably; and other electronic components that have successful use experience and meet the requirements.

5. Imported electronic components. Electronic components in the PPL (selected product list) and QPL (qualified product list) of overseas authoritative departments; high-reliability electronic components that have been rigorously screened during processing; high-quality that has passed the domestic application evaluation and meets the requirements Of electronic components.

6. Baiqiancheng smt factory engineers said that the selection should be based on the principles of standardization and generalization.

Three, the selection of electronic components

Electronic components are preferred, and the preferred practical manual of the product or the preferred product list (PPL) issued by the overseas authority should be applied. Design staff should formulate precise and clear technical specifications for purchasing electronic components. In order to ensure credibility requirements, the specifications should establish countermeasures and methods for screening (including re-screening) and quality consistency inspection. At the same time, a qualified electronic component purchase order should be drawn up according to the model specifications.

Baiqiancheng smt factory engineers introduced that the factors affecting the credibility and quality of electronic components must be specified in the purchase order, such as quality level, environmental conditions, failure rate, technical specifications, packaging types, precautions (anti-static characteristics, Integrated ic protection processing technology, etc.), production suppliers, etc. Purchasing specifications shall be implemented after being reviewed according to regulations. After the application of electronic components in the product is clear, its credibility should be estimated, and it should be considered whether it meets the credibility standards of the circuit to the electronic components.

Our factory is an enterprise specializing in SMT chip processing, DIP common processing, PCBA package labor and materials,PCB circuit boardmanufacturing. It has many years of experience in electronic processing, as well as advanced production equipment and a complete after-sales service system. If you don’t want to bother, you can also directly contact us for PCBA package labor and material one-stop electronic processing, assembly and shipment. The smt factory teaches you how to correctly select electronic components and introduces it here. If you have related needs, please feel free to contact us at any time, thank you.