[Hardware Engineer] can't select components?

         As a novice Hardware Engineer , First of all, we have to learn to understand the basic skill of hardware design circuit schematic , Experienced and handy , Can design hardware circuit .

         And we want to really understand the schematic , It is impossible to copy blindly , Sometimes I have to deduct details , For example, the selection of components 、 Power circuit design 、 Signal interconnection, etc , among , Component selection Is an important point .

         In addition to electrical performance, hardware engineers , You also need to know the information related to production and procurement . Component selection The heavy responsibility of hardware engineer , If the selected material is discontinued 、 Out of stock 、 The price is very high 、 Or the procurement cycle is very long , There is no mass production of that product , I can't even make a prototype .

         When hardware engineers choose components , First of all, we should consider whether the electrical performance and size can meet the design requirements , Then we need to see whether the price exceeds the industry average 、 Whether the delivery cycle can meet the needs of the project 、 Whether the cooperation relationship between the company and suppliers is normal .

Component selection General process of

         First of all, you choose from the materials in stock （ Give priority to the use of inventory materials ）;↓

         secondly , If there are ready-made materials with basically the same specifications , Just bring this material back for testing / Replace the original component debugging , If the test is OK , Consider adapting components according to requirements , Otherwise, continue to look for materials .↓

         If not , You can only order materials from related suppliers ( It is not recommended to customize materials with small demand , Small quantity is very expensive ).

        When we compare the specifications of components , If the company has not established a specification parameter table for comparison and analysis for this material , You can go to some electronic components distributor websites to check certain types of components , Then take the specifications listed in it as a reference , For example, the following three websites ：

1、 Dejie Electronics

Dejie Electronics China Digi-Key Official website | The supplier directly authorizes the distributor of electronic components https://www.digikey.cn/?utm_source=baidu&utm_medium=cpc&utm_campaign=Brandzone&utm_content=Brand%20Zone%20PC&utm_term=Headline

2、 Li Chuang mall  

Li Chuang mall _ Electronic components procurement online mall _ Leading spot component trading platform - Jialichuang electronic mall https://www.szlcsc.com/?c=Z

3、 Tradeze Electronics

Electronic components distributor - Mouser Electronicshttps://www.mouser.cn/?utm_source=Baidu%20Brandzone&utm_medium=cpc&utm_campaign=Brandzone%20Main&utm_term=title

Basic principles of component selection

Basic principles of component selection ： choice Universal Of 、 Cost effective materials .

How can materials be universal ？

1、 Common in the market , For example, a device is in a mobile phone 、 The notebook 、 Industry , The dosage is very large , That must be very general ;

2、 Common in the industry , Such as micro connector in mobile phone industry , In the laptop industry LVDS Line , And general materials for other sub industries ;3、 Common in the company , Such as previous products （ The shipment volume is large ） Used materials , Verified by our market customers .

Why choose general materials first ？

1） The price is low . General materials are either shipped in large quantities , Or it has been out of the market for a long time , R & D cost 、 Mold cost 、 The cost of automata is basically apportioned , Suppliers make money by selling one more share , So the price is easy to talk about ;

2） Easy to purchase . Because universal , Suppliers usually do regular inventory preparation , Even if the product suddenly increases, the supplier can supply the goods , In time, there is no agent , It is also convenient to go to other agents to coordinate the purchase , Or the market catches the spot ;

3） Stable quality . Because the quantity is big enough , The problems that have happened have basically happened before , All improved , So the quality is stable .

Selection sequence of components

1、 Try to choose company components Materials in the warehouse ;

2、 Try to choose A lot of materials used by the company , Such as products shipped in large quantities 、 Similar or identical circuits ;

3、 According to the product type of our company , To suppliers PM consulting , Know what suppliers recommend Material application scenarios , For example, which customers are shipped 、 How many shipments , It is better that the products in use are of the same type as our products ;

4、 Ask for the material problem resume , Avoid existing problems in time ;

PS： If it is a very important product , And if the demand is large , It is recommended to go to the supplier A field trip , Confirm the problem resume on site 、 Production process yield and shipment 、 Shipment customer data .

For the test prototype , The price has little effect , The focus is on delivery . As long as it can be bought and delivered , Everyone can afford to be a little expensive . The number of test prototypes is generally small , Several dozens , It doesn't matter if the unit price is more expensive , As long as you can buy , You can use it . This concept is mainly aimed at industrial and consumer product design , For military grade products, the cost of a single material may be much higher than that of consumer grade , It is necessary to choose high-value materials carefully .

Here refers to the test prototype , Just a machine for technical verification , Instead of the engineering prototype in the normal project process . The engineering prototype should use the final materials as much as possible , Change materials in the process of technology development , Especially the replacement of key materials , It will bring great project risks .

Minimum package , It means when purchasing components in batches , How many pills do you need to buy at least once .