How to Avoid Pitfalls in Purchasing Electronic Components
Recently I have seen many stories about purchasing electronic components on the Internet , the discussion is about the process of purchasing electronic components There have been a series of accident cases. Among them, there are problems with counterfeit goods, lack of professional knowledge, insufficient work experience, Wrong model purchased, etc. , so placing an order is like betting , every order was placed with trepidation.
To this end, here are some of the most common mistakes in the purchase of electronic components, and give solutions method , so as to avoid falling into traps in the future when purchasing electronic components.
1. A model has more than one package, package order under the wrong.
The letters of the complete suffix of the model number of an electronic component already cover the parameters of the component, including the size of memory, voltage, form of encapsulation, form of packaging and so on. But! Some components do not follow the rules, and can be packaged in a variety of ways for a single model number. By the time our suppliers arrive, it’s too late. This not only delays the production of the product, which in turn delays the delivery date; and encountered some suppliers in addition to the quality of the reasons for not arranging the return of goods, which will cause direct losses to the company.
2. No clear brand is provided , brand purchasing error.
Most purchasers have a common misconception about components, thinking that a model number corresponds to a brand. But yes! Electronic components but not according to common sense out of the mess factor, some models, but also really partial to a few brands.
Although most of the materials, different brands can also be common with each other; but due to the shipment of products and customer sealing samples there is an entry, so you need to bear the risk that may be returned by the customer.
However, in the work of purchasing, suffix type purchasing errors are the most common. Most purchasers , when comparing After checking the model, brand and packaging, I thought there was no problem and placed the order directly. The difference of one word can make a huge difference.
3. Suffixes will always be a mystery
For integrated circuits, each suffix has its own significance. Most of the suffixes identify the component’s memory size, speed, package, packaging, environmental protection, etc., which can’t be ignored.
4. Medium body, narrow body, wide body I can’t figure it out
Purchasing components requires aligning the package, brand, model, and suffix, which is already troublesome enough. What’s even more frustrating is that there are So-called medium body and narrow body Generally speaking, the production requirements received by the purchaser often have a SOP. Pack After repeated confirmation with the engineer, the answer I got was that SOP ,so , procurement to understand what is medium body, narrow Size and width are very important.
【Note】Narrow body , width 3.9mm; mid-body , width 5.2mm; wide body , width 7.2mm
Why is there a narrow body and a wide body?
1) Two production standards
a. JEDEC (Joint Electron Device Engineering Council): JEDEC customarily uses SoIC (3.9mm and 7.5mm body widths). b. EIAJ (Japan Electronic Industries Association): EIAJ customarily uses SOP (5.3mm body widths);
b. EIAJ (Electronic Industries Association of Japan): EIAJ customary use of SOP (5.3mm body width);
(2) Mostly 74 series digital logic chips;
3) A few appear in other brands. Such as TI. LM2904, TI can provide both packages: SOIC-8 (D) —JEDEC MS-012 variation AA , 0.150 “=3.8mm Wide SO-8 (PS) —5.3mm Wide
4) Solve the ambiguous marking way to mark the size clearly. SOIC-16(3.9*9.9), SOIC-16(7.5*10.3), SOP-16(5.3*10.2);
Solution
The solution to the fuzzy marking is to mark the size clearly: SOIC-16(3.9*9.9), SOIC-16(7.5*10.3), SOP-16(5.3*10.2); in this way, the upstream and downstream supply and demand sides can clearly see the size of the demand.
5. Sold out after the sample
A BOM list with 20-50 models took the purchasing staff a week to complete. Down , which takes a lot of time and energy , coordinate with suppliers to provide sample support , and then after a long experiment, After the product was put into production and market feedback was received, it was not until the mass production stage that it was discovered that some components in the BOM list could not be purchased in bulk At this time, the purchaser , I have encountered the biggest problem in history .
Solution
This generally happens, often because the assessment of the component procurement market is neglected during the selection and sampling phase. Some components become cold material due to discontinued production, embargo, non-selling, etc., leading to difficulties in subsequent procurement. When using the DFM tool, the procurement team usually conducts a market assessment of the selected components and reminds the customer during the procurement process whether the components are cold materials, so as to propose alternatives in advance in order to avoid problems during the procurement process.
6. Place an order but the stock is not available.
Often happen to place an order, was told that the spot is out of stock this situation, which is the most common procurement of people encountered and most hate the typical procurement turnover accident. This means that have to face the accountability of production, suppliers of excuses, the leadership of the order, really no recourse to cry ah.
After the order is out of stock, most of the reasons are due to their own internal procurement process is too long, delaying the procurement of the best time. Especially in the case of out-of-stock or in the case of commonly sold materials, the supplier’s materials will not stay in the warehouse for a long time waiting for your slow arrival. Therefore, the encounter itself is already out of stock materials, procurement should be mobilized all the power to accelerate the procurement process in order to avoid catching up with the field.
The second reason is that the supplier is not selected. Some suppliers do not have the ability to control the spot inventory and resource deployment capacity is weak, such situations where stock is unavailable after an order has been placed can easily lead to unfortunate misunderstandings. Therefore, a reliable supplier is the core competitiveness of procurement to control the source of goods.
