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Power Supply. To start with, I recommend making a list of components and their critical parameters which needs to be checked. There are number of parameters which I always consider while choosing a right component.
Hope this will help you next time when you are working on a project where you need new components to be selected. But before that one important point about parts from previous designs. Using components from previous proven design Image Credit: Pexels 3. The easiest bet would be to use the part you have already used in your previous proven design, this helps reduce the risk of design issues, delays, also no additional part in inventory to manage.
But, this approach has one drawback. If you stick on to an older proven component, you may miss advantage of a new part, which may bring in bene ts like more compact, more integration, more power e cient, better protection, better longevity. New Parts Selection Now, let us assume we have to select a part which we did not use before, so how should we approach this challenge.
Best would be to Image Credit: Pexels 4. Let me discuss some of the parameters one by one, this is based on my personal experience working with many companies on various projects: Manufacturers Select manufacturer wisely.
Always consider a manufacturer who has good product documentation like informative datasheet, application notes, reference designs, evaluation board support, support channel. For complex devices you may want to get in touch the manufacturer over email to test their support. If local Field Application Engineer support is available in your country, would be really helpful.
Trusting manufacturers who do not have good product documentation and support is tricky. Evaluation board can also be used for pre-quali cation. Reference Designs, Software Tools Some manufacturers also provides a lot of other resources like industry-speci c reference design, software tools to help designer evaluate the performance of the component as per your own con gurations before even designing anything.
This heavily reduces the development time and chances of failure. Many manufacturers also provides 1. You can send them your schematics with their part used and they can help you review and tell you if everything is OK or if they have any recommendations. Many companies maintain a list of preferred list of manufactures which gets 1st preference. If say part A has complex application circuit w. But, sometimes that comes with a cost, for example: easy application circuit but at a little extra cost, here comes the trade-o.
Some similar parts might have ESD protection inbuilt, so might cost a little more. Please consider carefully what bene ts you are getting, like compact size, easy design vs. Electrical Parameters [voltage, current , power, accuracy, response time, speed, resolution, etc. Another example is, consider a DC-DC Converter IC, some of the electrical parameters would be input voltage range, output voltage accuracy, inbuilt protections available like over current, over voltage, under voltage cuto , thermal shutdown, light load e ciency, power rating, thermal management, etc.
Make sure you make a list so that you do not miss a critical parameter. Mechanical Parameters [dimension, package, weight, etc. It starts with, what kind of size constraints you have? Are you OK with little bigger size or you need to select a package which is as compact as possible? With smaller package, also comes the complexity of assembling, testing, repairing.
Example: if you are select an SMD resistor, it would very hard to manually solder a package vs. Do you want to go automated PCB assembling route or stick to packages which could be soldered manually? In general, we should keep overall weight of the product low as it directly impacts your shipping cost.
In some cases, weight might be a bigger constraint like for a wearable product or anything which goes on, for example, a drone. Consideration w. Visualize beforehand, how that part is going to be placed on board and then tested. You should know the range of temperate your product will see, then take the worst case analysis and do the selection, likewise for other parameters.
Missing this consideration may lead to eld surprises like eld failures or bad performance. If you have any confusion or information about availability is not available, you can check with the manufacturer. Lead time Lead time plays an important role. This can totally screw up your development roadmap if you missed considering it beforehand.
Sometimes sample lead times are short but when you try to buy bigger quantity, lead times are higher, so be careful. This has an e ect on your overall cost of the product. Cost 8. Everyone wants to have the best component at the most a ordable cost.
Sometimes device cost more due to better performance, more power e cient, smaller package, more integration like optical isolation, ESD protection inbuilt in RS transceivers, etc.
So, consider overall value-add rather than just the cost of a component. If you consider this way you can take a better decision. From where to Buy This is critical.
As mentioned earlier, I always recommend buying components from trusted sources like directly from the manufacturer if possible, authorized distributors, etc.. I do not advice to buy from a shop online or physical where genuinity of a component is not assured. One may nd it attractive to buy from a local vendor as it is Image Credit: Pexels 9. I have experienced this several times in the early days of my career so I always keep this in mind.
This, many a times saves manual patch work, even redesign. In some of my designs, I have used assembly options to make two di erent type of DC-DC converter chip compatible for power supply section as I was unsure about the long-term availability, lead times of the part. This helped me with long-term availability and more exibility as now I had two options.
Assembly options are also useful when you want an option in your board to bypass a section in case it is not required. You may put an optional zero ohm resistor. Design Reviews Follow 3 level review process: 1st - always do a detailed self-review. A 2nd review should be done by someone else than you in your organization. Prototype before you plan production For complex part selection, it is always advisable to test those parts either using the evaluation boards or by making a small board, before including in the full design.
Once the part is tested and performance is evaluated, it can be included in the full product design. Many companies do the full design itself but then they are aware that they are taking the risk and if some problem comes they need to redesign and get it manufactured again.
So, take an informed decision on what is best for you.
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