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If you’re in the middle of building or repairing an electronics item and you suddenly realize you’re missing a part, what do you do? The first thing you will probably do is try to find a replacement. This is sometimes a simple matter, but in cases of older electronics or obsolete parts, it isn’t always easy. Whether electronic part numbers begin with D or electronic part numbers begin with 9 makes no difference. When you need the part, you need the part and if you can’t find it, you need a substitution.

There are several types of substitute electronic parts you might come across. Some are exact substitutes, meaning they are functionally identical to the original item but feature a different unit of measure. Exact substitutes like this often come from the same manufacturer. It is also possible you will encounter an upgrade substitute. This is the same item, but in an improved version. If electronic part numbers begin with 8, an upgrade substitute may begin with 8B.

The third type of substitute part could be considered a recommended substitute. This item will be functionally similar to the first and may be from a different manufacturer. Instead of item 8, you would have item 9 that would work just as well.

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