![]() I tried different combinations of packages (I had two choices), and after some google sleuthing, I narrowed it down to 3 parts. I have also found extremely vague parts on google just by the package and the SMD number. This allows you to pull up a datasheet and check. The more certainty you have of the package type (or narrowed it down to a few packages) and you think you know what the part does, you can use a distributor search (such as Digikey, Mouser, or Octopart) to narrow down what the part is. Many manufacturers have also SMD code lists. If it is an old part, a search through old datasheets or maybe an email to the manufacturer might be the way to clarify the part. Then start checking datasheets as most of the leading manufactures provide SMT codes in datasheets with the package information. For example: if I thought the part was an opamp with 5 pins and I knew the manufacturer was TI, I would go to TI's website and run a parametric search that looks for all of the opamps with 5 pin packages. Use parametric searches at the manufacturer's website and package information to narrow down the number of parts. Use what you know about the part.Ī manufacture logo or mark on the package can be really helpfull to identify the package. Step still can't find it 3) So what do you do at this point if you can't find what your part is? There are still lots of options. You can find many IC manufacturer logo's using this link or the picture below: Here are some sources where you can find them: If you're unsure, you will need to search for both. That means if you have A32B it could be mistaken for A328. If you are unsure of character differences, make sure these are noted. These markings include: Manufacturer Logo and\or SMT code. Step 2) Identify all markings on the top of the component. ![]() Here are some resources to help you find different packages or use this below: Package dimensions can also be found at manufactures websites in datasheets (or sometimes in files separate from datasheets, it might take some hunting around to find them) Package dimensions are standardized IPC-7351 or they can also be found by searching for the package type on google and comparing dimensions. Make sure the measurement is precise, or measure across multiple pins and divide by the number of pins to get the pin pitch. Make sure that when measuring pin pitches (distance between pins) that this is done accurately, it can be difficult to tell (for example) the difference between a 1mm pitch to a 1.25mm pitch. ![]() Also get the dimensions of the part with a ruler or (preferably) calipers and match them up with a chart, write them down for a later step. ![]() Note that sometimes the package pins are underneath the part or extended away from the part. Step 1) Identify the package, note how many pins, match up the pins first. ![]()
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