I have several old microcontrollers, I am sure I bought them over 10 years ago. It is my assumption that the numbers on these would still be categorized, but I cannot find a way to search the internet by the number to find out what I can use these microcontrollers are for. When I do a search for the number I generally either find a data sheet about a similar number or nothing at all. I have 14 so I won't list all the numbers here, but here are a few examples.

  • GAL16V8D 15LP C914D16
  • 74LS 138 661
  • T74LS74B1 98640A

Is there a site that I can enter these numbers in to find out what the purpose of these microcontrollers can do?

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    \$\begingroup\$ I have to report that I've had no trouble finding datasheets on the web for GAL16V8 74LS138 74LS74. By the way, neither of these is a microcontroller. They are all logic. GAL is programmable logic. \$\endgroup\$ – Nick Alexeev Jun 14 '15 at 22:44
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    \$\begingroup\$ Google is your friend... \$\endgroup\$ – Laszlo Valko Jun 14 '15 at 22:47
  • \$\begingroup\$ @Nick - You, like me, have had years of practice knowing where to chop the strings and find familiar numbers. Given those numbers, the questioner will have no problem either \$\endgroup\$ – Brian Drummond Jun 14 '15 at 22:51
  • \$\begingroup\$ It sounds like you dropped off the numbers not at the spaces but elsewhere. I.E. GAL16V8 I found as well, I assumed it was a different model than GAL16V8D. Is that not the case? \$\endgroup\$ – JabberwockyDecompiler Jun 14 '15 at 22:58
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    \$\begingroup\$ Suffix letters on IC part numbers often indicate the package or temperature grades. Letter prefixes usually indicate the manufacturer or original manufacturer (often in non-obvious ways). However, the "GAL" prefix indicates the general type of the device. "74LS" is a clear indication that the part is a TTL logic device. (But all such knowledge only comes with experience...) \$\endgroup\$ – Peter Bennett Jun 15 '15 at 0:07

None of these are microcontrollers, they're all logic (programmable logic in the case of the GAL, fixed in the other two). Goto sites like Digikey & Mouser to enter full or partial part numbers - if there's ambiguity that a partial part number happens to match two entirely different types of components, it should be pretty clear which it is (usually).

For more generic googling, try just the first several alphanumeric characters of the part number (e.g. GAL16V8, 74LS138, 74LS74), the later characters are not usually helpful to a "just curious" search, and sometimes you need to remove the first one or two characters, but knowing when to do that is an 'acquired skill' :)

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