# How to identify old microcontrollers?

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?

• 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. – Nick Alexeev Jun 14 '15 at 22:44
• Google is your friend... – Laszlo Valko Jun 14 '15 at 22:47
• @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 – Brian Drummond Jun 14 '15 at 22:51
• 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? – JabberwockyDecompiler Jun 14 '15 at 22:58
• 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...) – Peter Bennett Jun 15 '15 at 0:07