Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Unfortunately, not all of the chip vendor info shows up during web searches. I usually try "part # + datasheet" then just "part #" with some likely combinations of prefixes and suffixes. I've come across some schematics and datasheets where the text is in a foreign language, and Googles' translate feature can help with that.
part of it is just knowing where to look. For example, since TI bought out Unitrode some years back, that's where I looked for the switching regulator. And knowing that Mot. used a different prefix for their 4000 series parts helped. If none of that works, this board is a good resource.