You must know your part number in order to search Electronet. Also maintains links to distributors' Web sites. IC Master Online Comprehensive source for information on nearly 2 million chips. Search by function, type of device, part number, or manufacturer. Includes references to databook information, application notes, pinout and packaging information.
Access is free, but requires registration for first-time users.
Print version available in Gelman Library, REF TK7874.I32. It has separate, searchable databases for integrated circuits, board level products and system sub-assemblies, and discrete components such as diodes, transistors, etc. There are also databases for computer aided design and engineering tools, manufacturers' application notes, and pertinent Usenet groups. Well-designed site and a good starting point. This database specializes in memory integrated circuits and covers about 100,000 chips from 60 manufacturers.