Component Search Engines
FindChips Searches Newark, Digikey, Mouser, Farnell, Future, Allied, TTI, Arrow, Avnet, Element 14, RS Components, + others
Octopart Searches Newark, Digikey, Mouser, Farnell, Future, Allied, Avnet, Element 14, RS Components, Jameco, Nu Horizons, + others
http://www.embeddeddeveloper.com/ Searches parametric data on various microcontroller manufacturers.
Power Electronics Search Searches power electronics sites content and refines results for: Datasheets, Application Notes, Reference Designs, Magazines, Research Papers, Discussions and many more.
ICReplacements.com Online and free search for integrated circuits, transistors, diodes, MOSFETs and other semiconductors replacements, equivalents and substitutes database.
Oemscart Oemscart is an optimized search engine for electronic components. Search, Compare and buy electronic components based on the price quotes, Datasheets, Product Change Notification (PCN, PDN and EOL) and RoHS of the components with the available inventory along with the lead time across the authorized distributors worldwide