Vendors: (use your credit card to order from these folks, once you know the part number you want)

Normal vendors:
Mouser Electronics (excellent service, fast delivery, no minimum order, limited selection)
Allied Electronics (excellent service, fast delivery, reasonable selection)
Digikey (good service, fast delivery, reasonable selection)
Newark Electronics (sometimes slow delivery, high shipping charges, enormous selection)

Surplus vendors (good for browsing, or for common items like resistor kits or power supply modules):
All Electronics
Marlin P. Jones. & Associates

Obsolete parts:
America II Electronics
There are lots of others -- usually just Google the part number of what you're after.

Manufacturers (you can't buy from these folks, but good for getting datasheets):

National Semiconductor (wide array of discrete components and integrated circuits)
Motorola (Now Freescale Semiconductor, wide array of discrete components and integrated circuits)
Texas Instruments (now includes Burr Brown, a manufacturer of low-current-noise op amps)
Analog Devices (includes some of the most popular low-noise op amps)
Linear Technology (includes some nice high-current op amps)
Apex Microtechnology (high voltage op amps)
Maxim (keen digital stuff, telecommunications, ultrafast op amps)

 

This page maintained by Walter F. Smith. Last update: 12-8-08.