Stock held by vendors:

Actel
AEM, Inc.
Aeroflex Colorado Springs Standard Parts Inventory

Avago
Atmel

BAE Systems
Data Devices Corporation Products
International Rectifier Corporation, Hi-Rel Products

Intersil Corporation, Space and Defense
Linear Technology Corporation

link to Microsemi Corporation
Micropac Industries, Inc.

link to National Semiconductor Corporation Products
link to Texas Instruments inventory and contact TI
Xilinx, Inc.

Distributors
Arrow
Avnet

Other Space Stock Links: 
Technologica (European Distributor)
Air Force Stock  - JANS Semiconductor and Class S 38510 Product

Defense Supply Center Columbus - Master List of QPL/QML Website

Disclaimer: Reference to any specified product, process or service by trade name, trademark, manufacturer, or otherwise, does not constitute or imply its endorsement by the United States government or NASA. It is provided to give designers and engineers rapid access to a wide variety of electronic parts information. The information is voluntarily provided by the part manufacturers. Inventories are subject to prior sales; ask Points of Contact of pertinent company for actual availability and pricing.