- Radiall, Inc.
- Radiometrix Ltd.
- Radionic Hi-Tech, Inc.
- RAF Electronic Hardware
- Raltron
- Ramtron
- Ranoda Electronics
- Raychem Corp.
- Raytheon
- Raytheon Electronics Semiconductor Divison
- RCD Components
- Redpoint Thermalloy Ltd.
- Reeves-Hoffman
- REMEC Microwave Division
- Renaissance Electronics Corp.
- Renco Electronics, Inc.
- Rendition
- Republic Electronics
- RFI Corporation
- RF Micro Devices
- RF Monolithics, Inc.
- RF Prime Corp.
- RF Techniques, Inc.
- RIA Electronic
- Richco
- RO Associates
- Robert G. Allen Co.
- Robinson Nugent
- Robison Electronics, Inc.
- Rochester Electronics
- Rockwell Semiconductor
- Roederstein
- Rohm
- ROSS Technology, Inc.
- RS Microwave
- Rubycon Corp.
