- R.F. Power Components, Inc.couplers, divider, terminations, resistors
- R.G.D. [Nanjing Rong Guang Da Electronics] plastic-film capacitors
- Radiall Connectors
- Radiohm Potentiometers & Switches
- Rafi GmbH & Co. KG switches
- Rakon Limited Quartz Crystal & Oscillators
- Ralec Electronics Corp. resistors
- Raltron Quartz Crystal & Oscillators
- Ranoda connectors
- Rapid Conn Inc connectors, cables
- RARA ELECTRONICS CORPORATION resistors
- Raychem Circuit Protection surge protectors
- a unit of Tyco Electronics - Rayovac Corp. batteries
- RCD Components Inc. resistors, capacitors, coils, delay lines
- RCL Shallcross
- acquired by IRC International Resistive Company, Inc. - RDI connectors, switches, buzzers, speakers
- Reed Relays and Electronics India Limited reed switches, reed sensors
- Read-Rite Corporation [RDRT] magnetic recording heads
- RECOM Electronic GmbH DC/DC converters
- Redpoint Thermalloy Ltd. Heatsinks
- Regal Electronics connectors, speakers, power supplies
- Releco S.A. Relays
- Reliable Capacitors High-End Capacitors for audio & video
- Relpol S.A. relays
- Remtech
- acquired by Sumida - Renata SA Lithium, Silver-Oxid & Zinc-Air Batteries
- Renco Electronics transformers, coils, inductors
- Reson DIP switches
- Retconn connectors
- RF Monolithics Inc. [RFM] RF transceivers, RF transmitters, RF receivers, SAW filters, SAW resonators and oscillators.
- RFI Corporation transformers, capacitors, modulators
- RFTechniques power resistors, terminations, attentuators
- Rhombus Industries transformers, filters, delay lines
- Rhopoint Components Ltd. Thin-film resistors
- Ria electronic Inc. connectors
- Ricco Electronics jacks & sockets
- Richco Inc. plastic fasteners
- Richey Capacitor Inc. capacitors
- Richmeg Industry Co. Ltd. solenoids
- Riedon resistors
- Rigel batteries
- Ringford Products buzzers, electret microphones
- Ritek OLED
- check RiTdisplay Corporation too! - Rittal enclosures
- RIFA
- now Evox Rifa
- check Evox Rifa North America too! - River Eletec Corp. quartz, resistors, inductors
- Rltech AC/DC, DC/DC power supplies
- RMS Technologies step motors, drivers & controllers
- Robert G. Allen [RGA] resistors, inductors, capacitors
- Robinson Nugent Connectors
- acquired by 3M - Rodale buzzers, transducers, relays, fans, transformers
- Rodan displays
- Roederstein Vishay Resistors & Capacitors
- Roederstein electrolytic capacitors
- now BC Components
- acquired by Vishay Intertechnology Inc. - ROHM resistors
- check ROHM UK
- or ROHM Electronics Division US
- or ROHM [Japan] too! - Romer GmbH Banana plug
- Rong Feng Industrial Co. Ltd. switches
- Rose+Bopla Enclosures
- check Bopla too! - Rosenberger Connectors
- Royal Ohm [ROYAL ELECTRONIC FTY] resistors
- Rubycon Corp. Electrolytic Capacitors
- Ruey Shen Electronics DIP switches
- Ruf Electronics GmbH potentiometers, sensors
- RXD Technologies, L.L.C. crystals, filters, oscillators, resonators
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