1. Panasonic (Matsushita)
  2. Panasonic Semiconductor Development (PSDC)
  3. Paradigm
  4. Performance Semiconductor
  5. Pericom
  6. Philips
  7. Philsar Electronics
  8. Piezo Crystal Company
  9. Pijnenburg
  10. Pixelworks
  11. PLX Technology
  12. PMC-Sierra
  13. Polyfet RF Devices
  14. Power Innovations
  15. Power Integrations
  16. PowerDsine
  17. Powerex
  18. Powersmart
  19. PowerTech
  20. PrairieComm
  21. Precision Monolithics (PMI) (-> Analog Devices)
  22. Princeton Technology (PTC)
  23. Protek Devices
  24. Qlogic
  25. QSound Labs
  26. QT Optoelectronics
  27. Qualcomm
  28. Quality Semiconductor
  29. Quantum Effect Devices
  30. Quantum Research Group
  31. QuickLogic
  32. RAD Data Communication
  33. Rambus
  34. Ramtron
  35. Rancho Technology
  36. Raytheon (-> Fairchild)
  37. Realtek
  38. Rendition
  39. RF Micro-Devices
  40. RF Monolithics, Inc  
  41. RF Power Components
  42. Ricoh
  43. Rise Technology
  44. Rockwell (-> Conexant)
  45. Rohm Electronics