- U.RD International, Inc current sensors
- U.S.Sensor thermistors
- UBR oscillators, resonators, filters, transducers, microphones, speakers, buzzers
- UEC [United China Electronics] speakers
- UEI [Uppermost Electronic Industries Co. Ltd.] thermistors, varistors
- Ultralife Batteries, Inc. batteries
- Ultronix
- acquired by Vishay Intertechnology Inc. - Ulveco Inductors/Transformers
- Now: Amveco
- acquired by Talema - Unibox Enclosures enclosures
- Union Team Limited [UTL] speakers, buzzers, transducers, electret microphones
- Union Technology Corporation [UTC] ceramic capacitors
- United Chemi-Con, Inc. Electrolytic Capacitors
- check Nippon Chemi-Con Corp.
- or Nippon Chemi-Con Europe too! - United China Electronics [UEC] speakers
- United Radiant Technology LCD displays
- United Switch connectors
- Uniter Technology LCD displays
- Univ Power Corp. power supplies, switching power adapter
- Universal Scientific Industrial Co. Ltd. [USI] Frequency Parts & Thick Film Resistors
- Uppermost Electronic Industries Co. Ltd. [UEI] thermistors, varistors
- US Crystal Corp. quartz crystal & oscillators
- acquired by Electro Dynamics Crystal Corporation [EDC] - USA Speed Tech Inc. connectors
- UTC [Union Technology Corporation] ceramic capacitors
- UTL [Union Team Limited] speakers, buzzers, transducers, electret microphones
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