- U.RD International, Inc current sensors
- U.S.Sensor thermistors
- U-Best Innovative Technology Co., Ltd. PU synthetic resins
• also known as U-Best Polymer Industry CO., Ltd.
• In 2019, the company changed its name to Yongjie Innovation Technology Co., Ltd.
- U-Best Polymer Industry CO., Ltd. PU synthetic resins
• also known as U-Best Innovative Technology Co., Ltd.
• In 2019, the company changed its name to Yongjie Innovation Technology Co., Ltd.
- UDE Corp connectors
- 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
- UMT [Universal Microwave Technology Inc.] microwave / mm-wave devices and antennas
- Unibox Enclosures enclosures
- Unictron Technologies Corporation [UTC] chip antennas and piezoelectric ceramics
- Unimicron Technology Corporation PCBs
- Union Team Limited [UTL] speakers, buzzers, transducers, electret microphones
- Union Technology Corp. (UTC) [Quantic UTC] multi-layer ceramic chip capacitors
- Unimax switches
• acquired by C&K
- UNIMAX SAFETY SWITCH safety swiches
• a division of IN2TEC Ltd.
- Unitech Printed Circuit Board Corp. PCBs
- 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
- United Wireless Ltd.
• acquired by Stadium United Wireless Ltd. M2M wireless devices
- Uniter Technology LCD displays
- Univ Power Corp. power supplies, switching power adapter
- Universal Microwave Technology Inc. [UMT] microwave / mm-wave devices and antennas
- Universal Power Group Inc. batteries
- Universal Scientific Industrial Co., Ltd. [USI] Frequency Parts & Thick Film Resistors
- UNO Minda Limited automobile components manufacturer, including sensors, horns & batteries
- 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
- USEFUL SENSORS iNC. AI-enabled sensor modules
- UTC [Unictron Technologies Corporation] chip antennas and piezoelectric ceramics
- UTC (Union Technology Corp.) [Quantic UTC] multi-layer ceramic chip capacitors
- UTL [Union Team Limited] speakers, buzzers, transducers, electret microphones
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