Nihon Dempa Kogyo

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Nihon Dempa Kogyo Co., Ltd. or NDK (日本電波工業株式会社 Nihon Dempa Kogyo Kabushiki-gaisha?) (TYO: 6779) is one of the world's largest Quartz Crystal Companies, based in Shibuya, Tokyo, Japan.

Using its synthetic quartz crystals, NDK produces crystal-related products such as crystal devices (e.g. crystal units, crystal oscillators, crystal filters) and ultrasonic transducers for medical use. In recent years, the company has begun to develop frequency synthesizers and low-power wireless modules.

In 2010, a NDK facility was heavily damaged by an autoclave explosion, killing one person and injuring two others.



  • Crystal Units
  • Crystal Oscillators
    • SPXO
    • TCXO
    • VCXO
    • OCXO
  • Crystal Filters
  • Surface Acoustic Wave (SAW) Devices
  • Optical Components
  • Synthetic Quartz Crystals
  • Ultrasonic Transducers
  • Frequency Synthesizers

Location Summary[edit]

NDK has sales offices in Japan, China, France, Germany, Italy, Malaysia, Singapore, United Kingdom, and United States. NDK has production and engineering facilities in Japan, China, Germany, Malaysia, and the United States.

NDK's Belvidere, IL facility was heavily damaged in a 2009 explosion that destroyed one building, killed a man at a nearby gas station, and injured two others in a nearby office building. The explosion was in a crystal-growth autoclave that had undergone stress corrosion cracking and was inadequately inspected; recommendations from a previous incident were ignored.[1] Demolition of the facility began in March 2015.[2]

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