UW55A type
UW55 type
UW65 type
UW70 type

Variable Vacuum CapacitorsUW series, up to 94 Arms (13.56 MHz)

Small power supply-compliant , compact design, and low loss

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Product Features

The UW series is a compact size model developed for RF applications of the power output 5 kW class or less. It is a long life type using the screws with the longer product life - about 2 times of that of our VM type.
- We realized the low loss and high strength by using copper plated stainless steel.
- Our original high precision spiral electrodes are in use.
- Product line-ups that can cover a wider capacitance: from a minimum of 3 pF to a maximum of 2,000 pF.
- We realized low loss by adopting a high alumina ceramic (UWA55 type)
- We realized a long life by diamond like carbon (DLC) coating
Please refer to the catalog for any caution in handling and operating and explanations of characteristics.

  • Low-loss and high durability bellows
  • Spiral electrodes
  • Wide capacitance range
  • Adoption of a high alumina ceramic
  • Adoption of stronger screw for variable capacitance


Please refer to the PDF (data sheet) attached to each model for the product detail.


Variable vacuum capacitors

Capacitance Min.
Capacitance Max.
(Peak Test)
Max. Current
Type Part
Diameter Data
Min. Max. RF
sort sort sort sort sort sort


We will propose the best options to meet your needs.

Compact size ball screw
A compact size ball screw is adopted as the screw for variable capacitance.
We realized long life to meet the conditions: over-loaded conditions such as high speed and hgh acceleration and deceleration inversion matching, continuous operation in the same range, and slight hunting.
Regarding the shaft shape of the UW series, we can meet the customer's specifications. Please refer to the catalog for details.

Small current type (UW-NP type)

  • Solar power application
  • Maximum allowable current: 50 Arms
  • Allowable surface temperature: 80℃
  • No silver plating
    (Refer to *2 in the specification table for the models compatible with the UW-NP type.)
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