TWX, TWXF
Vishay Draloric
www.vishay.com
Watercooled RF Power Pot Capacitors
External Cooling System
FEATURES
• High voltage, current, and power ratings
• Compact design reduces terminal self inductance and
permit operation up to higher frequencies
• These pot capacitors feature increased density through
watercooling and rugged mechanical construction for a
maximum reliability
APPLICATIONS
Watercooled RF power pot capacitors are designed for use
in the tank cicuit of high power RF equipment such as
induction heating and welding equipment, dielectric heating
or a variety of specialized RF applications.
QUICK REFERENCE DATA
DESCRIPTION
Ceramic Class
Ceramic Dielectric
Type
VALUE
1
R7, R16, R42, R85
TWXF
TWX
Voltage (Vp)
12 000 14 000 16 000 20 000 25 000 10 000 12 000 14 000 16 000 18 000 20 000 22 500 25 000
Min. Capacitance (pF)
Max. Capacitance (pF) 5000
Mounting
5000
100
5000
4000
4000
3000
3000
2500 10 000 5000
2500 10 000 5000 10 000 10 000 10 000 7600
Screw terminal
100
4000
7600
3000
7500
7500
2500
5000
PRODUCT DESCRIPTION
CERAMIC DIELECTRICS
• R7 (TCC + 100 ppm/K)
• R16 (TCC + 100 ppm/K)
• R42 (TCC - 250 ppm/K)
• R85 (TCC - 750 ppm/K)
TWX and TWXF pot-styled capacitors dissipate the heat
produced under load by means of water flow around the
capacitor elements. In order to provide protection from
influences of the chemical/physical characteristics of the
coolant, a glass passivation layer is applied over the cooled
noble metal electrode. The ceramic capacitor element is
housed in a rugged silver-plated copper case.
RATED VOLTAGE
• 10 kVp
The electrical terminations are made directly to the noble
metal electrodes utilizing special soldering techniques. This
method of attachment provides a strong, rigid connection of
unsurpassed reliability. The TWX model is made with
a contoured, glazed insulation rim designed for use in
a relative clean, dry environment. The TWXF types feature
an umbrella shaped coating rim made from silicone elstomer
to minimize the adverse effects of moisture, dust and other
impurities in the working environment, and to improve the
characteristics of the electrical field.
• 12 kVp
• 14 kVp
• 16 kVp
• 18 kVp
• 20 kVp
• 22.5 kVp
• 25 kVp
DIELECTRIC STRENGTH TEST
200 ꢀ of rated AC voltage, 50 Hz
MARKING
Type designator, capacitance value and tolerance, rated RF
voltage, ceramic material code, production date code,
manufacturer logo, serial number.
RF POWER TEST
125 ꢀ to 140 ꢀ of rated power, for 10 minutes in a test
generator circuit
ACCESSORIES ADDED
DISSIPATION FACTOR
All watercooled pot capacitors are supplied with
the necessary screws/nuts and contact plates to make the
connection to the electrode terminals. Ferrules and sleeve
nuts for the water supply connections are also included.
R16:
Max. 0.04 ꢀ
Max. 0.05 ꢀ
R7, R42, R85:
Measuring frequencies:
1 MHz (< 1 nF)% 300 kHz or 100 kHz (> 1 nF)
CAPACITANCE RANGE
100 pF to 10 nF
INSULATION RESISTANCE
Min. 10 000 M (at 25 °C)
CAPACITANCE TOLERANCE
20 ꢀ% 10 ꢀ
OPERATING TEMPERATURE RANGE
Details of water cooling find under “Guidelines”, next pages
Revision: 29-Jan-13
Document Number: 22131
1
For technical questions, contact: powcap@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000