Ceramic RF High Voltage capacitors are commonly referred to as doorknob capacitors. These capacitors have many applications in industries such as:
Typical high voltage RF capacitors voltages range from 5KVDC to 20KVDC, the most popular being between 7.5KVDC and 15KVDC. Popular temperature coefficients are NPO (means negative positive 0), N750 (manufactured in clean rooms facilities).
Tolerance of this type of capacitors usually is 10%. The typical mounting styles for these doorknob capacitors are axial lead and threaded terminal 6/32 for 7.5KV and 10/32 for 15KV.
The material used in the manufacturing of high voltage ceramic capacitors is titanate which offers an excellent temperature compensating property (when other components change in the circuit, this allows a constant resonant frequency). These capacitors can withstand high RF voltages without breaking down. Being oval in shape, these RF capacitors minimize inductance while excelling in voltage optimization.
Popular values of doorknob capacitors are:
TEDSS.com is happy to produce this convenient cross reference chart from older numbers by Centralab and Philips, to the current production numbers.
Another capacitor often referred to as a doorknob capacitor is the cast epoxy high voltage capacitor manufactured by Ceramite. These capacitors range from 10,000 volts thru 40,000 volts. Tolerances are either -20%+80% or 20%. These high voltage ceramic transmitting capacitors are typically used in radio transmitters, lasers, and high-power power supplies.
The temperature rating of the doorknob is 85°C standard. They are mounted by terminal adapters typically with 8/32 tapping.
These extremely reliable and rugged capacitors can be found at Tedss.com. They have the best prices around. At Tedss.com you have access to a huge on-the-shelf availability of inventory.