Custom Capacitors

Contents:

Typical Custom designed Capacitors Manufactured by Dearbon
Application Specific Design
High Performance Films
Metalized Monolithic Polymer Film Capacitors
  Type 520P

Custom Design

Various dielectrics used have been paper, paper-polyester, polyester, polycarbonate, polysulfone, polystyrene, polypropylene, TFE fluorocarbon, polyvinylidene fluoride, and others. Capacitors have been produced using the discrete foil and metalized electrode systems. Impregnants employed include mineral oil, wax,Vitamin Q® silicone oil and various so-called solid impregnants.

Capacitor housings include drawn and fabricated metal shells in standard, rectangular, and special shapes, glass and ceramic tubes, cast epoxy housings, molded housings, plastic-film tubes, plastic-film wraps, and epoxy and resin coatings. Where required, special mounting studs and brack- ets have been furnished.

Capacitance tolerances to meet specific application needs are available within the limits of the capacitor construction. Units with matched capacitor sections, multiple sections of different dielectrics, pulse forming networks, capacitor net- works, capacitor standards, or other application specific capacitors, are available to meet your circuit needs.

Special paper and film-type capacitors have been provided with capacitance ratings from 0.0001µF to 2000µF and with voltage ratings from 30 VDC to 30,000 VDC. Capacitors have been supplied to operate over the temperature range of -65°C to +200°C.

The rigid quality control exercised by Dearborn Electronics Inc. on all its standard production is also applied to custom-fabricated capacitors. Where necessary, special testing is done to verify requirements, such as low dielectric absorption, ultra-high insulation resistance, low dissipation factor, stability under temperature cycling or under specified environmental conditions, etc.

If you have need for special capacitor designs utilizing paper or film dielectrics, Dearborn will be glad to make recommendations on how best to meet your application needs.

High Performance Films

Dearborn evaluates new dielectrics as they become avail- able and has been a leader in the introduction of new film capacitor types.

There are some specialty dielectrics available today which offer significant improvement in electrical or physical char- acteristics. They are as follows:

Polyvinylidene Floride (PVDF)
Polyethylene Naphthalate (PEN)
Fluorene Polyester (FPE)

PVDF has a dielectric constant of 10 as compared with a dielectric constant of approximately 3 for other commonly used dielectrics. This higher dielectric constant and accept- able dielectric strength results in a relative energy density almost 2 times that of other dielectric systems. This film has been successfully used in portable medical equipment and spacecraft applications where improved energy density is of paramount importance.

PEN has better high temperature resistance, higher mechanical strength, and improved dimensional and chemi- cal stability when compared to polyethylene terephthalate (PET). As a result it is possible to produce PEN in thicknesses below 1.0µm while retaining good handling characteristics. The use of these sub-micron thicknesses gives PEN a significant advantage where high capacitance density is required at relatively low voltages.

FPE has an operating temperature of up to 300°C and is one of the films that is part of the continuous research of very high temperature films Dearborn participates in.

Features
• High Stability
• High Insulation Resistance
• Low Losses
• Low Dielectric Absorption
• Hermetically Sealed

Major Applications:
Polycarbonate replacement in timing, and integrating circuitry, high frequency coupling, and other applications where severe environments require hermetically sealed cases

PHYSICAL CHARACTERISTICS

ELECTRICAL SPECIFICATIONS

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