Type CP53 MIL Spec Capacitors

TYPE CP53, CP54, and CP55 capacitors are manufactured to meet or exceed the requirements of MIL-C-25/4D. Chicago Condenser Corporation’s CP53, CP54, and CP55 capacitors are manufactured using the highest quality Kraft paper impregnated and filled with a premium dielectric fluid. The capacitors employ windings housed in a hermetically sealed drawn metal case with non-removable solder lug terminals insulated with silicone rubber bushings. For applications which do not require MIL Spec certification, improved capacitor performance can be obtained by substituting more modern winding materials (polyester, polypropylene, etc.) for paper.

type-cp53-54-55-capacitorCase: Tinned metal with terminals
Terminals: Silicone rubber bushings with non-removable solder lugs
Voltage: 100 VDC to 1000 VDC
Capacitance: 0.1 uF to 4 uF, ±10 or +20%,-10% standard. Other tolerance on request.
Temperature: -55 °C to +85 °C

• Rectifier Filters                 • Spark Suppression
• Integrating Capacitors   • Tuned Filters
• Audio Coupling                 • Audio Bypass

GENERAL: CP53, CP54, and CP55 capacitors are built to a venerable MIL Spec which requires the use of very old technology (paper windings). For this reason, these capacitors are not recommended for commercial applications, where more modern winding materials, such as polyester and polypropylene, either metalized or wound with foil, will provide improved capacitor characteristics, greater reliability, and usually at lower cost. Chicago Condenser Corporation maintains an expert engineering staff which is ready to work with you in order to develop a custom capacitor around your requirements. Chicago Condenser Corporation’s free design service can optimize the many factors which affect performance to provide a capacitor which best meets your needs.

SIZE: The case sizes listed below are those required by MIL-C-25/4D for CP53, CP54, and CP55 capacitors. The case sizes are not necessarily the smallest possible for a given capacitor, if MIL Spec certification is not required. For non-MIL Spec applications, the use of more modern winding materials than paper can affect substantial reductions in capacitor size and improvements in capacitor properties. If size and shape are critical to your application, Chicago Condenser Corporation will be pleased to work with you to optimize a capacitor to your needs. A wide range of can sizes in several styles is available. If the revised design employs a stock can, no cost penalty should be incurred. If a custom can is required, cost depends heavily on quantity.

IMPREGNANT: CP53, CP54, and CP55 capacitors are normally impregnated and filled with dielectric grade mineral oil or a synthetic dielectric fluid.

WINDING DESIGN: Capacitors can be constructed in a range of winding designs (e.g., extended foil, tab constructions, etc.) and can be fabricated from a wide range of dielectric materials including polypropylene, polyester (“Mylar”), polycarbonate, etc. with varying layers and configurations of paper. Each combination of construction and materials has its advantages and disadvantages. For example, an extended foil design gives the greatest current carrying capability and lowest ESR at the expense of a somewhat higher inductance that can be achieved with a tab design. The inductance and ESR in tab designs depends on the number of tabs. Increasing the number of tabs in a winding increases the time required in manufacture, and therefore, the cost to the customer. Mylar is a good general purpose dielectric with a relatively high dielectric constant which results in a smaller capacitor that polypropylene; however, polypropylene has much better high frequency characteristics. The proper use of fluid-impregnated paper layers is important in capacitors which see frequent and wide swings in voltage (AC, pulse discharge, etc.), as it provides a medium with greater tolerance to electron injection in highly stressed regions of the capacitor.

VOLTAGE RANGE 100 V to 1000 V
CAPACITANCE 0.1 uF to 4 uF
TOLERANCE ±10% standard for single winding
+20, -10% standard for multiple winding
DISSIPATION FACTOR < 1% when measured at 25 °C and 1 KHz  for ≤ uF or 60 Hz for > 1 uF
CASE and FINISH Hot-tinned steel with bottom surface soldered
DIELECTRIC Impregnated and filled with premium mineral oil or synthetic (non-PCB) dielectric fluid
TERMINALS Silicone rubber bushings with rivet terminals and non-removable solder lugs
TEST VOLTAGE Terminal-to-Terminal: 200% of rated voltage for 1 minute at 25 °C
Terminal-to-Case: 300% of rated voltage for 1 minute at 25 °C
MOUNTING POSITION All CP53, CP54, and CP55 capacitors will operate satisfactorily mounted in any position

Proceed next page for standard ratings, dimensions and terminal configurations.