Series D Metallized Polyester capacitors are superior general purpose capacitors for both AC and DC applications. They are dry-section, non-polar, non-inductive wound capacitors with high volumetric efficiency and a low cost. 

Series D Capacitors come in several styles: Oval Wrap & Fill (DW Style), Round Wrap & Fill (DR Style), both in regular and new Flame Retardant Tape; Axial Epoxy Case (DE Style); Radial Epoxy Case (DF Style); Rectangular Hermetically Sealed (DG Style); Round Hermetically Sealed (DL Style); Round Wrapped Feed-Through (DQ Style). They are available in several sizes including Regular (3 Size code) and Miniature (2 Size code) as well as custom sizes to meet specific customer requirements. 

Contact our Engineering Department for special sizes, configurations, capacitance values and AC applications with Anti-Corona construction at all frequencies. Custom metal enclosures are available. Custom designed Feed Through capacitors (DQ Style) are also available for filter applications to specific requirements.


Range: -55C to +125C, with voltage derating. 


Series D capacitors shall be capable of withstanding a test of 1000 hours at +125C and 100% of the derated DC voltage or a test of 250 hours at +125C and 140% of the derated DC voltage. The voltage shall be applied to each capacitor through its individual current-limiting resistor as determined from the formula R = 0.025/C, where C is the nominal capacitance in farads and R is in ohms.

The test procedures shall be in accordance with MIL-C-18312, except as noted herein. Not more than one failure in twelve shall be permitted. Any one of the following shall be considered a failure.

  1. A change in capacitance of more than 10% from it's initial value.
  2. An increase in Dissipation Factor to a value greater than 125% of the acceptance limit.
  3. A decrease in Insulation Resistance to a value less than 30% of the acceptance limit for +25C.
  4. A permanent short or open


Series D capacitors shall be capable of withstanding a vibration test in accordance with MIL-STD-202, Method 201. The following details and exceptions shall apply: 

  1. Mounting. The capacitor body shall be rigidly mounted by the entire body length to the vibration test fixture. The leads shall be soldered to rigidly supported terminals and so spaced that the length of each lead from the capacitor is 1/2 1/8 inch from the edge of the supporting terminal. 
  2. Measurement during Vibration. During the last cycle in each direction, an electrical measurement shall be made to detect intermittent contacts (not to be confused with "self healing" clearings) or open or short circuiting.
  3. Examination After Vibration. Capacitors shall be visibly examined for evidence of mechanical damage. 


Series D capacitor Styles DG and DL (Hermetically Sealed in metal containers) as well as Metal Can Styles DB and DC shall be capable of withstanding the moisture resistance, humidity, and temperature and immersion cycling or MIL-C-18312. Styles DE and DF (Epoxy Case), Styles DW and DR (Wrap & Fill) and DQ (Feed-Through) capacitors are not intended for exposure to high humidity conditions over extended periods of time. 


Series D capacitors utilize tin-plated, copper-clad steel wire terminals which shall be capable of withstanding the following test without mechanical damage to the capacitor or terminals: 

  1. Pull Test. The capacitor shall withstand a steady pull of 5 pounds axially to the leads for 1 minute.
  2. Bend Test. The wire lead terminals shall be bent at a point of 1/4 inch from the body of the capacitor, first 90 degrees in one direction, then back to the original position, and then 90 degrees in the opposite direction.

Metallized Polyester Graphs

Metallized Polyester Index

American Home Page

Updated: July 30, 1997

Publisher: American Capacitor Corporation
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Copyright © 1997 American Capacitor Corporation. All rights reserved.

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