X SERIES POLYSTYRENE AND FOIL
CAPACITORS
ENGINEERING DATA SHEET and ENVIRONMENTAL DATA
APPLICATIONS
Series X
Polystyrene capacitors have superior electrical properties. They are
dry-section, non-polar, non-inductive wound capacitors with low Dissipation
Factor, low Dielectric Absorption, high Insulation Resistance and a low
Temperature Coefficient.
Series X
Capacitors come in several styles: Oval Wrap & Fill; Round Wrap & Fill
(C Style); Axial Epoxy Case (E Style); Radial Epoxy Case (2E Style); Rectangular
Hermetically Sealed (G Style); Round Hermetically Sealed (L Style). They are
available in several sizes including Regular 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 (SQ
Style) are also available for filter applications to specific requirements.
OPERATING
Range: -55°C
to +85°C, with voltage derating, 100% of the listed voltage rating from
-55°C to +65°C, derate linearly to 60% of the listed voltage rating at
+85°C.
LIFE TEST
Series X
capacitors shall be capable of withstanding a test of 250 hours at +85°C and
140% of the DC voltage or a test of 250 hours at +125°C and 140% of the 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-19978, except as noted herein. Not
more than one failure in twelve shall be permitted. Any one of the following
shall be considered a failure.
a.
A change in capacitance of more than 6% from it's initial value.
b.
An increase in Dissipation Factor to a value greater than the
initial acceptance limit.
c.
A decrease in Insulation Resistance to a value less than 60% of
the acceptance limit for +25°C.
d.
A permanent short or open
VIBRATION
Series X
capacitors shall be capable of withstanding a vibration test in accordance with
MIL-STD-202, Method 201. The following details and exceptions shall
apply:
a.
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.
b.
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.
c.
Examination After Vibration. Capacitors shall be visibly
examined for evidence of mechanical damage.
MOISTURE
RESISTANCE
Series X
capacitor Styles G and L (Hermetically Sealed in metal containers) as well as
Metal Can Styles B and C shall be capable of withstanding the moisture
resistance, humidity, and temperature and immersion cycling or MIL-C-19978.
Styles E and 2E (Epoxy Case), Styles Oval and C (Wrap & Fill) and Q
(Feed-Through) capacitors are not intended for exposure to high humidity
conditions over extended periods of time.
TERMINAL
STRENGTH
Series X
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:
a.
Pull Test. The capacitor shall withstand a steady pull
of 5 pounds axially to the leads for 1 minute.
b.
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.
Polystyrene and Foil Capacitor Graphs and Acceptance Criteria
Polystyrene and Foil Capacitors Size Index
Electron
Products Inc.
5367
Phone:
(626) 960-2299 Fax: (626) 814-4434
http://www.ElectronProductsInc.com
Updated: February 24, 2009
Electron URL: http://www.ElectronProductsInc.Com
E-mail: Sales@ElectronProductsInc.Com
Copyright © 2009 Electron
Products Inc. All rights reserved.