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SPECIFICATION
CONSTRUCTION: Metallized
Polycarbonate capacitors are available only in
extended foil (non-inductive) construction.
PACKAGING: Polyester
tape wrap with epoxy endfills gives the best possible
volume density for this type unit.
LEADS: Copperweld (steel,
coated with 30% copper by weight and tinplated
with 60-40 Sn-Pb) is standard and may be soldered
or welded in circuit assembly.
TEMPERATURE RANGE:
May be operated at rated DC voltage from -55°C
to 125°C without derating voltage.
ELECTRICAL [Non-Destructive]
TESTS:
- Capacitance shall be measured at or referred
to 1000 ± 20 Hz at 25 ± 5°C for capacitance
values up to and including 1.0 uf. Capacitance
values greater than 1.0 MFD shall be measured
at 60 ± 6 Hz.
Ref: MIL-STD-202E, Method 305.
- Dissipation factor shall be measured as described
for capacitance and shall not exceed 0.3% to
1 MFD, 0.5% greater than 1 MFD. Typical values
throughout the temperature range, are given
on curves.
- Insulation resistance shall be measured as
follows:
50 - 100V at 25°C 25,000
MEG/MFD, need not exceed 50,000 Megohms.
200V + at 25°C 50,000
MEG/MFD, need not exceed 100,000 Megohms.
Ref: MIL-STD-202E, Method 302.
- Dielectric Strength: Capacitors shall withstand
specified DC test potential for 1 minute through
a limiting resistance of 1 Ohm/Volt.
Terminal to Terminal -150% of DC Rating.
Terminal to Case - 200% of DC Rating.
Ref: MIL-STD-202E, Method 301.
- Dielectric Absorption: Shall not exceed 0.2%
when tested to MIL-C-19978D.
Ref: MIL-C-19978D, Paragraph 3.22.
ENVIRONMENTAL TESTS:
- Vibration: Capacitors will
meet or exceed the requirements of MIL-STD-202E,
Method 204.
- Moisture Resistance: Capacitors
will meet or exceed the requirements of MIL-STD-202E,
Method 103B, condition B, with 500 VDC or rated
voltage applied, whichever is less.
- Life Test: Will withstand
140% of the Rated DC Voltage at 125°C for 250
hours with not more than 1 failure in 12 units.
- Lead Pull Test: The leads
on these capacitors shall withstand a steadily
applied axial pull of 5 lbs. for one minute.
CUSTOM DESIGN
Available on short notice
special shapes, values, characteristics, combination
sections and networks. Non-matallic cases or fabricated
steel and brass with glass-to-metal seals. Engineering
service is expert and prompt.
APPLICATIONS
Metallized polycarbonate capacitors,
in Style "A1" cylindrical wrap and fill
cases offer the user the best possible volume
density for cord wood type assemblies. These units
have consistently met the environmental requirements
of MIL-C-55514A and moisture resistance per M
I L-STD-202E, Method 103B.
Metallized polycarbonate capacitors
combine the reliability of self-healing action
with high dielectric strength and insulation resistance
of polycarbonate film.
Metallized polycarbonate capacitors
are designed primarily for DC application -- blocking,
coupling, decoupling, bypass, DC line filtering
where RF and audio components are small in comparison
to DC rating. However, they have been used successfully
in such AC power applications as power factor
correction and AC line filtering.
Metallized polycarbonate capacitors
operate at all temperatures from -55°C to + 125°C
and are intended for utilization in sealed or
encapsulated assemblies.
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