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Transcript
TABLE 5.2.4.2-2:
Military
Specification
Type
SELECTION AND USAGE GUIDE FOR CAPACITORS (Cont'd)
Style
Usage Notes
Failure Modes
MIL-C-39022
Metallized dielectric,
dc (hermetically
sealed in metal
cases), ESTABLISHED
RELIABILITY
CHR09
CHR19
Intended for use in applications where the
ac voltage component is small compared to
the dc voltage rating and where occasional
periods of low insulation resistance and
momentary breakdown can be tolerated. If
ac component is present, the sum of the
applied dc and the peak ac voltage shall
not exceed the rated dc voltage, and the
ac voltage shall not exceed 20% of the dc
voltage rating.
Opens occur due to poor internal connections, which under strong electrical or
mechanical stress, will rupture.
Shorts can occur due to internal solder flow
as the result of over-heating the leads during external soldering.
Momentary shorts occur very frequently because the dielectric is so thin, but will
heal themselves, losing a small amount of
capacitance in the process.
MIL-C-55514
Plastic or metallized
plastic dielectric
ESTABLISHED RELIABILITY
CFR02
CFR03
CFR04
CFR05
CFR06
CFR08
Capacitors for use in applications requiring high insulation resistance, low dielectric absoprtion or low loss factor over wide
temperature ranges and where ac is small
with respect to the dc rating. Capacitors
have limited moisture resistance and are
not recommended where heavy transient or
pulse currents are encountered.
Same comments as given for MIL-C-39022.
FIXED, HYBRID, CHIP
MIL-C-55681
Chip Ceramic dielectric
ESTABLISHED RELIABILITY
MIL-C-55365
Chip Tantalum dielectric ESTABLISHED
RELIABILITY
CDROl
CDR02
CDR03
CDR04
CWR02 CWR05
CWR03 CWR06
CWR04 CWR07
CWR08
Intended for use in thin or thick film hybrid circuits.
Decreased insulation resistance and shorts
are the principal failure modes. Causes
are severe delamination, ceramic rupture
and electrode misregistrations.
Intended for use in thin or thick film hybrid circuits for filtering, bypassing,
coupling where the ac is small compared to
the dc rated voltage. To be used only where
protected from moisture.
VARIABLE, CERAMIC
MIL-C-81
Ceramic dielectric
CV11
CV21
CV 31
Capacitors are intended for use where fine
tuning adjustments are periodically required. They are frequently used in RF,
IR, oscillator, phase shifter, and discriminator stages. Capacitance and adjustment
are relatively linear. Capacitance change
with temperature change is nonlinear; also
the temperature sensitivity over the capacitance range is nonlinear. Do not use
these units for temperature compensation.
These are small-size trimmers which are
relatively stable under shock and vibration. Where greater stability is required,
air trimmers should be used.
Same comments as given for MIL-C-11015.