Filter Design Guide
High Reliability
INSTALLATION, HANDLING, HARDWARE OPTIONS
• Do not cut or form filter leads.
GENERAL
— Mechanical stress may be transmitted to the
discoidal capacitor.
Proper Electrical Operation Requires:
• Good filter/case ground.
— The glass hermetic seal may be damaged.
• Design layout where filter is installed directly into
conductive shield or enclosure.
— Contact AVX Filters regarding custom lead lengths
to accommodate your requirements.
• Minimizing holes, slots, or other penetrations of the
shield near the filter.
Bolt-Style Filters
• Do not exceed recommended nut mounting torques
listed on next page. NOTE: it is preferable to keep to the
low side of torque range when installing filters into
threaded mounting holes.
Installation Precautions
• Although EMI/RFI filters can withstand temperature
extremes, rapid heat-up or cool-down can crack the
internal ceramic capacitor.
• On epoxy sealed bolt-style units AVX Filters recom-
mends conformal coating of the units after installation to
improve moisture resistance.
– Pre-heating of the filter prior to soldering should be
performed whenever possible.
– Forced-air cooling after soldering is not recommended.
• Observe same precautions listed for hi-temp filter when
soldering to filter center pin.
Avoid Mechanical Stress
• Do not bend filter center pin.
• Do not use pliers or other gripping tools capable of
exerting excessive pressure on filter case.
Cylindrical-Style Filters
• Do not alter the lead or terminal flag either before or
after soldering.
• Observe recommended nut mounting torque as per the
table on next page.
— BK, CK, GK – series filters (1/4-28 UNF-2A) require
44 4 oz-in.
SPECIFIC RECOMMENDATIONS
— JD series (5/16-24 UNF-2A) require 60 4 oz-in.
Hi-Temp Solder-In Style Filter
• The terminal flags should not be subjected to mechanical
stress during or after leadwire installation. The glass
hermetic seal may be adversely affected.
• Small case design sensitive to excessive heating.
• 150°C preheat prior to solder installation using supplied
solder preform highly recommended.
• Use care in soldering to the terminal flags. An 18-30
watt soldering iron is recommended. CAUTION: the use
of a large wattage iron without temperature control may
cause reflow of the high-temperature solder used to seal
the terminal. This could result in the loss of hermeticity
for the filter.
• Vapor phase reflow (VPR) soldering with integral preheat
is preferred.
• Infrared (IR) and hot plate soldering may also be used.
• Temperature should be increased to solder temperature
(300°C, max.) at a controlled rate of 2°C per second.
• Time at max. temperature should be kept at a minimum
and should never exceed 30 seconds.
HARDWARE OPTIONS
• When soldering leads using an iron:
General
— Iron tip temperature should not exceed 460°F (60/40
solder recommended).
• Necessary mounting hardware is supplied with all filters.
• Hex nut and lockwasher plating will be as per filter case
specified.
— Use a small iron, 15-20 watts, and do not apply heat
for longer than 10 seconds.
• Refer to table for hardware selection. Standard hard-
ware (“STD”) will be supplied unless otherwise requested.
MIL-F-28861 filters will be shipped with MIL-F-28861
hardware.
— Use of heat sink clip when lead length permits is
recommended.
• Do not expose leads to torque stresses by moving wires
after soldering to lead. The glass hermetic seal may be
damaged.
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