A KYOCERA GROUP COMPANY
AVX
EMI Filters
Introduction
HIGH-REL EMI FILTERS
Noise is the enemy of good engineering design. Properly
installed EMI filters suppress such electromagnetic interfer-
ence on power and signal lines, while allowing desired sig-
nals to pass. For critical EMI filter applications, high reliability
is of the utmost importance.
High reliability applications have diverse requirements, rang-
ing from a need for a long operating life in medical or military
systems to avoiding the prohibitive cost of replacing a faulty
component in a satellite, undersea cable, or other inaccessi-
ble system. High-rel filters satisfy application-critical require-
ments in many environments:
• Space/Satellite Systems
• Military Aircraft
• Guidance Systems
• Command, Control & Communications (C
3
)
• Missile Systems
• Weapon Systems
• Radar Systems
• Electro Optical Systems
• Electronic Countermeasures
• Electronic Warfare
• Pacemakers
• Medication Monitors
• Facility qualified to MIL-STD-790 during first round of
audits for filter manufacturers.
• The first solder-in filter line to offer 400°C installation
temperature.
• The first filter line designed to meet the new MIL-Spec
requirements for heat rise/reactive current in 125 VAC
and 230 VAC 400 Hz applications.
• The first to offer a filter line of hermetically sealed bolt
style filters.
CUSTOM AND SEMI-CUSTOM
In addition to standard catalog and QPL EMI filters, AVX
Filters produces two classes of these special products:
Semi-custom and Custom. Semi-custom involves variations
in electrical parameters, testing, and limited mechanical
changes from standard product designs. Delivery is slightly
longer and price is slightly higher than standard products
Custom products require longer lead time for design and
manufacturing, but give designers freedom to specify non-
standard mechanical and electrical filter designs.
AVX Filters dedicates a unique internal part number to every
semi-custom and custom component. This insures contin-
ued configuration control for each part, allows future
changes to be easily implemented, and provides assurance
that the design always matches the customer requirements.
HIGH-REL STANDARDS
Reliability must be designed into an EMI filter. Every step in
its manufacture from material selection through testing and
characterization must be considered. To assure confor-
mance to clearly-defined product and performance parame-
ters, specifications have evolved for electrical performance,
mechanical configurations, test methods, screening and
qualification procedures.
AVX Filters delivers high quality EMI filters which meet appli-
cable portions of these high-reliability standards:
• MIL-F-15733
• MIL-STD-220
• MIL-F-28861
• MIL-Q-9858
• MIL-STD-202 • MIL-I-45208A
• MIL-STD-790 • ISO 9000
• MIL-C-123
• EIA-RS-469
ENGINEER TO ENGINEER
Our application engineering staff will assist in defining
your filter requirements, while recommending advantages,
reliability, quality assurance levels, and filter performance at
the lowest practical cost. They will help in filter selection and
specification, including meeting DESC requirements. SCD
models are available to assist you in the design process.
A custom filter part number will be assigned exclusively to
your SCD. To obtain prompt, professional assistance, call
(818) 767-6770.
QUALITY ASSURANCE
Quality assurance is built into every stage of manufacturing
and testing. AVX Filters controls the entire process, from
the capacitor's dielectric formulation through final filter
test. This results in absolute traceability by lot number to a
specific dielectric batch, as well as the subsequent materials,
equipment and employees involved in the tightly-controlled
manufacturing and testing process. In addition, critical
processes are monitored using SQC, SPC techniques.
AVX FILTERS AT THE LEADING EDGE
AVX Filters Corporation continues to provide innovative
solutions to the high performance needs of its customers. It
has pioneered many breakthroughs which have advanced
the state-of-the-art in this demanding discipline, including:
• The first to qualify to the new High-Reliability Filter Spec,
MIL-F-28861.
AVX Filters Corporation
Contents
Filter Product Selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Filter Design Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Solder-In Style. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Bolt Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Cylindrical Style . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Military Qualified Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Advanced Technology Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Filter Plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
How To Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
1
Filter Product Selector
Application Notes
Hermetically sealed on one end. This
solder-in series provides both C & L cir-
cuit configurations with effective filtering
in the microwave frequency spectrum
from 10 MHz to 26 GHz and beyond.
Unique construction provides 300°C
installation protection against internal
solder reflow. Ideal for assembly into
filter arrays.
Most commonly used bolt-style filter pro-
vides improved filtering in the HF through
microwave frequency spectrum from 1
MHz – 10 GHz.
Highest cap values available in small size
– 1.4 MFD. Lowest profile configuration
in cylindrical style best suited for low
moisture environments where hermetic
seal is not required. Provides effective
filtering from 500 KHz to 10 GHz.
This hermetically sealed filter series
provides the longest cases and most
space available in a .375/.410 diameter
cylindrical style. It also offers the greatest
number of circuit options.
The MIL-F-28861/2, 3, 4, 5 are the QPL
equivalents of this series. This series
offers effective filtering from 30 KHz to 10
GHz.
This series of custom assemblies utilizes
AVX Filters' line of high temperature sol-
der-in filters capable of 300°C installation
temperature and can be designed and
fabricated to your specified requirements
or spec control drawings. They can be
furnished 100% tested and burned-in
prior to shipment. To satisfy your require-
ments for military QPL product and to
preclude the need for non-standard parts
approval, these filter arrays may be
supplied with MIL-F-28861/12,/14 or /15
filters installed as available (see QPL
Listings). If no QPL sources available, the
arrays could be supplied with filters
approved to DESC drawings 88010,
84080, 84081, or 84082, respectively, or
to the AVX Filters catalog equivalents
designed to the requirements of the
MIL-F-28861 slash sheets.
2
Filter Design Guide
High Reliability
INSTALLATION, HANDLING, HARDWARE OPTIONS
GENERAL
Proper Electrical Operation Requires:
• Good filter/case ground.
• Design layout where filter is installed directly into
conductive shield or enclosure.
• Minimizing holes, slots, or other penetrations of the
shield near the filter.
• Do not cut or form filter leads.
— Mechanical stress may be transmitted to the
discoidal capacitor.
— The glass hermetic seal may be damaged.
— Contact AVX Filters regarding custom lead lengths
to accommodate your requirements.
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.
• On epoxy sealed bolt-style units AVX Filters recom-
mends conformal coating of the units after installation to
improve moisture resistance.
• Observe same precautions listed for hi-temp filter when
soldering to filter center pin.
• Do not bend filter center pin.
Installation Precautions
• Although EMI/RFI filters can withstand temperature
extremes, rapid heat-up or cool-down can crack the
internal ceramic capacitor.
– Pre-heating of the filter prior to soldering should be
performed whenever possible.
– Forced-air cooling after soldering is not recommended.
Avoid Mechanical Stress
• Do not use pliers or other gripping tools capable of
exerting excessive pressure on filter case.
• Do not alter the lead or terminal flag either before or
after soldering.
Cylindrical-Style Filters
• 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.
— JD series (5/16-24 UNF-2A) require 60 ± 4 oz-in.
• The terminal flags should not be subjected to mechanical
stress during or after leadwire installation. The glass
hermetic seal may be adversely affected.
• 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.
SPECIFIC RECOMMENDATIONS
Hi-Temp Solder-In Style Filter
• Small case design sensitive to excessive heating.
• 150°C preheat prior to solder installation using supplied
solder preform highly recommended.
• 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.
• When soldering leads using an iron:
— Iron tip temperature should not exceed 460°F (60/40
solder recommended).
— Use a small iron, 15-20 watts, and do not apply heat
for longer than 10 seconds.
— 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.
HARDWARE OPTIONS
General
• Necessary mounting hardware is supplied with all filters.
• Hex nut and lockwasher plating will be as per filter case
specified.
• 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.
3
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