EMI/EMP Filter Protection Connectors
For protection of sensitive circuits
Amphenol
®
EMI/EMP Protection Connectors offer the versatility
of standard connectors with EMI/EMP protection for sensitive
circuits. Internal housing of the EMI/EMP devices eliminates
costly and bulky exterior discrete protection devices.
Virtually all major MIL-Spec circulars can be
incorporated with filter devices:
• MIL-DTL-38999
• MIL-DTL-5015
• MIL-DTL-26482
• MIL-DTL-27599
• MIL-DTL-83723
• MIL-DTL-26500
Amphenol offers filter connectors that include:
• EMP protection using diodes
• EMP protection utilizing metal oxide varistors (MOV’s)
• Filtered plug connectors
•
Filtered hermetic connectors
• Filter connectors with ESD protection
•
EMI & EMP Protected Connectors
• Combinations of filtering devices within one
connector package
Amphenol
Aerospace
Series III TV
Series II JT Series I LJT
This catalog focuses on the cylindrical connector offerings
from Amphenol with EMI/EMP filter transient protection.
There are also many rectangular filter connectors that are
offered by Amphenol which include:
• MIL-DTL-24308 D-Sub
•
MIL-DTL-83513 Micro D
•
ARINC 404/600
• DOD-83527 Rack and Panel
•
MIL-DTL-83733 Rack and Panel
Rectangular filter interconnects are manufactured and
supplied by Amphenol Canada.
Advantages of Filter Connectors:
• Reduction in overall weight and space with the
elimination of external filter circuits
•
Reduction of solder junctions
• Increase in reliability due to fewer connections
• Fragile filter elements protected from handling and
environmental damage
• Pre-testing from factory and ready for installation
T
SJT
JS
EMI Filter/
Accessories HD38999
Printed
Circuit Board
Transient
App Tools High Density
FTV
Subminiature Tri-Start,
MIL-DTL-38999 Series
III, Metal or Composite
shells with Filter
Protection.
FLJT
Subminiature LJT,
MIL-DTL-38999
Series I with Filter
Protection.
Filter AN
Connector
MIL-DTL-5015
Type Connectors
with Filter
Protection.
See Catalog
12-120
FJT
Subminiature JT,
MIL-DTL-38999
Series II with Filter
Protection.
FCTV with Stand-off
Flange
Filtered Tri-Start
connectors with
composite shells for
attachment to printed
circuit boards.
FPT
Miniature
MIL-DTL-26482
Series I with Filter
Protection.
See Catalog
12-120
Filter Contacts Combined with
High Speed Contacts
Filter Connectors can incorporate high
frequency coax, twinax,
triax, quadrax and
differential twinax
contacts.
MOV Connectors
MOV’s act as a variable resistor
to efficiently dissipate energy.
MOV can be
packaged singularly
or in combinations
with other EMI
Header Assemblies
Allow for easy separation and easy
termination of connectors when
attaching to flex
or printed circuit
boards. Allow for
electrical testing
that would
adversely affect
sensitive diodes,
MOV’s or filter
capacitors.
125
Contact Amphenol Aerospace for more information 800-678-0141 • www.amphenol-aerospace.com
Options
Series III TV
Amphenol
Aerospace
The Amphenol
®
EMI filter connector utilizes two manufacturing
technologies to provide the user with the most cost effective
performance across the frequency range. (For EMP perfor-
mance data, see pages 172-175).
The tubular design offers over 40 years of proven field
reliability. All filter contacts within the connector share a
common ground plane, which is connected to the connector
shell. The pin to pin isolation is 85 dB minimum at 100 MHz.
The planar design joins pins to a multi-layered ceramic forming
an array sub-assembly, with a peripheral ground which is
connected to the connector shell via a ground spring. Pin to
pin capacitance is less than 50 pf with a pin to pin isolation of
85 dB minimum at 100 MHz. Filter contacts for both designs
contain either a pi passive element network comprised of a
ferrite inductor and ceramic capacitor, or a single capacitor.
EMI Capabilities
for maximum design flexibility
For planar designs other filter networks are available, ie.
T Type, L-C Type, C-L Type and C Type. An encapsulant of
oven-cured epoxy in the rear provides:
•
Mechanical and thermal insulation of the ceramic
elements – mechanical loading can be accomplished
without capacitor damage. Pins can be bent 90° and
straightened with no damage to the filter.
• Hermeticity (4.6 x 10
-3
cc/sec) – prevents water from
entering through the rear of the connector in high
humidity environments. Amphenol recommends using
metal protection caps during cleaning operations.
SJT
SJT
Series I LJT Series II JT
TUBULAR ASSEMBLY
Gasket
PLANAR ASSEMBLY
Gasket
Shell
Grounding
Ring
Oven Cured
Epoxy
Potting Seal
Ground Plate
HD38999 Accessories
EMI Filter/
Printed
High Density App Tools
Transient
Circuit Board
Shell
Filter
Contact
Assembly
Contact and
Planar
Assembly
Interfacial
Seal
Ferrite
Hard Faced
Insert
Oven Cured
Epoxy
Interfacial
Seal
Hard Faced
Insert
Pi Type Tubular Contact Assembly
External Margin
Ground Electrode
Internal Margin
Ferrite Inductor
Pi Type Planar Array Assembly
Solder Washer
or Spring
Clip
Ferrite Inductor
Ground
Electrode
Solder Joint
Ceramic Capacitor
Hot Electrodes
Solder Joint
External Margin
Grounding Ring
Hot
Electrode
Options
126
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EMI Capabilities
continues
Amphenol
Aerospace
Planars, MOV’s, Tubular and Diode Contacts
Series III TV
Amphenol provides a wide range of filtering solutions. You
can select your options for your particular interference
threats - VHF, UHF, HF or other filter ranges, then couple
with a connector package of your choice. Or give Amphenol
your custom shell design requirements for assistance in
designing your unique filter solution.
EMI Filter connectors are intended for use in temperatures
from –55°C to +125°C. Attenuation will change with feed-
through current and temperature.*
To assure reliability, connectors may be subjected to an
attenuation performance test verifying proper assembly and
grounding of the filters. Attenuation data on filter per-
formance is stated in reference to a 50 ohm impedance
system in order to allow filter performance to be more
easily translated into real world impedances. Those inter-
ested in determining the expected filter performance in an
impedance system other than 50 ohms may refer to page
131 of this catalog or may contact Amphenol Aerospace for
further assistance.
It is suggested that the user analyze his system
requirements for EMI protection in the following areas:
• Working voltage (DC or AC and Frequency)
• Peak voltage
• Desired attenuation at a given frequency level
•
Any special capacitance limitations
Series II JT Series I LJT
Planar Array
Assembly
Capacitor and
MOV Planars
Tubular Filters and
Diode Contacts
T
SJT
JS
EMI Filter/
Accessories HD38999
Printed
Circuit Board
Transient
App Tools High Density
Contact Options
• Coaxial, concentric twinax, triax and quadrax contacts can be
included in arrangements of filtered contacts for signal or power
circuits (See Amphenol catalog 12-130, High Frequency
Contacts for Multi-Pin Connectors).
• Filter contacts with differing cut-off frequencies can be mixed in
any given insert arrangement. (ratio 100:1 typical)
• Ground, insulated or filter contacts can be combined within the
same connector to meet unique or changing frequency
protection requirements.
•
Thermocouple contacts
•
Diodes for EMP
Definition of Filter Contacts:
MF-1
HF-1
VHF-1
UHF-1
Medium Frequency
50 dB performance between 300 - 2999 KHz
High Frequency
50 dB performance between 3 - 29 MHz
Very High Frequency
50 dB performance between 30 - 2999 MHz
Ultra High Frequency
50 dB performance between 300 - 2999 MHz
Methods of Wire Termination
•
•
•
•
Solder cup - wire termination
PCB termination (Pre-tinning is available)
Solderless wrap
Amphenol
®
UTS (Universal Termination System) allows crimp
termination. It uses crimp insertable socket contacts on
conductor wires. Sockets mate with filter pins within the
connector body. (Socket type M39029/57). (For further contact
information, see section, MIL-DTL-38999 Series I & II).
•
Weld terminal for thermocouple contacts
Filter contacts can be provided in most frequencies in
contact sizes 22 or larger. Consult Amphenol Aerospace
for availability.
Tubular connector designs will meet 3 amps RF current
from –55°C through +125°C. Planar connector designs
will meet 5 amps.
* More in-depth information on attenuation is available in:
L-1146, General Design Guideline for EMI Filters and/or
TVS (Transient Voltage Suppression) Connectors.
Also for further information ask for:
L-1145, How to Specify Filter Connectors.
127
Contact Amphenol Aerospace for more information 800-678-0141 • www.amphenol-aerospace.com
Options
Series III TV
Amphenol
Aerospace
Adapters
Filter adapters eliminate replacement of either existing mated pair. The
adapter provides the circuit protection at the MF, VHF and UHF levels,
and is an effective and economical method of introducing EMI/EMP
protection to an installed system. Adapters are to be placed between
mating faces. (See pages 171).
Printed Circuit Board Mount
Receptacle shell modifications that allow mounting directly to a PC board
or flex header. Stand-off shells are available in different configurations.
These offer improved reliability by eliminating external spacers and
washers. (See pages 140, 141, 146, 147,160 and 163).
Hermetic
The hermetic filter connector, while only approximately 1/2 inch longer
than standard series connectors, provides all the benefits of a hermetic
connector, plus EMI protection for sensitive circuits. The filter assembly is
protected by a fused glass insert within a unique steel housing. This design
provides the capability to tolerate high level static pressure while
maintaining a low level leakage rate. Consult Amphenol Aerospace for
more information.
Composite
Composite shell filter connectors meet the MIL-DTL-38999, Series III
dimensional length, and offer a light-weight, corrosion resistant, durable
connector with the same high performance features as its metal counter-
part. The composite filter connector utilizes planar technology to
accommodate VHF-1 or better electrical performance characteristics.
(See pages 138-141).
ESD Protection
Filter connectors with ESD (Electrostatic Discharge) protection are
available. These MIL-DTL-38999 Series I and III connectors have an added
feature of a Faraday Cage to shunt electrostatic discharge events to the
conductive enclosure on which the con-
nector is mounted.
(See page 203).
Filtered Plugs
Filtered Plugs are designed for
applications where EMI protection is
essential, but access to the receptacle
is denied. Designed with the same com-
Hermetic filter connector
ponents as a standard filter receptacle,
the filtered plug offers the option of being
mounted on the cable harness. It is a cost effective method of achiev-
ing EMI protection when length restrictions prohibit
inclusion of an adapter to the system. Consult Amphenol
Aerospace for availability.
Diode Connectors
Diode Connectors offer versatility with transient protection for sensi-
tive circuits, such as TTL lines. Diodes can stand alone or be com-
bined with other filters. (Pages 174-175).
Filter Connector Options
Series I LJT Series II JT
HD38999 Accessories
EMI Filter/
Printed
High Density App Tools
Transient
Circuit Board
SJT
SJT
Cylindrical Filter Protection Connectors are offered
in a wide range of styles, with custom designs for
special applications.
Filter Adapters can be attached to connectors to
provide EMI/EMP protection.
Composite shell stand-off
Filter 38999 connector
Filtered plug
Options
Diode Connectors
Shunting Assembly
Amphenol’s Energy Shunting Assembly is a simple, compact unit which provides lightning and electromagnetic pulse
protection of systems in which many signal lines enter sensitive electronic equipment. (Page 176).
Contact Amphenol Aerospace for more information 800-678-0141 • www.amphenol-aerospace.com
ESA - Energy Shunting
Assembly
128
Filter Selection Data
Amphenol
Aerospace
Series III TV
Amphenol
®
EMI Connectors are produced with several types of filters.
They are all low band pass filters with the following configurations:
Pi -
Typical of the VHF, UHF and MF filter
Cascaded Pi -
Typical of the HF filter. It consists
of two VHF Pi filters on a common
pin and is available in tubular
designs only.
Capacitor *-
Consists of a feed-through capacitor without any ferrite.
It can be 50pf to 1µf and carry the MF, HF and
VHF designation depending on its typical 50dB
performance.
L-C *-
Typical of HF, VHF and UHF filter.
Low source /
high load impedance.
C-L *-
Typical of HF, VHF and UHF filter.
High load impedance /
low source.
T *-
Typical of HF, VHF and UHF filter.
Low source /
low load impedance.
* Consult factory for attenuation performance values.
Medium
Frequency FilterF
Parameters
MF-1
(Pi)
HF-1
(Cascaded Pi)
VHF-1
(Pi)
VHF-2†
(Pi)
UHF-1†
(Pi)
UHF-2†
(Pi)
High
Frequency FilterF
Very High
Frequency Filter
Ultra High
Frequency Filter
Series II JT Series I LJT
T
SJT
JS
EMI Filter/
Accessories HD38999
Printed
Circuit Board
Transient
App Tools High Density
150kHz
Minimum
Attenuation
(Test Points)*
Maximum Working Voltage
(User must specify DC or
AC)††††
15MHz
50MHz
100MHz
DC†††
20dB
–
–
80dB
50VDC
100
volts DC
13.0
amps
7.5
amps
not
available
3.0
amps
250
megohms
1.0
microfarad
–
50dB
80dB
–
200VDC
500
volts DC
13.0
amps
7.5
amps
not
available
3.0
amps
10
gigaohms
16
nanofarads
–
–
–
62dB
200VDC
500
volts DC
13.0
amps
7.5
amps
5.0
amps
3.0
amps
10
gigaohms
7
nanofarads
4.6 x 10
-3
cc/sec
–55°C to +125°C
–
–
–
46dB
200VDC
500
volts DC
13.0
amps
7.5
amps
5.0
amps
3.0
amps
10
gigaohms
2.5
nanofarads
–
–
–
18dB
200VDC
500
volts DC
13.0
amps
7.5
amps
5.0
amps
3.0
amps
10
gigaohms
375
picofarads
–
–
–
28dB
200VDC
500
volts DC
13.0
amps
7.5
amps
5.0
amps
3.0
amps
10
gigaohms
710
picofarads
Dielectric Withstanding Voltage
Capability (for 5 sec. with 10 milliamperes
max. charging current)FF
Size 16 contacts
Maximum Feed-thru
Current
(DC and/or Audio
Frequency R.M.S.)
Size 20 contacts
Size 22 contacts
Maximum RF Current
Minimum Insulation Resistance
Typical Capacitance**
Air Leakage††
Operating Temperature Range
*
**
†
††
†††
††††
F
FF
When tested at 25°C per MIL-STD-220.
When measured at a frequency of 1 ±.1kHz and a voltage not exceeding 1.0 V.A.C.R.M.S. at +25°C.
Consult Amphenol, Sidney, NY or your Amphenol representative for part number.
Lower leakage rates are available upon request.
Summation of the DC and low level AC super-imposed peak voltage.
Consult Amphenol, Sidney, NY whenever AC voltage is present.
Consult Amphenol, Sidney, NY or your Amphenol representative for availability.
Higher DWV ratings are available upon request. Consult Amphenol, Sidney, NY.
129
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