Amphenol 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 cylindricals can be incorporated with fil-
ter devices:
• MIL-DTL-38999
• MIL-DTL-5015
• MIL-C-26482
• MIL-C-27599
• MIL-C-83723
• MIL-C-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
• Programmable filtered connectors with rear removable and
rear insertable crimp contacts
• Filter connectors with ESD protection
• Combinations of filtering devices within one connector pack-
age
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 sup-
plied by Amphenol Canada. See further information at the
end of the catalog.
Advantages of Filter Connectors:
• Reduction in overall weight and space with the elimi-
nation 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
FTV
Subminiature Tri-Start,
that are rear insert-
able and rear remov-
able. Contacts can
be replaced easily
with standard
circuit boards.
MOV Connec-
tors
MOV’s act as a
variable resistor
to efficiently dis-
MIL-DTL-38999
Series III, Metal or
Composite shells
with Filter
Protection.
M81969
insertion/removal
tool.
FLJT
Subminiature LJT,
MIL-DTL-38999
sipate energy.
MOV can be pack-
aged singularly or
in combinations
with other EMI Fil-
FJT
Subminiature JT, MIL-DTL-38999 Series II
with Filter
Protection.
Series I with Filter Protection.
tering.
FCTV with Stand-off
Flange
Filtered Tri-Start
connectors with com-
posite shells for
attachment to printed
Filter AN
Connectors
MIL-DTL-5015
Type Connectors
with Filter
Protection.
Programmable
Filter Connectors
With crimp contacts
FPT
Miniature MIL-C-
26482 Series 1
with Filter
Protection.
Header
1
EMI Capabilities
for maximum design flexibility
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 63-66).
The tubular design offers over 40 years of proven field reliabil-
ity. 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 ele-
ment network comprised of a ferrite inductor and ceramic
capacitor, or a single capacitor.
For planar designs other filter networks are available, ie. T
Type, L-C Type and C-L 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 capaci-
tor 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 enter-
ing through the rear of the connector in high humidity envi-
ronments. Amphenol recommends using metal protection
Pi Type Tubular Contact Assembly
Ground Electrode
External Margin
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
caps during cleaning operations.
* 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:
2
EMI Capabilities, cont.
Planars, MOV’s, Tubular and Diode Contacts
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 Amphe-
nol 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 eas-
ily translated into real world impedances.
Those interested in determining the expected filter perfor-
mance in an impedance system other than 50 ohms may
refer to page 7 of this catalog or may contact Amphenol
Aerospace for further assistance.
It is suggested that the user analyze his system require-
ments 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
Planar Array
Assembly
Capacitor and
MOV Planars
Tubular Filters and
Diode Contacts
Definition of Filter Contacts:
MF
HF
VHF
UHF
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
Filter contacts can be provided in most frequencies in con-
tact 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.
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 cutoff frequencies can be mixed in
any given insert arrangement. (ratio 20:1 typical)
• Programmable filter connectors have crimp rear removable
and rear insertable contacts. These provide benefits not avail-
able in fixed EMI/RFI connectors. Modifications of the EMI per-
formance can be made simply with changing the contacts.
(See pages 56-60)
• Ground, insulated or filter contacts can be combined within the
same connector to meet unique or changing frequency protec-
tion requirements.
• Thermocouple contacts
• Diodes for EMP
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 con-
ductor wires. Sockets mate with filter pins within the connector
body. (Socket type M39029/57). (For further contact informa-
tion, see catalog 12-090, MIL-DTL-38999 Series I & II).
• Weld terminal for thermocouple contacts
3
Filter Connector Options
Other Filter Connector Options include:
• Plug shells with grounding fingers for shielding against external EMI.
(See page 76).
• 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 pro-
tection to an installed system. Adapters are to be placed between mating
faces. (See pages 61, 62).
• 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 wash-
ers. (See pages 10).
• 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 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 accom-
modate VHF-1 or better electrical performance characteristics. (See
pages 9-13).
• Filter connectors with ESD (Electrostatic Discharge) protection are avail-
able. These MIL-DTL-38999 Series III connectors have an added feature
of a Faraday Cage to shunt electrostatic discharge events to the conduc-
tive enclosure on which the connector is mounted. (See page 70).
• Filtered Plugs are designed for appli-
cations where EMI protection is
essential, but access to the recepta-
cle is denied. Designed with the same
components 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 achieving EMI protection when
length restrictions prohibit inclusion of
an adapter to the system. Consult
Hermetic filter connector
Amphenol Aerospace for availability.
• Diode Connectors offers versatility
with transient protection for sensitive circuits, such as TTL
lines. Diodes can stand alone or be combined with other fil-
ters. (Pages 65, 66).
• Receptacles with EMP protection are available for MIL-DTL-
38999 Series IV. (Pages 44-46).
• Amphenol’s Energy Shunting Assembly is a simple, compact
unit which provides lightning and electromagnetic pulse pro-
tection of systems in which many signal lines enter sensitive
electronic equipment. (Page 67).
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.
Filtered plug
Composite shell stand-off
Filter 38999 connector
ESA - Energy Shunting
Assembly
Diode Connectors
4
FLJTP
box mounting receptacle
(back panel mounting, UTS crimp)
P
*
Z
MAX.
N
S
R
M
.905 +.005
–.000
S
R
P
*
1.403
MAX.
K
21-47X2XX-XXX
.100
MAX.
T
4 HOLES
.005 M
N
D
K
1
.921
1.021
+.005
–.000
+.006
–.000
1.921
MAX.
21-48X2XX-XXX
UTS (Crimp) Contact
MIL-C-32029/57
For ordering information, see how to order page 72.
Plug movement required to clear FLJT receptacles: .625 min.
* Acceptable panel thickness for back panel mounting a standard receptacle.
SHORT SHELL
VHF/UHF Filters
D
Dia.
±.005
K
Dia.
+.000
–.006
K
1
Dia.
+.000
–.007
M
+.000
–.006
N
Dia.
+.001
–.005
P
Max.
Panel
Thickness
S
+.011
–.010
T
Dia.
±.005
Size 20
Contact
Size 16 or
16 & 20
Contacts
Size 22
Contact
Shell
Size
R
(TP)
Z Max.
Z Max.
Z Max.
9
11
13
15
17
19
21
23
25
.299
.427
.541
.666
.791
.897
1.022
1.147
1.272
.437
.562
.688
.812
.938
1.062
1.188
1.312
1.438
.561
.687
.811
.937
1.061
1.187
1.312
1.437
1.562
.820
.820
.820
.820
.820
.820
.790
.790
.790
.572
.700
.850
.975
1.100
1.207
1.332
1.457
1.582
.234
.234
.234
.234
.234
.234
.204
.204
.193
.719
.812
.906
.969
1.062
1.156
1.250
1.375
1.500
.938
1.031
1.125
1.219
1.312
1.438
1.562
1.688
1.812
.128
.128
.128
.128
.128
.128
.128
.147
.147
.672
.672
.672
.672
.672
.672
.672
.672
.672
.763
.763
.763
.763
.763
.763
.763
.763
.763
.632
.632
.632
.632
.632
.632
.632
.632
.632
All dimensions for reference only.
32
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