Amphenol
481 Series
Rack and Panel Environmental Connectors
Description
The 481 Series is a Filter connector plug with either pintail or
solder bucket type fixed pin contacts. These are designed to
meet the mechanical and environmental requirements of MIL-
C-24308. These connectors are available with filter, power
grounding contacts and EMI sealing plugs or any combination
thereof.
Mating Connector Information
481 Series mate with all connectors conforming to MS 18269
and MS 18270 of MIL-C-24308 and Amphenol MIN-RAC 17
®
Series miniature connectors.
Amphenol
Introduction
AMPHENOL’s Filter connectors are a system of reliability
engineered receptacles, plugs, contacts and accessories,
designed to provide a wide range of performance and
servicing features not previously available with ordinary EMI
filtering connectors.
These connectors are rugged enough to operate reliably
under high physical stress, and in the demanding
environmental conditions required of power connections.
The patented stress isolated EMI filter is composed of a
ceramic element attached to a sturdy contact in a way that
dampens all connector stresses and virtually eliminates the
chance of ceramic fracture due to vibration, thermal and
physical shock.
Once inserted in the connector, the filter contact is engaged
by a Microstrip grounding plate designed to achieve
maximum insertion loss and to inhibit resonances due to
series inductance.
The use of filter connectors has the following advantages:
•
•
•
•
•
Space saving
Weight saving
Reduction in solder connections
Eliminates requirement for RFI screened box
Provides low impedance ground plane for filter network
FILTER HERE
‘D’
BACKSHELL
NOT HERE
‘D’
BACKSHELL
Design Features
1. One piece aluminium alloy shell with clear chromate finish
over cadmium plate. Shell with increased flange width for
improved shielding.
2. One panel cut-out for front and rear mounting.
3. Thermoset Inserts.
4. High temperature silicone rubber moisture seal.
5. Microstrip EMI grounding plate – plated copper alloy.
6. High temperature contact heat dissipator plate.
7. Stress isolated filter contact.
1
2
3
4
5
6
7
Insert Arrangements
1 2 3 4 5
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9 10 11 12 13
6 7 8 9
9 10 11 12 13 14 15
14 15 16 17 18 19 20 21 22 23 24 25
SHELL SIZE 1
(9 CONTACTS)
SHELL SIZE 2
(15 CONTACTS)
SHELL SIZE 3
(25 CONTACTS)
1 2
3 4
5
6
7 8
9 10 11 12 13 14 15 16 17 18 19
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
SHELL SIZE 4
(37 CONTACTS)
SHELL SIZE 5
(50 CONTACTS)
2
Dimensions
A MAX
B MAX
X X X X X
J MAX
F
MAX
M
MIN
H MAX
E MAX
D MAX
SEE DETAIL A
CONNECTOR AND
CONTACT TYPE IDENTIFICATION
C NOM
2 MOUNTING HOLES Ø d
K MAX
G MAX
APPLICABLE TO SOLDER
CONTACTS ONLY
DETAIL A
L MAX
CONTACT COLOUR CODE
APPLICABLE TO SOLDER BUCKET
TERMINATIONS ONLY
NO COLOUR
EMI FILTER
BAND
CONTACTS
GREEN
POWER
COLOUR BAND
CONTACTS
RED COLOUR
GROUND
BAND
CONTACTS
SHELL
SIZE
1
2
3
4
5
A
1.226
31.14
1.552
39.42
2.097
53.26
2.742
69.65
2.650
67.31
B
.750
19.05
1.072
27.23
1.612
40.94
2.254
57.25
2.162
54.91
C
.984
24.99
1.312
33.32
1.852
47.04
2.500
63.50
2.406
61.11
D
E
F
G
H
J
K
.728
18.49
1.048
26.62
1.589
40.36
2.236
56.79
2.135
54.23
L
M
d
.400
10.16
.602
15.29
.236
5.99
.960
24.38
.057
1.45
.840
21.34
.415
.063/.035 .125/.115
10.54
1.60/0.89 3.18/2.92
.514
13.05
.717
18.21
.534
13.56
DIMENSIONS SHOWN OVER BLUE BACKGROUND ARE IN MILLIMETRES
Availability of Terminations
.120 MAX
3.05
CONTACT
PART NUMBER
481-57
481-59
481-65
481-66
481-68
481-92
481-67
481-61
481-63
DIM A
DIA B
ØB
.140
3.56
.030
.028
0.76
0.71
A MAX
Assembly may comprise of connector fitted with all pintail or all solder
bucket terminations, or a combination of both. Pintails may be obtained
in different diameters, shapes and lengths to meet users’ special
requirements. Consult factory for further information
.352
.245
8.94
6.22
Installation
RECOMMENDED PANEL
CUT OUTS
(Front and Back Mounting)
.120 DIA
3.05
.140 R. MAX TYP 3.56
SHELL
SIZE
1
2
A DIM
MIN
0.790
20.07
1.110
28.19
1.650
41.91
2.300
58.42
2.215
56.26
B
+.000
-.006
-0.15
0.987
25.07
1.315
33.40
1.855
47.12
2.502
63.55
2.410
61.21
C
+.032
-.000
+0.81
0.440
11.18
0.440
11.18
0.440
11.18
0.440
11.18
0.554
14.07
3
C
3
10
A
B
o
4
5
Contact Specifications
(Typical Contacts)
CONTACT TYPE
Contact Part Number
Pintail Termination
(See Page 3)
Solder Bucket Termination
Circuit Type
Pass Band
dc to 3dB cut off Frequency Fca =
Capacitance (Picofarads) @25 C
- minimum at 1 KHz
Working Voltage
Sea Level
(50mA max. charging current)
at 85 C
at 125 C
Dielectric Withstanding Voltage (dc) @ 25 C
(50mA max. charging current)
Insulation Resistance (gigahoms) –25 C
- Minimum
Current Rating (amperes)
- maximum ** dc and low frequencies
Filter rf Current (amperes)
- minimum ** at any frequency
Operating Temperature ** ( C)
Insertion Loss (decibels) @ 25 C
- minimum per MIL STD-220 (No Load) at
(Performance in Mated Connectors)
For Typical Insertion Loss
See below (results will vary with
temp. source and load impedance)
Crosstalk Attenuation (decibels)
(coupling between contacts)
- minimum at 100MHz
o
o
o
o
o
o
o
FILTER
481-92
481-55
P1
15MHz
(-0)
(+100%)
dc
ac (rms)
dc
ac (rms)
500
200
125
150
125
500
5
3
0.25
-55 to +150
0.1 MHz
1 MHz
10 MHz
100 MHz
1000MHz
-
-
-
20
35
-
-
5
40
55
-
15
33
45
50
Same performance
as for ‘C’ version
under Mil-Std-220
but improved filter-
filtering offered for
other Zs & Z1 values
30
60
481-63
481-57
481-8
P1
4.5MHz
1750
200
125
150
125
500
5
3
481-67
481-65
481-26
C
481-15
LRC
200KHz
50000
100
50
100
50
300
10
481-61
481-66
481-16
CLR
POWER
481-68
481-20
NA
NA
NA
500
300
500
300
1000
7.5
NA
NA
Power to Filter
Filter to Filter
* Consult AMPHENOL FACTORY if your filter needs are not reflected in this catalogue.
** Upper limit is the maximum allowable internal hot spot temperature resulting from any combination of electrical and load ambient.
Typical Insertion Loss
Tests performed in strict accordance with MIL-STD-220* (No-Load) on Contacts in a 481 Series connector mated with a
Standard Non-Filter connector.
CAUTION – Comparison with other filter connector manufacturers data may be misleading unless the following factors are
taken into account:
(1) is official (unmodified) MIL-STD-220 test method ultilised as basis for performance depicted? Modification will result in
an apparent (ficticious) higher response!
(2) is performance shown for filter contacts installed in connectors? If performance is based on discrete (single) contacts
tested to MIL-STD-220, higher levels of I.L. will be indicated due to grounding limitations inherent in any connector
design.
CAPACITANCE VALUES
80
1750pF
500pF
50000pF
60
40
481.15, - 16, - 26
20
0
481-8
481-55
0.1
FREQUENCY (MHz)
1
10
100
1000
4
481 Series
Ordering Information by Amphenol Part Number
481 - 1 3 25 0 - 100
Series Number
481
Contact Combination Code
See Note 1
Connector Type
1 – Plug with Pin Contacts
No. of Coaxial Contacts
0
Shell Size
1, 2, 3, 4, 5
No. of Size 20 Contacts
09, 15, 25, 37, 50
Contact Combination Codes
Note 1 –
Customer may select any combination of filter, power, grounding contacts or EMI sealing plugs. Contact Combination
Code will be reflected by the last three digits in the above part number and will be assigned by the factory.
Part Number
Solder Bucket
Pintail
Standard Contact Combination Codes
- XXX
- 100
- 200
- 300
- 400
- 500
Contains only 481-8 Filter Contacts
Contains only 481-15 Filter Contacts
Contains only 481-16 Filter Contacts
Contains only 481-26 Filter Contacts
Contains only 481-55 Filter Contacts
Filter Contact
Power Contact
Grounding Contact
EMI Sealing Plug
See Page 4
481-20
481-25
481-24
481-68
481-59
Notice:
Products are sold subject to Amphenol’s Conditions of Sale (“the standard conditions”). All specifications and statements
contained herein are believed to be correct at the time of printing but no representation or warranty, express or implied, is given as to any
specification or statement contained herein. Product specifications including performance characteristics are typical only and subject to
deviation. Specifications are also subject to change without notice. Users should not assume that all safety measures are indicated or that
other measures may not be required. No representation or warranty, express or implied, is given that any use of products (including any
stated or suggested use) does not infringe any patent, registered design or other third party rights and no stated or suggested use of
products can be taken to recommend any such infringement.
Amphenol
Thanet Way, Whitstable, Kent. CT5 3JF Tel: 01227 773200 Fax: 01227 276571
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