Developed and produced by Packard-Hughes Interconnect
(PHI), the MIL-C-28876 Fiber Optic Connector features low
optical insertion loss, repeatability, exceptional strain relief,
and reliability in harsh environments. This connector is used
extensively by the United States Navy in shipboard applica-
tion and has been on the United States Government's
Qualified Products List since 1983.
• Available in 2, 4, 6, 8, and 31 channel configurations
• Single and multi-mode capability
• Full environmental sealing
• Utilizes field-proven MIL-T-29504 Termini
• Field maintainable
Fiber Optic Connectors
MIL-C-28876 Fiber
Optic Connectors
QPL Military and Commercial
Equivalent Available
Connector Performance
Durability
Vibration
Mechanical Shock
Thermal Cycling
Corrosion Resistance
Ozone Exposure
Humidity
Fluid Immersion
Crush Resistance
Maintenance Aging
Terminus Retention Force
Insert Retention Axial
Cable Pull Out Force
Cable Seal Flexing
Impact
Flammability
Operating Temperature Range
Storage Temperature Range
500 cycles per EIA-455-21
Per MIL-STD-1344, Method 2005, Condition II & VI
Per MIL-S-901, Grade A Medium Weight
-62°C to +70°C per MIL-STD-1344, Method 1003
500 hour salt spray per MIL-STD-1344, Method 1001
150 PPM/2 hours per MIL-STD-1344, Method 1007
240 hours per MIL-STD-1344, Method 1002
Per MIL-STD-1344, Method 1016
225 pounds per MIL-STD-1344, Method 2008.1
Per MIL-STD-1344, Method 2002
22 pounds minimum per MIL-STD-1344, Method 2007
100 PSI minimum per MIL-STD-1344, Method 2010
162 Pounds minimum per MIL-STD-1344, Method 2009
100 cycles per MIL-STD-1344, Method 2017
Per MIL-STD-1344, Method 2015
Per MIL-STD-1344, Method 1012
-54°C to +65°C
-62°C to +71°C
page 1
MIL-C-28876 Fiber Optic Connectors
STANDARD MATERIALS AND PLATING
Description
Materials
Finishes
Insert
Boot, Strain Relief
Connector and Backshell Housings
Aluminum Alloy
Fluorosilicone
Aluminum Alloy
Anodize
None
Cadmium Plate (Olive Drab) Over Electroless Nickel
OPTICAL PERFORMANCE DATA
Consult factory for non-standard and custom specifications. The average insertion loss is .5dB for ceramic termini. These
figures are derived from actual field measurements taken from thousands of mated pairs of termini across our line of multi-
channel connectors. The source launch wavelengths were 850 and 1300 nanometers.
CONNECTOR: MIL-SPEC ORDERING NOMENCLATURE
M28876/
7
B
1
2
P
1
*
See
Table
I
See
See
Table Table
II
III
See
Terminus
Table
Cavity
IV
Designator
P
= Pin
S
= Socket
Keying
Position
Designator
1
thru
6
Table I
Connector Type
Wall Mount Receptacle
Wall Mount Receptacle
Wall Mount Receptacle
Wall Mount Receptacle
In-Line Receptacle
Plug
Plug
Plug
Plug
Jam Nut Receptacle
Jam Nut Receptacle
Jam Nut Receptacle
Jam Nut Receptacle
Table IV
Backshell
Maximum Cable Diameter Listed Inches (mm)
Number
Shell Size
Designator
11
13
15
23
1
.250 (6.35) .285 (7.24) .515 (13.08) .866 (22.00)
2
.346 (8.79) .256 (6.50) 1.000 (25.40)
3
.375 (9.53) .600 (15.3)
(Omit if no strain relief.)
Strain Relief
None
Straight
45°
90°
Straight
None
Straight
45°
90°
None
Straight
45°
90°
Slash Sheet Designator
1
2
3
4
5
6
7
8
9
11
12
13
14
Table II
Shell Size
11
13
15
23
Table III
# of Cavities
2
4
6
8
31
When ordering a /1, /6, or /11
connector type and DO NOT
require insert retention nut
and pressure sleeve (to
expose accessory thread for
alternate backshell addition),
add N to the end of part
number nomenclature
(e.g.: M28876/6B1P1N)
Shell Size Designator
A
B
C
F
Shell Size
11
13
15
15
23
Insert Designator
1
1
2
1
1
page 2
MIL-C-28876 Fiber Optic Connectors
CONNECTOR: COMMERCIAL EQUIVALENT ORDERING NOMENCLATURE
Number of
Terminus
Cavities
04
Backshell
Number
Designator
2
All Numbers
End with “S”
*Except as
shown below
S
Assembly
Configuration
1145846—
Shell Size
Designator
B
Terminus
Style
P
Keying
Position
1
See
Table
I
See
Table
II
See
Table
III
See
Table
IV
P
= Pin
S
= Socket
1
thru
6
Table I: Assembly Configuration
PHI Number
Connector Type
Strain Relief
4565141
Wall Mount Receptacle
None
1145840
Wall Mount Receptacle
Straight
1147630
Wall Mount Receptacle
45°
1147640
Wall Mount Receptacle
90°
1145841
In-Line Receptacle
Straight
4565143
Plug
None
1145846
Plug
Straight
1147636
Plug
45°
1147646
Plug
90°
4565142
Jam Nut Receptacle
None
1145844
Jam Nut Receptacle
Straight
1147634
Jam Nut Receptacle
45°
1147644
Jam Nut Receptacle
90°
4567626*
Wall Mount Receptacle
Noneª
4567627*
Jam Nut Receptacle
Noneª
6567628*
Plug
Noneª
*Part Numbers end with “H” in place of “S”.
ªNo strain relief, no insert retention nut and pressure sleeve, to expose
accessories thread for backshell addition.
Table II: Shell Size Designator
Shell Size
Designator
A
B
C
F
Shell Size
11
13
15
23
Number of
Terminus Cavities
2
4
6 or 8
31 or 18
Table III: Number of Terminus Cavities
M28876 Insert
Arrangement
# of Cavities
02
04
06
08
31
18
Shell Size
11
13
15
15
23
23
Equivalent
1
1
2
1
1
2
MIL-SPEC Equivalent To
Packard-Hughes Interconnect
Table IV: Backshell Number Designator
Backshell
Maximum Cable Diameter Listed Inches (mm)
Number
Shell Size
Designator
11
13
15
23
1
.250 (6.35) .285 (7.24) .515 (13.08) .866 (22.00)
2
.346 (8.79) .256 (6.50) 1.000 (25.40)
3
.375 (9.53) .600 (15.3)
(Omit if no strain relief.)
MIL-SPEC
Number
M28876/1
M28876/2
M28876/3
M28876/4
M28876/5
M28876/6
M28876/7
M28876/8
M28876/9
M28876/11
M28876/12
M28876/13
M28876/14
PHI
Number
4565141S
1145840S
1147630S
1147640S
1145841S
4564143S
1145846S
1147636S
1147646S
4565142S
1145844S
1147634S
1147644S
page 3
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