Cannon 50 Ohm Connectors
SSMB / SSMC
This range of 50 ohm microminiature radio frequency
connectors is suitable for both military and commercial
equipment operating at frequencies up to 4 GHz (SSMB)
and 12.4 GHz (SSMC). They provide a choice of Snap-on
(SSMB) or Screw-on (SSMC) and are available for a wide
range of flexible cables.
SSMC connectors are used where a positive mechanical
engagement is required and where space permits the
use of torque wrenches. SSMB connectors are quick
disconnect versions of the SSMC and are used in
applications where limited space prohibits the use of
torque wrenches or when components or modules must
be quickly changed to keep down time to a minimum.
Key Features
• Small size
• Low mass
• Close packing density
• Used in airborne applications
MATING INTERFACE
SSMB (SNAP-ON)
CLOSED ENTRY CONTACT
Ø1,37
(.054)
MIN
Ø1,35
(.053)
MAX
Ø4,83
(.190)
MAX
Ø2,67
(.105)
MAX
3,10
(.122)
1,91
(.075)
MIN
Ø0.36/0.38
(.014/.015)
0,84
(.033)
MIN
0,00
(.000)
MIN
3,10
(.122)
MIN
1,78
(.070)
MAX
RP
SEE NOTE
#2
PLUG
0,00
(.000)
MIN
0,84
(.033)
MAX
RP
JACK
0,84
(.033)
MIN
1,91
(.075)
MIN
SSMC (SCREW-ON)
6,40 UNF-2B
THREAD
3,96
(.156)
A/F HEX
CLOSED ENTRY
CONTACT
Ø1,37
(.054)
MIN
Ø2,54
(.100)
MAX
4,32
(.170)
MIN
3,00
(.118)
0,84
(.033)
MAX
Ø2,57
(.101)
MIN
0,00
(.000)
MIN
RP
0,00
2,29
(.000)
(.090) MAX
MIN
2,29
(.090) MAX
5,08
(.200) MAX
Ø1,35
(.053)
MIN
Ø 0,36/0,38
(.014/.015)
0,00
(.000)
MIN
RP
2,29
(.090)
MIN
2,29
(.090)
MIN
6,40 UNF-2A
THREAD
PLUG
JACK
NOTES
1) Inside diameter of female contact to meet VSWR, mating characteristics and
connector durability, when mated with a 0,36 - 0,38 (.014 - .015) diameter male
contact.
Dimensions shown in mm (inch)
Specifications and dimensions subject to change
2) Must meet the force to engage and
disengage when mated with its
mating part.
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27
Cannon 50 Ohm Connectors
SSMB / SSMC
SPECIFICATIONS
ELECTRICAL
Impedance
Frequency Range
Voltage Rating
Insulation Resistance
Contact resistance
50Ω
SSMB = 0 to 4.0 GHz. SSMC = 0 to 12.4 GHz
At Sea Level = 250 Vrms. at 21km (70k feet) = 60 Vrms
1000 MΩ minimum
Center Contact = 4.0 m
Ω
maximum initial. 6.0 m
Ω
maximum after environment
Outer Contact = 1.0 m
Ω
maximum initial. 1.5 m
Ω
maximum after environment
Braid to Body = 1.0 m
Ω
maximum
Contact Current Rating
Insertion Loss
RF Leakage
Voltage Standing Wave Ratio (VSWR)
To 12.4 GHz or 80% of upper cut-off
frequency of the cable, whichever is lower.
Applicable to 50Ω cables only.(F = GHz)
1.0 A dc maximum
0.30 dB maximum @ 1.5 GHz
SSMB = -40 dB minimum @ 2 - 3 GHz
SSMC = -50 dB minimum @ 2 - 3 GHz
Connector Configuration
SSMB
Cable group
RG178/U, 196/U
RG188/U, 316/U
Straight
1.25 + .02F
1.30 + .02F
Right Angle
1.25 + .03F
1.30 + .03F
Straight
1.20 + .02F
1.25 + .03F
SSMC
Right Angle
1.20 + .03F
1.30 + .02F
MECHANICAL
Engagement Forces
SSMB: Initial = 26.7 N (6 lbs.) max. engagement and 8.9 N(2 lbs.) minimum disengagement.
After 500 matings = 26.7 N (6 lbs.) max. engagement and 4.4 N (1 lb.) min. disengagement.
SSMC: 0.11 Nm (16 in. oz.) torque max.
Mating Torque
Locknut Torque
Coupling Nut Retention
Materials
Finish/Plating
SSMB: N/A
SSMB: N/A
SSMC: 0.2 Nm to 0.23 Nm (28 - 32 in.oz)
SSMC: 111 N (25 lbs. ) minimum
0.28 Nm to 0.35 Nm (40 - 50 in. oz)
Body, Body Components: Brass, half hard. Male and Female Contacts: Beryllium Copper.
Insulators: PTFE. Lockwashers: Phosphor Bronze. Crimp Ferrule: Annealed copper alloy.
Center Contacts: Gold plated. Other Metal Parts: Gold or nickel plated to meet the
finish and corrosion requirements of MIL-C-39012
-65° C to 165° C
MIL-STD-202, Method 101, test condition B, 5% salt solution
MIL-STD-202, Method 204, SSMB: test condition B (15 G's). SSMC: test condition D (20 G's)
MIL-STD-202, Method 213, SSMB: test condition B, 75 G's @ 6 milliseconds, 1/2 sine.
SSMC: test condition C, 100 G's @ 6 milliseconds, 1/2 sine.
MIL-STD-202, Method 107, test condition B, except high temperature shall be 85º C.
High temperature shall be 200ºC for connectors using 200ºC cables.
500 matings minimum
8,9 N (2 lbs.) minimum axial force.
When properly assembled to the compatible single braided coaxial cable, the retention
is equal to the breaking strength of the cable.
Body plating options
The following part number suffices can be specified for SSMB and SSMC connectors.
...220 gold body
...910 nickel body
ENVIRONMENTAL
Temperature Rating
Corrosion (salt spray)
Vibration, High Frequency
Shock
Thermal Shock
GENERAL
Connector Durability
Contact Captivation
Cable Retention
Dimensions shown in mm (inch)
Specifications and dimensions subject to change
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28
Cannon 50 Ohm Connectors
SSMB
PLUGS, JACKS AND RECEPTACLES
Straight Plug
Part Number
Cable Numbers
A
20,01 (.790)
19,33 (.761)
Assembly Instructions
051 - 424 - 3188220
AI 663 (Page 44)
A51 - 424 - 3196220
AI 128 (Page 44)
12,19
(.480)
MAX
A MAX
051 - 424 - 3188220 RG174/U, 316/U
A51 - 424 - 3196220 RG178/U, 196/U
Right Angle Plug
Part Number
Cable Numbers
A
9,55 (.376)
9,55 (.376)
10,16 (.400)
3,96
(.156)
A
MAX
7,62
(.300)
MAX
RP
A51 - 428 - 3188220 RG174/U, 316/U
A51 - 428 - 3196220 RG178/U, 196/U
A51 - 428 - 3875220
RD316
Assembly Instructions
A51 - 428 - 3188220
AI 129 (Page 45)
A51 - 428 - 3196220
AI 696 (Page 45)
A51 - 428 - 3875220
AI 696 (Page 45)
Bulkhead Jack
Part Number
Cable Numbers
A
9,93 (.391)
10,41 (.410)
4,75
(.187)
A/F HEX
A MAX
9,12
(.359)
051 - 427 - 3188220 RG174/U, 316/U
A51 - 427 - 3196220 RG178/U, 196/U
Mounting Plan U (Page 40)
Assembly Instructions AI-128 (Page 44)
Bulkhead Receptacle - Rear Mount
Mounting Nut Outside Panel
Part Number
051 - 443 - 0000220
2,03
(.080)
4,75
(.187)
A/F HEX
3,96
(.156)
A/F HEX
Ø0.91
(.036)
3,99
(.157)
9,20
(.382)
MAX
Mounting Plan U (Page 40)
Dimensions shown in mm (inch)
Specifications and dimensions subject to change
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29
Cannon 50 Ohm Connectors
SSMB
BULKHEAD AND PRINTED CIRCUIT RECEPTACLES
Bulkhead Receptacle - Front Mount
Mount Nut Inside Panel
Part Number
051 - 445 - 0000220
Ø0,91
(.036)
6,69
(.263)
6,76
(.266)
MAX
2,03
(.080)
4,75
(.187)
A/F HEX
3,96
(.158)
A/F HEX
Mounting Plan U (Page 40)
Printed Circuit Receptacle - Straight Jack
Part Number
A51 - 451 - 0000220
3,94
(.155)
6,71
(.264)
0,51
(.020)
4 POSNS
3,96
(.156)
0,51
(.020)
Mounting Plan C (Page 40)
Printed Circuit Receptacle - Straight Plug
Part Number
051 - 452 - 0000220
0,51
(.020)
4 POSNS
12,45
(.490)
3,94
(.155)
Ø4,75
(.187)
Mounting Plan C (Page 40)
Printed Circuit Receptacle - Right Angle Jack
Part Number
A51 - 453 - 0000220
6,05
(.238) 3,81
(.150)
3,94
(.155)
9,75
(.384)
7,77
(.306)
0,51
(.020)
3,96
(.156)
0,51
(.020)
4 POSNS
Mounting Plan C (Page 40)
Dimensions shown in mm (inch)
Specifications and dimensions subject to change
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30
Cannon 50 Ohm Connectors
SSMC
PLUGS AND RECEPTACLES
Straight Plug
Part Number
050 - 424 - 3188220
050 - 424 - 3196220
Cable Numbers
RG174/U, 316/U
RG178/U, 196/U
20,07 MAX
(.790)
Assembly Instructions
050 - 424 - 3188220
AI 663 (Page 44)
050 - 424 - 3196220
AI 128 (Page 44)
Right Angle Plug
Part Number
050 - 428 - 3188220
050 - 428 - 3196220
Cable Numbers
RG174/U, 316/U
RG178/U, 196/U
A
12,19
(.480) REF
4,32
(.170) MAX
RP
3,96
(.156)
10,16 (.400)
9,40 (.370)
A
MAX
Assembly Instructions
050 - 428 - 3188220
AI 286 (Page 45)
050 - 428 - 3196220
AI 696 (Page 45)
Bulkhead Receptacle - Rear Mount
Mounting Nut Outside Panel
Part Number
050 - 443 - 0000220
Ø0,91
(.036)
3,99
(.157)
9,20
(.362)
MAX
2,03
(.080)
4,75
(.187)
A/F HEX
Mounting Plan U (Page 40)
Bulkhead Receptacle - Front Mount
Mounting Nut Inside Panel
Part Number
050 - 445 - 0000220
Ø0,91
(.036)
6,69
(.263)
6,76
(.266)
MAX
2,03
(.080)
4,75
(.187)
A/F HEX
Mounting Plan U (Page 40)
Dimensions shown in mm (inch)
Specifications and dimensions subject to change
www.ittcannon.com
31
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