SMB
SMB Connectors
Description
The SMB name derives from SubMiniature B (the second subminiature design). Developed
in the 1960’s, this sub miniature interface has snap-on coupling. Amphenol’s SMB connectors
conform to the requirements of MIL-C-39012, and the interface is in compliance with MIL-STD-
348. Available in 50 Ω and 75 Ω, the SMB provides broadband capability through 10 GHz with
a snap-on connector design and utilizes die cast components on non-critical areas to provide a
low-cost solution.
Amphenol RF
®
36
Features/Benefits
• Broadband performance with low reflection DC to 4 GHz provides low cost
connector combined with high quality.
• Quick connect/disconnect snap-on mating reduces installation time.
• Various plating options in nickel, gold, and tin. Selective plating
provides corrosion resistance finish as well as good solderability
characteristics.
• SMB PCB slide-on plug and jack allows board-to-board mounting with a low
insertion force. This is ideal for mating a high number of connectors on a
pair of PCB’s.
Applications
• Automotive
• Base Stations
• Cable Assemblies
• Components
• Instrumentation
• PC/LAN
• Process Controls
• Radio Boards
• Surge Protection
• Telecom
• Test and Measurement
• Video Systems
SMB
Amphenol
®
RF:
800-627-7100
SMB
50 Ω SMB Specifications
Electrical
Impedance
Frequency range
VSWR
50 Ω
DC - 4 GHz (usable to 10 GHz)
1.2 max. @ DC - 4 GHz
1.5 max. @ 4 - 10 GHz
55 dB minimum @ 1 GHz (flexible cable)
≥ 250 Vrms (depending on cable)
center contact: ≤ 6 mΩ
outer contact: ≤ 2.5 mΩ
braid to body: ≤ 1 mΩ
5,000 MΩ minimum
0.3 dB @ 1.5 GHz
1,000 Vrms (at sea level)
Snap-on coupling (MIL-STD-348)
Hex crimp
Solder
All, unless noted otherwise
≤ 14.2 lbs (63N)
≥ 1.8 lbs (8N)
500 cycles minimum
-65°C to +165°C
MIL-STD-202, method 107, cond. B
MIL-STD-202, method 106
MIL-STD-202, method 101, cond. B
MIL-STD-202, method 204, cond. D
MIL-STD-202, method 213, cond. B
RF-leakage
Voltage rating (at sea level)
Contact resistance
Insulation resistance
Insertion loss maximum
Dielectric withstanding voltage
Mechanical
Mating
Braid/Jacket cable affixment
Center conductor cable affixment
Captivated contacts
Engagement force
Disengagement force
Durability (matings)
Environmental
Temperature range
Thermal shock
Moisture resistance
Corrosion
Vibration
Mechanical shock
Amphenol
®
RF:
800-627-7100
SMB
37
SMB
50 Ω SMB Specifications (continued)
Material
Body and outer contacts
Male contact
Female contact
Crimp ferrule
Insulator
Military
MIL-C-22557A
Plug
.141 MIN
.141 MIN
.117
MIN
REF PLANE
Body: brass or zinc alloy (ASTM-B86-71), gold or nickel plated
Brass, gold plated
Beryllium copper or phosphor bronze, gold plated
Copper or brass, nickel or gold plated
PTFE
where applicable
Jack
.141/.131
.117
MAX
REF PLANE
.065
MIN
.010
MAX
.007
MAX
ø.146 MAX
ø.081 MAX
ø.082 MIN
ø.021/.019
.007/.037
.007 MIN
C
L
.000 MIN
.010 MIN
.064 MAX
.052
MIN
38
SMB
Amphenol
®
RF:
800-627-7100
SMB
75 Ω SMB Specifications
Electrical
Impedance
Frequency range
VSWR
RF-leakage
Voltage rating (at sea level)
Contact resistance
75 Ω
DC - 4 GHz
1.4 max. @ DC - 4 GHz
55 dB minimum @ 1 GHz (flexible cable)
≥ 250 Vrms (depending on cable)
center contact: ≤ 6 mΩ
outer contact: ≤ 1 mΩ
braid to body: ≤ 1 mΩ
5,000 MΩ minimum
0.3 dB @ 1.5 GHz
1,000 Vrms (at sea level)
Snap-on coupling (MIL-STD-348)
Hex crimp
Solder
All, unless noted otherwise
≤ 14.2 lbs (63N)
≥ 1.8 lbs (8N)
500 cycles minimum
-65°C to +165°C
MIL-STD-202, method 107, cond. B
MIL-STD-202, method 106
MIL-STD-202, method 101, cond. B
MIL-STD-202, method 204, cond. D
MIL-STD-202, method 213, cond. B
Insulation resistance
Insertion loss maximum
Dielectric withstanding voltage
Mechanical
Mating
Braid/Jacket cable affixment
Center conductor cable affixment
Captivated contacts
Engagement force
Disengagement force
Durability (matings)
Environmental
Temperature range
Thermal shock
Moisture resistance
Corrosion
Vibration
Mechanical shock
Amphenol
®
RF:
800-627-7100
SMB
39
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