SMB/SMC/SMZ
Coaxial
Connectors
51
SMB/SMC/SMZ Coaxial Connectors
The Amphenol SMB/SMC subminiature coaxial connectors with 50 ohm impedance are for applica-
tions to 4 GHz (SMB) or 10 GHz (SMC). Generally less expensive than SMA, these connectors are
used primarily in applications for microwave telephone and other nondefense telecommunications
requirements.
SMB connectors feature quick connect/disconnect snap-on mating and operate to 4 GHz with low
reflection.
SMC connectors have #10-32UNF-threaded screw-on couplings and operate reliably to 10 GHz.
SMZ connectors are matched-impedance SMB connectors to be used with 75 ohm miniature coax
cables. The connectors are the same size as, and intermateable with, standard 50 ohm SMB
connectors.
Material Specifications
Parts Name
Body, Metal parts
Contacts
Male
Female
Insulators
Gasket
Crimp ferrules
Material
Brass per QQ-B-626
Female Beryllium copper, Per QQ-C-530,
heat treated per MIL-H-7199
PTFE
Silicone rubber
Seamless copper tubing alloy
Finish
Nickel or gold per requirement
30 "Gold
None
Nickel or gold per requirement
Electrical Specifications
Electrical data
Impedance
Frequency range
Cable dielectric dimensions
VSWR *f in GHz Straight connector DC-1000 MHz
Right angle connector DC-1000 MHz
Dielectric withstanding Voltage 50 Hz rms
Working voltage 50 Hz rms
Working voltage DC
Insulation resistance
Contact
Inner conductor
Resistance
Outer conductor
Insertion loss Straight connectors
(db max.)
Right angle connectors
SMB
50 ohm
0-4 GHz
0.87 mm [.034"]
1.5 mm [.059"]
1.3 + 0.04f
1.25 + 0.04f
1.4 + 0.08f
1.3 + 0.04f
750V
1000V
250V
335V
350V
450V
1000 Megohms min
≤ 3 Megohms
≤ 0.5 Megohms
.30 db max. at 1.5 GHz
.60 db max. at 1.5 GHz
SMC
50 ohm
0-10 GHz
0.87 mm [.034"]
1.5 mm [.059"]
1.25 + 0.04f
1.15 + 0.04f
1.4 + 0.06f
1.25 + 0.04f
750V
1000V
250V
335V
350V
450V
1000 Megohms min
≤ 3 Megohms
≤ 0.5 Megohms
.25 db max. at 4 GHz
.50 db max. at 4 GHz