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.
Electrical Specifications
Electrical data
Impedance
SMB
SMC
50 ohm
50 ohm
Frequency range
0-4 GHz
0-10 GHz
Cable dielectric dimensions
0.87 mm [.034"]
1.3 + 0.04f
1.5 mm [.059"]
1.25 + 0.04f
1.3 + 0.04f
1000V
0.87 mm [.034"]
1.25 + 0.04f
1.4 + 0.06f
1.5 mm [.059"]
1.15 + 0.04f
1.25 + 0.04f
1000V
VSWR *f in GHz
Straight connector DC-1000 MHz
Right angle connector DC-1000 MHz 1.4 + 0.08f
Dielectric withstanding Voltage 50 Hz rms 750V
750V
Working voltage 50 Hz rms
Working voltage DC
250V
335V
250V
335V
350V
450V
350V
450V
Insulation resistance
1000 Megohms min
≤ 3 Megohms
≤ 0.5 Megohms
1000 Megohms min
≤ 3 Megohms
≤ 0.5 Megohms
.25 db max. at 4 GHz
.50 db max. at 4 GHz
Contact
Inner conductor
Resistance Outer conductor
Insertion loss Straight connectors
.30 db max. at 1.5 GHz
.60 db max. at 1.5 GHz
(db max.)
Right angle connectors
Material Specifications
Parts Name
Body, Metal parts
Contacts
Material
Finish
Brass per QQ-B-626
Brass per QQ-B-626
Nickel or gold per requirement
30 µ"Gold
Male
Female
Female Beryllium copper, Per QQ-C-530, 30 µ"Gold
heat treated per MIL-H-7199
Insulators
Gasket
PTFE
None
Silicone rubber
None
Crimp ferrules
Seamless copper tubing alloy
Nickel or gold per requirement
51
ETC [ ETC ]
