Custom SMB jack connector crimped to a 5 mm coaxial cable
Type RF coaxial connector
Production history
Designed 1960s
Manufacturer Various
Cable Coaxial
Passband Typically 0–4 GHz

SMB (SubMiniature version B) connectors are coaxial RF connectors developed in the 1960s. SMB connectors are smaller than SMA connectors.

They feature a snap-on coupling and are available in either 50 Ω or 75 Ω impedance. They offer excellent electrical performance from DC to 4 GHz.

An SMB jack has a male center pin, while an SMB plug has a female basket.[1][2]

Connectors are available for two SMB cable sizes:

  1. Cable 2.6/50+75 S (3 mm outer / 1.7 mm inner diameter) and
  2. Cable 2/50 S (2.2 mm outer / 1 mm inner diameter)


The SSMB-Nano connector is a small version of the standard SMB connector with a 'snap-on' coupling.[3][4]

  1. Impedance: 50 Ohm
  2. Operating frequency: DC–12.4 GHz

See also


  1. ^ Answer to a question about SMB connector genders
  2. ^ Image of SMB 50 Ω plug and jack illustrating the differences between the two genders
  3. ^ "SSMB-Nano" (PDF). Archived from the original (PDF) on 2011-01-24. Retrieved 2011-01-12.
  4. ^ "SSMB-Nano". 2007-07-24. Archived from the original on 2013-04-19. Retrieved 2011-01-12.