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

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: The SSMB-Nano connector is a small version of the standard SMB connector with a 'snap-on' coupling.