SMP

Female Body

Male Body

Impedance

50 Ω

Maximum Operating Frequency

40.00 GHz

Interface Standards

SMP series are a high frequency push-on connector with its interfacing system featuring an inner female-to-female component, called a bullet or blindmate, and two outer panel, circuit or cable-mounted receptacles called shrouds. The design of the SMP bullet and shroud system allows for both axial and radial misalignment. SMP connector design is standardised by MIL-STD-348B, and can operate up to 40 GHz through select manufacturers.

In blind-mate applications, one shroud connector will be typically specified as a snap-on interface and the other as a slide-on. This ensures that the bullet adapter remains fixed in the same shroud connector when the connection is disengaged.

The two snap-on interfaces Full Detent (FD) and Limited Detent (LD) each have different engage and disengage coupling forces. The LD is typically selected as the snap-on interface in PCB mount or blind-mate applications, while the FD is mainly used for cabled connections where higher retention forces are required.

The two slide-on interfaces Smooth Bore (SB) and Catcher’s Mitt (CM) allow for reduced connection forces as compared to the snap-on versions. The push-on interface creates a sliding connection that does not physically locate the mating reference planes, allowing for axial and radial misalignment. Both the SB and CM have the same engage/disengage forces; however the CM is typically specified as the shroud configuration in blind-mate applications as its generous lead-in chamfer helps capture and guide the bullet into place.

SMP radial misalignment axial misalignment explained
Courtesy of Emerson

History

Originally marketed by the Gilbert company (now Corning Gilbert) during the 1980's under the trade name GPO, which signifies "Gilbert push-on". Subsequent versions of the connector include GPPO, G3PO, and G4PO, all of which are trademarks belonging to Corning.

Applications

SMP connectors are a popular choice for board-to-board applications, and typically found in microwave-band military and high grade commercial systems such as in phased arrays, airborne radar, active antennas, satellites, and a range of other radar systems.

Variations

A miniaturised variation capable of operating at higher frequencies is standardised under the Mini-SMP (SMPM) RF connector series.

Male Dimensions Female Dimensions
SMP male plug RF connector CAD drawing SMP female socket RF connector CAD drawing
Code SB Min (mm) SB Max (mm) LD Min (mm) LD Max (mm) FD Min (mm) FD Max (mm) Code Min (mm) Max (mm)
A Ø 0.36 0.41 0.36 0.41 0.36 0.41 A - -
B Ø 3.12 3.23 3.00 3.10 2.90 3.00 B - -
C Ø 3.53 3.68 3.53 3.68 3.53 3.68 C - 3.43
D Ø - - 3.15 3.20 3.15 3.20 D 0.00 nom.
E 2.74 2.84 2.74 2.84 2.74 2.84 E 0.20 nom.
F 1.14 1.40 1.14 1.40 1.14 1.40 F 2.84 -
G 0.84 0.94 0.84 0.94 0.84 0.94      
H - - 1.40 1.45 1.40 1.45      
I - - 1.98 2.08 1.98 2.08      
K - - 2.19 2.29 2.19 2.29