What are SMP Connectors?

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- everything RF

Feb 19, 2019

Sub miniature push-on (SMP) Connectors are plug-in connectors for applications up to 40 GHz. These connectors are easy to connect and disconnect as they can be pushed against each other to make a connection and pulled apart to open the connection. They do not need to be screwed on like most other connectors. The amount of force that is required to connect or disconnect SMP connectors is known as detent. SMP connectors are available in three different detent systems - full, limited and smooth bore, with respective levels of engagement/disengagement forces. They are available in both push-on and snap-on mating styles.

These connectors can be used in a board-to-board system using a floating bullet, which provides a link between mated pairs compensating for both radial and axial misalignment.

Key Specifications of SMP Connectors:

  • Impedance: 50 Ohm
  • Frequency Range: DC to 40 GHz
  • Dielectric Withstanding Voltage: 500 Vrms at sea level
  • RF Leakage: 80 dB max. at 3 GHz, 65 dB max. at 26.5 GHz
  • Temperature Range: -65 to 165 Degrees Celcius
  • Durability: 
    • 100 cycles min. into a full detent shroud
    • 500 cycles min. into a limited detent shroud
    • 1000 cycles min, into a smooth bore shroud
  • Radial Misalignment: +/-0.25mm
  • Axial Misalignment: 0/+0.25mm (with fixed length adapters)
  • Mating Style: Push-on or Snap-on
  • Dimensions: The outer diameter of the interface is approx. 3.30 mm
  • Military Specification: Can be qualified for defense and space applications (MIL-SPEC: MIL-STD-348).

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