Selecting Appropriate Standoffs

The Samtec SEAM series connectors are available in multiple heights. The height of the mating connector you select helps determine the height of the standoffs you need.

To prevent over-insertion, the SEARAY connector design requires that standoffs never be less than the stack height. Because standard nominal tolerances might result in a standoff being shorter than the stack height, NI requires that you use standoffs that are 0.15 mm (0.006 in.) taller than the combined height of the J1 connector on the NI sbRIO device and the mating SEARAY connector. Therefore, to determine the required standoff height, you must add the heights of the mated connectors plus an additional 0.15 mm (0.006 in.). Refer to Samtec documentation for more information about SEARAY standoff requirements.

The following table provides an example standoff height calculation using a Samtec SEAM-40-03.0-S-06-2-A-K-TR mating connector.

Table 18. Example Connector Configuration and Calculated Standoff Height
Component Manufacturer, Part Number Height
J1 connector Samtec SEAF-40-06.5-S-06-2-A-K-TR 6.50 mm (0.256 in.)
Mating connector Samtec SEAM-40-03.0-S-06-2-A-K-TR 3.00 mm (0.118 in.)
Required additional standoff height — 0.15 mm (0.006 in.)
Total calculated standoff height — 9.65 mm (0.380 in.)