Traditionally, board-to-board RF connections have been achieved by using either two cable connectors or perhaps two board connectors with a third, spacer or bullet, between. Both of these options can add significant cost and assembly time. TE Connectivity’ new Compression Coax Board-to-Board Blindmate product eliminates the need for these multiple connectors – and their added cost – by offering a single connector assembly with spring-loaded contact. One side of the connector is soldered on the base circuit board surface and the other side mates directly on the opposite target board using applied spring pressure (see cross-section diagram below). This “one piece” design offers an easy connection with large radial and axial misalignment, and eliminates the risk of breaking soldered connections when mating or un-mating.
This product is initially available in three different lengths for board spacing of 6.65 mm, 10 mm and 14 mm, and is supplied in trays for easy pick and place compatibility. The connector has an operating temperature range of –40 to +125°C, impedance of 50 Ohms, and can operate effectively at frequencies up to 6 GHz. Return loss is specified as a minimum –20 dB at frequencies up to 2.2 GHz. Tolerance against axial misalignments from the nominal board stacking height is specified as ±1.0 mm for the 10 mm and 14 mm versions, and ±0.4 mm for the 6.65 mm version. Tolerance against radial misalignment is specified as ±0.8 mm from centerline, in any direction, for all three versions. The target pads, typically contacting a gold-plated PCB target, can be tin plated, or a gold-plated disc, also available from TE Connectivity, can be applied to the mating PCB for improved characteristics. Additional sizes can be developed to customer request.
With the launch of this single connector design, TE Connectivity offers customers the opportunity to achieve a high quality, low profile board-to-board connection with fewer piece parts and a lower applied cost than existing competitor’s solutions.