What This 40-Position Mezzanine Receptacle Does
Its 0.031" (0.80mm) pitch and dual-row layout pack 40 signal paths into a compact footprint — the board layout engineer needs to plan trace escape and via size around this pitch early, because 0.80 mm leaves tight real estate between pads for routing. The gold flash plating at 8.00µin (0.203µm) is sufficient for the moderate mating cycles of a fixed mezzanine stack, but it's not hard gold — if this connector sees frequent reconnection in a test or field-service scenario, the contact wear life is shorter than a 30µin or 50µin gold part. The SMT termination suits it for reflow assembly on a standard pick-and-place line, and the tube packaging is the typical delivery for this volume grade.
Stack Height Flexibility — One Receptacle, Four Gaps
That range covers common mezzanine z-height budgets from compact handheld gear (5mm) to boards with mid-height components on the underside (8mm). The same receptacle order code works across all four heights — you only change the plug part number to adjust the stack. For the board layout engineer, the 0.148" (3.75mm) height above board is the receptacle's own footprint height; the total stack is that plus the plug's height above its own board.