0.6mm Stack — No Room for Guesswork
The Molex 5050704020 is a 40-position plug from the SlimStack 505070 series, built for board-to-board mezzanine connections where the mated stack height is exactly 0.6mm — not 0.5mm, not 0.8mm. The outer shroud contacts are gold-plated, which tells you this is a signal-duty part — not a power rail.
40 Circuits at 0.35mm — Routing Budget First
Each row gives you 20 contacts, and the 0.35mm centerline means trace widths and via pads need to fit within that pitch — typically 0.15mm to 0.18mm traces with 0.25mm vias. The 0.019" (0.48mm) height above board is low enough that no components can sit under the connector body, so plan the keep-out zone accordingly.