What this microSD connector does in the assembly
The Molex 5025700893 is a push-push microSD card connector from the 502570 series, designed to accept a Secure Digital - microSD™ card. It provides 10 positions, arranged as 8 data/ power contacts plus 2 dedicated switch contacts for card-detect switching. The push-push mechanism means you insert the card to seat it and push again to eject; no spring-loaded flip-out.
The switch contacts — what the 8+2 position count means
The 10 (8 + 2) position count is the key detail here. Eight contacts carry the standard microSD data and power lines. The extra two are a normally-open switch that closes when a card is fully inserted. That switch contact lets the host controller detect card presence without polling the data lines — useful for hot-swap or power-gating the card slot. If your design needs card-detect, this part has it built in; if you don't need the switch, the extra pins simply float.
That's a respectable thickness for a card-edge connector — enough to handle the repeated insertion and removal cycles a microSD slot sees in field use without exposing the base metal to oxidation. Gold flash at lower thicknesses can wear through after a few hundred cycles; 20.0µin gives a longer service window before contact resistance starts to climb. The connector uses a push-push insertion and removal method, which puts the wear on the card edge and the contact beams rather than a sliding latch.
Mounting and board layout considerations
This is a surface-mount, right-angle connector. The mounting feature is described as Normal, Standard - Top, which means the card sits above the PCB with the contacts on the top side — typical for a card slot on the edge of a board.