The TE Connectivity 5120521-2 is an 84-position receptacle from the Free Height (FH) IEEE 1386, PMC series, designed as the board-side half of a mezzanine interconnect. The 0.039" (1.00mm) pitch and dual-row layout pack 84 circuits into a compact footprint that matches the PMC form factor — the same pitch used across the FH series, so the board layout stays consistent whether you're at 64 or 84 positions.
Stack Height Options and Board Standoff
This receptacle supports three mated stacking heights — 8mm, 9mm, and 10mm — depending on which plug half you pair it with. The height above board is fixed at 0.212" (5.38mm) for the receptacle alone; the total stack height comes from the plug's height above its own board. That gives the board layout engineer a 2 mm window to tune the z-height budget without changing the receptacle footprint.
SMT Termination and Tape-and-Reel Packaging
Surface-mount termination means this receptacle feeds directly into a standard reflow line — no through-hole wave solder step. The 84 positions at 1.00 mm pitch require a tight footprint, but the board guide helps with placement accuracy during the reflow process.
Comparison with the Plug Mate 1-120532-2
The key difference: the plug carries 50.0µin (1.27µm) gold — thicker than the receptacle's 30.0µin — and its height above board is 0.250" (6.35mm) versus the receptacle's 0.212" (5.38mm). When mated, the total stack height depends on which plug variant you select; the 8mm, 9mm, and 10mm options in the receptacle's spec correspond to specific plug heights. The plug also includes a pick-and-place feature, which the receptacle lacks, and ships in a box rather than tape-and-reel. Both are active and RoHS compliant.