The Hirose DF12E(3.5)-50DP-0.5V(80) is a 50-position header from the DF12 series, designed for board-to-board mezzanine stacking. It uses a 0.50mm pitch and a 3.5mm mated stacking height, placing it in the compact, high-density end of the DF12 family.
At 0.50 mm pitch, every trace between pads runs through a narrow corridor. The 50 positions across two rows mean the footprint spans about 12.5 mm along the board edge — manageable, but the routing density forces a four-layer board if you need to escape all 50 signals without necking down trace widths. The 2.80 mm height above board plus the 3.5 mm mated stack height leaves roughly 0.7 mm clearance between the header body and the opposing board — tight enough that you should verify component keep-outs on the underside of the top board before committing the layout.
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This header is listed as Obsolete on the manufacturer's lifecycle record.