The 53517-0830: RoHS non-compliance means this part contains lead or other restricted substances above the exemption thresholds. If your assembly requires full RoHS conformance, this header will not pass incoming inspection.
2.50 mm Pitch Mini-Lock — Wire-to-Board Fit
The 2.50 mm spacing is common for signal-level interconnects in consumer and industrial equipment where a compact but serviceable wire-to-board interface is needed. The part ships in a Tray package, which is typical for machine-placed headers in volume assembly.