In a lab fixture or programming header that gets cycled weekly, the gold will outlast the tin post finish on the solder tail, which is 100.0 µinch tin. The tin tail is adequate for soldering; the gold mating face resists fretting corrosion from repeated insertions.
Through-Hole Mounting and Board Clearance
No shroud means the pins are exposed, so keep the area around the header clear of tall components that could snag wires.
Sourcing and Cross-Reference
If the 9-146280-0-06 is on allocation, 1376779-2 is a functional swap — same pitch, same current rating, same 3 A — provided the thinner gold is acceptable for your cycle life requirement.
Mating and Application
Typical use is board-to-board stacking or cable-to-board interconnect where the exposed pins are accessible for probing or programming.