1 A per Contact, Gold Mating Finish — Signal-Level Duty with Field-Service Life
The 5103308-8: Tin on the solder tail keeps the board-side cost down where the connection is permanent.
The 4-1775099-7 is a 20-position, 2-row header on 0.165" (4.20 mm) pitch with a locking ramp fastening and tin mating finish rated 9 A per contact. The 5103308-8 carries 40 positions at 2.54 mm pitch with gold mating finish at 1 A — the choice comes down to circuit density versus per-contact current and vibration lock. The 4.20 mm pitch of the 4-1775099-7 routes wider traces; the 2.54 mm pitch of the 5103308-8 matches standard IDC cable pitch.