Current, Plating, and Temperature Range — What the Ratings Mean
The 4-103326-0-04: Rated 3A per contact, which is typical for a signal-level header at this pitch. The mating contact finish is gold, 15µinch thick over a copper alloy base. That thickness is enough for several hundred mating cycles in a clean environment — if this header lives inside a piece of equipment that gets reconnected a few times a year, the gold interface will outlast the product. The post finish is tin-lead, which wets well during wave soldering but is not RoHS-compliant for lead-free processes. The -65°C low end is unusual for a standard header — it means the thermoplastic housing and copper alloy pins will survive cold storage or outdoor cabinet exposure without cracking.