Board Fit and Signal Routing
The 5-104178-5: At this pitch, trace escape between pads is tight — a two-layer board with 6-mil traces and 6-mil spacing works, but a four-layer board gives cleaner fan-out for the inner rows. This works for controlled harness assembly where the mating pair is never swapped.
Contact Interface and Cycle Life
No compatibility issue with lead-free or tin-lead solder processes.
Voltage and Temperature Envelope
Rated 30 VAC — this is a signal-level header, not a power interconnect. The limiting factor is the 1.27 mm pitch creepage distance, not the contact itself.
Application Fit
The 30 VAC rating and 1.27 mm pitch suit it for signal-level interconnects in control modules, sensor boards, and telecom line cards.