The Amphenol 79821-450HLF is a 50-position, dual-row unshrouded pin header from the BergStik® II series, built on the standard 0.100" (2.54 mm) pitch that matches legacy DIP footprints and perf-board grids. The UL94 V-0 black housing and through-hole solder tails suit it for production assemblies inside enclosed equipment where flame rating is a compliance requirement.
What the 5 A Rating Means for This Header
Tin-on-tin interfaces work well for a single mate or occasional reconnection in a low-vibration environment — the contact resistance stays stable through the first few cycles.
The 0.100" pitch and 0.100" row spacing place the 50 pins on a standard 0.100" x 0.100" grid — two rows of 25. The 0.200" (5.08 mm) post length gives enough tail for a typical 1.6 mm PCB with room for a solder fillet on the bottom side. The overall contact length of 0.730" (18.54 mm) and a mating pin length of 0.430" (10.92 mm) mean the header can stack with a standard receptacle without bottoming out in the housing cavity.
The square phosphor bronze pins (0.025" square cross-section) are the industry-standard geometry for BergStik-compatible receptacles. Termination is through-hole solder; no press-fit or surface-mount option on this variant.