The Amphenol 79821-156HLF is a 56-position dual-row male header from the BERGSTIK® II series, the workhorse unshrouded pin strip family. It sits on a 0.100" (2.54 mm) pitch in both rows and between rows, matching the standard 0.100" grid that dominates legacy and new board-to-board designs. All 56 positions are loaded — no depopulated rows to track on the BOM. Rated 5 A per contact at 110 V, with the current limit set by the contact beam and housing thermal rise, not the pin cross-section. The mating finish is gold or Gold GXT™ at 30.0 µin (0.76 µm), a thickness that handles hundreds of mating cycles without exposing the phosphor bronze base metal. The push-pull fastening and unshrouded profile mean it relies on the mating receptacle's retention — no latch, no locking ramp. UL94 V-0 black housing. Through-hole solder termination with a 0.200" (5.08 mm) post length suits standard PCB thicknesses.
What the ratings mean for the board fit
The 0.100" pitch sets the PCB footprint and the mating receptacle's contact spacing. The 5 A per-contact rating is a continuous-current ceiling at room temperature. The 30.0 µin gold on the mating side supports reliable contact resistance over repeated insertions.