What this connector is and where it sits in the series
The Amphenol ICC 87900-156HLF is the 56-circuit member of the BERGSTIK II dual-row header series — a board-to-board pin header with square male contacts rated 5 A per circuit at 110 V. Through-hole solder tails accept a standard 0.100" grid pattern, and the push-pull mating interface pairs with the matching BERGSTIK II receptacle housing. Black UL94 V-0 housing, 30.0µin gold or Gold GXT plating on the mating interface, phosphor bronze contact material, and an unshrouded profile that relies on the socket housing for alignment. The insulation height matches the row spacing at 0.100" (2.54mm), meaning the header sits flush with the board surface at the same plane as the mating row pitch.
Sourcing and what to confirm before the BOM commits
The 87900-156HLF carries an Active lifecycle status. It is quoted to order against BOM quantity with no official successor on record — the 56-position count is specific enough that a parametric peer search across the series must be validated against the mating half before substitution. Confirm the receptacle housing that accepts this header — the BERGSTIK II family uses push-pull engagement, and the socket keying or polarisation detail on the mated pair is determined by the receptacle side, not the header. If the application requires polarisation or keyed orientation, the mating housing must carry that feature; the unshrouded header itself does not enforce alignment.