What it is — series and type
The Amphenol FCI (Amphenol ICC) 87900-452HLF is the 52-circuit member of the BERGSTIK II series — a dual-row unshrouded male pin header built for board-to-board stacking at the industry-standard 0.100 inch (2.54 mm) pitch. With all 52 positions loaded and through-hole solder termination, it mounts directly to a PCB and mates with a matching dual-row receptacle. The 0.100 inch insulation height keeps the mated stack low-profile, and the push-pull fastening type holds the pair together without screw locks or latches — suited for fixed-board interconnects where access for mating is unimpeded.
Ratings that drive the fit decision
The 5 A per-circuit current rating at 110 V sits comfortably above typical signal-level duty, making this viable for low-power bus and power-distribution board-to-board links. Contact plating is 100.0 µin (2.54 µm) of tin on both the mating face and the solder post — a consistent grade that gives solid solderability and moderate mating-cycle life. Phosphor bronze body material carries the current path; the UL94 V-0 flammability rating confirms the housing will not propagate flame, which matters in enclosed equipment compartments. At 52 positions across two rows, this is a high-density member of the BERGSTIK II footprint — the board designer needs to confirm the routed trace count and check row spacing against the signal-group isolation plan. The square pin shape fits standard receptacles without modification.
Where it is used
Board-to-board headers in this pitch and density are common in industrial control cards, instrumentation front panels, and telecom line cards — anywhere a fixed PCB pair needs a separable, through-hole mounted interconnect with a low stack height. The unshrouded design means keying must come from the housing or panel alignment; in open-frame equipment the designer supplies polarization. The 110 V rating keeps it inside low-voltage signal and control territory — not a power-distribution connector at scale, but capable of carrying individual bus rails at the 5 A per-circuit ceiling.
What it mates with
The 87900-452HLF mates with a standard dual-row 52-position 0.100 inch pitch BERGSTIK II female receptacle — typically a friction-fit housing with bifurcated contacts. The push-pull fastening is a friction-lock header alone; for vibration-exposed applications a board-level strain-relief or secondary latch on the receptacle housing is needed. Confirm the receptacle's contact material and plating match the tin grade specified here — mixed plating (e.g., gold mating / tin post) on the receptacle changes the galvanic compatibility profile.