What this connector is
The Amphenol 87901-404HLF is the 4-circuit member of the BERGSTIK II dual-row header series, designed for board-to-board stacking at 0.100" (2.54 mm) pitch. Male pin contacts in a square profile accept the matching BERGSTIK II receptacle; the push-pull fastening type provides retention without a locking latch — the header holds in the PCB during assembly and the receptacle clips over it on mating. Contacts are phosphor bronze with 100 µin (2.54 µm) of tin plating on both the mating face and the solder tail, and the housing is UL94 V-0 rated black nylon.
Where it is used
BERGSTIK II headers at this position count and pitch are a staple in industrial automation as board-to-board signal and low-level power interconnects — the 4-circuit count suits auxiliary signal paths, sensor node aggregation, or power rail taps in a stacked PCB assembly. The UL94 V-0 housing rating makes it acceptable for equipment that requires a minimum flammability classification at the interconnect layer. The unshrouded design is the right choice when the mated receptacle already carries its own polarizing ribs and the design does not need header-side keying. For applications requiring visual alignment before mating, the open header profile lets the assembler see the pin array.
Sourcing posture
Lifecycle status is Active per the manufacturer's record. No official successor or cross-reference has been published for this specific base product number. The BERGSTIK II series is a long-running Amphenol family, so a parametric or form-factor peer within the same series is the most direct path if sourcing risk is a concern — confirm the position count and row configuration match before substituting. Quoted to order against BOM quantity; confirm lead time and MOQ for the delivery schedule.