The Amphenol 79821-146HLF is the 46-position dual-row member of the BERGSTIK II unshrouded header series, designed for board-to-board signal and low-power interconnects at 0.100 inch (2.54 mm) pitch. Through-hole solder termination anchors it to the PCB; push-pull mating relies on the receptacle's lead-in geometry rather than a locking clip. Gold-plated contacts at 30 µin (0.76 µm) over phosphor bronze give the wipe durability needed for production-level mating cycles without the lifecycle penalty of tin-only finishes.
What the ratings mean for the fit
46 positions across two rows at 0.100 inch pitch is the key BOM match — confirm the receptacle carries the same position count and row spacing. The 5 A per-contact current rating handles low-level power distribution and signal rails; the 110 V rating is adequate for logic-level and control circuitry but sits well below what a power-distribution header would demand. Contact length of 0.430 inch (10.92 mm) on the mating side sets the engagement depth; the post extends 0.200 inch (5.08 mm) below the board surface — verify your paste mask and hole size for the through-hole lead-in. Insulation height of 0.100 inch (2.54 mm) governs the standoff when the board is populated, so check that the mated pair sits at the right z-height for the enclosure. The dual-row unshrouded layout maximises routing density but offers no polarisation of its own — the mating receptacle must provide the keying. All 46 positions are loaded, so there are no empty positions to account for in the footprint.
Typical applications and environments
BERGSTIK II unshrouded headers at this pitch are common in industrial automation backplanes, instrumentation front panels, and embedded-compute modules where the board-to-board connection is permanent or low-cycle. The UL94 V-0 housing material meets the minimum flammability requirement for enclosed equipment. The push-pull fastening style works well in stable panel environments — high-vibration applications may need a separate board-locking feature to supplement the friction fit.