The Amphenol 91276-427HLF is a 27-position single-row unshrouded header from the BERGSTIK® II series, on the standard 0.100" (2.54 mm) pitch. It carries tin-plated phosphor bronze square pins rated 5 A per circuit at 110 V, with a full 0.900" (22.86 mm) mating length. The through-hole solder termination and UL94 V-0 black insulation make it a straightforward, cost-effective board-to-board interconnect for signal and moderate power duty.
What the ratings mean for your board
The 0.100" (2.54 mm) pitch is a standard footprint — it matches legacy 0.100" grid layouts and leaves enough room for a single trace between pads on a typical 1 oz copper board. The 5 A per circuit rating is conservative for the contact size; the real limit is the temperature rise in the housing, so derate if the board runs hot or if multiple adjacent pins carry full current. Tin plating on both the mating and post surfaces keeps the cost low, but limits the mating cycle count — expect a few dozen insertions before the tin wipes thin; for frequent reconnects, a gold-plated variant in the same series would be a better fit.
Sourcing and lifecycle
This part carries an Active lifecycle status from Amphenol — no end-of-life notice, no last-time-buy pressure. No official cross-reference or direct replacement is documented.