The 79821-444HLF is a 44-position, dual-row unshrouded header from the FCI Amphenol BERGSTIK® II series. It uses a 0.100" (2.54 mm) pitch on both rows and contacts, which is the standard breadboard spacing. The square male pins are phosphor bronze with a 100.0 µin (2.54 µm) tin finish on the mating surface and tin on the solder tails. The unshrouded, push-pull design means no polarization key — orientation is set by the board layout. The UL94 V-0 black insulator handles the flame rating required inside most equipment enclosures.
Within the BERGSTIK® II family, the 44-position 79821-444HLF sits above the more common 10- and 20-position variants. The 100.0 µin tin mating finish is standard for this series — it handles moderate mating cycles well, but if your application requires frequent field reconnects (over 50 cycles), a gold-plated sibling from the same series would be a better fit.
This is an unshrouded male header — it mates with any standard 0.100" pitch dual-row female socket or IDC receptacle that accepts 0.025" square pins. The overall contact length of 0.730" (18.54 mm) breaks down into a 0.430" (10.92 mm) mating length and a 0.200" (5.08 mm) solder tail for through-hole PCB mounting. The 0.100" (2.54 mm) insulation height above the board leaves room for trace routing under the header body.