Board-Stacking Interconnect: 0.50mm Pitch, 40 Positions
The Hirose DF12B-40DS-0.5V(86) is a 40-position, 2-row receptacle from the DF12 series, designed for board-to-board mezzanine stacking at 0.50mm pitch. At 0.50mm pitch, routing two traces between pads is tight; a 4-layer board with microvias is typical for this density class.
Lifecycle Status: Obsolete — Sourcing the DF12B-40DS-0.5V(86)
The DF12B-40DS-0.5V(86) is officially marked as Obsolete. There is no documented replacement or cross-reference from Hirose in the evidence. Do not assume a parametric substitute from the DF12 series will drop into the same footprint without checking the pinout and stacking height compatibility.
The two-row arrangement means 20 contacts per row, which keeps the connector body narrower than a single-row 40-position part would be.
Mated Stacking Heights and Board Spacing
The DF12B-40DS-0.5V(86) supports mated stacking heights of 3.5mm, 4mm, and 5mm. This means the same receptacle can be used in assemblies with different board-to-board gaps by selecting the appropriate mating header height. For a 3.5mm stack, the total z-height from the bottom of the receptacle PCB to the top of the mating header PCB is 3.5mm — tight enough for slim handheld devices or mezzanine cards in a compact enclosure.