40-Position SMT Receptacle for Board-to-Board Stacking
The 20021321-00040D4LF: The 1.27 mm pitch and 1.27 mm row spacing set a compact footprint that routes two signals between the rows without a via layer change on a standard 4-layer PCB.
Position Count and Sourcing Options
Within the same 20021321 base number, the 40-position variant (this part) sits alongside 34-position and 36-position siblings. The closest functional peer is 20021321-00040T4LF, which is identical in every spec except the packaging suffix — the T4LF variant ships in a different tube format. For a BOM line, either works as a drop-in replacement if the packaging is compatible with your pick-and-place feeder.