The 1-2842139-0 is the 20-position member of TE Connectivity's AMPMODU header line, an unshrouded breakaway header for board-to-board stacking.
Position count and footprint across the series
Within the AMPMODU 2.00 mm pitch family, the 20-position 1-2842139-0 sits alongside other position counts — the pitch, row spacing, and unshrouded profile are shared, so the selection decision reduces to matching the circuit count to the board layout.
