What this header does in a board-to-wire harness
The B03B-XASK-1-A is a JST XA series single-row header with 3 positions on a 2.50mm pitch, designed for board-to-wire connections where a positive locking latch is needed to keep the mating housing seated under vibration. Rated 3 A per contact at 250 V, with tin-plated mating surfaces — suitable for moderate-cycle applications where cost per position matters more than gold-plating cycle life.
Sourcing and lifecycle status
RoHS non-compliant per the listed status — verify your assembly's exemption or waiver requirements before committing the line.
Mating and termination checklist
Terminates via press-fit and solder through-hole — the press-fit tails hold the header in place during wave solder, eliminating the need for secondary hold-down fixtures. Mates with JST XA series crimp receptacle housings using the matching crimp terminal. The locking ramp on the header engages the latch on the receptacle for a vibration-resistant mate. Mated stack height is 11.3 mm — confirm the board-to-wire clearance in your enclosure before committing the layout.