The 3-644457-3 is a 3-position single-row unshrouded header from the TE MTA-100 series, with a 0.100" (2.54mm) pitch and right-angle through-hole termination. The unshrouded design exposes the tin-plated square pins (0.260" mating length) for direct mating with MTA-100 IDC receptacles or crimp housings — common in board-to-cable/wire applications. Rated 250VAC and the current depends on the wire gauge used in the mating half; the UL94 V-0 thermoplastic housing handles -55°C to 105°C, suitable for general-purpose industrial and consumer electronics enclosures.
Board layout and routing fit
The 0.110" post length (2.79mm) and tin-plated solder tails (150.0µin thickness) are designed for wave-solder through-hole assembly; the 0.100" insulation height keeps the body low above the board.