This 0.100\u2033 (2.54 mm) 3\u00d74 straight female header is a 12-pin, triple-row socket strip for making compact plug-in connections to standard 0.1\u2033 male pin headers. It\u2019s a handy choice when you need more contacts in a small area than a single- or dual-row header can provide, while still staying within the common 2.54 mm prototyping ecosystem.

Compatibility-wise, it mates with 2.54 mm pitch male headers/pins (including standard breakaway male headers and many module pin strips). It\u2019s designed for through-hole PCBs/perfboard and mounts straight (vertical). It won\u2019t suit 2.0 mm pitch systems, JST-style wire-to-board connectors, or boards laid out for single-row or 2\u00d7N headers unless the matching 3\u00d74 footprint is present.

Practical uses include custom button/LED matrices, compact interconnects between stacked PCBs, specialised sensor/module breakouts, and space-constrained prototypes where a longer 2\u00d76 header would clash with other components. Compared with single-row female headers, this offers higher density in a smaller edge length; compared with IDC box headers, it\u2019s simpler and lower-profile but doesn\u2019t provide keyed, ribbon-cable-friendly alignment.

Suggested complements: use with matching male pins (e.g. a breakaway header) and prototyping substrates like Perfboard or Breadboard (choose based on your project), plus solid-core hookup wire for jumpers.