The ZW-09-20-T interconnect series from Samtec is a through-hole board stacker header with a 2.54mm pitch, commonly known as a 0.1-inch pitch. This series is designed for applications requiring robust, high-reliability connections between boards in a stack. If you're working on multi-board assemblies for industrial control panels, server racks, or similar systems, these headers are a go-to solution. They provide a reliable mechanical and electrical connection, which is crucial in environments where vibration or thermal cycling could affect other types of connectors.

One thing worth noting is the durability of these headers. The through-hole design ensures that the connection is secure and less prone to mechanical failure compared to surface-mount options. Engineers tend to reach for this when they need a connector that can handle frequent mating and unmating cycles without degradation. Another practical benefit is the ease of installation; the through-hole nature means you can use standard soldering techniques, making it a straightforward process even for complex multi-layer PCB assemblies.