When a part goes out of stock, the fastest way to blow up a schedule is to “close enough” your way into the wrong footprint. In this video I walk through how I actually select a replacement/alternate component for a PCB when the original part is no longer available—especially connectors, where people love to recommend something that looks similar but quietly changes pin/pad count. I show a real example where a forum suggestion had six pins instead of four. Could you hack it? Maybe. But I’m not signing up for assembly surprises. My workflow is simple and industry-friendly: start from the original MPN, search on Digi-Key (my preferred) or Octopart, then use the distributor’s detailed description to fan out into near-identical options. The “secret” fast check is pulling the 3D model and dropping it onto the existing PCB footprint. That immediately exposes mechanical gotchas (like little notches that intrude into the board) even when pad stacks look perfect. Then I validate dimensions against the datasheet/manufacturer site because 3D models aren’t always gospel. Once I’m in the ballpark, I document the alternate in the BOM (and ideally use a BOM management tool with real-time part data) so purchasing can move without risking a wrong-footprint build.