Ever wondered why semiconductor wafers come in batches of exactly 25 – not 20, not 30? It all goes back to the early days of the industry, when engineers needed a batch size that was easy to handle, fit perfectly in standard carriers, and worked with early process equipment. 25 turned out to be the sweet spot: heavy enough to be efficient, light enough to carry, and statistically reliable for yield analysis. Today, even with 300mm wafers and fully automated fabs, that same 25‑wafer standard is still used worldwide. Curious to learn more? Check out the full story behind this industry norm!