The SCHROFF 60827026 voltage keying/coding pin is a crucial component for PMC mezzanine boards. It serves to prevent accidental damage during insertion and ensures correct voltage operation by distinguishing between 3.3V and 5V systems. The pin is bolted to VMEbus boards and requires a corresponding hole in the mezzanine board. This feature is particularly important for double-height euroboards, which require two pins for proper functionality. It is exclusively sold in Standard Pack Quantities (SPQ) of 10.