Because the purpose of iCoupler products is to isolate an input from an output, the circuitry on one side of the transformers must be contained on a separate chip from the circuitry on the second side of the transformers. The transformers themselves can be placed on either chip—or on a third chip, as in the ADuM140x1 shown in Figure 4. The entire chipset is assembled within a standard plastic package similar to that used for a wide variety of semiconductor devices.