Different applications or products have different input voltage requirement. For example, a laptop adapter is normally 19 V, internet modem has 12 V, home phone sometimes use 9 V, and many handset such as iPhone uses 5 V. Choosing the right device for the appropriate input voltage is very critical. Any voltage spike can damage the MOSFET devices. Infineon offers Power MOSFET in different voltage levels to meet customers’ needs.