MOSFET stands for Metal Oxide Semiconductor Field Effect Transistor. While MOSFETs also have a parasitic Miller capacitance, it is much smaller than for comparable IGBTs, owing to differences in their construction. A negative turn-off bias is not usually required. However, in applications where high voltages and/or high currents are being switched, the same mechanisms that can produce spurious turn-on in an IGBT are at play in a MOSFET. Therefore, in high current and high voltage FET applications, a negative bias turn-off is sometimes used to avert the destructive consequences of such spurious switching.