30F124 300V IGBT,
Prior to the development of IGBTs, power MOSFETs were used for power amplifier applications which require high input impedance and fast switching. However, at high voltages, the on-state resistance rapidly increases as the breakdown voltage increases. It is thus difficult to improve the conduction loss of power MOSFETs.
On the other hand, the IGBT structure consists of a pnp bipolar transistor and a collector contact made on the p+ layer. The IGBT has a low on-state voltage drop due to conductivity modulation.