<br> ## MOSFET ---   ####Above are curves for typical signal-level MOSFETs and Bipolar Junction Transistors (BJT). [MOSFET structure and physics.]( http://www.onmyphd.com/?p=mosfet.transistor) [Fab inventory logic level n-MOSFET](https://www.digikey.com/products/en?keywords=%09RFD16N05LSM9ACT-ND) [Digikey 850V 66A .065 Ohm](https://www.digikey.com/product-detail/en/ixys/IXFX66N85X/IXFX66N85X-ND/6005400) ####Power MOSFETs vs BJTs. <li>High imput impedance. <li>Thermal stability. <li>Larger dissipation for a given current. ####Figures of merit for power MOSFETs Below saturation, FET Drain-to-source acts like a resistance R_ds approx. inversely prop. to V_g-V_th<br> Turn-on time needs to be short for power switching. Input capacitance is proportional to gate area, so:<br> Figure of merit is R_ds * Area.<br> --- ###Comparison at 1200V.  ###Comparison of five transistor types. ~600V Breakdown.  [BJT](https://www.digikey.com/products/en/discrete-semiconductor-products/transistors-bipolar-bjt-single/276?k=BJT&k=&pkeyword=BJT&FV=ffe00114%2Cmu15A%7C2101%2Cmu16A%7C2101%2Cmu17A%7C2101%2Cmu18A%7C2101%2Cmu20A%7C2101%2Cmu24A%7C2101%2Cmu400V%7C2103%2Cmu420V%7C2103%2Cmu425V%7C2103%2Cmu440V%7C2103%2Cmu450V%7C2103%2Cmu460V%7C2103%2Cmu465V%7C2103%2Cmu480V%7C2103%2Cmu500V%7C2103%2Cmu525V%7C2103%2Cmu550V%7C2103%2Cmu560V%7C2103%2Cmu600V%7C2103&quantity=0&ColumnSort=0&page=1&stock=1&pageSize=25 ) [SiMOSFET](https://www.digikey.com/product-detail/en/stmicroelectronics/STW28N65M2/497-15575-5-ND/5244948) [IGBT](https://www.digikey.com/product-detail/en/stmicroelectronics/STGW10M65DF2/497-16969-ND/6230162) [SiC MOSFET](https://www.digikey.com/products/en/discrete-semiconductor-products/transistors-fets-mosfets-single/278?k=SiC+MOSFET&k=&pkeyword=SiC+MOSFET&pv608=2862&FV=ffe00116%2Cmu650V%7C2068&quantity=0&ColumnSort=0&page=1&pageSize=25) [GaN MOSFET](https://www.digikey.com/product-detail/en/transphorm/TPH3208PS/TPH3208PS-ND/6193645 )