The graphs shown here help differentiate between IGBTs within Infineon product offering. Starting with the graph in the upper left corner, this graph shows one important characteristic of IGBT technology: conduction performance can be traded-off against switching performance. This is why the same basic device is available with different speed ratings. As shown in the graph, an IGBT with low conduction drop would have high switching losses and vice-versa. The second graph shows how the current versus frequency curve helps the designer select the speed rating of the IGBT, depending on the operating frequency. If the design operates below 1.5 kHz, the standard will probably be better. If the design operates between 1.5 and 7 kHz, fast device will be more suitable. Above that is the ultra fast and the warp speed IGBTs. The last graph shows another important consideration in selecting an IGBT: short circuit rating implies higher conduction losses. If a short circuit rating is desired in an application, then the designer has to be prepared to pay a price in terms of voltage drop. A short circuit rating of 10 µs adds approximately 500 mV to the voltage drop. If it drops to 5 µs, the increase in voltage drop is somewhat less severe.