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光电隔离器（ＰＶＩ）为ＭＯＳＦＥＴ和ＩＧＢＴ提供隔离的栅极驱动。但是，在关断时，ＰＶＩ不能下拉栅极排放栅极电荷。采用一个可编程结晶体管（ＰＵＴ）就可提供很快的栅极下拉，在０．２μｓ内使栅极放电，排放掉高达５Ａ的电流。ＰＵＴ为一四层结构，很像可控硅整流器．
Opto-isolators (PVIs) provide isolated gate drive for MOSFETs and IGBTs. However, PVI can not pull down the gate discharge gate charge when turned off. Using a programmable junction transistor (PUT) provides a fast gate pull-down, discharging the gate in 0.2μs and discharging up to 5A. PUT is a four-layer structure, much like a thyristor.