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Focus RET Applications I

Nexperia RETs are used in many automotive and industrial applications. They provide a simple way to switch and drive loads directly from logic devices. In configuration 1 here, the NPN RET serves as a low-side switch; the resistive load or LED, or an inductive load which is connected directly to the battery can be switched. The important point is that the voltage swing of the logic device such as a microcontroller is good enough to switch the RET. In configuration 2, the NPN RET is now used as a high-side switch which is in the control path, and it is driving a PNP RET with the load switched directly by the logic input such as a microcontroller. In conventional piston-driven cars, the battery voltage can be 12 V but could also be as high as 24 V or 25 V in trucks and even 48 V in mild hybrid cars. The 80 V RETs allow the necessary ruggedness and create more headroom in order to switch the load in the voltage board net compared to using 40 V or 50 V RETs.

PTM Published on: 2021-07-13