The NP4271AC501AE2P from Nisshinbo Micro Devices is an Automotive Qualified BiCMOS Low Dropout Regulator that is ideal for automotive electronic control units (ECUs) and industrial equipment applications. It requires an input voltage of 4 - 40 V. This regulator provides an output voltage of 5 V and has a drop-out voltage of up to 1 V. It is manufactured based on the BiCMOS process. This regulator integrates the watchdog timer and reset functions, and the watchdog time is set by an external capacitor. This regulator features a window detection mechanism that allows for precise detection of both high-side and low-side voltage levels. It also supports advanced protection features such as fast transient response, under-voltage lockout, thermal shutdown, and over-current protection. This AEC-Q100 Grade 1-qualified regulator is available in a surface-mount package that measures 5.2 x 6.2 x 1.5 mm.