The SIT14503Q series is a low dropout linear regulator (LDO) with ultra-low quiescent current and a wide input voltage range of 3V to 40V. SIT14503Q provides fixed output of 5V. In addition, the product family is available with fixed outputs of 2.5V, 3.3V and 15V, or adjustable outputs from 0.65V to 24V, providing load currents up to 300mA. The quiescent current of the SIT14503Q series is less than 1µA when disabled and less than 6µA at light loads. The power-good delay can be adjusted by external components, allowing the delay time to be configured to fit application-specific systems. It can be applied to the power management of automotive electronics, industrial control system and wide voltage battery power supply system.