The HT75xx-1 series is a set of three-terminal low power high voltage implemented in CMOS technology.The Holtek HT75xx‑1 series are three-terminal fixed-output low-dropout (LDO) linear voltage regulators designed for high-input-voltage and low-quiescent-current applications. They provide stable voltage output ranging from 2.1 V to 12 V with up to 100 mA output current. With low dropout voltage, high output accuracy, and built-in overcurrent and thermal protection, the HT75xx‑1 regulators are ideal for battery-powered devices, communication systems, portable electronics, and embedded circuits. Available in compact packages such as SOT23, SOT89, and TO‑92, these devices are suitable for space-constrained designs.