The AP2138N-2.5TRG1 is an LDO regulator, manufactured by Diodes Incorporated, with a voltage rating of 2.5V, a current rating of 0.25A, and a three-pin SOT-23 T/R package. It offers a low dropout voltage and a high current output capability, and is designed to be used in portable applications requiring space saving components. The device has low operating current, high efficiency, and wide input voltage. It features a quasi-resonant topology, which provides a minimum possible standby current and low noise operation. The low-ESR output capacitor option is also available, making it suitable for high power applications.