The AP0809ES3-r is a type of Reset Circuit manufactured by Chipown and is compliant with ROHS requirements. It is in a SOT23 package, which consists of a small, surface mountable chip with two rows of three metal leads. The AP0809ES3-r monitors the power supply to ensure that it is stable and that there are no sudden drops or spikes. In the event of such an issue, the reset circuit will reinitialize the power supply, ensuring its normal functioning. It also provides an adjustment range for controlling the reset threshold voltage and reset delay.