OTEKThe HE2021A33HPR is a linear voltage regulator (LDO) manufactured by HEERMICROTEK that has an output of 3.3V~3.3V. It has a maximum current rating of 200mA and a maximum dropout voltage of 400mV. It also has an input voltage rating of up to 35 volts and a noise reduction rating of 60dB@1kHz. In addition, this LDO has a very low quiescent current of 2uA, and is ROHS compliant. It is packaged in a SOT-89-3 form factor.