The MT83121NSBR is a DC-DC converter that is manufactured by M3Tek. It is a SOT23-5L type, and meets RoHS compliance standards. This part is a low voltage DC-DC buck converter. It is a synchronous PWM step-down converter with an output current up to 500 mA and an output voltage from 0.8V to 5.5V. It features constant-frequency operation and wide input voltage range. It is compliant with MSL1 rating and has low EMI noise. It also has over-current, over-voltage, and thermal protection features. This part is suitable for powering applications such as hand-held mobile products, digital still cameras, sensors, home appliances, and automotive applications.