MCP1824ST-3302E/DB

Product Overview

The Microchip Technology MCP1824ST-3302E/DB is a single-output linear voltage regulator that provides a fixed positive 3.3V supply at up to 300mA. It operates from input voltages up to 6V and has a maximum dropout voltage of 0.32V at 300mA for surface-mount power rails that require a regulated 3.3V output from a higher-voltage source. The SOT-223-3 device package is associated with the TO-261-4/TO-261AA case, and the rated operating temperature range is -40°C to 125°C. Quiescent current is 220 µA, and power-supply rejection is 55dB at 100Hz. Built-in protection includes over-temperature, short-circuit, and under-voltage lockout.

Key Features

• Fixed positive 3.3V output from a single regulator channel.
• Rated output current of 300mA.
• Maximum input voltage of 6V.
• Maximum dropout voltage of 0.32V at 300mA.
• Quiescent current of 220 µA.
• PSRR of 55dB at 100Hz.
• Protection against over-temperature, short circuit, and under-voltage lockout.
• Operating temperature range of -40°C to 125°C.
• Surface-mount SOT-223-3 package, TO-261-4/TO-261AA.

Applications

• Regulating a 5V or other input up to 6V to a fixed 3.3V rail for microcontrollers, sensors, and digital logic on embedded boards.
• Supplying low-to-moderate current 3.3V loads in surface-mount power sections where dropout margin and package size are design constraints.
• Providing a protected 3.3V auxiliary rail in equipment that benefits from over-temperature, short-circuit, and UVLO behavior.

Design & Procurement Notes

For design and selection consideration, verify that the available input voltage remains at or below 6V and that the minimum headroom above 3.3V is sufficient for the required load current, especially near 300mA where dropout is 0.32V maximum. The 220 µA quiescent current should be included in low-power budget calculations when the regulator remains enabled. The 55dB PSRR at 100Hz indicates sensitivity to low-frequency input ripple and may require input filtering in noisy systems. The SOT-223-3 surface-mount package and TO-261-4/TO-261AA case should be checked against board layout and thermal relief needs, while the -40°C to 125°C operating range supports wide-temperature board environments. Protection features (over-temperature, short-circuit, and UVLO) should be integrated into system-level fault response rather than treated as a substitute for input/output conditioning.