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Fixed 3.3 V LDO regulator

LM1117-3.3 Basic Circuit

Build a basic LM1117-3.3 circuit with labeled pins, component values and connection guidance.

Package view

LM1117-3.3 in a circuit

Physical lead positions, local capacitors and a visible load.

Front-view LM1117T-3.3: pin1 ground, pin2 output to a 33 ohm load, pin3 input from5V. Input and output each have10microfarad tantalum capacitors.
Front view, marking toward you. Every GND symbol is the same return. Capacitor ESR and voltage ratings must suit the application.

Connect it, step by step

Follow the component values and pin connections

Feed INPUT

Connect regulated 5 V to lead 3 and place the input bypass nearby.

Connect OUTPUT and GND

Lead 2 and the tab are output. Lead 1 is ground. Add the required output capacitor and common load return.

Check the load

The 33 Ω example load draws about 100 mA and dissipates 0.33 W. Confirm regulator temperature under the actual cooling conditions.

Component view