LM3940 1-A Low-Dropout Regulator for 5-V to 3.3-V Conversion General Description The LM3940 is a 1-A low-dropout regulator designed to provide 3.3 V from a 5-V supply. The LM3940 is ideally suited for systems which contain both 5-V and 3.3-V logic, with prime power provided from a 5-V bus. Because the LM3940 is a true low dropout regulator, it can hold its 3.3-V output in regulation with input voltages as low as 4.5 V. The TO-220 package of the LM3940 means that in most applications the full 1 A of load current can be delivered without using an additional heatsink. The surface mount DDPAK/TO-263 package uses minimum board space, and gives excellent power dissipation capability when soldered to a copper plane on the PC board. Features - Input Voltage Range: 4.5 V to 5.5 V - Output Voltage Specified over Temperature - Excellent Load Regulation - Specified 1-A Output Current - Requires only One External Component - Built-in Protection against Excess Temperature - Short-Circuit Protected Applications - Laptop and Desktop Computers - Logic Systems https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2017-08-06 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2018-05-04 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2018-12-17 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2019-04-02 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2021-05-22 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2021-09-27 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2022-05-26 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2022-10-24 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2022-12-07 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2023-01-07 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2023-09-07 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2024-08-13 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2025-09-15 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2026-01-07 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2026-01-25 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2026-02-11 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2026-07-23 https://elecena.pl/product/9716601/lm3940it-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-to-220 2026-09-17