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/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2017-08-06 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2018-05-04 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2018-12-17 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2019-04-02 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2021-05-16 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2021-10-26 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2021-11-22 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2022-05-30 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2022-08-22 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2022-09-15 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2023-12-04 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2024-04-20 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2025-01-23 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2025-10-09 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2025-12-12 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2026-01-16 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2026-06-29 https://elecena.pl/product/9716599/lm3940imp-3-3-nopb-ldo-voltage-regulator-fixed-3-3-vout-1-a-sot-223 2026-09-15