LM3940IT-3.3/NOPB Part Information

Details for LM3940IT-3.3/NOPB by Texas Instruments

Semiconductors - ICs > Power Management ICs - PMIC > Voltage Regulators

Part 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.

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Part Features

  • Built-in Protection against Excess Temperature
  • Excellent Load Regulation
  • Input Voltage Range: 4.5 V to 5.5 V
  • Output Voltage Specified over Temperature
  • Requires only One External Component
  • Short-Circuit Protected
  • Specified 1-A Output Current

Part Specifications

Output Type Fixed
Input Voltage Min 0V
Input Voltage Max 7.5V
Fixed Output Voltage Nom. 3.3V
Adjustable Output Voltage Min -
Adjustable Output Voltage Max -
Output Current 1A
Dropout Voltage Vdo 500mV
LDO Regulator Case Style TO-220
No. of Pins 3Pins
Operating Temperature Min -40°C
Operating Temperature Max 125°C
Product Range 3.3V 1A LDO Voltage Regulators
Automotive Qualification Standard -
RoHS Phthalates Compliant Yes
MSL -
SVHC No SVHC (27-Jun-2018)
No. of Outputs 1Outputs
Operating Temperature Range -40°C to +125°C
Output Voltage Nom. 3.3V
Primary Input Voltage 5V
Supply Voltage Max 7.5V
Supply Voltage Min 4.5V
Termination Type Through Hole
Voltage Regulator Type LDO Fixed Positive
RoHS Compliant

Alternative Part Descriptions

  • 1A,3.3V,LDO Voltage Reg.,LM3940IT-3.3 | RS Components
  • IC, V REG, LINEAR, 3.3V; Output Type:Fixed; Input Voltage Min:0V; Input Voltage Max:7.5V; Fixed Output Voltage Nom.:3.3V; Adjustable Output Voltage Min:-; Adjustable Output Voltage Max:-; Output Current:1A; Dropout Voltage Vdo:500mV;RoHS Compliant: Yes | Newark Electronics
  • LDO Regulator Pos 3.3V 1A 3-Pin(3+Tab) TO-220 Rail | Avnet America
  • IC: voltage regulator; LDO,fixed; 3.3V; 1A; TO220-3; THT; -40÷125°C | Transfer Multisort Elektronik
  • LDO U-Reg +3,3V 1A TO220 | Schukat Electronic
  • 1-A, low-dropout voltage regulator for 5-V to 3.3-V conversion | Texas Instruments
  • LDO Voltage Regulator [Texas Instruments] LM3940IT-3.3/NOPB LDO Voltage Regulator | Distrelec

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