We use Cookies to give you best experience on our website. By using our website and services, you expressly agree to the placement of our performance, functionality and advertising cookies. Please see our Privacy Policy for more information.

Findchips Blog
Power Circuits / Linear Regulator ICs / LM3940ISX-3.3/NOPB
Datasheets
LM3940ISX-3.3/NOPB by:
Texas Instruments
Honest Han
National Semiconductor Corporation
Texas Instruments
Not Found

1-A, low-dropout voltage regulator for 5-V to 3.3-V conversion 3-DDPAK/TO-263 -40 to 125

Part Details for LM3940ISX-3.3/NOPB by Texas Instruments

Results Overview of LM3940ISX-3.3/NOPB by Texas Instruments

Tip: Data for a part may vary between manufacturers. You can filter for manufacturers on the top of the page next to the part image and part number.

Applications Industrial Automation Energy and Power Systems Renewable Energy

LM3940ISX-3.3/NOPB Information

LM3940ISX-3.3/NOPB by Texas Instruments is a Linear Regulator IC.
Linear Regulator ICs are under the broader part category of Power Circuits.

A power circuit delivers electricity in order to operate a load for an electronic device. Power circuits include transformers, generators and switches. Read more about Power Circuits on our Power Circuits part category page.

Available Datasheets

Part # Manufacturer Description Datasheet
DS96174CN/NOPB Rochester Electronics LLC DS96174 - Line Driver, 4 Func, 4 Driver, BIPolar, PDIP16
LM611IM/NOPB Rochester Electronics LLC LM611IM - Operational Amplifier, 7000uV Offset-Max, BIPolar

Price & Stock for LM3940ISX-3.3/NOPB

Part # Distributor Description Stock Price Buy
DISTI # LM3940ISX-3.3/NOPBCT-ND
DigiKey IC REG LINEAR 3.3V 1A TO263 Min Qty: 1 Lead time: 6 Weeks Container: Cut Tape (CT), Digi-Reel®, Tape & Reel (TR) 2202
In Stock
  • 1 $1.9100
  • 10 $1.4050
  • 25 $1.2796
  • 100 $1.1411
  • 250 $1.0750
  • 500 $1.0353
  • 1,000 $1.0025
  • 1,500 $0.9861
  • 2,500 $0.9680
  • 3,500 $0.9573
  • 5,000 $0.9471
$0.9471 / $1.9100 Buy Now
DISTI # 926-LM3940ISX3.3NOPB
Mouser Electronics LDO Voltage Regulators 1A LDO REG A 926-LM3940IS-3.3NOPB RoHS: Compliant 4262
  • 1 $1.9100
  • 10 $1.4100
  • 25 $1.2800
  • 100 $1.1500
  • 250 $1.0800
  • 500 $1.0300
  • 1,000 $0.9860
  • 2,500 $0.9540
  • 5,000 $0.9200
$0.9200 / $1.9100 Buy Now
DISTI # V72:2272_07275604
Arrow Electronics LDO Regulator Pos 3.3V 1A 4-Pin(3+Tab) DDPAK T/R Min Qty: 1 Package Multiple: 1 Lead time: 6 Weeks Date Code: 2423 Container: Cut Strips Americas - 31
  • 1 $1.8815
  • 10 $1.2597
  • 25 $0.8986
$0.8986 / $1.8815 Buy Now
DISTI # 86310490
Verical LDO Regulator Pos 3.3V 1A 4-Pin(3+Tab) DDPAK T/R Min Qty: 7 Package Multiple: 1 Date Code: 2423 Americas - 31
  • 7 $1.8815
  • 10 $1.2597
  • 25 $0.8986
$0.8986 / $1.8815 Buy Now
Quest Components 3.3V FIXED POSITIVE LDO REGULATOR, 1V DROPOUT, PSSO3 32
  • 1 $3.3200
  • 3 $2.4900
  • 11 $2.0750
$2.0750 / $3.3200 Buy Now
LCSC 1A Fixed 3.3V Positive electrode TO-263-3 Voltage Regulators - Linear Low Drop Out (LDO) Regulators ... ROHS more 68
  • 1 $1.8630
  • 10 $1.5732
  • 30 $1.3919
  • 100 $1.2059
  • 500 $1.1222
  • 1,000 $1.0865
$1.0865 / $1.8630 Buy Now
Vyrian Regulators 4689
RFQ
Win Source Electronics IC REG LDO 3.3V 1A DDPAK 10000
  • 20 $2.5440
  • 48 $2.0870
  • 75 $2.0220
  • 103 $1.9570
  • 133 $1.8920
  • 177 $1.6960
$1.6960 / $2.5440 Buy Now

Part Details for LM3940ISX-3.3/NOPB

LM3940ISX-3.3/NOPB CAD Models

  • Part Symbol

    Part Symbol

  • Footprint

    footprint

  • 3D Model

    3D Model

Available Download Formats

Sign in to download CAD models Register or Sign In

By downloading CAD models, you agree to our Terms & Conditions and Privacy Policy

LM3940ISX-3.3/NOPB Part Data Attributes

Parametric Data
LM3940ISX-3.3/NOPB Texas Instruments
Buy Now Datasheet
Compare Parts:
LM3940ISX-3.3/NOPB Texas Instruments 1-A, low-dropout voltage regulator for 5-V to 3.3-V conversion 3-DDPAK/TO-263 -40 to 125
Select a part to compare:
Pbfree Code Yes
Rohs Code No
Part Life Cycle Code Active
Ihs Manufacturer TEXAS INSTRUMENTS INC
Part Package Code D2PAK
Package Description ROHS COMPLIANT, TO-263, 3 PIN
Pin Count 4
Reach Compliance Code not_compliant
ECCN Code EAR99
HTS Code 8542.39.00.01
Samacsys Manufacturer Texas Instruments
Adjustability FIXED
Dropout Voltage1-Max 1 V
Dropout Voltage1-Nom 0.31 V
Input Voltage Absolute-Max 7.5 V
Input Voltage-Max 5.5 V
Input Voltage-Min 4.5 V
JESD-30 Code R-PSSO-G3
JESD-609 Code e3
Length 10.16 mm
Line Regulation-Max 0.04%
Load Regulation-Max 0.08%
Moisture Sensitivity Level 3
Number of Functions 1
Number of Outputs 1
Number of Terminals 3
Operating Temperature TJ-Max 125 °C
Operating Temperature TJ-Min -40 °C
Operating Temperature-Max 125 °C
Operating Temperature-Min -40 °C
Output Current1-Max 1 A
Output Voltage1-Max 3.47 V
Output Voltage1-Min 3.13 V
Output Voltage1-Nom 3.3 V
Package Body Material PLASTIC/EPOXY
Package Code TO-263
Package Equivalence Code SMSIP3H,.55TB
Package Shape RECTANGULAR
Package Style SMALL OUTLINE
Packing Method TR
Peak Reflow Temperature (Cel) 245
Qualification Status Not Qualified
Regulator Type FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
Seated Height-Max 4.83 mm
Surface Mount YES
Technology BIPOLAR
Terminal Finish Matte Tin (Sn)
Terminal Form GULL WING
Terminal Pitch 2.54 mm
Terminal Position SINGLE
Time@Peak Reflow Temperature-Max (s) 30
Voltage Tolerance-Max 5.2%
Width 8.635 mm

Alternate Parts for LM3940ISX-3.3/NOPB

This table gives cross-reference parts and alternative options found for LM3940ISX-3.3/NOPB. The Form Fit Function (FFF) tab will give you the options that are more likely to serve as direct pin-to-pin alternates or drop-in parts. The Functional Equivalents tab will give you options that are likely to match the same function of LM3940ISX-3.3/NOPB, but it may not fit your design. Always verify details of parts you are evaluating, as these parts are offered as suggestions for what you are looking for and are not guaranteed.

Part Number Manufacturer Composite Price Description Compare
LM3940ISX-3.3/NOPB National Semiconductor Corporation Check for Price IC VREG 3.3 V FIXED POSITIVE LDO REGULATOR, 1 V DROPOUT, PSSO3, ROHS COMPLIANT, TO-263, 3 PIN, Fixed Positive Single Output LDO Regulator LM3940ISX-3.3/NOPB vs LM3940ISX-3.3/NOPB
LM3940ISX-3.3 National Semiconductor Corporation Check for Price IC VREG 3.3 V FIXED POSITIVE LDO REGULATOR, 1 V DROPOUT, PSSO3, TO-263, 3 PIN, Fixed Positive Single Output LDO Regulator LM3940ISX-3.3/NOPB vs LM3940ISX-3.3
LM3940IS-3.3/NOPB National Semiconductor Corporation Check for Price IC VREG 3.3 V FIXED POSITIVE LDO REGULATOR, 1 V DROPOUT, PSSO3, ROHS COMPLIANT, TO-263, 3 PIN, Fixed Positive Single Output LDO Regulator LM3940ISX-3.3/NOPB vs LM3940IS-3.3/NOPB
LM3940IS-3.3 National Semiconductor Corporation Check for Price IC VREG 3.3 V FIXED POSITIVE LDO REGULATOR, 1 V DROPOUT, PSSO3, TO-263, 3 PIN, Fixed Positive Single Output LDO Regulator LM3940ISX-3.3/NOPB vs LM3940IS-3.3
Part Number Manufacturer Composite Price Description Compare
LM3940IS-3.3/NOPB Texas Instruments $0.5686 1-A, low-dropout voltage regulator for 5-V to 3.3-V conversion 3-DDPAK/TO-263 -40 to 125 LM3940ISX-3.3/NOPB vs LM3940IS-3.3/NOPB
LM3940IS-3.3 Texas Instruments Check for Price 1-A, low-dropout voltage regulator for 5-V to 3.3-V conversion 3-DDPAK/TO-263 -40 to 125 LM3940ISX-3.3/NOPB vs LM3940IS-3.3
LM3940ISX-3.3 Texas Instruments Check for Price 1-A, low-dropout voltage regulator for 5-V to 3.3-V conversion 3-DDPAK/TO-263 -40 to 125 LM3940ISX-3.3/NOPB vs LM3940ISX-3.3

LM3940ISX-3.3/NOPB Related Parts

LM3940ISX-3.3/NOPB Frequently Asked Questions (FAQ)

  • The maximum input voltage is 15V, but it's recommended to keep it below 12V for optimal performance and reliability.

  • To ensure stability, a minimum output capacitance of 10uF is recommended, and the ESR (Equivalent Series Resistance) should be less than 1 ohm.

  • The dropout voltage is typically around 1.5V, which means the input voltage should be at least 1.5V higher than the output voltage for proper regulation.

  • The device is rated for operation up to 125°C, but the junction temperature should be kept below 150°C to ensure reliability and prevent thermal shutdown.

  • Power dissipation can be calculated using the formula: Pd = (Vin - Vout) x Iout, where Vin is the input voltage, Vout is the output voltage, and Iout is the output current.