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  • The L4940 series of three-terminal positive regulators is available in TO-220 and D²PAK packages and with several fixed output voltages, making it useful in a wide range of industrial and consumer applications. Thanks to their very low input/output voltage drop, these devices are particularly suitable for battery-powered equipment, reducing consumption and prolonging battery-life. Each type employs internal current limiting, anti-saturation circuit, thermal shutdown and safe area protection.

    Key Features

    • Precise 5, 8.5, 12 V outputs
    • Low dropout voltage (450 mV typ. at 1 A)
    • Very low quiescent current
    • Thermal shutdown
    • Short-circuit protection
    • Reverse polarity protection

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Related Applications

Smart Farming

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS0420
      1.5 A very low drop voltage regulator IC
      14.0
      1.07 MB
      PDF
      DS0420

      1.5 A very low drop voltage regulator IC

    • Description Version Size Action
      AN290
      Very low drop regulators enhance supply performance
      1.3
      529.03 KB
      PDF
      AN290

      Very low drop regulators enhance supply performance

Publications and Collaterals

    • Description Version Size Action
      Linear and Switching Voltage Regulators Selection Guide 3.0
      370.88 KB
      PDF

      Linear and Switching Voltage Regulators Selection Guide

    • Description Version Size Action
      Low-dropout (LDO) linear voltage regulators Quick Reference Guide 2.1
      1.78 MB
      PDF
      Power management for handheld and portable 2.0
      1.09 MB
      PDF

      Low-dropout (LDO) linear voltage regulators Quick Reference Guide

      Power management for handheld and portable

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L4940D2T12-TR
Active
D2PAK Industrial Ecopack2
L4940D2T5-TR
Active
D2PAK Industrial Ecopack2
L4940V5
Active
TO-220 Industrial Ecopack1
L4940V85
Active
TO-220 Industrial Ecopack1

L4940D2T12-TR

Package:

D2PAK

Material Declaration**:

Marketing Status

Active

Package

D2PAK

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4940D2T5-TR

Package:

D2PAK

Material Declaration**:

Marketing Status

Active

Package

D2PAK

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4940V5

Package:

TO-220

Material Declaration**:

PDF XML

Marketing Status

Active

Package

TO-220

Grade

Industrial

RoHS Compliance Grade

Ecopack1

L4940V85

Package:

TO-220

Material Declaration**:

Marketing Status

Active

Package

TO-220

Grade

Industrial

RoHS Compliance Grade

Ecopack1

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Package
Packing Type
Output Voltage (V) (nom)
Output Tolerance (typ)
Output Current (A) (nom)
Marketing Status
ECCN (US)
Country of Origin
Budgetary Price (US$)*/Qty
L4940V5 Available at 10 distributors

Distributor availability ofL4940V5

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4863 1 Order Now
COMPEL EUROPE 411 1 Order Now
RS COMPONENTS EUROPE 1020 1 Order Now
AVNET AMERICA 1370 0 Order Now
FUTURE WORLDWIDE 200 1 Order Now
ARROW EUROPE 5363 0 Order Now
ARROW AMERICA 2463 1000 Order Now
MOUSER WORLDWIDE 2078 1 Order Now
Farnell Element14 EUROPE 2552 1 Order Now
ANGLIA Live EUROPE 113 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

4863

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

411

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1020

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

1370

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

200

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

5363

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

2463

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

2078

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2552

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

113

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Buy now TO-220 Tube 5 2 1.5
Active
EAR99 CHINA 0.578 / 1k
L4940D2T12-TR Available at 8 distributors

Distributor availability ofL4940D2T12-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2026 1 Order Now
RS COMPONENTS EUROPE 735 1 Order Now
FUTURE WORLDWIDE 1000 1000 Order Now
ARROW EUROPE 1000 0 Order Now
Newark Element14 AMERICA 499 0 Order Now
ARROW AMERICA 5000 1000 Order Now
MOUSER WORLDWIDE 1449 1 Order Now
Farnell Element14 EUROPE 735 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

2026

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

735

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

1000

Min.Order

1000

Region

WORLDWIDE Order Now

ARROW

Stock

1000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

499

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

5000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

1449

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

735

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Buy now D2PAK Tape And Reel 12 2 1.5
Active
EAR99 CHINA 0.497 / 1k
L4940D2T5-TR Available at 7 distributors

Distributor availability ofL4940D2T5-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2676 1 Order Now
RS COMPONENTS EUROPE 2840 5 Order Now
FUTURE WORLDWIDE 915 1 Order Now
ARROW EUROPE 2000 0 Order Now
ARROW AMERICA 40000 1000 Order Now
MOUSER WORLDWIDE 3628 1 Order Now
Farnell Element14 EUROPE 1995 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

2676

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2840

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

915

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

2000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

40000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

3628

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1995

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Buy now D2PAK Tape And Reel 5 2 1.5
Active
EAR99 CHINA 0.497 / 1k
L4940V85 Available at 5 distributors

Distributor availability ofL4940V85

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1870 1 Order Now
COMPEL EUROPE 202 1 Order Now
RS COMPONENTS EUROPE 1095 5 Order Now
ARROW EUROPE 1940 0 Order Now
MOUSER WORLDWIDE 1847 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

1870

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

202

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1095

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

1940

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1847

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-09

Buy now TO-220 Tube 8.5 2 1.5
Active
EAR99 CHINA 0.578 / 1k

L4940V5

Package

TO-220

Packing Type

Tube

Budgetary Price (US$)*/Qty

0.578 / 1k

Distributor availability ofL4940V5

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4863 1 Order Now
COMPEL EUROPE 411 1 Order Now
RS COMPONENTS EUROPE 1020 1 Order Now
AVNET AMERICA 1370 0 Order Now
FUTURE WORLDWIDE 200 1 Order Now
ARROW EUROPE 5363 0 Order Now
ARROW AMERICA 2463 1000 Order Now
MOUSER WORLDWIDE 2078 1 Order Now
Farnell Element14 EUROPE 2552 1 Order Now
ANGLIA Live EUROPE 113 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

4863

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

411

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1020

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

1370

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

200

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

5363

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

2463

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

2078

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2552

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

113

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Output Voltage (V) (nom)

5

Output Tolerance (typ)

2

Output Current (A) (nom)

1.5

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.578 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

L4940D2T12-TR

Package

D2PAK

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.497 / 1k

Distributor availability ofL4940D2T12-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2026 1 Order Now
RS COMPONENTS EUROPE 735 1 Order Now
FUTURE WORLDWIDE 1000 1000 Order Now
ARROW EUROPE 1000 0 Order Now
Newark Element14 AMERICA 499 0 Order Now
ARROW AMERICA 5000 1000 Order Now
MOUSER WORLDWIDE 1449 1 Order Now
Farnell Element14 EUROPE 735 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

2026

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

735

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

1000

Min.Order

1000

Region

WORLDWIDE Order Now

ARROW

Stock

1000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

499

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

5000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

1449

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

735

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Output Voltage (V) (nom)

12

Output Tolerance (typ)

2

Output Current (A) (nom)

1.5

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.497 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

L4940D2T5-TR

Package

D2PAK

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.497 / 1k

Distributor availability ofL4940D2T5-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2676 1 Order Now
RS COMPONENTS EUROPE 2840 5 Order Now
FUTURE WORLDWIDE 915 1 Order Now
ARROW EUROPE 2000 0 Order Now
ARROW AMERICA 40000 1000 Order Now
MOUSER WORLDWIDE 3628 1 Order Now
Farnell Element14 EUROPE 1995 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

2676

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2840

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

915

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

2000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

40000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

3628

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1995

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Output Voltage (V) (nom)

5

Output Tolerance (typ)

2

Output Current (A) (nom)

1.5

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.497 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

L4940V85

Package

TO-220

Packing Type

Tube

Budgetary Price (US$)*/Qty

0.578 / 1k

Distributor availability ofL4940V85

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1870 1 Order Now
COMPEL EUROPE 202 1 Order Now
RS COMPONENTS EUROPE 1095 5 Order Now
ARROW EUROPE 1940 0 Order Now
MOUSER WORLDWIDE 1847 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

1870

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

202

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1095

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

1940

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1847

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-09

Output Voltage (V) (nom)

8.5

Output Tolerance (typ)

2

Output Current (A) (nom)

1.5

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.578 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors