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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
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Output Voltage (V) (nom)
Budgetary Price (US$)*/Qty
More info
min
max
L4940V5 Available at 11 distributors

Distributor availability ofL4940V5

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4377 1 Order Now
COMPEL EUROPE 389 1 Order Now
RS COMPONENTS EUROPE 935 1 Order Now
AVNET AMERICA 370 0 Order Now
FUTURE WORLDWIDE 100 1 Order Now
ARROW EUROPE 8263 0 Order Now
ARROW AMERICA 2316 1000 Order Now
MOUSER WORLDWIDE 3575 1 Order Now
Farnell Element14 EUROPE 3084 1 Order Now
ANGLIA Live EUROPE 87 1 Order Now
RUTRONIK EUROPE 1000 50 Order Now

Distributor reported inventory date: 2020-08-13

Distributor Name

DIGIKEY

Stock

4377

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

389

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

935

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

370

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

100

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

8263

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

2316

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

3575

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3084

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

87

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

1000

Min.Order

50

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-13

Buy now
Active
EAR99 NEC Tube TO-220 -40 150 5 0.578 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

1.5

Unit Price (US$):

0.578

Country of Origin:

CHINA

L4940D2T12-TR Available at 7 distributors

Distributor availability ofL4940D2T12-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2024 1 Order Now
RS COMPONENTS EUROPE 720 1 Order Now
ARROW EUROPE 1000 0 Order Now
Newark Element14 AMERICA 499 0 Order Now
ARROW AMERICA 5000 1000 Order Now
MOUSER WORLDWIDE 1049 1 Order Now
Farnell Element14 EUROPE 735 1 Order Now

Distributor reported inventory date: 2020-08-13

Distributor Name

DIGIKEY

Stock

2024

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

720

Min.Order

1

Region

EUROPE 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

1049

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

735

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-13

Buy now
Active
EAR99 NEC Tape And Reel D2PAK -40 150 12 0.497 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

1.5

Unit Price (US$):

0.497

Country of Origin:

CHINA

L4940D2T5-TR Available at 7 distributors

Distributor availability ofL4940D2T5-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2456 1 Order Now
RS COMPONENTS EUROPE 2815 5 Order Now
FUTURE WORLDWIDE 915 1 Order Now
ARROW EUROPE 1000 0 Order Now
ARROW AMERICA 40000 1000 Order Now
MOUSER WORLDWIDE 3525 1 Order Now
Farnell Element14 EUROPE 1932 1 Order Now

Distributor reported inventory date: 2020-08-13

Distributor Name

DIGIKEY

Stock

2456

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2815

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

915

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

1000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

40000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

3525

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1932

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-13

Buy now
Active
EAR99 NEC Tape And Reel D2PAK -40 150 5 0.497 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

1.5

Unit Price (US$):

0.497

Country of Origin:

CHINA

L4940V85 Available at 5 distributors

Distributor availability ofL4940V85

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1865 1 Order Now
COMPEL EUROPE 202 1 Order Now
RS COMPONENTS EUROPE 1090 5 Order Now
ARROW EUROPE 1940 0 Order Now
MOUSER WORLDWIDE 1845 1 Order Now

Distributor reported inventory date: 2020-08-13

Distributor Name

DIGIKEY

Stock

1865

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

202

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1090

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

1940

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1845

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-13

Buy now
Active
EAR99 NEC Tube TO-220 -40 150 8.5 0.578 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

1.5

Unit Price (US$):

0.578

Country of Origin:

CHINA

L4940V5

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.578 / 1k

Distributor availability ofL4940V5

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4377 1 Order Now
COMPEL EUROPE 389 1 Order Now
RS COMPONENTS EUROPE 935 1 Order Now
AVNET AMERICA 370 0 Order Now
FUTURE WORLDWIDE 100 1 Order Now
ARROW EUROPE 8263 0 Order Now
ARROW AMERICA 2316 1000 Order Now
MOUSER WORLDWIDE 3575 1 Order Now
Farnell Element14 EUROPE 3084 1 Order Now
ANGLIA Live EUROPE 87 1 Order Now
RUTRONIK EUROPE 1000 50 Order Now

Distributor reported inventory date: 2020-08-13

Distributor Name

DIGIKEY

Stock

4377

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

389

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

935

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

370

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

100

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

8263

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

2316

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

3575

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3084

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

87

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

1000

Min.Order

50

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-13

ECCN (EU)

NEC

Packing Type

Tube

Package

TO-220

Operating Temperature (°C)

(min)

-40

(max)

150

Output Voltage (V) (nom)

5

Output Tolerance (typ)

2

Output Current (A) (nom)

1.5

Budgetary Price (US$)* / Qty

0.578 / 1k

Country of Origin

CHINA

L4940D2T12-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.497 / 1k

Distributor availability ofL4940D2T12-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2024 1 Order Now
RS COMPONENTS EUROPE 720 1 Order Now
ARROW EUROPE 1000 0 Order Now
Newark Element14 AMERICA 499 0 Order Now
ARROW AMERICA 5000 1000 Order Now
MOUSER WORLDWIDE 1049 1 Order Now
Farnell Element14 EUROPE 735 1 Order Now

Distributor reported inventory date: 2020-08-13

Distributor Name

DIGIKEY

Stock

2024

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

720

Min.Order

1

Region

EUROPE 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

1049

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

735

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-13

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

D2PAK

Operating Temperature (°C)

(min)

-40

(max)

150

Output Voltage (V) (nom)

12

Output Tolerance (typ)

2

Output Current (A) (nom)

1.5

Budgetary Price (US$)* / Qty

0.497 / 1k

Country of Origin

CHINA

L4940D2T5-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.497 / 1k

Distributor availability ofL4940D2T5-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2456 1 Order Now
RS COMPONENTS EUROPE 2815 5 Order Now
FUTURE WORLDWIDE 915 1 Order Now
ARROW EUROPE 1000 0 Order Now
ARROW AMERICA 40000 1000 Order Now
MOUSER WORLDWIDE 3525 1 Order Now
Farnell Element14 EUROPE 1932 1 Order Now

Distributor reported inventory date: 2020-08-13

Distributor Name

DIGIKEY

Stock

2456

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2815

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

915

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

1000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

40000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

3525

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1932

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-13

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

D2PAK

Operating Temperature (°C)

(min)

-40

(max)

150

Output Voltage (V) (nom)

5

Output Tolerance (typ)

2

Output Current (A) (nom)

1.5

Budgetary Price (US$)* / Qty

0.497 / 1k

Country of Origin

CHINA

L4940V85

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.578 / 1k

Distributor availability ofL4940V85

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1865 1 Order Now
COMPEL EUROPE 202 1 Order Now
RS COMPONENTS EUROPE 1090 5 Order Now
ARROW EUROPE 1940 0 Order Now
MOUSER WORLDWIDE 1845 1 Order Now

Distributor reported inventory date: 2020-08-13

Distributor Name

DIGIKEY

Stock

1865

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

202

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1090

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

1940

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1845

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-13

ECCN (EU)

NEC

Packing Type

Tube

Package

TO-220

Operating Temperature (°C)

(min)

-40

(max)

150

Output Voltage (V) (nom)

8.5

Output Tolerance (typ)

2

Output Current (A) (nom)

1.5

Budgetary Price (US$)* / Qty

0.578 / 1k

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