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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

Sample & Buy

Part Number
Package
Packing Type
Output Voltage (V) (nom)
Output Tolerance (typ)
Output Current (A) (nom)
Marketing Status
Budgetary Price (US$)*
Quantity
More info
Order from Distributors
Order from ST
L4940V5 TO-220 Tube 5 2 1.5
Active
0.578 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofL4940V5

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2024 1 Order Now
RS COMPONENTS EUROPE 1954 1 Order Now
AVNET AMERICA 1000 0 Order Now
FUTURE WORLDWIDE 830 1 Order Now
ARROW EUROPE 18258 0 Order Now
Newark Element14 AMERICA 152 0 Order Now
ARROW AMERICA 65 1000 Order Now
MOUSER WORLDWIDE 3916 1 Order Now
Farnell Element14 EUROPE 875 1 Order Now
ANGLIA Live EUROPE 163 1 Order Now
RUTRONIK EUROPE 700 50 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

DIGIKEY

Stock

2024

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1954

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

1000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

830

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

18258

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

152

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

65

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

3916

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

875

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

163

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

700

Min.Order

50

Region

EUROPE Order Now

Distributor reported inventory date: 2019-05-22

Buy now
L4940D2T12-TR D2PAK Tape And Reel 12 2 1.5
Active
0.497 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofL4940D2T12-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1769 1 Order Now
RS COMPONENTS EUROPE 885 5 Order Now
ARROW EUROPE 2000 0 Order Now
MOUSER WORLDWIDE 2015 1 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

DIGIKEY

Stock

1769

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

885

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

2000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

2015

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-22

Buy now
L4940D2T5-TR D2PAK Tape And Reel 5 2 1.5
Active
0.497 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofL4940D2T5-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7543 1 Order Now
RS COMPONENTS EUROPE 3825 5 Order Now
FUTURE WORLDWIDE 3000 1000 Order Now
ARROW EUROPE 9000 0 Order Now
ARROW AMERICA 36000 1000 Order Now
MOUSER WORLDWIDE 3981 1 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

DIGIKEY

Stock

7543

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

3825

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

3000

Min.Order

1000

Region

WORLDWIDE Order Now

ARROW

Stock

9000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

36000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

3981

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-22

Buy now
L4940V85 TO-220 Tube 8.5 2 1.5
Active
0.578 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofL4940V85

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1340 5 Order Now
ARROW EUROPE 1020 0 Order Now
MOUSER WORLDWIDE 1925 1 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

RS COMPONENTS

Stock

1340

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

1020

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1925

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-22

Buy now

L4940V5

Package

TO-220

Packing Type

Tube

Unit Price (US$)

0.578*

Distributor availability ofL4940V5

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2024 1 Order Now
RS COMPONENTS EUROPE 1954 1 Order Now
AVNET AMERICA 1000 0 Order Now
FUTURE WORLDWIDE 830 1 Order Now
ARROW EUROPE 18258 0 Order Now
Newark Element14 AMERICA 152 0 Order Now
ARROW AMERICA 65 1000 Order Now
MOUSER WORLDWIDE 3916 1 Order Now
Farnell Element14 EUROPE 875 1 Order Now
ANGLIA Live EUROPE 163 1 Order Now
RUTRONIK EUROPE 700 50 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

DIGIKEY

Stock

2024

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1954

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

1000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

830

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

18258

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

152

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

65

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

3916

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

875

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

163

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

700

Min.Order

50

Region

EUROPE Order Now

Distributor reported inventory date: 2019-05-22

Output Voltage (V) (nom)

5

Output Tolerance (typ)

2

Output Current (A) (nom)

1.5

Marketing Status

Active

Unit Price (US$)

0.578

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

L4940D2T12-TR

Package

D2PAK

Packing Type

Tape And Reel

Unit Price (US$)

0.497*

Distributor availability ofL4940D2T12-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1769 1 Order Now
RS COMPONENTS EUROPE 885 5 Order Now
ARROW EUROPE 2000 0 Order Now
MOUSER WORLDWIDE 2015 1 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

DIGIKEY

Stock

1769

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

885

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

2000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

2015

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-22

Output Voltage (V) (nom)

12

Output Tolerance (typ)

2

Output Current (A) (nom)

1.5

Marketing Status

Active

Unit Price (US$)

0.497

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

L4940D2T5-TR

Package

D2PAK

Packing Type

Tape And Reel

Unit Price (US$)

0.497*

Distributor availability ofL4940D2T5-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7543 1 Order Now
RS COMPONENTS EUROPE 3825 5 Order Now
FUTURE WORLDWIDE 3000 1000 Order Now
ARROW EUROPE 9000 0 Order Now
ARROW AMERICA 36000 1000 Order Now
MOUSER WORLDWIDE 3981 1 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

DIGIKEY

Stock

7543

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

3825

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

3000

Min.Order

1000

Region

WORLDWIDE Order Now

ARROW

Stock

9000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

36000

Min.Order

1000

Region

AMERICA Order Now

MOUSER

Stock

3981

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-22

Output Voltage (V) (nom)

5

Output Tolerance (typ)

2

Output Current (A) (nom)

1.5

Marketing Status

Active

Unit Price (US$)

0.497

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

L4940V85

Package

TO-220

Packing Type

Tube

Unit Price (US$)

0.578*

Distributor availability ofL4940V85

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1340 5 Order Now
ARROW EUROPE 1020 0 Order Now
MOUSER WORLDWIDE 1925 1 Order Now

Distributor reported inventory date: 2019-05-22

Distributor Name

RS COMPONENTS

Stock

1340

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

1020

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1925

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-22

Output Voltage (V) (nom)

8.5

Output Tolerance (typ)

2

Output Current (A) (nom)

1.5

Marketing Status

Active

Unit Price (US$)

0.578

Quantity

1000

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

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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.