LD2981

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Ultra low drop voltage regulators with inhibit low ESR output

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  • The LD2981 is a 100 mA fixed-output voltage regulator. The low-drop voltage and the ultra low quiescent current make them suitable for low noise, low power applications and in battery powered systems.

    The quiescent current in sleep mode is less than 1 μA when INHIBIT pin is pulled low. Shutdown logic control function is available on pin n° 3 (TTL compatible). This means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. The LD2981 is designed to work with low ESR ceramic capacitor. Typical applications are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.

    Key Features

    • Ultra low dropout voltage (0.17 V typ. at 100 mA load, 7 mV typ. at 1 mA load)
    • Very low quiescent current (80 μA typ. at no load in on mode; max 1 μA in off mode)
    • Guaranteed output current up to 100 mA
    • Logic-controlled electronic shutdown
    • Output voltage of 2.5; 3.0; 3.3; 5.0 V
    • Internal current and thermal limit
    • ± 0.75% tolerance output voltage available (A version)
    • Output low noise voltage 160 μVRMS
    • Temperature range: -40 to 125 °C
    • Small package SOT23-5L and SOT-89
    • Fast dynamic response to line and load changes

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Output Tolerance (typ)
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LD2981ABU50TR SOT-89 Tape And Reel 5 0.75 0.1
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0.209 1000
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ECCN (US):

EAR99

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CHINA

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LD2981CM33TR SOT23-5L Tape And Reel 3.3 0.75 0.1
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0.217 1000
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ECCN (US):

EAR99

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LD2981ABM50TR SOT23-5L Tape And Reel 5 0.75 0.1
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0.262 1000
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ECCN (US):

EAR99

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LD2981CM30TR SOT23-5L Tape And Reel 3 0.75 0.1
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0.217 1000
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ECCN (US):

EAR99

Country of Origin:

MALAYSIA

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LD2981ABU33TR SOT-89 Tape And Reel 3.3 0.75 0.1
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0.209 1000
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ECCN (US):

EAR99

Country of Origin:

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LD2981ABM30TR SOT23-5L Tape And Reel 3 0.75 0.1
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0.262 1000
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ECCN (US):

EAR99

Country of Origin:

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156000

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5

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3000

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LD2981ABM33TR SOT23-5L Tape And Reel 3.3 0.75 0.1
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0.262 1000
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ECCN (US):

EAR99

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CHINA

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LD2981CU50TR SOT-89 Tape And Reel 5 0.75 0.1
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0.166 1000
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ECCN (US):

EAR99

Country of Origin:

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Distributor availability ofLD2981CU50TR

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LD2981CM50TR SOT23-5L Tape And Reel 5 0.75 0.1
Active
0.217 1000
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ECCN (US):

EAR99

Country of Origin:

CHINA

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Distributor availability ofLD2981CM50TR

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DIGIKEY WORLDWIDE 7928 1 Order Now
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Farnell Element14 EUROPE 5647 1 Order Now
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3000

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4321

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5647

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18000

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LD2981CU33TR SOT-89 Tape And Reel 3.3 0.75 0.1
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0.166 1000
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ECCN (US):

EAR99

Country of Origin:

CHINA

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Distributor availability ofLD2981CU33TR

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DIGIKEY WORLDWIDE 11016 1 Order Now
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LD2981ABU50TR

Package

SOT-89

Packing Type

Tape And Reel

Unit Price (US$)

0.209*

Distributor availability ofLD2981ABU50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5190 1 Order Now
COMPEL EUROPE 3024 1 Order Now
RS COMPONENTS EUROPE 1510 1 Order Now
ARROW EUROPE 115000 0 Order Now
ARROW AMERICA 37500 2500 Order Now
MOUSER WORLDWIDE 8374 1 Order Now

Distributor reported inventory date: 2020-02-25

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DIGIKEY

Stock

5190

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

3024

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1510

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

115000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

37500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

8374

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.209

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CM33TR

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.217*

Distributor availability ofLD2981CM33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 14524 1 Order Now
RS COMPONENTS EUROPE 24820 10 Order Now
FUTURE WORLDWIDE 15000 3000 Order Now
ARROW EUROPE 15000 0 Order Now
Newark Element14 AMERICA 1142 0 Order Now
ARROW AMERICA 6000 3000 Order Now
MOUSER WORLDWIDE 14792 1 Order Now

Distributor reported inventory date: 2020-02-25

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DIGIKEY

Stock

14524

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1

Region

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RS COMPONENTS

Stock

24820

Min.Order

10

Region

EUROPE Order Now

FUTURE

Stock

15000

Min.Order

3000

Region

WORLDWIDE Order Now

ARROW

Stock

15000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

1142

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0

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Stock

6000

Min.Order

3000

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Stock

14792

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1

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Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.217

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981ABM50TR

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.262*

Distributor availability ofLD2981ABM50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2935 1 Order Now
RS COMPONENTS EUROPE 110 10 Order Now
FUTURE WORLDWIDE 6000 3000 Order Now
ARROW EUROPE 9000 0 Order Now
ARROW AMERICA 4 1 Order Now
MOUSER WORLDWIDE 4038 1 Order Now
Farnell Element14 EUROPE 3149 1 Order Now

Distributor reported inventory date: 2020-02-25

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DIGIKEY

Stock

2935

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1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

110

Min.Order

10

Region

EUROPE Order Now

FUTURE

Stock

6000

Min.Order

3000

Region

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ARROW

Stock

9000

Min.Order

0

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ARROW

Stock

4

Min.Order

1

Region

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Stock

4038

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1

Region

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Farnell Element14

Stock

3149

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1

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Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.262

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CM30TR

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.217*

Distributor availability ofLD2981CM30TR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 5652 1 Order Now
Farnell Element14 EUROPE 4706 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

MOUSER

Stock

5652

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4706

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1

Region

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Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.217

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD2981ABU33TR

Package

SOT-89

Packing Type

Tape And Reel

Unit Price (US$)

0.209*

Distributor availability ofLD2981ABU33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 17206 1 Order Now
COMPEL EUROPE 4357 1 Order Now
RS COMPONENTS EUROPE 230 10 Order Now
AVNET AMERICA 32500 0 Order Now
FUTURE WORLDWIDE 9241 1 Order Now
ARROW EUROPE 195000 0 Order Now
ARROW AMERICA 280000 2500 Order Now
MOUSER WORLDWIDE 13902 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

17206

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

4357

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

230

Min.Order

10

Region

EUROPE Order Now

AVNET

Stock

32500

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

9241

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

195000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

280000

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

13902

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.209

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981ABM30TR

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.262*

Distributor availability ofLD2981ABM30TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2900 1 Order Now
RS COMPONENTS EUROPE 4340 1 Order Now
ARROW EUROPE 156000 0 Order Now
MOUSER WORLDWIDE 3924 1 Order Now
ANGLIA Live EUROPE 5 3000 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

2900

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4340

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

156000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

3924

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

5

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.262

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD2981ABM33TR

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.262*

Distributor availability ofLD2981ABM33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1455 1 Order Now
RS COMPONENTS EUROPE 770 1 Order Now
AVNET AMERICA 12000 0 Order Now
ARROW EUROPE 9000 0 Order Now
MOUSER WORLDWIDE 3135 1 Order Now
Farnell Element14 EUROPE 4928 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

1455

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

770

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

12000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

9000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

3135

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4928

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.262

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CU50TR

Package

SOT-89

Packing Type

Tape And Reel

Unit Price (US$)

0.166*

Distributor availability ofLD2981CU50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7031 1 Order Now
RS COMPONENTS EUROPE 2440 5 Order Now
ARROW EUROPE 7500 0 Order Now
Newark Element14 AMERICA 332 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 6683 1 Order Now
RUTRONIK EUROPE 27500 2500 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

7031

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2440

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

7500

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

332

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

2500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

6683

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

27500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.166

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CM50TR

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.217*

Distributor availability ofLD2981CM50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7928 1 Order Now
RS COMPONENTS EUROPE 4475 1 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 4321 1 Order Now
Farnell Element14 EUROPE 5647 1 Order Now
RUTRONIK EUROPE 18000 3000 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

7928

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4475

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

4321

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5647

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

18000

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.217

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CU33TR

Package

SOT-89

Packing Type

Tape And Reel

Unit Price (US$)

0.166*

Distributor availability ofLD2981CU33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 11016 1 Order Now
RS COMPONENTS EUROPE 3255 1 Order Now
ARROW EUROPE 2500 0 Order Now
Newark Element14 AMERICA 312 0 Order Now
MOUSER WORLDWIDE 11017 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

11016

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

3255

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

312

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

11017

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.166

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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Technical Documentation

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      DS1528
      Ultra low-drop voltage regulators with inhibit
      17.0
      1 MB
      PDF
      DS1528

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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 2.0
      216.23 KB
      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

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
LD2981ABM30TR
Active
SOT23-5L Industrial Ecopack2
LD2981ABM33TR
Active
SOT23-5L Industrial Ecopack2
LD2981ABM50TR
Active
SOT23-5L Industrial Ecopack2
LD2981ABU33TR
Active
SOT-89 Industrial Ecopack2
LD2981ABU50TR
Active
SOT-89 Industrial Ecopack2
LD2981CM30TR
Active
SOT23-5L Industrial Ecopack2
LD2981CM33TR
Active
SOT23-5L Industrial Ecopack2
LD2981CM50TR
Active
SOT23-5L Industrial Ecopack2
LD2981CU33TR
Active
SOT-89 Industrial Ecopack2
LD2981CU50TR
Active
SOT-89 Industrial Ecopack2

LD2981ABM30TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981ABM33TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981ABM50TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981ABU33TR

Package:

SOT-89

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT-89

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981ABU50TR

Package:

SOT-89

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT-89

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981CM30TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981CM33TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981CM50TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981CU33TR

Package:

SOT-89

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT-89

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981CU50TR

Package:

SOT-89

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT-89

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) 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.

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