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 Voltage (V) (nom)
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LD2981ABU50TR SOT-89 Tape And Reel 5 0.75 0.1
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LD2981CM33TR SOT23-5L Tape And Reel 3.3 0.75 0.1
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LD2981ABM50TR SOT23-5L Tape And Reel 5 0.75 0.1
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LD2981CM30TR SOT23-5L Tape And Reel 3 0.75 0.1
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MOUSER WORLDWIDE 5652 1 Order Now
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LD2981ABU33TR SOT-89 Tape And Reel 3.3 0.75 0.1
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EAR99
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FUTURE WORLDWIDE 9241 1 Order Now
ARROW EUROPE 122500 0 Order Now
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MOUSER WORLDWIDE 13447 1 Order Now

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16451

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5194

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210

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10

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30000

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0

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Stock

9241

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Stock

122500

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0

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217500

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2500

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Stock

13447

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LD2981ABM30TR SOT23-5L Tape And Reel 3 0.75 0.1
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1

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4190

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51000

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3924

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1

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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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MOUSER WORLDWIDE 2435 1 Order Now
Farnell Element14 EUROPE 4618 1 Order Now

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770

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12000

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4618

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LD2981CU50TR SOT-89 Tape And Reel 5 0.75 0.1
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DIGIKEY WORLDWIDE 7006 1 Order Now
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332

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Stock

2500

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2500

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6655

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1

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20000

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Distributor reported inventory date: 2020-03-30

LD2981CM50TR SOT23-5L Tape And Reel 5 0.75 0.1
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EAR99
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Country of Origin:

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0.61 / 1k Buy now Check Availability

Distributor availability ofLD2981CM50TR

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DIGIKEY WORLDWIDE 7926 1 Order Now
RS COMPONENTS EUROPE 4465 1 Order Now
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MOUSER WORLDWIDE 4318 1 Order Now
Farnell Element14 EUROPE 5617 1 Order Now
RUTRONIK EUROPE 21000 3000 Order Now

Distributor reported inventory date: 2020-03-30

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DIGIKEY

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7926

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1

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4465

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1

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Stock

3000

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0

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Stock

4318

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1

Region

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Stock

5617

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1

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Stock

21000

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3000

Region

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Distributor reported inventory date: 2020-03-30

LD2981CU33TR SOT-89 Tape And Reel 3.3 0.75 0.1
Active
EAR99
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Country of Origin:

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0.66 / 1k Buy now Check Availability

Distributor availability ofLD2981CU33TR

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DIGIKEY WORLDWIDE 10691 1 Order Now
RS COMPONENTS EUROPE 3255 1 Order Now
Newark Element14 AMERICA 312 0 Order Now
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10691

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3255

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Stock

312

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0

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Stock

10992

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1

Region

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Distributor reported inventory date: 2020-03-30

LD2981ABU50TR

Package

SOT-89

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.72 / 1k

Distributor availability ofLD2981ABU50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5105 1 Order Now
COMPEL EUROPE 10294 1 Order Now
RS COMPONENTS EUROPE 1490 1 Order Now
ARROW EUROPE 70000 0 Order Now
ARROW AMERICA 37500 2500 Order Now
MOUSER WORLDWIDE 8063 1 Order Now

Distributor reported inventory date: 2020-03-30

Distributor Name

DIGIKEY

Stock

5105

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

10294

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1490

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

70000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

37500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

8063

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-03-30

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.72 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CM33TR

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.61 / 1k

Distributor availability ofLD2981CM33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 13652 1 Order Now
RS COMPONENTS EUROPE 24820 10 Order Now
FUTURE WORLDWIDE 15000 3000 Order Now
ARROW EUROPE 6000 0 Order Now
Newark Element14 AMERICA 1142 0 Order Now
ARROW AMERICA 15000 3000 Order Now
MOUSER WORLDWIDE 14767 1 Order Now

Distributor reported inventory date: 2020-03-30

Distributor Name

DIGIKEY

Stock

13652

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

24820

Min.Order

10

Region

EUROPE Order Now

FUTURE

Stock

15000

Min.Order

3000

Region

WORLDWIDE Order Now

ARROW

Stock

6000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

1142

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

15000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

14767

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-03-30

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.61 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981ABM50TR

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.61 / 1k

Distributor availability ofLD2981ABM50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2925 1 Order Now
RS COMPONENTS EUROPE 110 10 Order Now
FUTURE WORLDWIDE 3000 3000 Order Now
ARROW EUROPE 6000 0 Order Now
ARROW AMERICA 4 1 Order Now
MOUSER WORLDWIDE 3978 1 Order Now
Farnell Element14 EUROPE 1639 1 Order Now

Distributor reported inventory date: 2020-03-30

Distributor Name

DIGIKEY

Stock

2925

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

110

Min.Order

10

Region

EUROPE Order Now

FUTURE

Stock

3000

Min.Order

3000

Region

WORLDWIDE Order Now

ARROW

Stock

6000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

4

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

3978

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1639

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-03-30

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.61 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CM30TR

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.47 / 1k

Distributor availability ofLD2981CM30TR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 5652 1 Order Now
Farnell Element14 EUROPE 4296 1 Order Now

Distributor reported inventory date: 2020-03-30

Distributor Name

MOUSER

Stock

5652

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4296

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-03-30

Output Voltage (V) (nom)

3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.47 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD2981ABU33TR

Package

SOT-89

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.72 / 1k

Distributor availability ofLD2981ABU33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 16451 1 Order Now
COMPEL EUROPE 5194 1 Order Now
RS COMPONENTS EUROPE 210 10 Order Now
AVNET AMERICA 30000 0 Order Now
FUTURE WORLDWIDE 9241 1 Order Now
ARROW EUROPE 122500 0 Order Now
ARROW AMERICA 217500 2500 Order Now
MOUSER WORLDWIDE 13447 1 Order Now

Distributor reported inventory date: 2020-03-30

Distributor Name

DIGIKEY

Stock

16451

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

5194

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

210

Min.Order

10

Region

EUROPE Order Now

AVNET

Stock

30000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

9241

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

122500

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

217500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

13447

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-03-30

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.72 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981ABM30TR

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.66 / 1k

Distributor availability ofLD2981ABM30TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2900 1 Order Now
RS COMPONENTS EUROPE 4190 1 Order Now
ARROW EUROPE 51000 0 Order Now
MOUSER WORLDWIDE 3924 1 Order Now
ANGLIA Live EUROPE 5 3000 Order Now

Distributor reported inventory date: 2020-03-30

Distributor Name

DIGIKEY

Stock

2900

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4190

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

51000

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: 2020-03-30

Output Voltage (V) (nom)

3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.66 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD2981ABM33TR

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.67 / 1k

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 18000 0 Order Now
MOUSER WORLDWIDE 2435 1 Order Now
Farnell Element14 EUROPE 4618 1 Order Now

Distributor reported inventory date: 2020-03-30

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

18000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

2435

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4618

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-03-30

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.67 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CU50TR

Package

SOT-89

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.66 / 1k

Distributor availability ofLD2981CU50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7006 1 Order Now
RS COMPONENTS EUROPE 2375 5 Order Now
ARROW EUROPE 7500 0 Order Now
Newark Element14 AMERICA 332 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 6655 1 Order Now
RUTRONIK EUROPE 20000 2500 Order Now

Distributor reported inventory date: 2020-03-30

Distributor Name

DIGIKEY

Stock

7006

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2375

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

6655

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

20000

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-03-30

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.66 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CM50TR

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.61 / 1k

Distributor availability ofLD2981CM50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7926 1 Order Now
RS COMPONENTS EUROPE 4465 1 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 4318 1 Order Now
Farnell Element14 EUROPE 5617 1 Order Now
RUTRONIK EUROPE 21000 3000 Order Now

Distributor reported inventory date: 2020-03-30

Distributor Name

DIGIKEY

Stock

7926

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4465

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

4318

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5617

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

21000

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2020-03-30

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.61 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CU33TR

Package

SOT-89

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.66 / 1k

Distributor availability ofLD2981CU33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 10691 1 Order Now
RS COMPONENTS EUROPE 3255 1 Order Now
Newark Element14 AMERICA 312 0 Order Now
MOUSER WORLDWIDE 10992 1 Order Now

Distributor reported inventory date: 2020-03-30

Distributor Name

DIGIKEY

Stock

10691

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

3255

Min.Order

1

Region

EUROPE Order Now

Newark Element14

Stock

312

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

10992

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-03-30

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.66 / 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

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Technical Documentation

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

      Ultra low-drop voltage regulators with inhibit

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
      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

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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