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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

Recommended for you

Related Applications

Smart Farming

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      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 2.1
      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**
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.

Sample & Buy

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LD2981ABU50TR Available at 8 distributors

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LD2981ABU33TR Available at 8 distributors

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DIGIKEY WORLDWIDE 14956 1 Order Now
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3490

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100

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10

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EAR99 CHINA 0.209 / 1k
LD2981ABM30TR Available at 6 distributors

Distributor availability ofLD2981ABM30TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2795 1 Order Now
RS COMPONENTS EUROPE 4190 1 Order Now
ARROW EUROPE 51000 0 Order Now
MOUSER WORLDWIDE 2908 1 Order Now
Farnell Element14 EUROPE 3000 1 Order Now
ANGLIA Live EUROPE 5 3000 Order Now

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2795

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1

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Stock

4190

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1

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51000

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2908

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3000

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EAR99 MALAYSIA 0.262 / 1k
LD2981ABM33TR Available at 6 distributors

Distributor availability ofLD2981ABM33TR

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2025 1 Order Now
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710

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4966

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4347

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Distributor reported inventory date: 2020-07-10

Buy now SOT23-5L Tape And Reel 3.3 0.75 0.1
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EAR99 CHINA 0.262 / 1k
LD2981CU50TR Available at 6 distributors

Distributor availability ofLD2981CU50TR

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6016 1 Order Now
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2350

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50000

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332

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Stock

2500

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2500

Region

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Stock

5609

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1

Region

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Distributor reported inventory date: 2020-07-10

Buy now SOT-89 Tape And Reel 5 0.75 0.1
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EAR99 CHINA 0.166 / 1k
LD2981CM50TR Available at 6 distributors

Distributor availability ofLD2981CM50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7924 1 Order Now
RS COMPONENTS EUROPE 4465 1 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 4013 1 Order Now
Farnell Element14 EUROPE 4752 1 Order Now
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7924

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1

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4465

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1

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EAR99 CHINA 0.217 / 1k
LD2981CU33TR Available at 6 distributors

Distributor availability ofLD2981CU33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 10112 1 Order Now
RS COMPONENTS EUROPE 3235 1 Order Now
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312

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Stock

5967

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1

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Stock

2500

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2500

Region

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Distributor reported inventory date: 2020-07-10

Buy now SOT-89 Tape And Reel 3.3 0.75 0.1
Active
EAR99 CHINA 0.166 / 1k

LD2981ABU50TR

Package

SOT-89

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.209 / 1k

Distributor availability ofLD2981ABU50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2859 1 Order Now
COMPEL EUROPE 9990 1 Order Now
RS COMPONENTS EUROPE 1280 1 Order Now
AVNET AMERICA 37500 0 Order Now
ARROW EUROPE 607500 0 Order Now
ARROW AMERICA 30000 2500 Order Now
MOUSER WORLDWIDE 6733 1 Order Now
Farnell Element14 EUROPE 5000 1 Order Now

Distributor reported inventory date: 2020-07-10

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DIGIKEY

Stock

2859

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1

Region

WORLDWIDE Order Now

COMPEL

Stock

9990

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1280

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

37500

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

607500

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0

Region

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ARROW

Stock

30000

Min.Order

2500

Region

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MOUSER

Stock

6733

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-10

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.209 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CM33TR

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.217 / 1k

Distributor availability ofLD2981CM33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 12465 1 Order Now
RS COMPONENTS EUROPE 24790 10 Order Now
FUTURE WORLDWIDE 15000 3000 Order Now
ARROW EUROPE 6000 0 Order Now
Newark Element14 AMERICA 1142 0 Order Now
ARROW AMERICA 18000 3000 Order Now
MOUSER WORLDWIDE 14572 1 Order Now

Distributor reported inventory date: 2020-07-10

Distributor Name

DIGIKEY

Stock

12465

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1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

24790

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

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ARROW

Stock

18000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

14572

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-10

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.217 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981ABM50TR

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.262 / 1k

Distributor availability ofLD2981ABM50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4650 1 Order Now
RS COMPONENTS EUROPE 60 10 Order Now
ARROW EUROPE 9000 0 Order Now
ARROW AMERICA 4 1 Order Now
MOUSER WORLDWIDE 5088 1 Order Now
Farnell Element14 EUROPE 909 1 Order Now

Distributor reported inventory date: 2020-07-10

Distributor Name

DIGIKEY

Stock

4650

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

60

Min.Order

10

Region

EUROPE Order Now

ARROW

Stock

9000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

4

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

5088

Min.Order

1

Region

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Farnell Element14

Stock

909

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-10

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.262 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CM30TR

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.217 / 1k

Distributor availability ofLD2981CM30TR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 5646 1 Order Now
Farnell Element14 EUROPE 3581 1 Order Now

Distributor reported inventory date: 2020-07-10

Distributor Name

MOUSER

Stock

5646

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3581

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-10

Output Voltage (V) (nom)

3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.217 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD2981ABU33TR

Package

SOT-89

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.209 / 1k

Distributor availability ofLD2981ABU33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 14956 1 Order Now
COMPEL EUROPE 3490 1 Order Now
RS COMPONENTS EUROPE 100 10 Order Now
AVNET AMERICA 30000 0 Order Now
FUTURE WORLDWIDE 9241 1 Order Now
ARROW EUROPE 247500 0 Order Now
ARROW AMERICA 55000 2500 Order Now
MOUSER WORLDWIDE 12386 1 Order Now

Distributor reported inventory date: 2020-07-10

Distributor Name

DIGIKEY

Stock

14956

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

3490

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

100

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

247500

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

55000

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

12386

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-10

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.209 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981ABM30TR

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.262 / 1k

Distributor availability ofLD2981ABM30TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2795 1 Order Now
RS COMPONENTS EUROPE 4190 1 Order Now
ARROW EUROPE 51000 0 Order Now
MOUSER WORLDWIDE 2908 1 Order Now
Farnell Element14 EUROPE 3000 1 Order Now
ANGLIA Live EUROPE 5 3000 Order Now

Distributor reported inventory date: 2020-07-10

Distributor Name

DIGIKEY

Stock

2795

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

2908

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3000

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

5

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-10

Output Voltage (V) (nom)

3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.262 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD2981ABM33TR

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.262 / 1k

Distributor availability ofLD2981ABM33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2025 1 Order Now
RS COMPONENTS EUROPE 710 1 Order Now
AVNET AMERICA 6000 0 Order Now
ARROW EUROPE 18000 0 Order Now
MOUSER WORLDWIDE 4966 1 Order Now
Farnell Element14 EUROPE 4347 1 Order Now

Distributor reported inventory date: 2020-07-10

Distributor Name

DIGIKEY

Stock

2025

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

710

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

18000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

4966

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4347

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-10

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.262 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CU50TR

Package

SOT-89

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.166 / 1k

Distributor availability ofLD2981CU50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6016 1 Order Now
RS COMPONENTS EUROPE 2350 5 Order Now
ARROW EUROPE 50000 0 Order Now
Newark Element14 AMERICA 332 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 5609 1 Order Now

Distributor reported inventory date: 2020-07-10

Distributor Name

DIGIKEY

Stock

6016

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2350

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

50000

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

5609

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-10

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.166 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CM50TR

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.217 / 1k

Distributor availability ofLD2981CM50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7924 1 Order Now
RS COMPONENTS EUROPE 4465 1 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 4013 1 Order Now
Farnell Element14 EUROPE 4752 1 Order Now
RUTRONIK EUROPE 21000 3000 Order Now

Distributor reported inventory date: 2020-07-10

Distributor Name

DIGIKEY

Stock

7924

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

4013

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4752

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

21000

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-10

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.217 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CU33TR

Package

SOT-89

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.166 / 1k

Distributor availability ofLD2981CU33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 10112 1 Order Now
RS COMPONENTS EUROPE 3235 1 Order Now
ARROW EUROPE 10000 0 Order Now
Newark Element14 AMERICA 312 0 Order Now
MOUSER WORLDWIDE 5967 1 Order Now
RUTRONIK EUROPE 2500 2500 Order Now

Distributor reported inventory date: 2020-07-10

Distributor Name

DIGIKEY

Stock

10112

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

3235

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

10000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

312

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

5967

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

2500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-10

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.166 / 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