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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Part Number
Package
Packing Type
Output Voltage (V) (nom)
Output Tolerance (typ)
Output Current (A) (nom)
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LD2981ABU50TR SOT-89 Tape And Reel 5 0.75 0.1
Active
0.209 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

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LD2981CM33TR SOT23-5L Tape And Reel 3.3 0.75 0.1
Active
0.217 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

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Distributor availability ofLD2981CM33TR

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DIGIKEY WORLDWIDE 14845 1 Order Now
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14845

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7490

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10

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21000

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LD2981ABM50TR SOT23-5L Tape And Reel 5 0.75 0.1
Active
0.262 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofLD2981ABM50TR

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DIGIKEY WORLDWIDE 4744 1 Order Now
RS COMPONENTS EUROPE 120 10 Order Now
FUTURE WORLDWIDE 9000 3000 Order Now
ARROW EUROPE 6000 0 Order Now
ARROW AMERICA 4 1 Order Now
MOUSER WORLDWIDE 2969 1 Order Now

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4744

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1

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120

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10

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9000

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3000

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6000

Min.Order

0

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Stock

4

Min.Order

1

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Stock

2969

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1

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LD2981CM30TR SOT23-5L Tape And Reel 3 0.75 0.1
Active
0.217 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

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2543

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Distributor reported inventory date: 2019-05-26

LD2981ABU33TR SOT-89 Tape And Reel 3.3 0.75 0.1
Active
0.209 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofLD2981ABU33TR

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DIGIKEY WORLDWIDE 24666 1 Order Now
RS COMPONENTS EUROPE 1270 10 Order Now
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FUTURE WORLDWIDE 5000 2500 Order Now
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ARROW AMERICA 45000 2500 Order Now
MOUSER WORLDWIDE 11140 1 Order Now

Distributor reported inventory date: 2019-05-26

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DIGIKEY

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24666

Min.Order

1

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RS COMPONENTS

Stock

1270

Min.Order

10

Region

EUROPE Order Now

AVNET

Stock

62500

Min.Order

0

Region

AMERICA Order Now

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Stock

5000

Min.Order

2500

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Stock

2500

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0

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Stock

45000

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2500

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Stock

11140

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1

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LD2981ABM30TR SOT23-5L Tape And Reel 3 0.75 0.1
Active
0.262 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

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4690

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1

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105000

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3974

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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
Active
0.262 1000
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ECCN (US):

EAR99

Country of Origin:

CHINA

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Distributor availability ofLD2981ABM33TR

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DIGIKEY WORLDWIDE 1857 1 Order Now
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1857

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1070

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1

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15000

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0

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20

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3425

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1

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Distributor reported inventory date: 2019-05-26

LD2981CU50TR SOT-89 Tape And Reel 5 0.75 0.1
Active
0.166 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofLD2981CU50TR

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DIGIKEY WORLDWIDE 6029 1 Order Now
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6029

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1

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2695

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5

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Stock

17500

Min.Order

0

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Stock

7285

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1

Region

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Stock

67500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-05-26

LD2981CM50TR SOT23-5L Tape And Reel 5 0.75 0.1
Active
0.217 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofLD2981CM50TR

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 8478 1 Order Now
RS COMPONENTS EUROPE 6860 1 Order Now
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MOUSER WORLDWIDE 3786 1 Order Now

Distributor reported inventory date: 2019-05-26

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Stock

8478

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1

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Stock

6860

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1

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Stock

3000

Min.Order

0

Region

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Stock

3786

Min.Order

1

Region

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Distributor reported inventory date: 2019-05-26

LD2981CU33TR SOT-89 Tape And Reel 3.3 0.75 0.1
Active
0.166 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofLD2981CU33TR

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 15186 1 Order Now
RS COMPONENTS EUROPE 935 1 Order Now
ARROW EUROPE 5000 0 Order Now
MOUSER WORLDWIDE 20967 1 Order Now

Distributor reported inventory date: 2019-05-26

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DIGIKEY

Stock

15186

Min.Order

1

Region

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RS COMPONENTS

Stock

935

Min.Order

1

Region

EUROPE Order Now

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Stock

5000

Min.Order

0

Region

EUROPE Order Now

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Stock

20967

Min.Order

1

Region

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Distributor reported inventory date: 2019-05-26

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 12126 1 Order Now
RS COMPONENTS EUROPE 2050 1 Order Now
AVNET AMERICA 2500 0 Order Now
ARROW EUROPE 37500 0 Order Now
MOUSER WORLDWIDE 12627 1 Order Now

Distributor reported inventory date: 2019-05-26

Distributor Name

DIGIKEY

Stock

12126

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2050

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

37500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

12627

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-26

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 14845 1 Order Now
RS COMPONENTS EUROPE 7490 10 Order Now
FUTURE WORLDWIDE 21000 3000 Order Now
ARROW AMERICA 9000 3000 Order Now
MOUSER WORLDWIDE 17411 1 Order Now

Distributor reported inventory date: 2019-05-26

Distributor Name

DIGIKEY

Stock

14845

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

7490

Min.Order

10

Region

EUROPE Order Now

FUTURE

Stock

21000

Min.Order

3000

Region

WORLDWIDE Order Now

ARROW

Stock

9000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

17411

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-26

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 4744 1 Order Now
RS COMPONENTS EUROPE 120 10 Order Now
FUTURE WORLDWIDE 9000 3000 Order Now
ARROW EUROPE 6000 0 Order Now
ARROW AMERICA 4 1 Order Now
MOUSER WORLDWIDE 2969 1 Order Now

Distributor reported inventory date: 2019-05-26

Distributor Name

DIGIKEY

Stock

4744

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

120

Min.Order

10

Region

EUROPE Order Now

FUTURE

Stock

9000

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

2969

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-26

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 2543 1 Order Now

Distributor reported inventory date: 2019-05-26

Distributor Name

MOUSER

Stock

2543

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-26

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 24666 1 Order Now
RS COMPONENTS EUROPE 1270 10 Order Now
AVNET AMERICA 62500 0 Order Now
FUTURE WORLDWIDE 5000 2500 Order Now
ARROW EUROPE 2500 0 Order Now
ARROW AMERICA 45000 2500 Order Now
MOUSER WORLDWIDE 11140 1 Order Now

Distributor reported inventory date: 2019-05-26

Distributor Name

DIGIKEY

Stock

24666

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1270

Min.Order

10

Region

EUROPE Order Now

AVNET

Stock

62500

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

5000

Min.Order

2500

Region

WORLDWIDE Order Now

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

45000

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

11140

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-26

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
RS COMPONENTS EUROPE 4690 1 Order Now
ARROW EUROPE 105000 0 Order Now
MOUSER WORLDWIDE 3974 1 Order Now
ANGLIA Live EUROPE 5 3000 Order Now

Distributor reported inventory date: 2019-05-26

Distributor Name

RS COMPONENTS

Stock

4690

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

105000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

3974

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

5

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2019-05-26

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 1857 1 Order Now
RS COMPONENTS EUROPE 1070 1 Order Now
AVNET AMERICA 15000 0 Order Now
ARROW AMERICA 20 1 Order Now
MOUSER WORLDWIDE 3425 1 Order Now

Distributor reported inventory date: 2019-05-26

Distributor Name

DIGIKEY

Stock

1857

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1070

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

15000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

20

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

3425

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-26

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 6029 1 Order Now
RS COMPONENTS EUROPE 2695 5 Order Now
ARROW EUROPE 17500 0 Order Now
MOUSER WORLDWIDE 7285 1 Order Now
RUTRONIK EUROPE 67500 2500 Order Now

Distributor reported inventory date: 2019-05-26

Distributor Name

DIGIKEY

Stock

6029

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2695

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

17500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

7285

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

67500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-05-26

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 8478 1 Order Now
RS COMPONENTS EUROPE 6860 1 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 3786 1 Order Now

Distributor reported inventory date: 2019-05-26

Distributor Name

DIGIKEY

Stock

8478

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

6860

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

3786

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-26

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 15186 1 Order Now
RS COMPONENTS EUROPE 935 1 Order Now
ARROW EUROPE 5000 0 Order Now
MOUSER WORLDWIDE 20967 1 Order Now

Distributor reported inventory date: 2019-05-26

Distributor Name

DIGIKEY

Stock

15186

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

935

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

5000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

20967

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-26

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

    • 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

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      370.88 KB
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      4.42 MB
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      216.23 KB
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      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.