LD2981

Active

Ultra low drop voltage regulators with inhibit low ESR output

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Solutions
Documentation
CAD Resources
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Quality & Reliability
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Product overview

Description

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.
  • All 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

EDA Symbols, Footprints and 3D Models

STMicroelectronics - LD2981

Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.

Symbols

Symbols

Footprints

Footprints

3D model

3D models

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**:

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

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Output Voltage (V) (nom)
Budgetary Price (US$)*/Qty
More info
min
max
LD2981ABU50TR Available at 1 distributors

Distributor availability ofLD2981ABU50TR

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 2489 1 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

COMPEL

Stock

2489

Min.Order

1

Distributor reported inventory date: 2022-01-16

Active
EAR99 NEC Tape And Reel SOT-89 -40 125 5 0.3034 / 1k
MORE INFO

Output Tolerance (typ):

0.75

Output Current (A) (nom):

0.1

Unit Price (US$):

0.3034

Country of Origin:

CHINA

LD2981CM33TR Available at 3 distributors

Distributor availability ofLD2981CM33TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 6030 1 Buy from Distributor
Newark Element14 AMERICA 1111 0 Buy from Distributor
MOUSER WORLDWIDE 2758 1 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

RS COMPONENTS

Stock

6030

Min.Order

1

Newark Element14

Stock

1111

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

2758

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-01-16

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 3.3 0.313 / 1k
MORE INFO

Output Tolerance (typ):

0.75

Output Current (A) (nom):

0.1

Unit Price (US$):

0.313

Country of Origin:

CHINA

LD2981ABM50TR Available at 1 distributors

Distributor availability ofLD2981ABM50TR

Distributor Name
Region Stock Min. Order Third party link
Farnell Element14 EUROPE 12 1 Buy from Distributor

Distributor reported inventory date: 2022-01-15

Distributor Name

Farnell Element14

Stock

12

Min.Order

1

Distributor reported inventory date: 2022-01-15

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 5 0.313 / 1k
MORE INFO

Output Tolerance (typ):

0.75

Output Current (A) (nom):

0.1

Unit Price (US$):

0.313

Country of Origin:

CHINA

LD2981CM30TR Available at 1 distributors

Distributor availability ofLD2981CM30TR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 3770 1 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

MOUSER

Stock

3770

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-01-16

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 3 0.1962 / 1k
MORE INFO

Output Tolerance (typ):

0.75

Output Current (A) (nom):

0.1

Unit Price (US$):

0.1962

Country of Origin:

CHINA

LD2981ABU33TR Available at 2 distributors

Distributor availability ofLD2981ABU33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 13621 1 Buy from Distributor
COMPEL EUROPE 7786 1 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

DIGIKEY

Stock

13621

Min.Order

1

Region

WORLDWIDE Buy from Distributor

COMPEL

Stock

7786

Min.Order

1

Distributor reported inventory date: 2022-01-16

Active
EAR99 NEC Tape And Reel SOT-89 -40 125 3.3 0.3034 / 1k
MORE INFO

Output Tolerance (typ):

0.75

Output Current (A) (nom):

0.1

Unit Price (US$):

0.3034

Country of Origin:

CHINA

LD2981ABM30TR Available at 5 distributors

Distributor availability ofLD2981ABM30TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2998 1 Buy from Distributor
RS COMPONENTS EUROPE 2490 1 Buy from Distributor
MOUSER WORLDWIDE 368 1 Buy from Distributor
Farnell Element14 EUROPE 2930 1 Buy from Distributor
ANGLIA Live EUROPE 5 3000 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

DIGIKEY

Stock

2998

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

2490

Min.Order

1

MOUSER

Stock

368

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

2930

Min.Order

1

ANGLIA Live

Stock

5

Min.Order

3000

Distributor reported inventory date: 2022-01-16

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 3 0.313 / 1k
MORE INFO

Output Tolerance (typ):

0.75

Output Current (A) (nom):

0.1

Unit Price (US$):

0.313

Country of Origin:

CHINA

LD2981ABM33TR Available at 1 distributors

Distributor availability ofLD2981ABM33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1389 1 Buy from Distributor

Distributor reported inventory date: 2022-01-15

Distributor Name

DIGIKEY

Stock

1389

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-01-15

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 3.3 0.313 / 1k
MORE INFO

Output Tolerance (typ):

0.75

Output Current (A) (nom):

0.1

Unit Price (US$):

0.313

Country of Origin:

CHINA

LD2981CU50TR Available at 3 distributors

Distributor availability ofLD2981CU50TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1710 1 Buy from Distributor
Newark Element14 AMERICA 330 0 Buy from Distributor
MOUSER WORLDWIDE 2272 1 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

RS COMPONENTS

Stock

1710

Min.Order

1

Newark Element14

Stock

330

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

2272

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-01-16

Buy Direct
Active
EAR99 NEC Tape And Reel SOT-89 -40 125 5 0.2505 / 1k
MORE INFO

Output Tolerance (typ):

0.75

Output Current (A) (nom):

0.1

Unit Price (US$):

0.2505

Country of Origin:

CHINA

LD2981CM50TR Available at 4 distributors

Distributor availability ofLD2981CM50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4506 1 Buy from Distributor
RS COMPONENTS EUROPE 1240 1 Buy from Distributor
MOUSER WORLDWIDE 2355 1 Buy from Distributor
Farnell Element14 EUROPE 2503 1 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

DIGIKEY

Stock

4506

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

1240

Min.Order

1

MOUSER

Stock

2355

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

2503

Min.Order

1

Distributor reported inventory date: 2022-01-16

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 5 0.313 / 1k
MORE INFO

Output Tolerance (typ):

0.75

Output Current (A) (nom):

0.1

Unit Price (US$):

0.313

Country of Origin:

CHINA

LD2981CU33TR Available at 2 distributors

Distributor availability ofLD2981CU33TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 925 1 Buy from Distributor
Newark Element14 AMERICA 186 0 Buy from Distributor

Distributor reported inventory date: 2022-01-15

Distributor Name

RS COMPONENTS

Stock

925

Min.Order

1

Newark Element14

Stock

186

Min.Order

0

Region

AMERICA Buy from Distributor

Distributor reported inventory date: 2022-01-15

Active
EAR99 NEC Tape And Reel SOT-89 -40 125 3.3 0.2505 / 1k
MORE INFO

Output Tolerance (typ):

0.75

Output Current (A) (nom):

0.1

Unit Price (US$):

0.2505

Country of Origin:

CHINA

LD2981ABU50TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.3034 / 1k

Distributor availability ofLD2981ABU50TR

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 2489 1 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

COMPEL

Stock

2489

Min.Order

1

Distributor reported inventory date: 2022-01-16

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT-89

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Budgetary Price (US$)* / Qty

0.3034 / 1k

Country of Origin

CHINA

LD2981CM33TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.313 / 1k

Distributor availability ofLD2981CM33TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 6030 1 Buy from Distributor
Newark Element14 AMERICA 1111 0 Buy from Distributor
MOUSER WORLDWIDE 2758 1 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

RS COMPONENTS

Stock

6030

Min.Order

1

Newark Element14

Stock

1111

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

2758

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-01-16

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Budgetary Price (US$)* / Qty

0.313 / 1k

Country of Origin

CHINA

LD2981ABM50TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.313 / 1k

Distributor availability ofLD2981ABM50TR

Distributor Name
Region Stock Min. Order Third party link
Farnell Element14 EUROPE 12 1 Buy from Distributor

Distributor reported inventory date: 2022-01-15

Distributor Name

Farnell Element14

Stock

12

Min.Order

1

Distributor reported inventory date: 2022-01-15

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Budgetary Price (US$)* / Qty

0.313 / 1k

Country of Origin

CHINA

LD2981CM30TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.1962 / 1k

Distributor availability ofLD2981CM30TR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 3770 1 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

MOUSER

Stock

3770

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-01-16

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Budgetary Price (US$)* / Qty

0.1962 / 1k

Country of Origin

CHINA

LD2981ABU33TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.3034 / 1k

Distributor availability ofLD2981ABU33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 13621 1 Buy from Distributor
COMPEL EUROPE 7786 1 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

DIGIKEY

Stock

13621

Min.Order

1

Region

WORLDWIDE Buy from Distributor

COMPEL

Stock

7786

Min.Order

1

Distributor reported inventory date: 2022-01-16

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT-89

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Budgetary Price (US$)* / Qty

0.3034 / 1k

Country of Origin

CHINA

LD2981ABM30TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.313 / 1k

Distributor availability ofLD2981ABM30TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2998 1 Buy from Distributor
RS COMPONENTS EUROPE 2490 1 Buy from Distributor
MOUSER WORLDWIDE 368 1 Buy from Distributor
Farnell Element14 EUROPE 2930 1 Buy from Distributor
ANGLIA Live EUROPE 5 3000 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

DIGIKEY

Stock

2998

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

2490

Min.Order

1

MOUSER

Stock

368

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

2930

Min.Order

1

ANGLIA Live

Stock

5

Min.Order

3000

Distributor reported inventory date: 2022-01-16

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Budgetary Price (US$)* / Qty

0.313 / 1k

Country of Origin

CHINA

LD2981ABM33TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.313 / 1k

Distributor availability ofLD2981ABM33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1389 1 Buy from Distributor

Distributor reported inventory date: 2022-01-15

Distributor Name

DIGIKEY

Stock

1389

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-01-15

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Budgetary Price (US$)* / Qty

0.313 / 1k

Country of Origin

CHINA

LD2981CU50TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.2505 / 1k

Distributor availability ofLD2981CU50TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1710 1 Buy from Distributor
Newark Element14 AMERICA 330 0 Buy from Distributor
MOUSER WORLDWIDE 2272 1 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

RS COMPONENTS

Stock

1710

Min.Order

1

Newark Element14

Stock

330

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

2272

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-01-16

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT-89

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Budgetary Price (US$)* / Qty

0.2505 / 1k

Country of Origin

CHINA

LD2981CM50TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.313 / 1k

Distributor availability ofLD2981CM50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4506 1 Buy from Distributor
RS COMPONENTS EUROPE 1240 1 Buy from Distributor
MOUSER WORLDWIDE 2355 1 Buy from Distributor
Farnell Element14 EUROPE 2503 1 Buy from Distributor

Distributor reported inventory date: 2022-01-16

Distributor Name

DIGIKEY

Stock

4506

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

1240

Min.Order

1

MOUSER

Stock

2355

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

2503

Min.Order

1

Distributor reported inventory date: 2022-01-16

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Budgetary Price (US$)* / Qty

0.313 / 1k

Country of Origin

CHINA

LD2981CU33TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.2505 / 1k

Distributor availability ofLD2981CU33TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 925 1 Buy from Distributor
Newark Element14 AMERICA 186 0 Buy from Distributor

Distributor reported inventory date: 2022-01-15

Distributor Name

RS COMPONENTS

Stock

925

Min.Order

1

Newark Element14

Stock

186

Min.Order

0

Region

AMERICA Buy from Distributor

Distributor reported inventory date: 2022-01-15

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT-89

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Budgetary Price (US$)* / Qty

0.2505 / 1k

Country of Origin

CHINA

(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors