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  • The LDF is a fast, very low drop linear regulator which operates from an input supply voltage in the range of 2.6 V to 16 V.

    It is available in fixed and adjustable output voltage versions, from 0.8 V to 12 V.
    The LDF features are: high output precision, very low-dropout voltage, low noise, and low quiescent current, therefore suitable for low voltage microprocessors and memory applications.
    Enable logic control pin and power-good output are featured on PPAK/DFN packages.
    Current and thermal protection are provided.

    Key Features

    • Input voltage from 2.6 to 16 V
    • Very low-dropout voltage (500 mV max. at 1 A load)
    • Low quiescent current (200 μA typ. @ 1 A load)
    • Available in 1% precision in PPAK and DFN6 packages, 2% in DPAK
    • 1 A guaranteed output current
    • Wide range of output voltages available on request: adjustable from 0.8 V, fixed up to 12 V in 100 mV steps
    • Logic-controlled electronic shutdown
    • Power Good (PPAK and DFN packages)
    • Fast dynamic response to line and load changes
    • Internal current and thermal protections
    • Temperature range: -40 °C to 125 °C

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
LDF18PT-TR
Active
PPACK 5 Industrial Ecopack2
LDF25PT-TR
Active
PPACK 5 Industrial Ecopack2
LDF33DT-TR
Active
DPAK Industrial Ecopack2
LDF33PT-TR
Active
PPACK 5 Industrial Ecopack2
LDFPT-TR
Active
PPACK 5 Industrial Ecopack2
LDFPUR
Active
DFN6 3x3 Industrial Ecopack2
LDFPVR
Active
DFN6 2x2 Industrial Ecopack2

LDF18PT-TR

Package:

PPACK 5

Material Declaration**:

Marketing Status

Active

Package

PPACK 5

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDF25PT-TR

Package:

PPACK 5

Material Declaration**:

Marketing Status

Active

Package

PPACK 5

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDF33DT-TR

Package:

DPAK

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DPAK

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDF33PT-TR

Package:

PPACK 5

Material Declaration**:

Marketing Status

Active

Package

PPACK 5

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFPT-TR

Package:

PPACK 5

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PPACK 5

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFPUR

Package:

DFN6 3x3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN6 3x3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFPVR

Package:

DFN6 2x2

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN6 2x2

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
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Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Output Voltage (V) (nom)
Budgetary Price (US$)*/Qty
More info
min
max
LDFPT-TR Available at 6 distributors

Distributor availability ofLDFPT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2061 1 Order Now
RS COMPONENTS EUROPE 1405 1 Order Now
AVNET AMERICA 2500 0 Order Now
Newark Element14 AMERICA 126 0 Order Now
MOUSER WORLDWIDE 2657 1 Order Now
Farnell Element14 EUROPE 583 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

2061

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1405

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

Newark Element14

Stock

126

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

2657

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

583

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel PPACK 5 -40 125 - 0.476 / 1k
MORE INFO

Output Tolerance (typ):

1

Output Current (A) (nom):

1

Unit Price (US$):

0.476

Country of Origin:

CHINA

LDFPVR Available at 4 distributors

Distributor availability ofLDFPVR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5935 1 Order Now
AVNET AMERICA 18000 0 Order Now
MOUSER WORLDWIDE 2246 1 Order Now
Farnell Element14 EUROPE 1024 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

5935

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

18000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

2246

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1024

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel DFN6 2x2 -40 125 - 0.476 / 1k
MORE INFO

Output Tolerance (typ):

1

Output Current (A) (nom):

1

Unit Price (US$):

0.476

Country of Origin:

CHINA

LDFPUR Available at 6 distributors

Distributor availability ofLDFPUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 208 1 Order Now
RS COMPONENTS EUROPE 1840 1 Order Now
Newark Element14 AMERICA 588 0 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 4851 1 Order Now
Farnell Element14 EUROPE 45 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

208

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1840

Min.Order

1

Region

EUROPE Order Now

Newark Element14

Stock

588

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

3000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

4851

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

45

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel DFN6 3x3 -40 125 - 0.476 / 1k
MORE INFO

Output Tolerance (typ):

1

Output Current (A) (nom):

1

Unit Price (US$):

0.476

Country of Origin:

CHINA

LDF33PT-TR Available at 5 distributors

Distributor availability ofLDF33PT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2206 1 Order Now
RS COMPONENTS EUROPE 1515 1 Order Now
MOUSER WORLDWIDE 2389 1 Order Now
Farnell Element14 EUROPE 279 1 Order Now
ANGLIA Live EUROPE 2500 2500 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

2206

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1515

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

2389

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

279

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

2500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel PPACK 5 -40 125 3.3 0.549 / 1k
MORE INFO

Output Tolerance (typ):

1

Output Current (A) (nom):

1

Unit Price (US$):

0.549

Country of Origin:

CHINA

LDF25PT-TR Available at 1 distributors

Distributor availability ofLDF25PT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 500 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

500

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-23

Active
EAR99 NEC Tape And Reel PPACK 5 -40 125 2.5 0.549 / 1k
MORE INFO

Output Tolerance (typ):

1

Output Current (A) (nom):

1

Unit Price (US$):

0.549

Country of Origin:

CHINA

LDF18PT-TR Available at 1 distributors

Distributor availability ofLDF18PT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 498 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

498

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-23

Active
EAR99 NEC Tape And Reel PPACK 5 -40 125 1.8 0.549 / 1k
MORE INFO

Output Tolerance (typ):

1

Output Current (A) (nom):

1

Unit Price (US$):

0.549

Country of Origin:

CHINA

LDF33DT-TR Available at 6 distributors

Distributor availability ofLDF33DT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1872 1 Order Now
RS COMPONENTS EUROPE 2280 1 Order Now
Newark Element14 AMERICA 486 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 4013 1 Order Now
Farnell Element14 EUROPE 1822 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

1872

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2280

Min.Order

1

Region

EUROPE Order Now

Newark Element14

Stock

486

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

2500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

4013

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1822

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel DPAK -40 125 3.3 0.549 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

1

Unit Price (US$):

0.549

Country of Origin:

CHINA

LDFPT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFPT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2061 1 Order Now
RS COMPONENTS EUROPE 1405 1 Order Now
AVNET AMERICA 2500 0 Order Now
Newark Element14 AMERICA 126 0 Order Now
MOUSER WORLDWIDE 2657 1 Order Now
Farnell Element14 EUROPE 583 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

2061

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1405

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

Newark Element14

Stock

126

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

2657

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

583

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

PPACK 5

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

-

Output Tolerance (typ)

1

Output Current (A) (nom)

1

Budgetary Price (US$)* / Qty

0.476 / 1k

Country of Origin

CHINA

LDFPVR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFPVR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5935 1 Order Now
AVNET AMERICA 18000 0 Order Now
MOUSER WORLDWIDE 2246 1 Order Now
Farnell Element14 EUROPE 1024 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

5935

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

18000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

2246

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1024

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DFN6 2x2

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

-

Output Tolerance (typ)

1

Output Current (A) (nom)

1

Budgetary Price (US$)* / Qty

0.476 / 1k

Country of Origin

CHINA

LDFPUR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFPUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 208 1 Order Now
RS COMPONENTS EUROPE 1840 1 Order Now
Newark Element14 AMERICA 588 0 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 4851 1 Order Now
Farnell Element14 EUROPE 45 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

208

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1840

Min.Order

1

Region

EUROPE Order Now

Newark Element14

Stock

588

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

3000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

4851

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

45

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DFN6 3x3

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

-

Output Tolerance (typ)

1

Output Current (A) (nom)

1

Budgetary Price (US$)* / Qty

0.476 / 1k

Country of Origin

CHINA

LDF33PT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.549 / 1k

Distributor availability ofLDF33PT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2206 1 Order Now
RS COMPONENTS EUROPE 1515 1 Order Now
MOUSER WORLDWIDE 2389 1 Order Now
Farnell Element14 EUROPE 279 1 Order Now
ANGLIA Live EUROPE 2500 2500 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

2206

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1515

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

2389

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

279

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

2500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

PPACK 5

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

1

Output Current (A) (nom)

1

Budgetary Price (US$)* / Qty

0.549 / 1k

Country of Origin

CHINA

LDF25PT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.549 / 1k

Distributor availability ofLDF25PT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 500 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

500

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

PPACK 5

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

2.5

Output Tolerance (typ)

1

Output Current (A) (nom)

1

Budgetary Price (US$)* / Qty

0.549 / 1k

Country of Origin

CHINA

LDF18PT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.549 / 1k

Distributor availability ofLDF18PT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 498 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

498

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

PPACK 5

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

1.8

Output Tolerance (typ)

1

Output Current (A) (nom)

1

Budgetary Price (US$)* / Qty

0.549 / 1k

Country of Origin

CHINA

LDF33DT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.549 / 1k

Distributor availability ofLDF33DT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1872 1 Order Now
RS COMPONENTS EUROPE 2280 1 Order Now
Newark Element14 AMERICA 486 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 4013 1 Order Now
Farnell Element14 EUROPE 1822 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

1872

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2280

Min.Order

1

Region

EUROPE Order Now

Newark Element14

Stock

486

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

2500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

4013

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1822

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DPAK

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

2

Output Current (A) (nom)

1

Budgetary Price (US$)* / Qty

0.549 / 1k

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