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  • The LDFM is a fast, very low drop linear regulator which operates from an input supply voltage in the range of 2.5 V to 16 V.

    It is available in fixed and adjustable output voltage versions, from 0.8 V to 12 V.
    The LDFM features 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 2.5 to 16 V
    • Very low dropout voltage (300 mV max. at 500 mA load)
    • Low quiescent current (200 µA typ. @ 500 mA load)
    • Available in 1 % precision in PPAK and DFN6 packages, 2 % in DPAK
    • 500 mA 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 protection
    • Temperature range: - 40 °C to 125 °C

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STMicroelectronics - LDFM

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.

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Footprints

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3D models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
LDFM33PUR
Active
DFN6 3x3 Industrial Ecopack2
LDFM33PVR
Active
DFN6 2x2 Industrial Ecopack2
LDFM50DT-TR
Active
DPAK Industrial Ecopack2
LDFM50PT-TR
NRND
PPACK 5 Industrial Ecopack2
LDFMPT-TR
Active
PPACK 5 Industrial Ecopack2
LDFMPUR
Active
DFN6 3x3 Industrial Ecopack2
LDFMPVR
Active
DFN6 2x2 Industrial Ecopack2

LDFM33PUR

Package:

DFN6 3x3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN6 3x3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFM33PVR

Package:

DFN6 2x2

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN6 2x2

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFM50DT-TR

Package:

DPAK

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DPAK

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFM50PT-TR

Package:

PPACK 5

Material Declaration**:

Marketing Status

NRND

Package

PPACK 5

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFMPT-TR

Package:

PPACK 5

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PPACK 5

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFMPUR

Package:

DFN6 3x3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN6 3x3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFMPVR

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
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
LDFM50DT-TR Available at 3 distributors

Distributor availability ofLDFM50DT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2136 1 Order Now
MOUSER WORLDWIDE 4946 1 Order Now
Farnell Element14 EUROPE 1323 1 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

DIGIKEY

Stock

2136

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

4946

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1323

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-25

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

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.476

Country of Origin:

CHINA

LDFMPUR Available at 4 distributors

Distributor availability ofLDFMPUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2999 1 Order Now
FUTURE WORLDWIDE 3000 3000 Order Now
MOUSER WORLDWIDE 2455 1 Order Now
Farnell Element14 EUROPE 209 1 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

DIGIKEY

Stock

2999

Min.Order

1

Region

WORLDWIDE Order Now

FUTURE

Stock

3000

Min.Order

3000

Region

WORLDWIDE Order Now

MOUSER

Stock

2455

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

209

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-25

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

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.476

Country of Origin:

CHINA

LDFMPVR Available at 5 distributors

Distributor availability ofLDFMPVR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7879 1 Order Now
ARROW EUROPE 6000 0 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 3954 1 Order Now
Farnell Element14 EUROPE 761 1 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

DIGIKEY

Stock

7879

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

6000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

3000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

3954

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

761

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-25

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

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.476

Country of Origin:

CHINA

LDFM33PUR Available at 4 distributors

Distributor availability ofLDFM33PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1933 1 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 5610 1 Order Now
Farnell Element14 EUROPE 1198 1 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

DIGIKEY

Stock

1933

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

3000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

5610

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1198

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-25

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

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.476

Country of Origin:

CHINA

LDFMPT-TR Available at 6 distributors

Distributor availability ofLDFMPT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3973 1 Order Now
COMPEL EUROPE 1 1 Order Now
RS COMPONENTS EUROPE 2870 1 Order Now
MOUSER WORLDWIDE 1145 1 Order Now
Farnell Element14 EUROPE 1035 1 Order Now
ANGLIA Live EUROPE 2500 2500 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

DIGIKEY

Stock

3973

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

2870

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

1145

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1035

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

2500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-25

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

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.476

Country of Origin:

CHINA

LDFM33PVR Available at 1 distributors

Distributor availability ofLDFM33PVR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 2079 1 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

MOUSER

Stock

2079

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-11-25

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

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.476

Country of Origin:

CHINA

LDFM50PT-TR Available at 5 distributors

Distributor availability ofLDFM50PT-TR

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 62170 1 Order Now
ARROW EUROPE 2500 0 Order Now
Newark Element14 AMERICA 49 0 Order Now
MOUSER WORLDWIDE 531 1 Order Now
Farnell Element14 EUROPE 25 1 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

COMPEL

Stock

62170

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

49

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

531

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

25

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-25

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

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.476

Country of Origin:

CHINA

LDFM50DT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFM50DT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2136 1 Order Now
MOUSER WORLDWIDE 4946 1 Order Now
Farnell Element14 EUROPE 1323 1 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

DIGIKEY

Stock

2136

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

4946

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1323

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-25

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DPAK

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Budgetary Price (US$)* / Qty

0.476 / 1k

Country of Origin

CHINA

LDFMPUR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFMPUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2999 1 Order Now
FUTURE WORLDWIDE 3000 3000 Order Now
MOUSER WORLDWIDE 2455 1 Order Now
Farnell Element14 EUROPE 209 1 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

DIGIKEY

Stock

2999

Min.Order

1

Region

WORLDWIDE Order Now

FUTURE

Stock

3000

Min.Order

3000

Region

WORLDWIDE Order Now

MOUSER

Stock

2455

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

209

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-25

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)

2

Output Current (A) (nom)

0.5

Budgetary Price (US$)* / Qty

0.476 / 1k

Country of Origin

CHINA

LDFMPVR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFMPVR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7879 1 Order Now
ARROW EUROPE 6000 0 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 3954 1 Order Now
Farnell Element14 EUROPE 761 1 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

DIGIKEY

Stock

7879

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

6000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

3000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

3954

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

761

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-25

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)

2

Output Current (A) (nom)

0.5

Budgetary Price (US$)* / Qty

0.476 / 1k

Country of Origin

CHINA

LDFM33PUR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFM33PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1933 1 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 5610 1 Order Now
Farnell Element14 EUROPE 1198 1 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

DIGIKEY

Stock

1933

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

3000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

5610

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1198

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-25

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)

2

Output Current (A) (nom)

0.5

Budgetary Price (US$)* / Qty

0.476 / 1k

Country of Origin

CHINA

LDFMPT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFMPT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3973 1 Order Now
COMPEL EUROPE 1 1 Order Now
RS COMPONENTS EUROPE 2870 1 Order Now
MOUSER WORLDWIDE 1145 1 Order Now
Farnell Element14 EUROPE 1035 1 Order Now
ANGLIA Live EUROPE 2500 2500 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

DIGIKEY

Stock

3973

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

2870

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

1145

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1035

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

2500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-25

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)

2

Output Current (A) (nom)

0.5

Budgetary Price (US$)* / Qty

0.476 / 1k

Country of Origin

CHINA

LDFM33PVR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFM33PVR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 2079 1 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

MOUSER

Stock

2079

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-11-25

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)

2

Output Current (A) (nom)

0.5

Budgetary Price (US$)* / Qty

0.476 / 1k

Country of Origin

CHINA

LDFM50PT-TR

Marketing Status

NRND

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFM50PT-TR

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 62170 1 Order Now
ARROW EUROPE 2500 0 Order Now
Newark Element14 AMERICA 49 0 Order Now
MOUSER WORLDWIDE 531 1 Order Now
Farnell Element14 EUROPE 25 1 Order Now

Distributor reported inventory date: 2020-11-25

Distributor Name

COMPEL

Stock

62170

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

49

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

531

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

25

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-25

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

PPACK 5

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Budgetary Price (US$)* / Qty

0.476 / 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