Very low drop voltage regulators with inhibit

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  • The KF series are very low drop regulators available in SO-8 and DPAK packages and in a wide range of output voltages.

    The very low dropout voltage (0.4 V) and the very low quiescent current make them particularly suitable for low noise, low power applications and especially in battery powered systems.
    A shutdown logic control function is available (pin 5, TTL compatible). This means that when the device is used as a local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. It requires only a 2.2 μF capacitor for stability allowing space and cost saving.

    Key Features

    • Very low dropout voltage (0.4 V)
    • Very low quiescent current (typ. 50 μA in OFF mode, 500 μA in ON mode)
    • Output current up to 500 mA
    • Logic-controlled electronic shutdown
    • Output voltages of 2.5; 3.3; 5; 8 V
    • Internal current and thermal limit
    • Only 2.2 μF for stability
    • Available in ± 2 % accuracy at 25 °C
    • Supply voltage rejection: 70 db (typ.)
    • Temperature range: - 40 to 125 °C

Sample & Buy

Part Number
Package
Packing Type
Output Voltage (V) (nom)
Output Tolerance (typ)
Output Current (A) (nom)
Marketing Status
Budgetary Price (US$)*
Quantity
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KF33BD-TR SO-8 Tape And Reel 3.3 2 0.5
Active
0.32 10000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

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Distributor availability ofKF33BD-TR

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KF80BDT-TR DPAK Tape And Reel 8 2 0.5
Active
0.343 10000
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ECCN (US):

EAR99

Country of Origin:

CHINA

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Distributor availability ofKF80BDT-TR

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DIGIKEY WORLDWIDE 1398 1 Order Now
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1398

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1

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2620

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2500

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2445

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KF50BDT-TR DPAK Tape And Reel 5 2 0.5
Active
0.343 10000
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ECCN (US):

EAR99

Country of Origin:

CHINA

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Distributor availability ofKF50BDT-TR

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DIGIKEY WORLDWIDE 10350 1 Order Now
RS COMPONENTS EUROPE 2340 5 Order Now
ARROW EUROPE 2500 0 Order Now
Newark Element14 AMERICA 100 0 Order Now
MOUSER WORLDWIDE 4700 1 Order Now
Farnell Element14 EUROPE 198 1 Order Now

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10350

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1

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2340

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5

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2500

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0

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100

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4700

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1

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198

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1

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KF50BD-TR SO-8 Tape And Reel 5 2 0.5
Active
0.32 10000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofKF50BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2008 1 Order Now
RS COMPONENTS EUROPE 13055 5 Order Now
ARROW EUROPE 22500 0 Order Now
MOUSER WORLDWIDE 4408 1 Order Now
Farnell Element14 EUROPE 5563 1 Order Now
ANGLIA Live EUROPE 37475 1 Order Now

Distributor reported inventory date: 2019-12-08

Distributor Name

DIGIKEY

Stock

2008

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

13055

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

22500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

4408

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5563

Min.Order

1

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EUROPE Order Now

ANGLIA Live

Stock

37475

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-08

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KF25BD-TR SO-8 Tape And Reel 2.5 2 0.5
Active
0.32 10000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofKF25BD-TR

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DIGIKEY WORLDWIDE 2135 1 Order Now
RS COMPONENTS EUROPE 5092 1 Order Now
ARROW EUROPE 7500 0 Order Now
ARROW AMERICA 671 1 Order Now
MOUSER WORLDWIDE 4204 1 Order Now
Farnell Element14 EUROPE 208 1 Order Now
RUTRONIK EUROPE 2500 2500 Order Now

Distributor reported inventory date: 2019-12-08

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DIGIKEY

Stock

2135

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

5092

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

7500

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

671

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

4204

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

208

Min.Order

1

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EUROPE Order Now

RUTRONIK

Stock

2500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-08

Buy now
KF25BDT-TR DPAK Tape And Reel 2.5 2 0.5
Active
0.368 10000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofKF25BDT-TR

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DIGIKEY WORLDWIDE 603 1 Order Now
MOUSER WORLDWIDE 2190 1 Order Now
Farnell Element14 EUROPE 1914 1 Order Now

Distributor reported inventory date: 2019-12-08

Distributor Name

DIGIKEY

Stock

603

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2190

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1914

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-08

Buy now
KF33BDT-TR DPAK Tape And Reel 3.3 2 0.5
Active
0.368 10000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofKF33BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7440 1 Order Now
RS COMPONENTS EUROPE 24140 5 Order Now
AVNET AMERICA 4420 0 Order Now
FUTURE WORLDWIDE 718 1 Order Now
ARROW EUROPE 7500 0 Order Now
MOUSER WORLDWIDE 17339 1 Order Now
Farnell Element14 EUROPE 7467 1 Order Now
RUTRONIK EUROPE 7500 2500 Order Now

Distributor reported inventory date: 2019-12-08

Distributor Name

DIGIKEY

Stock

7440

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

24140

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

4420

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

718

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

7500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

17339

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

7467

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

7500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-08

Buy now

KF33BD-TR

Package

SO-8

Packing Type

Tape And Reel

Unit Price (US$)

0.32*

Distributor availability ofKF33BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 12990 1 Order Now
RS COMPONENTS EUROPE 7535 5 Order Now
AVNET AMERICA 2500 0 Order Now
ARROW EUROPE 42500 0 Order Now
MOUSER WORLDWIDE 10143 1 Order Now
Farnell Element14 EUROPE 7247 1 Order Now
ANGLIA Live EUROPE 12607 1 Order Now

Distributor reported inventory date: 2019-12-08

Distributor Name

DIGIKEY

Stock

12990

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

7535

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

42500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

10143

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

7247

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

12607

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-08

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

Active

Unit Price (US$)

0.32

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

KF80BDT-TR

Package

DPAK

Packing Type

Tape And Reel

Unit Price (US$)

0.343*

Distributor availability ofKF80BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1398 1 Order Now
RS COMPONENTS EUROPE 2620 1 Order Now
ARROW EUROPE 2500 0 Order Now
MOUSER WORLDWIDE 2445 1 Order Now

Distributor reported inventory date: 2019-12-08

Distributor Name

DIGIKEY

Stock

1398

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2620

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

2445

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-12-08

Output Voltage (V) (nom)

8

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

Active

Unit Price (US$)

0.343

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

KF50BDT-TR

Package

DPAK

Packing Type

Tape And Reel

Unit Price (US$)

0.343*

Distributor availability ofKF50BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 10350 1 Order Now
RS COMPONENTS EUROPE 2340 5 Order Now
ARROW EUROPE 2500 0 Order Now
Newark Element14 AMERICA 100 0 Order Now
MOUSER WORLDWIDE 4700 1 Order Now
Farnell Element14 EUROPE 198 1 Order Now

Distributor reported inventory date: 2019-12-08

Distributor Name

DIGIKEY

Stock

10350

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2340

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

100

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

4700

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

198

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-08

Output Voltage (V) (nom)

5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

Active

Unit Price (US$)

0.343

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

KF50BD-TR

Package

SO-8

Packing Type

Tape And Reel

Unit Price (US$)

0.32*

Distributor availability ofKF50BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2008 1 Order Now
RS COMPONENTS EUROPE 13055 5 Order Now
ARROW EUROPE 22500 0 Order Now
MOUSER WORLDWIDE 4408 1 Order Now
Farnell Element14 EUROPE 5563 1 Order Now
ANGLIA Live EUROPE 37475 1 Order Now

Distributor reported inventory date: 2019-12-08

Distributor Name

DIGIKEY

Stock

2008

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

13055

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

22500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

4408

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5563

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

37475

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-08

Output Voltage (V) (nom)

5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

Active

Unit Price (US$)

0.32

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

KF25BD-TR

Package

SO-8

Packing Type

Tape And Reel

Unit Price (US$)

0.32*

Distributor availability ofKF25BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2135 1 Order Now
RS COMPONENTS EUROPE 5092 1 Order Now
ARROW EUROPE 7500 0 Order Now
ARROW AMERICA 671 1 Order Now
MOUSER WORLDWIDE 4204 1 Order Now
Farnell Element14 EUROPE 208 1 Order Now
RUTRONIK EUROPE 2500 2500 Order Now

Distributor reported inventory date: 2019-12-08

Distributor Name

DIGIKEY

Stock

2135

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

5092

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

7500

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

671

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

4204

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

208

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

2500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-08

Output Voltage (V) (nom)

2.5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

Active

Unit Price (US$)

0.32

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

KF25BDT-TR

Package

DPAK

Packing Type

Tape And Reel

Unit Price (US$)

0.368*

Distributor availability ofKF25BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 603 1 Order Now
MOUSER WORLDWIDE 2190 1 Order Now
Farnell Element14 EUROPE 1914 1 Order Now

Distributor reported inventory date: 2019-12-08

Distributor Name

DIGIKEY

Stock

603

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2190

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1914

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-08

Output Voltage (V) (nom)

2.5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

Active

Unit Price (US$)

0.368

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

KF33BDT-TR

Package

DPAK

Packing Type

Tape And Reel

Unit Price (US$)

0.368*

Distributor availability ofKF33BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7440 1 Order Now
RS COMPONENTS EUROPE 24140 5 Order Now
AVNET AMERICA 4420 0 Order Now
FUTURE WORLDWIDE 718 1 Order Now
ARROW EUROPE 7500 0 Order Now
MOUSER WORLDWIDE 17339 1 Order Now
Farnell Element14 EUROPE 7467 1 Order Now
RUTRONIK EUROPE 7500 2500 Order Now

Distributor reported inventory date: 2019-12-08

Distributor Name

DIGIKEY

Stock

7440

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

24140

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

4420

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

718

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

7500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

17339

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

7467

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

7500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-08

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

Active

Unit Price (US$)

0.368

Quantity

10000

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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Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
KF25BD-TR
Active
SO-8 Industrial Ecopack2
KF25BDT-TR
Active
DPAK Industrial Ecopack2
KF33BD-TR
Active
SO-8 Industrial Ecopack2
KF33BDT-TR
Active
DPAK Industrial Ecopack2
KF50BD-TR
Active
SO-8 Industrial Ecopack2
KF50BDT-TR
Active
DPAK Industrial Ecopack2
KF80BDT-TR
Active
DPAK Industrial Ecopack2

KF25BD-TR

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

KF25BDT-TR

Package:

DPAK

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DPAK

Grade

Industrial

RoHS Compliance Grade

Ecopack2

KF33BD-TR

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

KF33BDT-TR

Package:

DPAK

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DPAK

Grade

Industrial

RoHS Compliance Grade

Ecopack2

KF50BD-TR

Package:

SO-8

Material Declaration**:

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

KF50BDT-TR

Package:

DPAK

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DPAK

Grade

Industrial

RoHS Compliance Grade

Ecopack2

KF80BDT-TR

Package:

DPAK

Material Declaration**:

Marketing Status

Active

Package

DPAK

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.

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