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

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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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16137

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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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1448

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1

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2725

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2500

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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 15761 1 Order Now
RS COMPONENTS EUROPE 3190 5 Order Now
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Newark Element14 AMERICA 100 0 Order Now
MOUSER WORLDWIDE 4631 1 Order Now
Farnell Element14 EUROPE 2493 1 Order Now

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15761

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1

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3190

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5

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2500

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0

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100

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Stock

4631

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1

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2493

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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

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Distributor availability ofKF50BD-TR

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DIGIKEY WORLDWIDE 1705 1 Order Now
RS COMPONENTS EUROPE 10555 5 Order Now
ARROW EUROPE 7500 0 Order Now
MOUSER WORLDWIDE 6606 1 Order Now
Farnell Element14 EUROPE 1956 1 Order Now
ANGLIA Live EUROPE 38616 1 Order Now

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DIGIKEY

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1705

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1

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RS COMPONENTS

Stock

10555

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5

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EUROPE Order Now

ARROW

Stock

7500

Min.Order

0

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EUROPE Order Now

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Stock

6606

Min.Order

1

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Farnell Element14

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1956

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1

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Stock

38616

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1

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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 2602 1 Order Now
ARROW EUROPE 7500 0 Order Now
ARROW AMERICA 671 1 Order Now
MOUSER WORLDWIDE 4454 1 Order Now
Farnell Element14 EUROPE 978 1 Order Now
RUTRONIK EUROPE 7500 2500 Order Now

Distributor reported inventory date: 2019-09-12

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DIGIKEY

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2135

Min.Order

1

Region

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RS COMPONENTS

Stock

2602

Min.Order

1

Region

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ARROW

Stock

7500

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

671

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

4454

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

978

Min.Order

1

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RUTRONIK

Stock

7500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-12

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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 1280 1 Order Now
MOUSER WORLDWIDE 2190 1 Order Now
Farnell Element14 EUROPE 1914 1 Order Now

Distributor reported inventory date: 2019-09-12

Distributor Name

DIGIKEY

Stock

1280

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: 2019-09-12

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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 10105 1 Order Now
RS COMPONENTS EUROPE 12710 5 Order Now
AVNET AMERICA 4420 0 Order Now
FUTURE WORLDWIDE 3218 1 Order Now
ARROW EUROPE 7500 0 Order Now
MOUSER WORLDWIDE 19984 1 Order Now
Farnell Element14 EUROPE 9218 1 Order Now
RUTRONIK EUROPE 7500 2500 Order Now

Distributor reported inventory date: 2019-09-12

Distributor Name

DIGIKEY

Stock

10105

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

12710

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

4420

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

3218

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

7500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

19984

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

9218

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

7500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-12

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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 16137 1 Order Now
RS COMPONENTS EUROPE 8120 5 Order Now
AVNET AMERICA 2500 0 Order Now
ARROW EUROPE 47500 0 Order Now
MOUSER WORLDWIDE 10287 1 Order Now
Farnell Element14 EUROPE 11227 1 Order Now
ANGLIA Live EUROPE 17790 1 Order Now

Distributor reported inventory date: 2019-09-12

Distributor Name

DIGIKEY

Stock

16137

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

8120

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

47500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

10287

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

11227

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

17790

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-12

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 1448 1 Order Now
RS COMPONENTS EUROPE 2725 1 Order Now
ARROW EUROPE 2500 0 Order Now
MOUSER WORLDWIDE 2500 1 Order Now

Distributor reported inventory date: 2019-09-12

Distributor Name

DIGIKEY

Stock

1448

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2725

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

2500

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-09-12

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 15761 1 Order Now
RS COMPONENTS EUROPE 3190 5 Order Now
ARROW EUROPE 2500 0 Order Now
Newark Element14 AMERICA 100 0 Order Now
MOUSER WORLDWIDE 4631 1 Order Now
Farnell Element14 EUROPE 2493 1 Order Now

Distributor reported inventory date: 2019-09-12

Distributor Name

DIGIKEY

Stock

15761

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

3190

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

4631

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2493

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-12

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 1705 1 Order Now
RS COMPONENTS EUROPE 10555 5 Order Now
ARROW EUROPE 7500 0 Order Now
MOUSER WORLDWIDE 6606 1 Order Now
Farnell Element14 EUROPE 1956 1 Order Now
ANGLIA Live EUROPE 38616 1 Order Now

Distributor reported inventory date: 2019-09-12

Distributor Name

DIGIKEY

Stock

1705

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

10555

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

7500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6606

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1956

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

38616

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-12

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 2602 1 Order Now
ARROW EUROPE 7500 0 Order Now
ARROW AMERICA 671 1 Order Now
MOUSER WORLDWIDE 4454 1 Order Now
Farnell Element14 EUROPE 978 1 Order Now
RUTRONIK EUROPE 7500 2500 Order Now

Distributor reported inventory date: 2019-09-12

Distributor Name

DIGIKEY

Stock

2135

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2602

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

4454

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

978

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

7500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-12

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 1280 1 Order Now
MOUSER WORLDWIDE 2190 1 Order Now
Farnell Element14 EUROPE 1914 1 Order Now

Distributor reported inventory date: 2019-09-12

Distributor Name

DIGIKEY

Stock

1280

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: 2019-09-12

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 10105 1 Order Now
RS COMPONENTS EUROPE 12710 5 Order Now
AVNET AMERICA 4420 0 Order Now
FUTURE WORLDWIDE 3218 1 Order Now
ARROW EUROPE 7500 0 Order Now
MOUSER WORLDWIDE 19984 1 Order Now
Farnell Element14 EUROPE 9218 1 Order Now
RUTRONIK EUROPE 7500 2500 Order Now

Distributor reported inventory date: 2019-09-12

Distributor Name

DIGIKEY

Stock

10105

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

12710

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

4420

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

3218

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

7500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

19984

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

9218

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

7500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-12

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.