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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Distributor availability ofKF33BD-TR

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ANGLIA Live EUROPE 18957 1 Order Now

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16677

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KF80BDT-TR DPAK Tape And Reel 8 2 0.5
Active
0.343 10000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

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Distributor availability ofKF80BDT-TR

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DIGIKEY WORLDWIDE 1448 1 Order Now
RS COMPONENTS EUROPE 2725 1 Order Now
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1448

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1

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2725

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2500

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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 21157 1 Order Now
RS COMPONENTS EUROPE 1080 5 Order Now
ARROW EUROPE 2500 0 Order Now
Newark Element14 AMERICA 100 0 Order Now
MOUSER WORLDWIDE 6783 1 Order Now
Farnell Element14 EUROPE 12 1 Order Now

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DIGIKEY

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21157

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1

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RS COMPONENTS

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1080

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5

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2500

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0

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Stock

100

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0

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Stock

6783

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1

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12

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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

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2208 1 Order Now
RS COMPONENTS EUROPE 11105 5 Order Now
ARROW EUROPE 5000 0 Order Now
MOUSER WORLDWIDE 6646 1 Order Now
Farnell Element14 EUROPE 3360 1 Order Now
ANGLIA Live EUROPE 14998 1 Order Now

Distributor reported inventory date: 2019-07-16

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DIGIKEY

Stock

2208

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1

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RS COMPONENTS

Stock

11105

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

5000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6646

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3360

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1

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EUROPE Order Now

ANGLIA Live

Stock

14998

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1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-16

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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 2612 1 Order Now
ARROW EUROPE 2500 0 Order Now
ARROW AMERICA 671 1 Order Now
MOUSER WORLDWIDE 4509 1 Order Now
Farnell Element14 EUROPE 1628 1 Order Now
RUTRONIK EUROPE 7500 2500 Order Now

Distributor reported inventory date: 2019-07-16

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2135

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1

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RS COMPONENTS

Stock

2612

Min.Order

1

Region

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ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

671

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

4509

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1628

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1

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RUTRONIK

Stock

7500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-16

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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 2300 1 Order Now
Farnell Element14 EUROPE 1914 1 Order Now

Distributor reported inventory date: 2019-07-16

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DIGIKEY

Stock

1280

Min.Order

1

Region

WORLDWIDE Order Now

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Stock

2300

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1

Region

WORLDWIDE Order Now

Farnell Element14

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1914

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1

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Distributor reported inventory date: 2019-07-16

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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 14391 1 Order Now
RS COMPONENTS EUROPE 13060 5 Order Now
AVNET AMERICA 2045 0 Order Now
ARROW EUROPE 2500 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 21507 1 Order Now
Farnell Element14 EUROPE 11123 1 Order Now
RUTRONIK EUROPE 2500 2500 Order Now

Distributor reported inventory date: 2019-07-16

Distributor Name

DIGIKEY

Stock

14391

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

13060

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

2045

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

21507

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

11123

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

2500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-16

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 16677 1 Order Now
RS COMPONENTS EUROPE 9780 5 Order Now
AVNET AMERICA 2500 0 Order Now
ARROW EUROPE 45000 0 Order Now
MOUSER WORLDWIDE 12567 1 Order Now
Farnell Element14 EUROPE 13871 1 Order Now
ANGLIA Live EUROPE 18957 1 Order Now

Distributor reported inventory date: 2019-07-16

Distributor Name

DIGIKEY

Stock

16677

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

9780

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

45000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

12567

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

13871

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

18957

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-16

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: 2019-07-16

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: 2019-07-16

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 21157 1 Order Now
RS COMPONENTS EUROPE 1080 5 Order Now
ARROW EUROPE 2500 0 Order Now
Newark Element14 AMERICA 100 0 Order Now
MOUSER WORLDWIDE 6783 1 Order Now
Farnell Element14 EUROPE 12 1 Order Now

Distributor reported inventory date: 2019-07-16

Distributor Name

DIGIKEY

Stock

21157

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1080

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

6783

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

12

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-16

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 2208 1 Order Now
RS COMPONENTS EUROPE 11105 5 Order Now
ARROW EUROPE 5000 0 Order Now
MOUSER WORLDWIDE 6646 1 Order Now
Farnell Element14 EUROPE 3360 1 Order Now
ANGLIA Live EUROPE 14998 1 Order Now

Distributor reported inventory date: 2019-07-16

Distributor Name

DIGIKEY

Stock

2208

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

11105

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

5000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6646

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3360

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

14998

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-16

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 2612 1 Order Now
ARROW EUROPE 2500 0 Order Now
ARROW AMERICA 671 1 Order Now
MOUSER WORLDWIDE 4509 1 Order Now
Farnell Element14 EUROPE 1628 1 Order Now
RUTRONIK EUROPE 7500 2500 Order Now

Distributor reported inventory date: 2019-07-16

Distributor Name

DIGIKEY

Stock

2135

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2612

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

671

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

4509

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1628

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

7500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-16

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 2300 1 Order Now
Farnell Element14 EUROPE 1914 1 Order Now

Distributor reported inventory date: 2019-07-16

Distributor Name

DIGIKEY

Stock

1280

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2300

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1914

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-16

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 14391 1 Order Now
RS COMPONENTS EUROPE 13060 5 Order Now
AVNET AMERICA 2045 0 Order Now
ARROW EUROPE 2500 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 21507 1 Order Now
Farnell Element14 EUROPE 11123 1 Order Now
RUTRONIK EUROPE 2500 2500 Order Now

Distributor reported inventory date: 2019-07-16

Distributor Name

DIGIKEY

Stock

14391

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

13060

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

2045

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

21507

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

11123

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

2500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-07-16

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.