KFXX

Active

Very low drop voltage regulators with inhibit

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Product overview

Description

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.
  • All 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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Quality and Reliability

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**:

PDF XML

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.

Sample & Buy

Part Number
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ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Output Voltage (V) (nom)
Budgetary Price (US$)*/Qty
More info
min
max
KF33BD-TR Available at 8 distributors

Distributor availability ofKF33BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1826 1 Order Now
COMPEL EUROPE 6256 1 Order Now
RS COMPONENTS EUROPE 4760 5 Order Now
AVNET AMERICA 2500 0 Order Now
Newark Element14 AMERICA 1083 0 Order Now
MOUSER WORLDWIDE 722 1 Order Now
Farnell Element14 EUROPE 3589 1 Order Now
ANGLIA Live EUROPE 8022 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

1826

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

6256

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

4760

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

Newark Element14

Stock

1083

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

722

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3589

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

8022

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-02-26

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Active
EAR99 NEC Tape And Reel SO-8 -40 125 3.3 0.32 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.32

Country of Origin:

CHINA

KF80BDT-TR Available at 3 distributors

Distributor availability ofKF80BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1124 1 Order Now
RS COMPONENTS EUROPE 2340 1 Order Now
MOUSER WORLDWIDE 901 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

1124

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2340

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

901

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-02-26

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Active
EAR99 NEC Tape And Reel DPAK -40 125 8 0.343 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.343

Country of Origin:

CHINA

KF50BDT-TR Available at 6 distributors

Distributor availability ofKF50BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 10327 1 Order Now
COMPEL EUROPE 485 1 Order Now
RS COMPONENTS EUROPE 2785 5 Order Now
Newark Element14 AMERICA 90 0 Order Now
MOUSER WORLDWIDE 3260 1 Order Now
Farnell Element14 EUROPE 2457 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

10327

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

485

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

2785

Min.Order

5

Region

EUROPE Order Now

Newark Element14

Stock

90

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

3260

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2457

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-02-26

Buy Direct
Active
EAR99 NEC Tape And Reel DPAK -40 125 5 0.343 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.343

Country of Origin:

CHINA

KF50BD-TR Available at 6 distributors

Distributor availability ofKF50BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2192 1 Order Now
COMPEL EUROPE 18716 1 Order Now
RS COMPONENTS EUROPE 11180 1 Order Now
MOUSER WORLDWIDE 4190 1 Order Now
Farnell Element14 EUROPE 4496 1 Order Now
ANGLIA Live EUROPE 29701 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

2192

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

18716

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

11180

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

4190

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4496

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

29701

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-02-26

Buy Direct
Active
EAR99 NEC Tape And Reel SO-8 -40 125 5 0.32 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.32

Country of Origin:

CHINA

KF25BD-TR Available at 5 distributors

Distributor availability ofKF25BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 191 1 Order Now
RS COMPONENTS EUROPE 4335 1 Order Now
FUTURE WORLDWIDE 5000 2500 Order Now
MOUSER WORLDWIDE 3690 1 Order Now
Farnell Element14 EUROPE 1801 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

191

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4335

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

5000

Min.Order

2500

Region

WORLDWIDE Order Now

MOUSER

Stock

3690

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1801

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-02-26

Buy Direct
Active
EAR99 NEC Tape And Reel SO-8 -40 125 2.5 0.32 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.32

Country of Origin:

CHINA

KF25BDT-TR Available at 3 distributors

Distributor availability ofKF25BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 62 1 Order Now
MOUSER WORLDWIDE 1154 1 Order Now
Farnell Element14 EUROPE 1546 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

62

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

1154

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1546

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-02-26

Buy Direct
Active
EAR99 NEC Tape And Reel DPAK -40 125 2.5 0.368 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.368

Country of Origin:

CHINA

KF33BDT-TR Available at 7 distributors

Distributor availability ofKF33BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 9412 1 Order Now
COMPEL EUROPE 387 1 Order Now
RS COMPONENTS EUROPE 11650 5 Order Now
AVNET AMERICA 1820 0 Order Now
FUTURE WORLDWIDE 558 1 Order Now
MOUSER WORLDWIDE 5983 1 Order Now
Farnell Element14 EUROPE 5467 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

9412

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

387

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

11650

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

1820

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

558

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

5983

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5467

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-02-26

Buy Direct
Active
EAR99 NEC Tape And Reel DPAK -40 125 3.3 0.368 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.368

Country of Origin:

CHINA

KF33BD-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.32 / 1k

Distributor availability ofKF33BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1826 1 Order Now
COMPEL EUROPE 6256 1 Order Now
RS COMPONENTS EUROPE 4760 5 Order Now
AVNET AMERICA 2500 0 Order Now
Newark Element14 AMERICA 1083 0 Order Now
MOUSER WORLDWIDE 722 1 Order Now
Farnell Element14 EUROPE 3589 1 Order Now
ANGLIA Live EUROPE 8022 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

1826

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

6256

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

4760

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

Newark Element14

Stock

1083

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

722

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3589

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

8022

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-02-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Budgetary Price (US$)* / Qty

0.32 / 1k

Country of Origin

CHINA

KF80BDT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.343 / 1k

Distributor availability ofKF80BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1124 1 Order Now
RS COMPONENTS EUROPE 2340 1 Order Now
MOUSER WORLDWIDE 901 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

1124

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2340

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

901

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-02-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DPAK

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

8

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Budgetary Price (US$)* / Qty

0.343 / 1k

Country of Origin

CHINA

KF50BDT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.343 / 1k

Distributor availability ofKF50BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 10327 1 Order Now
COMPEL EUROPE 485 1 Order Now
RS COMPONENTS EUROPE 2785 5 Order Now
Newark Element14 AMERICA 90 0 Order Now
MOUSER WORLDWIDE 3260 1 Order Now
Farnell Element14 EUROPE 2457 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

10327

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

485

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

2785

Min.Order

5

Region

EUROPE Order Now

Newark Element14

Stock

90

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

3260

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2457

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-02-26

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

0.343 / 1k

Country of Origin

CHINA

KF50BD-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.32 / 1k

Distributor availability ofKF50BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2192 1 Order Now
COMPEL EUROPE 18716 1 Order Now
RS COMPONENTS EUROPE 11180 1 Order Now
MOUSER WORLDWIDE 4190 1 Order Now
Farnell Element14 EUROPE 4496 1 Order Now
ANGLIA Live EUROPE 29701 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

2192

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

18716

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

11180

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

4190

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4496

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

29701

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-02-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

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

0.32 / 1k

Country of Origin

CHINA

KF25BD-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.32 / 1k

Distributor availability ofKF25BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 191 1 Order Now
RS COMPONENTS EUROPE 4335 1 Order Now
FUTURE WORLDWIDE 5000 2500 Order Now
MOUSER WORLDWIDE 3690 1 Order Now
Farnell Element14 EUROPE 1801 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

191

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4335

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

5000

Min.Order

2500

Region

WORLDWIDE Order Now

MOUSER

Stock

3690

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1801

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-02-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

2.5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Budgetary Price (US$)* / Qty

0.32 / 1k

Country of Origin

CHINA

KF25BDT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.368 / 1k

Distributor availability ofKF25BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 62 1 Order Now
MOUSER WORLDWIDE 1154 1 Order Now
Farnell Element14 EUROPE 1546 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

62

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

1154

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1546

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-02-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DPAK

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

2.5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Budgetary Price (US$)* / Qty

0.368 / 1k

Country of Origin

CHINA

KF33BDT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.368 / 1k

Distributor availability ofKF33BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 9412 1 Order Now
COMPEL EUROPE 387 1 Order Now
RS COMPONENTS EUROPE 11650 5 Order Now
AVNET AMERICA 1820 0 Order Now
FUTURE WORLDWIDE 558 1 Order Now
MOUSER WORLDWIDE 5983 1 Order Now
Farnell Element14 EUROPE 5467 1 Order Now

Distributor reported inventory date: 2021-02-26

Distributor Name

DIGIKEY

Stock

9412

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

387

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

11650

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

1820

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

558

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

5983

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5467

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-02-26

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)

0.5

Budgetary Price (US$)* / Qty

0.368 / 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