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
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
KF33BD-TR Available at 4 distributors

Distributor availability ofKF33BD-TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1045 5 Order Now
Newark Element14 AMERICA 165 0 Order Now
Farnell Element14 EUROPE 20 1 Order Now
ANGLIA Live EUROPE 15952 1 Order Now

Distributor reported inventory date: 2021-09-11

Distributor Name

RS COMPONENTS

Stock

1045

Min.Order

5

Region

EUROPE Order Now

Newark Element14

Stock

165

Min.Order

0

Region

AMERICA Order Now

Farnell Element14

Stock

20

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

15952

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-11

Active
EAR99 NEC Tape And Reel SO-8 -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

KF80BDT-TR Available at 3 distributors

Distributor availability ofKF80BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 494 1 Order Now
RS COMPONENTS EUROPE 2275 1 Order Now
MOUSER WORLDWIDE 791 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

494

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2275

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

791

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-09-12

Buy Direct
Active
EAR99 NEC Tape And Reel DPAK -40 125 8 0.3944 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.3944

Country of Origin:

CHINA

KF50BDT-TR Available at 5 distributors

Distributor availability ofKF50BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 40219 1 Order Now
RS COMPONENTS EUROPE 2695 5 Order Now
Newark Element14 AMERICA 30 0 Order Now
MOUSER WORLDWIDE 3059 1 Order Now
Farnell Element14 EUROPE 533 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

40219

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2695

Min.Order

5

Region

EUROPE Order Now

Newark Element14

Stock

30

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

3059

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

533

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-12

Buy Direct
Active
EAR99 NEC Tape And Reel DPAK -40 125 5 0.3944 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.3944

Country of Origin:

CHINA

KF50BD-TR Available at 4 distributors

Distributor availability ofKF50BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1876 1 Order Now
RS COMPONENTS EUROPE 5800 1 Order Now
Farnell Element14 EUROPE 2164 1 Order Now
ANGLIA Live EUROPE 23640 1 Order Now

Distributor reported inventory date: 2021-09-11

Distributor Name

DIGIKEY

Stock

1876

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

5800

Min.Order

1

Region

EUROPE Order Now

Farnell Element14

Stock

2164

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

23640

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-11

Active
EAR99 NEC Tape And Reel SO-8 -40 125 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

KF25BD-TR Available at 5 distributors

Distributor availability ofKF25BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 21 1 Order Now
RS COMPONENTS EUROPE 4125 1 Order Now
FUTURE WORLDWIDE 5000 2500 Order Now
MOUSER WORLDWIDE 3963 1 Order Now
Farnell Element14 EUROPE 4096 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

21

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4125

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

5000

Min.Order

2500

Region

WORLDWIDE Order Now

MOUSER

Stock

3963

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4096

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-12

Buy Direct
Active
EAR99 NEC Tape And Reel SO-8 -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

KF25BDT-TR Available at 1 distributors

Distributor availability ofKF25BDT-TR

Distributor Name
Region Stock Min. Order Third party link
Farnell Element14 EUROPE 373 1 Order Now

Distributor reported inventory date: 2021-09-11

Distributor Name

Farnell Element14

Stock

373

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-11

Active
EAR99 NEC Tape And Reel DPAK -40 125 2.5 0.4232 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.4232

Country of Origin:

CHINA

KF33BDT-TR Available at 3 distributors

Distributor availability ofKF33BDT-TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1210 5 Order Now
FUTURE WORLDWIDE 308 1 Order Now
MOUSER WORLDWIDE 258 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

RS COMPONENTS

Stock

1210

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

308

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

258

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-09-12

Buy Direct
Active
EAR99 NEC Tape And Reel DPAK -40 125 3.3 0.4232 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Unit Price (US$):

0.4232

Country of Origin:

CHINA

KF33BD-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.368 / 1k

Distributor availability ofKF33BD-TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1045 5 Order Now
Newark Element14 AMERICA 165 0 Order Now
Farnell Element14 EUROPE 20 1 Order Now
ANGLIA Live EUROPE 15952 1 Order Now

Distributor reported inventory date: 2021-09-11

Distributor Name

RS COMPONENTS

Stock

1045

Min.Order

5

Region

EUROPE Order Now

Newark Element14

Stock

165

Min.Order

0

Region

AMERICA Order Now

Farnell Element14

Stock

20

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

15952

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-11

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

0.368 / 1k

Country of Origin

CHINA

KF80BDT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.3944 / 1k

Distributor availability ofKF80BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 494 1 Order Now
RS COMPONENTS EUROPE 2275 1 Order Now
MOUSER WORLDWIDE 791 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

494

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2275

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

791

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-09-12

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

0.3944 / 1k

Country of Origin

CHINA

KF50BDT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.3944 / 1k

Distributor availability ofKF50BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 40219 1 Order Now
RS COMPONENTS EUROPE 2695 5 Order Now
Newark Element14 AMERICA 30 0 Order Now
MOUSER WORLDWIDE 3059 1 Order Now
Farnell Element14 EUROPE 533 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

40219

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2695

Min.Order

5

Region

EUROPE Order Now

Newark Element14

Stock

30

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

3059

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

533

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-12

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

0.3944 / 1k

Country of Origin

CHINA

KF50BD-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.368 / 1k

Distributor availability ofKF50BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1876 1 Order Now
RS COMPONENTS EUROPE 5800 1 Order Now
Farnell Element14 EUROPE 2164 1 Order Now
ANGLIA Live EUROPE 23640 1 Order Now

Distributor reported inventory date: 2021-09-11

Distributor Name

DIGIKEY

Stock

1876

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

5800

Min.Order

1

Region

EUROPE Order Now

Farnell Element14

Stock

2164

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

23640

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-11

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

0.368 / 1k

Country of Origin

CHINA

KF25BD-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.368 / 1k

Distributor availability ofKF25BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 21 1 Order Now
RS COMPONENTS EUROPE 4125 1 Order Now
FUTURE WORLDWIDE 5000 2500 Order Now
MOUSER WORLDWIDE 3963 1 Order Now
Farnell Element14 EUROPE 4096 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

DIGIKEY

Stock

21

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4125

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

5000

Min.Order

2500

Region

WORLDWIDE Order Now

MOUSER

Stock

3963

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4096

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-12

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

0.368 / 1k

Country of Origin

CHINA

KF25BDT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.4232 / 1k

Distributor availability ofKF25BDT-TR

Distributor Name
Region Stock Min. Order Third party link
Farnell Element14 EUROPE 373 1 Order Now

Distributor reported inventory date: 2021-09-11

Distributor Name

Farnell Element14

Stock

373

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-09-11

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

0.4232 / 1k

Country of Origin

CHINA

KF33BDT-TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.4232 / 1k

Distributor availability ofKF33BDT-TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1210 5 Order Now
FUTURE WORLDWIDE 308 1 Order Now
MOUSER WORLDWIDE 258 1 Order Now

Distributor reported inventory date: 2021-09-12

Distributor Name

RS COMPONENTS

Stock

1210

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

308

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

258

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-09-12

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

0.4232 / 1k

Country of Origin

CHINA

(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors