KFXX

Active
Design Win

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

EDA Symbols, Footprints and 3D Models

STMicroelectronics - KFXX

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Symbols

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Footprints

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3D models

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

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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$)*/Qty
Output Tolerance (typ)
Output Current (A) (nom)
Unit Price (US$)
Country of Origin
min
max
KF33BD-TR Available at 6 distributors

Distributor availability ofKF33BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6728 1 Buy from Distributor
COMPEL EUROPE 3991 1 Buy from Distributor
RS COMPONENTS EUROPE 1230 5 Buy from Distributor
AVNET AMERICA 2500 0 Buy from Distributor
Newark Element14 AMERICA 270 0 Buy from Distributor
ANGLIA Live EUROPE 20570 1 Buy from Distributor

Distributor reported inventory date: 2022-07-28

Distributor Name

DIGIKEY

Stock

6728

Min.Order

1

Region

WORLDWIDE Buy from Distributor

COMPEL

Stock

3991

Min.Order

1

RS COMPONENTS

Stock

1230

Min.Order

5

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Buy from Distributor

Newark Element14

Stock

270

Min.Order

0

Region

AMERICA Buy from Distributor

ANGLIA Live

Stock

20570

Min.Order

1

Distributor reported inventory date: 2022-07-28

Active
EAR99 NEC Tape and Reel SO-8 -40 125 3.3

2

0.5

0.4879

CHINA

KF80BDT-TR Available at 4 distributors

Distributor availability ofKF80BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2500 1 Buy from Distributor
RS COMPONENTS EUROPE 1221 1 Buy from Distributor
AVNET AMERICA 20000 0 Buy from Distributor
MOUSER WORLDWIDE 785 1 Buy from Distributor

Distributor reported inventory date: 2022-07-28

Distributor Name

DIGIKEY

Stock

2500

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

1221

Min.Order

1

AVNET

Stock

20000

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

785

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-07-28

Active
EAR99 NEC Tape and Reel DPAK -40 125 8

2

0.5

0.5157

CHINA

KF50BDT-TR Available at 3 distributors

Distributor availability ofKF50BDT-TR

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 442 1 Buy from Distributor
RS COMPONENTS EUROPE 70 5 Buy from Distributor
Newark Element14 AMERICA 29 0 Buy from Distributor

Distributor reported inventory date: 2022-07-28

Distributor Name

COMPEL

Stock

442

Min.Order

1

RS COMPONENTS

Stock

70

Min.Order

5

Newark Element14

Stock

29

Min.Order

0

Region

AMERICA Buy from Distributor

Distributor reported inventory date: 2022-07-28

Active
EAR99 NEC Tape and Reel DPAK -40 125 5

2

0.5

0.5157

CHINA

KF50BD-TR Available at 4 distributors

Distributor availability ofKF50BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2228 1 Buy from Distributor
COMPEL EUROPE 17 1 Buy from Distributor
RS COMPONENTS EUROPE 125 1 Buy from Distributor
ANGLIA Live EUROPE 7949 1 Buy from Distributor

Distributor reported inventory date: 2022-07-28

Distributor Name

DIGIKEY

Stock

2228

Min.Order

1

Region

WORLDWIDE Buy from Distributor

COMPEL

Stock

17

Min.Order

1

RS COMPONENTS

Stock

125

Min.Order

1

ANGLIA Live

Stock

7949

Min.Order

1

Distributor reported inventory date: 2022-07-28

Active
EAR99 NEC Tape and Reel SO-8 -40 125 5

2

0.5

0.4879

CHINA

KF25BD-TR Available at 4 distributors

Distributor availability ofKF25BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2514 1 Buy from Distributor
RS COMPONENTS EUROPE 3415 1 Buy from Distributor
MOUSER WORLDWIDE 4248 1 Buy from Distributor
Farnell Element14 EUROPE 7375 1 Buy from Distributor

Distributor reported inventory date: 2022-07-28

Distributor Name

DIGIKEY

Stock

2514

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

3415

Min.Order

1

MOUSER

Stock

4248

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

7375

Min.Order

1

Distributor reported inventory date: 2022-07-28

Active
EAR99 NEC Tape and Reel SO-8 -40 125 2.5

2

0.5

0.4879

CHINA

KF25BDT-TR Available at 4 distributors

Distributor availability ofKF25BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2478 1 Buy from Distributor
COMPEL EUROPE 743 1 Buy from Distributor
MOUSER WORLDWIDE 3203 1 Buy from Distributor
Farnell Element14 EUROPE 1348 1 Buy from Distributor

Distributor reported inventory date: 2022-07-28

Distributor Name

DIGIKEY

Stock

2478

Min.Order

1

Region

WORLDWIDE Buy from Distributor

COMPEL

Stock

743

Min.Order

1

MOUSER

Stock

3203

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

1348

Min.Order

1

Distributor reported inventory date: 2022-07-28

Active
EAR99 NEC Tape and Reel DPAK -40 125 2.5

2

0.5

0.4879

CHINA

KF33BDT-TR Available at 1 distributors

Distributor availability ofKF33BDT-TR

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 4522 1 Buy from Distributor

Distributor reported inventory date: 2022-07-26

Distributor Name

COMPEL

Stock

4522

Min.Order

1

Distributor reported inventory date: 2022-07-26

Active
EAR99 NEC Tape and Reel DPAK -40 125 3.3

2

0.5

0.5157

CHINA

KF33BD-TR Active

Package:
SO-8
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

KF33BD-TR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Output Voltage (V) (nom):

3.3

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Country of Origin:

CHINA

Distributor availability ofKF33BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6728 1 Buy from Distributor
COMPEL EUROPE 3991 1 Buy from Distributor
RS COMPONENTS EUROPE 1230 5 Buy from Distributor
AVNET AMERICA 2500 0 Buy from Distributor
Newark Element14 AMERICA 270 0 Buy from Distributor
ANGLIA Live EUROPE 20570 1 Buy from Distributor

Distributor reported inventory date: 2022-07-28

Distributor Name

DIGIKEY

Stock

6728

Min.Order

1

Region

WORLDWIDE Buy from Distributor

COMPEL

Stock

3991

Min.Order

1

RS COMPONENTS

Stock

1230

Min.Order

5

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Buy from Distributor

Newark Element14

Stock

270

Min.Order

0

Region

AMERICA Buy from Distributor

ANGLIA Live

Stock

20570

Min.Order

1

Distributor reported inventory date: 2022-07-28

KF80BDT-TR Active

Package:
DPAK
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

KF80BDT-TR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Output Voltage (V) (nom):

8

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Country of Origin:

CHINA

Distributor availability ofKF80BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2500 1 Buy from Distributor
RS COMPONENTS EUROPE 1221 1 Buy from Distributor
AVNET AMERICA 20000 0 Buy from Distributor
MOUSER WORLDWIDE 785 1 Buy from Distributor

Distributor reported inventory date: 2022-07-28

Distributor Name

DIGIKEY

Stock

2500

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

1221

Min.Order

1

AVNET

Stock

20000

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

785

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-07-28

KF50BDT-TR Active

Package:
DPAK
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

KF50BDT-TR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Output Voltage (V) (nom):

5

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Country of Origin:

CHINA

Distributor availability ofKF50BDT-TR

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 442 1 Buy from Distributor
RS COMPONENTS EUROPE 70 5 Buy from Distributor
Newark Element14 AMERICA 29 0 Buy from Distributor

Distributor reported inventory date: 2022-07-28

Distributor Name

COMPEL

Stock

442

Min.Order

1

RS COMPONENTS

Stock

70

Min.Order

5

Newark Element14

Stock

29

Min.Order

0

Region

AMERICA Buy from Distributor

Distributor reported inventory date: 2022-07-28

KF50BD-TR Active

Package:
SO-8
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

KF50BD-TR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Output Voltage (V) (nom):

5

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Country of Origin:

CHINA

Distributor availability ofKF50BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2228 1 Buy from Distributor
COMPEL EUROPE 17 1 Buy from Distributor
RS COMPONENTS EUROPE 125 1 Buy from Distributor
ANGLIA Live EUROPE 7949 1 Buy from Distributor

Distributor reported inventory date: 2022-07-28

Distributor Name

DIGIKEY

Stock

2228

Min.Order

1

Region

WORLDWIDE Buy from Distributor

COMPEL

Stock

17

Min.Order

1

RS COMPONENTS

Stock

125

Min.Order

1

ANGLIA Live

Stock

7949

Min.Order

1

Distributor reported inventory date: 2022-07-28

KF25BD-TR Active

Package:
SO-8
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

KF25BD-TR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Output Voltage (V) (nom):

2.5

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Country of Origin:

CHINA

Distributor availability ofKF25BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2514 1 Buy from Distributor
RS COMPONENTS EUROPE 3415 1 Buy from Distributor
MOUSER WORLDWIDE 4248 1 Buy from Distributor
Farnell Element14 EUROPE 7375 1 Buy from Distributor

Distributor reported inventory date: 2022-07-28

Distributor Name

DIGIKEY

Stock

2514

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

3415

Min.Order

1

MOUSER

Stock

4248

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

7375

Min.Order

1

Distributor reported inventory date: 2022-07-28

KF25BDT-TR Active

Package:
DPAK
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

KF25BDT-TR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Output Voltage (V) (nom):

2.5

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Country of Origin:

CHINA

Distributor availability ofKF25BDT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2478 1 Buy from Distributor
COMPEL EUROPE 743 1 Buy from Distributor
MOUSER WORLDWIDE 3203 1 Buy from Distributor
Farnell Element14 EUROPE 1348 1 Buy from Distributor

Distributor reported inventory date: 2022-07-28

Distributor Name

DIGIKEY

Stock

2478

Min.Order

1

Region

WORLDWIDE Buy from Distributor

COMPEL

Stock

743

Min.Order

1

MOUSER

Stock

3203

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

1348

Min.Order

1

Distributor reported inventory date: 2022-07-28

KF33BDT-TR Active

Package:
DPAK
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

KF33BDT-TR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Output Voltage (V) (nom):

3.3

Output Tolerance (typ):

2

Output Current (A) (nom):

0.5

Country of Origin:

CHINA

Distributor availability ofKF33BDT-TR

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 4522 1 Buy from Distributor

Distributor reported inventory date: 2022-07-26

Distributor Name

COMPEL

Stock

4522

Min.Order

1

Distributor reported inventory date: 2022-07-26

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(*) 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