KFXX

Active

Very low drop voltage regulators with inhibit

Download datasheet Order Direct
Overview
Online design
Sample & Buy
Solutions
Documentation
CAD Resources
Tools & Software
Quality & Reliability
Get Started
Partner products
Sales Briefcase

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

Recommended for you

Related Applications

Smart Farming

EDA Symbols, Footprints and 3D Models

STMicroelectronics - KFXX

Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.

Symbols

Symbols

Footprints

Footprints

3D model

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

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 8 distributors

Distributor availability ofKF33BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1806 1 Order Now
COMPEL EUROPE 6253 1 Order Now
RS COMPONENTS EUROPE 4755 5 Order Now
AVNET AMERICA 2500 0 Order Now
Newark Element14 AMERICA 1083 0 Order Now
MOUSER WORLDWIDE 610 1 Order Now
Farnell Element14 EUROPE 3089 1 Order Now
ANGLIA Live EUROPE 8017 1 Order Now

Distributor reported inventory date: 2021-03-05

Distributor Name

DIGIKEY

Stock

1806

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

6253

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

4755

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

610

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3089

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

8017

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-03-05

Buy Direct
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: 2021-03-05

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: 2021-03-05

Buy Direct
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 205 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 3150 1 Order Now
Farnell Element14 EUROPE 2452 1 Order Now

Distributor reported inventory date: 2021-03-05

Distributor Name

DIGIKEY

Stock

205

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

3150

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2452

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-03-05

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 2082 1 Order Now
COMPEL EUROPE 18713 1 Order Now
RS COMPONENTS EUROPE 11180 1 Order Now
MOUSER WORLDWIDE 4078 1 Order Now
Farnell Element14 EUROPE 4411 1 Order Now
ANGLIA Live EUROPE 29676 1 Order Now

Distributor reported inventory date: 2021-03-05

Distributor Name

DIGIKEY

Stock

2082

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

18713

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

11180

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

4078

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4411

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

29676

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-03-05

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 2212 1 Order Now

Distributor reported inventory date: 2021-03-05

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

2212

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-03-05

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 1446 1 Order Now

Distributor reported inventory date: 2021-03-05

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

1446

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-03-05

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 9255 1 Order Now
COMPEL EUROPE 362 1 Order Now
RS COMPONENTS EUROPE 11625 5 Order Now
AVNET AMERICA 1820 0 Order Now
FUTURE WORLDWIDE 308 1 Order Now
MOUSER WORLDWIDE 5781 1 Order Now
Farnell Element14 EUROPE 4847 1 Order Now

Distributor reported inventory date: 2021-03-05

Distributor Name

DIGIKEY

Stock

9255

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

362

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

11625

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

1820

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

308

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

5781

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4847

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-03-05

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 1806 1 Order Now
COMPEL EUROPE 6253 1 Order Now
RS COMPONENTS EUROPE 4755 5 Order Now
AVNET AMERICA 2500 0 Order Now
Newark Element14 AMERICA 1083 0 Order Now
MOUSER WORLDWIDE 610 1 Order Now
Farnell Element14 EUROPE 3089 1 Order Now
ANGLIA Live EUROPE 8017 1 Order Now

Distributor reported inventory date: 2021-03-05

Distributor Name

DIGIKEY

Stock

1806

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

6253

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

4755

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

610

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3089

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

8017

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-03-05

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: 2021-03-05

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: 2021-03-05

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 205 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 3150 1 Order Now
Farnell Element14 EUROPE 2452 1 Order Now

Distributor reported inventory date: 2021-03-05

Distributor Name

DIGIKEY

Stock

205

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

3150

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2452

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-03-05

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 2082 1 Order Now
COMPEL EUROPE 18713 1 Order Now
RS COMPONENTS EUROPE 11180 1 Order Now
MOUSER WORLDWIDE 4078 1 Order Now
Farnell Element14 EUROPE 4411 1 Order Now
ANGLIA Live EUROPE 29676 1 Order Now

Distributor reported inventory date: 2021-03-05

Distributor Name

DIGIKEY

Stock

2082

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

18713

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

11180

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

4078

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4411

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

29676

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-03-05

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 2212 1 Order Now

Distributor reported inventory date: 2021-03-05

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

2212

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-03-05

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 1446 1 Order Now

Distributor reported inventory date: 2021-03-05

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

1446

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-03-05

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 9255 1 Order Now
COMPEL EUROPE 362 1 Order Now
RS COMPONENTS EUROPE 11625 5 Order Now
AVNET AMERICA 1820 0 Order Now
FUTURE WORLDWIDE 308 1 Order Now
MOUSER WORLDWIDE 5781 1 Order Now
Farnell Element14 EUROPE 4847 1 Order Now

Distributor reported inventory date: 2021-03-05

Distributor Name

DIGIKEY

Stock

9255

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

362

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

11625

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

1820

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

308

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

5781

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4847

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-03-05

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