KFXX

Active

Very low drop voltage regulators with inhibit

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CAD Resources
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Quality & Reliability
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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

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 4 distributors

Distributor availability ofKF33BD-TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 435 5 Buy from Distributor
Newark Element14 AMERICA 6 0 Buy from Distributor
Farnell Element14 EUROPE 20 1 Buy from Distributor
ANGLIA Live EUROPE 15352 1 Buy from Distributor

Distributor reported inventory date: 2021-10-23

Distributor Name

RS COMPONENTS

Stock

435

Min.Order

5

Newark Element14

Stock

6

Min.Order

0

Region

AMERICA Buy from Distributor

Farnell Element14

Stock

20

Min.Order

1

ANGLIA Live

Stock

15352

Min.Order

1

Distributor reported inventory date: 2021-10-23

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 1 distributors

Distributor availability ofKF80BDT-TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 2275 1 Buy from Distributor

Distributor reported inventory date: 2021-10-18

Distributor Name

RS COMPONENTS

Stock

2275

Min.Order

1

Distributor reported inventory date: 2021-10-18

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 1834 1 Buy from Distributor
RS COMPONENTS EUROPE 2530 5 Buy from Distributor
Newark Element14 AMERICA 30 0 Buy from Distributor
MOUSER WORLDWIDE 2581 1 Buy from Distributor
Farnell Element14 EUROPE 153 1 Buy from Distributor

Distributor reported inventory date: 2021-10-23

Distributor Name

DIGIKEY

Stock

1834

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

2530

Min.Order

5

Newark Element14

Stock

30

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

2581

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

153

Min.Order

1

Distributor reported inventory date: 2021-10-23

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 3 distributors

Distributor availability ofKF50BD-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3785 1 Buy from Distributor
RS COMPONENTS EUROPE 5510 1 Buy from Distributor
ANGLIA Live EUROPE 23348 1 Buy from Distributor

Distributor reported inventory date: 2021-10-23

Distributor Name

DIGIKEY

Stock

3785

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

5510

Min.Order

1

ANGLIA Live

Stock

23348

Min.Order

1

Distributor reported inventory date: 2021-10-23

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 Buy from Distributor
RS COMPONENTS EUROPE 4125 1 Buy from Distributor
FUTURE WORLDWIDE 5000 2500 Buy from Distributor
MOUSER WORLDWIDE 2462 1 Buy from Distributor
Farnell Element14 EUROPE 4095 1 Buy from Distributor

Distributor reported inventory date: 2021-10-23

Distributor Name

DIGIKEY

Stock

21

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

4125

Min.Order

1

FUTURE

Stock

5000

Min.Order

2500

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

2462

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

4095

Min.Order

1

Distributor reported inventory date: 2021-10-23

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
MOUSER WORLDWIDE 3740 1 Buy from Distributor

Distributor reported inventory date: 2021-10-23

Distributor Name

MOUSER

Stock

3740

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-23

Buy Direct
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 1 distributors

Distributor availability ofKF33BDT-TR

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 390 5 Buy from Distributor

Distributor reported inventory date: 2021-10-18

Distributor Name

RS COMPONENTS

Stock

390

Min.Order

5

Distributor reported inventory date: 2021-10-18

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 435 5 Buy from Distributor
Newark Element14 AMERICA 6 0 Buy from Distributor
Farnell Element14 EUROPE 20 1 Buy from Distributor
ANGLIA Live EUROPE 15352 1 Buy from Distributor

Distributor reported inventory date: 2021-10-23

Distributor Name

RS COMPONENTS

Stock

435

Min.Order

5

Newark Element14

Stock

6

Min.Order

0

Region

AMERICA Buy from Distributor

Farnell Element14

Stock

20

Min.Order

1

ANGLIA Live

Stock

15352

Min.Order

1

Distributor reported inventory date: 2021-10-23

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
RS COMPONENTS EUROPE 2275 1 Buy from Distributor

Distributor reported inventory date: 2021-10-18

Distributor Name

RS COMPONENTS

Stock

2275

Min.Order

1

Distributor reported inventory date: 2021-10-18

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 1834 1 Buy from Distributor
RS COMPONENTS EUROPE 2530 5 Buy from Distributor
Newark Element14 AMERICA 30 0 Buy from Distributor
MOUSER WORLDWIDE 2581 1 Buy from Distributor
Farnell Element14 EUROPE 153 1 Buy from Distributor

Distributor reported inventory date: 2021-10-23

Distributor Name

DIGIKEY

Stock

1834

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

2530

Min.Order

5

Newark Element14

Stock

30

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

2581

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

153

Min.Order

1

Distributor reported inventory date: 2021-10-23

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 3785 1 Buy from Distributor
RS COMPONENTS EUROPE 5510 1 Buy from Distributor
ANGLIA Live EUROPE 23348 1 Buy from Distributor

Distributor reported inventory date: 2021-10-23

Distributor Name

DIGIKEY

Stock

3785

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

5510

Min.Order

1

ANGLIA Live

Stock

23348

Min.Order

1

Distributor reported inventory date: 2021-10-23

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 Buy from Distributor
RS COMPONENTS EUROPE 4125 1 Buy from Distributor
FUTURE WORLDWIDE 5000 2500 Buy from Distributor
MOUSER WORLDWIDE 2462 1 Buy from Distributor
Farnell Element14 EUROPE 4095 1 Buy from Distributor

Distributor reported inventory date: 2021-10-23

Distributor Name

DIGIKEY

Stock

21

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

4125

Min.Order

1

FUTURE

Stock

5000

Min.Order

2500

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

2462

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

4095

Min.Order

1

Distributor reported inventory date: 2021-10-23

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
MOUSER WORLDWIDE 3740 1 Buy from Distributor

Distributor reported inventory date: 2021-10-23

Distributor Name

MOUSER

Stock

3740

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-23

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 390 5 Buy from Distributor

Distributor reported inventory date: 2021-10-18

Distributor Name

RS COMPONENTS

Stock

390

Min.Order

5

Distributor reported inventory date: 2021-10-18

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