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  • The L4971 is a step down monolithic power switching regulator delivering 1.5A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25Ω) to obtain very high efficency and high switching speed.

    A switching frequency up to 300KHz is achievable (the maximum power dissipation of the packages must be observed).
    A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 50V cover the majority of today’s applications.
    Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, soft-start, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown.
    The device is available in plastic dual in line, DIP8 for standard assembly, and SO16W for SMD assembly.

    Key Features

    • PROTECTION AGAINST FEEDBACK DISCONNECTION
    • INHIBIT FOR ZERO CURRENT CONSUMPTION
    • SOFT START FUNCTION
    • THERMAL SHUTDOWN
    • ZERO LOAD CURRENT OPERATION
    • VOLTAGE FEEDFORWARD
    • UP TO 1.5A STEP DOWN CONVERTER
    • PRECISE 3.3V (±1%) INTERNAL REFERENCE VOLTAGE
    • OPERATING INPUT VOLTAGE FROM 8V TO 55V
    • SWITCHING FREQUENCY ADJUSTABLE UP TO 300KHz
    • INTERNAL CURRENT LIMITING (PULSE-BY PULSE AND HICCUP MODE)
    • OUTPUT VOLTAGE ADJUSTABLE FROM 3.3V TO 50V

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All tools & software

    • Part number
      Status
      Description
      Type
      Supplier

      STEVAL-ISA202V1

      Active

      1.5 A step down switching regulator (VIN = 8 to 55 V) based on L4971

      PSU and Converter Solution Eval Boards ST
      STEVAL-ISA202V1

      Description:

      1.5 A step down switching regulator (VIN = 8 to 55 V) based on L4971

EDA Symbols, Footprints and 3D Models

STMicroelectronics - L4971

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L4971
Active
DIP-8 Industrial Ecopack2
L4971D
Active
SO-16W Industrial Ecopack1
L4971D013TR
Active
SO-16W Industrial Ecopack1

L4971

Package:

DIP-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DIP-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4971D

Package:

SO-16W

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-16W

Grade

Industrial

RoHS Compliance Grade

Ecopack1

L4971D013TR

Package:

SO-16W

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-16W

Grade

Industrial

RoHS Compliance Grade

Ecopack1

(**) 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.

eDesignSuite

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output

V This option is required and must be a number.
A This option is required and must be a number.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
L4971 Available at 7 distributors

Distributor availability ofL4971

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1898 1 Order Now
COMPEL EUROPE 315 1 Order Now
RS COMPONENTS EUROPE 2349 1 Order Now
AVNET AMERICA 5332 0 Order Now
ARROW EUROPE 29480 0 Order Now
MOUSER WORLDWIDE 3436 1 Order Now
ANGLIA Live EUROPE 32200 50 Order Now

Distributor reported inventory date: 2020-10-27

Distributor Name

DIGIKEY

Stock

1898

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

315

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

2349

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

5332

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

29480

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

3436

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

32200

Min.Order

50

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-27

Free Sample Buy Direct
Active
EAR99 NEC Tube DIP-8 - - CHINA 1.185 / 1k
L4971D Available at 7 distributors

Distributor availability ofL4971D

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 41 1 Order Now
COMPEL EUROPE 29 1 Order Now
RS COMPONENTS EUROPE 320 1 Order Now
FUTURE WORLDWIDE 1368 1 Order Now
ARROW EUROPE 227 0 Order Now
MOUSER WORLDWIDE 1975 1 Order Now
Farnell Element14 EUROPE 1044 1 Order Now

Distributor reported inventory date: 2020-10-27

Distributor Name

DIGIKEY

Stock

41

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

29

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

320

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

1368

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

227

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1975

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1044

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-27

Buy Direct
Active
EAR99 NEC Tube SO-16W - - MALAYSIA 1.354 / 1k
L4971D013TR Available at 3 distributors

Distributor availability ofL4971D013TR

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 2226 1 Order Now
AVNET AMERICA 25000 0 Order Now
Farnell Element14 EUROPE 649 1 Order Now

Distributor reported inventory date: 2020-10-27

Distributor Name

COMPEL

Stock

2226

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

25000

Min.Order

0

Region

AMERICA Order Now

Farnell Element14

Stock

649

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-27

Active
EAR99 NEC Tape And Reel SO-16W - - MALAYSIA 1.354 / 1k

L4971

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.185 / 1k

Distributor availability ofL4971

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1898 1 Order Now
COMPEL EUROPE 315 1 Order Now
RS COMPONENTS EUROPE 2349 1 Order Now
AVNET AMERICA 5332 0 Order Now
ARROW EUROPE 29480 0 Order Now
MOUSER WORLDWIDE 3436 1 Order Now
ANGLIA Live EUROPE 32200 50 Order Now

Distributor reported inventory date: 2020-10-27

Distributor Name

DIGIKEY

Stock

1898

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

315

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

2349

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

5332

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

29480

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

3436

Min.Order

1

Region

WORLDWIDE Order Now

ANGLIA Live

Stock

32200

Min.Order

50

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-27

ECCN (EU)

NEC

Packing Type

Tube

Package

DIP-8

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

1.185 / 1k

Country of Origin

CHINA

L4971D

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.354 / 1k

Distributor availability ofL4971D

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 41 1 Order Now
COMPEL EUROPE 29 1 Order Now
RS COMPONENTS EUROPE 320 1 Order Now
FUTURE WORLDWIDE 1368 1 Order Now
ARROW EUROPE 227 0 Order Now
MOUSER WORLDWIDE 1975 1 Order Now
Farnell Element14 EUROPE 1044 1 Order Now

Distributor reported inventory date: 2020-10-27

Distributor Name

DIGIKEY

Stock

41

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

29

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

320

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

1368

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

227

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1975

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1044

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-27

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-16W

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

1.354 / 1k

Country of Origin

MALAYSIA

L4971D013TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.354 / 1k

Distributor availability ofL4971D013TR

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 2226 1 Order Now
AVNET AMERICA 25000 0 Order Now
Farnell Element14 EUROPE 649 1 Order Now

Distributor reported inventory date: 2020-10-27

Distributor Name

COMPEL

Stock

2226

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

25000

Min.Order

0

Region

AMERICA Order Now

Farnell Element14

Stock

649

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-27

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-16W

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

1.354 / 1k

Country of Origin

MALAYSIA

(*) 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