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  • The STEF12 is an integrated electronic fuse optimized for monitoring output current and input voltage. Connected in series to a 12 V rail, it is capable of protecting the electronic circuitry on its output from overcurrent and overvoltage. The device has a controlled delay and turn-on time.

    When an overload condition occurs, the STEF12 limits the output current to a predefined safe value. If the anomalous overload condition persists it goes into an open state, disconnecting the load from the power supply. If a continuous short-circuit is present on the board, when power is re-applied the E-fuse initially limits the output current to a safe value and then again goes into an open state.
    The device is equipped with a thermal protection circuit. The intervention of the thermal protection is signal led to the board monitoring circuits through a signal on the Fault pin.
    Unlike the mechanical fuses, which must be physically replaced after a single event, the Efuse does not degrade in its performance after short-circuit/thermal protection interventions and it is reset either by recycling the supply voltage or using the Enable pin.
    The companion chip for the 5 V power rails is also available with part number STEF05.

    Key Features

    • Continuous current (typ): 3.6 A
    • N-channel on-resistance (typ): 53 mΩ
    • Enable/Fault functions
    • Output clamp voltage (typ): 15 V
    • Undervoltage lockout
    • Short-circuit limit
    • Overload current limit
    • Controlled output voltage ramp
    • Thermal latch (typ): 165 °C
    • Operating junction temp. - 40 °C to 125 °C
    • Available in DFN10 (3x3 mm) package

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Related Applications

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Evaluation Tools

    • Part Number

      5 V and 12 V power line protection based on STEF05 and STEF12 electronic fuses

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS7315
      Electronic fuse for 12 V line
      7.0
      1.67 MB
      PDF
      DS7315

      Electronic fuse for 12 V line

    • Description Version Size Action
      AN4069
      5 V and 12 V power line protection based on STEF05 and STEF12 electronic fuses
      1.1
      807.4 KB
      PDF
      AN4069

      5 V and 12 V power line protection based on STEF05 and STEF12 electronic fuses

    • Description Version Size Action
      AN4069
      5 V and 12 V power line protection based on STEF05 and STEF12 electronic fuses
      1.1
      807.4 KB
      PDF
      AN4069

      5 V and 12 V power line protection based on STEF05 and STEF12 electronic fuses

Publications and Collaterals

    • Description Version Size Action
      Linear and Switching Voltage Regulators Selection Guide 3.0
      370.88 KB
      PDF

      Linear and Switching Voltage Regulators Selection Guide

    • Description Version Size Action
      electronic Fuse quick Reference Guide 1.1
      989.09 KB
      PDF

      electronic Fuse quick Reference Guide

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STEF12PUR
Active
DFN10 3X3 Industrial Ecopack2

STEF12PUR

Package:

DFN10 3X3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN10 3X3

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
Package
Packing Type
Marketing Status
ECCN (US)
Country of Origin
Budgetary Price (US$)*/Qty
STEF12PUR Available at 8 distributors

Distributor availability ofSTEF12PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1929 1 Order Now
COMPEL EUROPE 1 1 Order Now
RS COMPONENTS EUROPE 355 1 Order Now
AVNET AMERICA 9000 0 Order Now
ARROW EUROPE 30000 0 Order Now
Newark Element14 AMERICA 100 0 Order Now
MOUSER WORLDWIDE 4264 1 Order Now
Farnell Element14 EUROPE 25 1 Order Now

Distributor reported inventory date: 2020-07-06

Distributor Name

DIGIKEY

Stock

1929

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

355

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

9000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

30000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

100

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

4264

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

25

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-06

Get sample DFN10 3X3 Tape And Reel
Active
EAR99 CHINA 0.596 / 1k

STEF12PUR

Package

DFN10 3X3

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.596 / 1k

Distributor availability ofSTEF12PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1929 1 Order Now
COMPEL EUROPE 1 1 Order Now
RS COMPONENTS EUROPE 355 1 Order Now
AVNET AMERICA 9000 0 Order Now
ARROW EUROPE 30000 0 Order Now
Newark Element14 AMERICA 100 0 Order Now
MOUSER WORLDWIDE 4264 1 Order Now
Farnell Element14 EUROPE 25 1 Order Now

Distributor reported inventory date: 2020-07-06

Distributor Name

DIGIKEY

Stock

1929

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

355

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

9000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

30000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

100

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

4264

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

25

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-06

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.596 / 1k

ECCN (US)

EAR99

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