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  • The STEF05 is an integrated electronic fuse optimized for monitoring output current and input voltage. Connected in series to a 5 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 STEF05 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 signalled to the board monitoring circuits through a signal on the Fault pin. Unlike mechanical fuses, which must be physically replaced after a single event, the E-fuse 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 12 V power rails is also available with part number STEF12.

    Key Features

    • Continuous current (typ): 3.6 A
    • N-channel on-resistance (typ): 40 mΩ
    • Enable/Fault functions
    • Output clamp voltage (typ): 6.65 V
    • Undervoltage lockout
    • Short-circuit limit
    • Overload current limit
    • Controlled output voltage ramp
    • Thermal latch (typ): 165 °C
    • Uses tiny capacitors
    • Operating junction temp. - 40 °C to 125 °C
    • Available in DFN10 (3x3 mm) package

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Related Applications

Computers and Peripherals

Data Center

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
      DS7314
      Electronic fuse for 5 V line
      5.0
      1.29 MB
      PDF
      DS7314

      Electronic fuse for 5 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**
STEF05PUR
Active
DFN10 3X3 Industrial Ecopack2

STEF05PUR

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
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
STEF05PUR Available at 2 distributors

Distributor availability ofSTEF05PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4930 1 Order Now
MOUSER WORLDWIDE 4681 1 Order Now

Distributor reported inventory date: 2020-09-23

Distributor Name

DIGIKEY

Stock

4930

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

4681

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-09-23

Sample & Buy Buy now
Active
EAR99 NEC Tape And Reel DFN10 3X3 -40 125 CHINA 0.596 / 1k

STEF05PUR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.596 / 1k

Distributor availability ofSTEF05PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4930 1 Order Now
MOUSER WORLDWIDE 4681 1 Order Now

Distributor reported inventory date: 2020-09-23

Distributor Name

DIGIKEY

Stock

4930

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

4681

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-09-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DFN10 3X3

Operating Temperature (°C)

(min)

-40

(max)

125

Budgetary Price (US$)* / Qty

0.596 / 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