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STEF05

Electronic fuse for 5 V line
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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.

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Errata Sheet
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Datasheet

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

Design Resources

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Technical Documentation

Product Specifications

Description Version Size
pdf
DS7314: Electronic fuse for 5 V line
5.0 1,319 KB

Application Notes

Description Version Size
pdf
AN4069: 5 V and 12 V power line protection based on STEF05 and STEF12 electronic fuses
1.1 807 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STEVAL-IFP021V1 5 V and 12 V power line protection based on STEF05 and STEF12 electronic fuses

Sample & Buy

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Part Number Marketing StatusPackagePacking TypeAutomotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEF05PURActiveVDFPN 10 3x3x1.0Tape And Reel_Free Samples.84Distributor reported inventory date: 2014-10-25
Distributor NameRegionStockMin. order
Farnell Element14Order NowEUROPE10641
DIGIKEYOrder NowWORLDWIDE21961
MOUSEROrder NowWORLDWIDE14831
Ecopack2PDF
XML

(*) 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
(**) 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.
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