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

The STEVAL-IFP021V1 demonstration board is based on the STEF05 and STEF12 electronic fuses (E-Fuses).

It is designed to help users evaluate the benefit of the complete protection offered by the E-Fuse family and to customize their own application.

The E-Fuse family of hot-swap converters is designed to replace the mechanical fuses on low voltage power lines.

The STEF05 and STEF12 are integrated electronic fuses optimized for monitoring output current and input voltage.

Connected in series to the 5 V/12 V rails, they are capable of protecting the electronic circuitry on the output from overcurrent and overvoltage.

The turn-on time is programmable by means of an external capacitor, allowing control of the inrush current at startup and during hot-swaps.

When an overload condition occurs, the E-Fuse 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.

Both devices are equipped with a thermal protection circuit.

The intervention of the thermal protection is signaled to the board monitoring circuits through a signal on the enable/fault pin that can be connected to other parts belonging to the same family to cause a simultaneous shutdown during failure events.

Unlike mechanical fuses, which must be physically replaced after a single event, E-Fuses do not degrade in their performance after short-circuit/thermal protection interventions and can be reset either by re-cycling the supply voltage or by using the enable pin.

Key Features

  • Input voltages: 5 V and 12 V
  • Continuous current: 3.6 A (typ.) each
  • Adjustable slew rate for output voltage
  • Overvoltage clamp
  • Undervoltage lockout
  • Programmable short-circuit current limit
  • Overload current limit
  • Controlled output voltage ramp
  • Thermal latch protection
  • Fault condition flag
  • Enable pin
  • RoHS compliant




Technical Documentation

Product Specifications
Description Version Size
DB1521 DB1521: 5 V and 12 V power line protection based on STEF05 and STEF12 electronic fuses 1.1 164 KB
Application Notes
Description Version Size
AN4069 AN4069: 5 V and 12 V power line protection based on STEF05 and STEF12 electronic fuses 1.1 807 KB

Hardware Resources

Board Manufacturing Specifications
Description Version Size
STEVAL-IFP021V1 gerber files 3.1 112 KB
Bill of Materials
Description Version Size
Schematic Pack
Description Version Size
STEVAL-IFP021V1 schematics 1.0 23 KB

Publications and Collaterals

Description Version Size
Products and Solutions for Factory Automation and Control 2.0 3 MB


License Agreement
Description Version Size
Evaluation products license agreement 1.4 128 KB
Support & Community

Sample & Buy

Part Number Core Product Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors

(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STEVAL-IFP021V1 ActiveCARD-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.