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STMicroelectronics Programmable Universal Electronic Fuse Integrates Safety and Reliability features, now available from Anglia

The STEF01 device from STMicroelectronics is a universal integrated programmable electronic fuse optimized for monitoring output current and the input voltage on DC power lines. Sustaining up to 4A continuous current over a wide operating input-voltage range of 8V to 48V, with low insertion loss thanks to its integrated low-RDS(ON) MOSFET, the STEF01 programmable electronic fuse (E-fuse ) from STMicroelectronics extends the benefits of fast-acting overload protection to applications at higher power ratings.

When connected in series to the main power rail, the STEF01 device is able to detect and react to overcurrent and overvoltage conditions. When an overload condition occurs, the device limits the output current to a safe value defined by the user. If the anomalous overload condition persists, the device goes into an open state, disconnecting the load from the power supply.

The device is fully programmable, parameters including current limit, UVLO, overvoltage clamp and start-up time can be set by means of external components. The adjustable turn-on time feature of the STEF01 device is useful for keeping the in-rush current under control during start-up and hot-swap operations. The device can provide either thermal latch or auto-retry protection modes, which are selectable by means of a dedicated pin.

The STEF01 also provides a gate driver pin for an external power MOSFET to implement a reverse-current blocking circuit. The intervention of the thermal protection is signalled to the board monitoring circuits through a signal on the En/Fault pin.

The evaluation board has the STEF01 E-fuse with integrated control circuit and a low on-resistance MOSFET switch and provides a full set of protections, including overcurrent, overvoltage and inrush current. Designers can adjust UVLO threshold, clamping voltage and overload current limits through mechanical trimmers on the evaluation board..
The STEVAL-EFUSE01 evaluation board lets designers easily adjust the output voltage ramp rate at the desired start-up time, by changing the Cdv/dt capacitor. As most applications require a flag to signal that the output voltage is in the correct range, the STEVAL-EFUSE01 also features a PG test point for information about the voltage drop on the pass element. The STEVAL-EFUSE01 also features thermal latch and auto-retry thermal protection modes, selectable through a dedicated jumper configuration.

The STEF01 E-fuse can be used to replace traditional circuit protection fuses in a wide range of applications including Industrial Control Equipment, Lighting, HVAC, Building Automation, Communications and Power Supplies.

Key Features & Specifications


  • Operating input voltage range: 8 to 48 V
  • Absolute maximum input voltage: 55 V
  • Continuous current typ.: 4 A
  • N-channel on-resistance typ.: 30 mΩ
  • Enable/fault functions
  • Output clamp voltage: adjustable from 10 to 52 V
  • Programmable undervoltage lockout
  • Short-circuit current limit
  • Programmable overload current limit
  • Adjustable soft-start time
  • Latch or auto-retry thermal protection
  • Maximum allowable power protection
  • Power Good
  • Drives an optional external reverse current protection MOSFET
  • Operating junction temperature -40 °C to 125 °C
  • HTSSOP14 package


Click here for more information or to buy from Anglia Live.

Click here to download the STEF01 datasheet.

Click here to download the STEVAL-EFUSE01 Evaluation Board databrief.

Anglia are offering customers a FREE evaluation board and samples of the STEF01 Programmable Universal Electronic Fuse from STMicroelectronics, please fill in the form below to register for your FREE samples now.




To register for a FREE evaluation board and samples of the STEF01 Programmable Universal Electronic Fuse from STMicroelectronics, please fill in the form below.

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FREE samples for UK and Ireland customers only, subject to availability.

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