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STEF12PUR

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Electronic fuse for 12 V line

Quantity $ per Unit Savings
1 - 9$1.740%
10 - 24$1.589%
25 - 50$1.4914%
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$1.74
Parameter NameParameter Value
Operating Temp Min Celsius-40.0
Operating Temp Max Celsius125.0
ECCN USEAR99
ECCN EUNEC
Packing TypeTape And Reel
RoHs compliantEcopack2
GradeIndustrial
Package NameDFN10 3X3

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
  • UL2367 Recognized - File N. E468771