Electronic fuse for 3.3 V and 5 V lines
Packing TypeTape And Reel
ROHS Compliance GradeEcopack2
Package NameDFN10 3X3
Key Features
  • Power MOSFET on-resistance (typ.): 40 mΩ
  • Enable function
  • Output clamp voltage (typ.): 5.7 V in 5 V mode, and 3.8 V in 3.3 V mode
  • Undervoltage lockout
  • Short-circuit limit
  • Overload foldback current limit
  • Controlled soft-start
  • Thermal auto-retry
  • Internal sensing FET
  • Operative temp. range: - 40 °C to 85 °C
  • Available in DFN 3x3 10L package
  • Hard disk drives
  • Solid state drives (SSD)
  • Hard disk and SSD arrays
  • Set-top boxes
  • DVD and blu-ray disc drivers

The STEF4S is an integrated electronic fuse optimized for monitoring the output current and the input voltage. It can be connected in series to 3.3 V or 5 V rails, protecting the electronic circuitry on its output from overcurrent and overvoltage. The operating mode (5 V or 3.3 V) can be selected by a dedicated pin. The STEF4S has a controlled turn-on time, adjustable by an external capacitor. When an overload condition occurs the device 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, the E-fuse limits the output current to a safe value.

In case of overvoltage on the input, the device clamps the output voltage to a predefined value and protects the load.

If the anomalous fault condition persists, the internal thermal protection circuit shuts down the device and then automatically attempts to re-supply the load until the fault condition is removed.

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.

In stock:
Range Unit Price Savings
1 - 9$1.510%
10 - 99$1.2716%
100 - 499$0.9041%
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