STEF4S

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Electronic fuse for 3.3 V and 5 V lines

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Product overview

Description

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.

  • All 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

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STMicroelectronics - STEF4S

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STEF4SPUR
Active
DFN10 3X3 Industrial Ecopack2

STEF4SPUR

Package:

DFN10 3X3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN10 3X3

Grade

Industrial

RoHS Compliance Grade

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.

Sample & Buy

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STEF4SPUR Available at distributors

Distributor availability of STEF4SPUR

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Active
EAR99 NEC Tape and Reel DFN10 3X3 - - CHINA

STEF4SPUR Active

Package:
DFN10 3X3
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

STEF4SPUR

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-

Max:

-

Country of Origin:

CHINA

Distributor Name

Distributor reported inventory date:

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(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors