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  • 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.

    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

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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

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
STEF4SPUR Available at 3 distributors

Distributor availability ofSTEF4SPUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4463 1 Order Now
MOUSER WORLDWIDE 3767 1 Order Now
Farnell Element14 EUROPE 267 1 Order Now

Distributor reported inventory date: 2020-11-26

Distributor Name

DIGIKEY

Stock

4463

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

3767

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

267

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-26

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel DFN10 3X3 - - CHINA 0.954 / 1k

STEF4SPUR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.954 / 1k

Distributor availability ofSTEF4SPUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4463 1 Order Now
MOUSER WORLDWIDE 3767 1 Order Now
Farnell Element14 EUROPE 267 1 Order Now

Distributor reported inventory date: 2020-11-26

Distributor Name

DIGIKEY

Stock

4463

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

3767

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

267

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-11-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DFN10 3X3

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.954 / 1k

Country of Origin

CHINA

(*) 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