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  • The STEF033 is an integrated electronic fuse optimized for monitoring output current and the input voltage. Connected in series to the 3.3 V rail, it is able to protect the electronic circuitry on its output from overcurrent and overvoltage. The STEF033 has controlled delay and turn-on time. 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, when the power is re-applied the E-fuse initially limits the output current to a safe value and then goes again into the open state. The voltage clamping circuit prevents the output voltage from exceeding a fixed value, if the input voltage goes beyond this threshold. The device is equipped with a thermal protection circuit. Intervention of thermal protection is signaled to the board-monitoring circuits through an appropriate signal on the Fault pin. Unlike mechanical fuses, which must be physically replaced after a single event, the E-fuse does not degrade in its performances following short-circuit/thermal protection intervention and is reset either by re-cycling the supply voltage or using the appropriate Enable pin. The STEF033 is also available in an auto-retry version; in case of thermal fault it automatically attempts to re-apply power to the load when the die temperature returns to a safe value.

    Key Features

    • Continuous current typ.: 3.6 A (DFN), 2.5 A (Flip Chip)
    • N-channel on resistance (typ): 40 mΩ (DFN), 25 mΩ (Flip Chip)
    • Enable/Fault functions
    • Output clamp voltage (typ): 4.5 V
    • Undervoltage lockout
    • Short-circuit limit
    • Overload current limit
    • Controlled output voltage ramp
    • Thermal latch (typ): 160 °C
    • Uses tiny capacitors
    • Latching and auto-retry versions
    • Operative junction temp. - 40 °C to 125 °C
    • Available in DFN10 3x3 and Flip Chip 9 bumps

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CAD/EDA Symbols, Footprints and Models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STEF033AJR
Active
Flip-Chip 9 Industrial Ecopack2
STEF033APUR
Active
DFN10 3X3 Industrial Ecopack2
STEF033JR
Active
Flip-Chip 9 Industrial Ecopack2
STEF033PUR
Active
DFN10 3X3 Industrial Ecopack2

STEF033AJR

Package:

Flip-Chip 9

Material Declaration**:

Marketing Status

Active

Package

Flip-Chip 9

Grade

Industrial

RoHS Compliance Grade

Ecopack2

STEF033APUR

Package:

DFN10 3X3

Material Declaration**:

Marketing Status

Active

Package

DFN10 3X3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

STEF033JR

Package:

Flip-Chip 9

Material Declaration**:

Marketing Status

Active

Package

Flip-Chip 9

Grade

Industrial

RoHS Compliance Grade

Ecopack2

STEF033PUR

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
STEF033AJR Available at 2 distributors

Distributor availability ofSTEF033AJR

Distributor Name
Region Stock Min. Order Third party link
ARROW EUROPE 5000 0 Order Now
MOUSER WORLDWIDE 4950 1 Order Now

Distributor reported inventory date: 2020-10-26

Distributor Name

ARROW

Stock

5000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

4950

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-26

Buy Direct
Active
EAR99 NEC Tape And Reel Flip-Chip 9 - - CHINA 0.5 / 1k
STEF033PUR Available at 2 distributors

Distributor availability ofSTEF033PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 586 1 Order Now
Farnell Element14 EUROPE 249 1 Order Now

Distributor reported inventory date: 2020-10-26

Distributor Name

DIGIKEY

Stock

586

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

249

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-26

Buy Direct
Active
EAR99 NEC Tape And Reel DFN10 3X3 - - CHINA 0.596 / 1k
STEF033JR No availability of distributors reported, please contact our sales office Buy Direct
Active
EAR99 NEC Tape And Reel Flip-Chip 9 - - CHINA 0.5 / 1k
STEF033APUR No availability of distributors reported, please contact our sales office Buy Direct
Active
EAR99 NEC Tape And Reel DFN10 3X3 - - CHINA 0.596 / 1k

STEF033AJR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.5 / 1k

Distributor availability ofSTEF033AJR

Distributor Name
Region Stock Min. Order Third party link
ARROW EUROPE 5000 0 Order Now
MOUSER WORLDWIDE 4950 1 Order Now

Distributor reported inventory date: 2020-10-26

Distributor Name

ARROW

Stock

5000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

4950

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

Flip-Chip 9

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.5 / 1k

Country of Origin

CHINA

STEF033PUR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.596 / 1k

Distributor availability ofSTEF033PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 586 1 Order Now
Farnell Element14 EUROPE 249 1 Order Now

Distributor reported inventory date: 2020-10-26

Distributor Name

DIGIKEY

Stock

586

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

249

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DFN10 3X3

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.596 / 1k

Country of Origin

CHINA

STEF033JR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.5 / 1k

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

Flip-Chip 9

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.5 / 1k

Country of Origin

CHINA

STEF033APUR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.596 / 1k

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

DFN10 3X3

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.596 / 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