STEF033JR

Current Regulation/Management Overview

The STEF033JR is an integrated electronic fuse designed for monitoring output current and input voltage on a 3.3 V rail. It protects downstream circuitry from overcurrent and overvoltage conditions with controlled delay and turn-on times. The device features a typical continuous current of 2.5 A in its Flip Chip package, with a typical N-channel on-resistance of 25 mΩ. It includes an output clamp voltage of 4.5 V and operates within a junction temperature range of -40 °C to 125 °C.

Current Regulation/Management Feature Summary

• Provides integrated protection against overcurrent, overvoltage, and thermal faults without degrading performance after intervention.
• Features a thermal protection circuit that signals board-monitoring systems via the Fault pin upon intervention.
• Supports reset functionality through supply voltage recycling or the Enable pin, eliminating the need for physical replacement.

Current Regulation/Management Applications

• Protection of electronic circuitry connected in series to 3.3 V power rails
• Overcurrent and overvoltage safeguarding in general-purpose AC switching applications
• Thermal fault management in high-temperature environments

Current Regulation/Management Procurement Notes

Verify the specific suffix (e.g., AJR) required for your design, as package variations exist. Confirm RoHS compliance status and moisture sensitivity level before integration. Ensure the selected variant matches the required current rating and thermal characteristics for the target application environment.

Current Regulation/Management Selection Notes

Select this component when a compact, resettable solution is needed for 3.3 V line protection. Consider the Flip Chip package for space-constrained designs requiring low on-resistance. Evaluate the auto-retry versus latching versions based on system recovery requirements following a fault event.

Current Regulation/Management Part Context

This part belongs to STMicroelectronics' electronic fuse family, optimized for protecting sensitive electronics. It serves as a modern alternative to mechanical fuses, offering superior reliability and diagnostic capabilities through integrated fault signaling and automatic reset mechanisms.

Current Regulation/Management Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing PCB footprints and control logic if considering alternatives.