STEF033AJR

Current Regulation/Management Overview

The STEF033AJR is an integrated electronic fuse manufactured by STMicroelectronics, designed for monitoring output current and input voltage on a 3.3 V rail. It protects downstream circuitry from overcurrent and overvoltage conditions. The device features a typical continuous current of 3.6 A and an N-channel on-resistance of 25 mΩ in its Flip Chip package. Operating within an input voltage range of 3.1 V to 8 V, it includes thermal protection with an intervention threshold of 160 °C and an output clamp voltage of 4.5 V. It supports undervoltage lockout and controlled output voltage ramping.

Current Regulation/Management Feature Summary

• Provides active protection against overcurrent, overvoltage, and thermal faults without degrading after intervention.
• Features a controlled delay and turn-on time to manage power-up sequences safely.
• Includes an Enable/Fault pin interface for board-monitoring integration and status signaling.
• Offers reset capability via supply voltage recycling or the Enable pin, eliminating physical replacement needs.

Current Regulation/Management Applications

• Protection of electronic circuitry connected to 3.3 V power rails
• Overcurrent and overvoltage safeguarding in industrial systems
• Thermal fault management in automotive electronics

Current Regulation/Management Procurement Notes

Verify the specific suffix 'JR' corresponds to the required packaging format, typically tape and reel, as indicated by distributor listings. Confirm the component meets RoHS3 compliance requirements for your assembly process. Ensure the 9-FlipChip (1.19x1.19) package dimensions align with your PCB footprint design. Check for any specific moisture sensitivity level handling instructions during storage and reflow soldering.

Current Regulation/Management Selection Notes

Select this component when a non-latching or auto-retry electronic fuse is needed for 3.3 V lines. Consider the 25 mΩ on-resistance for efficiency requirements. Evaluate the need for Fault pin signaling for system diagnostics. Compare against DFN packages if different thermal or spatial constraints exist, noting the 3.6 A rating applies to the DFN variant while the Flip Chip has specific characteristics.

Current Regulation/Management Part Context

The STEF033 belongs to STMicroelectronics' Electronic Fuse family, optimized for protecting sensitive loads. It serves as a modern alternative to mechanical fuses, offering resettable protection. The device integrates short-circuit limiting and overload current limiting functions. It is part of a broader portfolio of PMIC solutions aimed at enhancing system reliability and safety in various electronic applications.

Current Regulation/Management Replacement Considerations

Check for other variants within the STEF033 family, such as those in DFN packages, which may offer different current ratings or thermal performance. Verify if the auto-retry version is required instead of the latching version based on application fault recovery needs. Ensure any substitute maintains the same 9-FlipChip package and electrical specifications.