STEF05LPUR

Current Regulation/Management Overview

The STEF05LPUR is an integrated electronic fuse designed for 5 V power rails, manufactured by STMicroelectronics. It provides comprehensive protection against overcurrent and overvoltage conditions through a controlled delay and turn-on time mechanism. The device features a typical continuous current of 3.6 A in the DFN package and an N-channel on-resistance of 40 mΩ. It includes an output clamp voltage of 6.1 V and operates within a junction temperature range of -40 °C to +125 °C. The component utilizes a 10-DFN (3x3 mm) surface-mount package.

Current Regulation/Management Feature Summary

• Integrated thermal protection circuit with fault signaling via the Fault pin
• Recoverable operation without degradation after short-circuit or thermal events
• Automatic autoretry function to re-apply power when die temperature returns to safe levels
• Controlled output voltage ramp and undervoltage lockout capabilities

Current Regulation/Management Applications

• Protection of electronic circuitry on 5 V power lines
• Monitoring input voltage and output current in series configurations
• Preventing damage from anomalous overload conditions in portable devices

Current Regulation/Management Procurement Notes

Verify that the specific suffix PUR corresponds to the required packaging format and RoHS compliance status for your manufacturing process. Confirm the part number matches the autoretry variant specifications rather than the latching version. Ensure compatibility with the 10-DFN footprint dimensions during PCB layout finalization.

Current Regulation/Management Selection Notes

Select this component when automatic recovery from thermal faults is required, distinguishing it from the latching STEF05D variant. Consider the 3.6 A continuous current rating and 40 mΩ on-resistance for efficiency requirements. Verify that the 6.1 V output clamp voltage aligns with the downstream load's maximum input tolerance limits.

Current Regulation/Management Part Context

This component belongs to the STEF05 family of electronic fuses optimized for 5 V systems. It serves as a solid-state alternative to mechanical fuses, offering resettable protection. The STEF05L variant specifically introduces autoretry functionality, whereas other family members may offer latching behavior or different package options like Flip Chip.

Current Regulation/Management Replacement Considerations

STEF05D serves as a functional substitute if latching behavior instead of autoretry is acceptable. STEF05SPUR is not a direct replacement due to differing voltage ratings. Verify pinout and thermal characteristics before substituting with non-ST components.