STEF12EPUR

Current Regulation/Management Overview

The STEF12EPUR is an integrated electronic fuse designed for monitoring output current and input voltage on 12 V DC power lines. It protects downstream circuitry from overcurrent and overvoltage conditions by limiting output current to a safe predefined value during overload events. The device features a controlled turn-on time and delay, ensuring stable startup behavior. It includes thermal protection that signals the fault state via a dedicated pin. Unlike mechanical fuses, it remains functional after protection interventions and resets via supply recycling or the Enable pin. Key electrical parameters include a typical continuous current of 3.6 A, an N-channel on-resistance of 45 mΩ, and an output clamp voltage of 15 V. It operates within a junction temperature range of -40 °C to 125 °C and is available in a DFN10 (3x3 mm) package.

Current Regulation/Management Feature Summary

• Integrated protection against overcurrent and overvoltage with automatic load disconnection during persistent anomalies
• Non-degrading performance after short-circuit or thermal events, allowing reset via supply recycling or Enable pin
• Thermal protection circuit with fault signaling capability through the Fault pin
• Controlled turn-on time and delay for managed power-up sequences

Current Regulation/Management Applications

• Protection of electronic circuitry on 12 V power rails
• Systems requiring reliable eFuse replacement for mechanical fuses
• Applications needing thermal fault indication to board monitoring circuits

Current Regulation/Management Procurement Notes

Verify the specific suffix PUR indicates tape and reel packaging when ordering. Confirm the component matches the STEF12E series specifications, particularly the 3.6 A continuous current and 45 mΩ on-resistance values. Ensure the DFN10 package footprint aligns with the design layout. Check for UL2367 recognition status if regulatory compliance is required for the end application.

Current Regulation/Management Selection Notes

Select this component for 12 V rail protection where non-latching thermal recovery is preferred. Compare with STEF12S if adjustable current limits or hot-swap capabilities are needed instead of fixed protection. Consider the STEF05 companion chip for 5 V rails in dual-voltage systems. Verify that the 45 mΩ on-resistance meets the system's voltage drop requirements.

Current Regulation/Management Part Context

The STEF12EPUR belongs to STMicroelectronics' STEF12 family of electronic fuses. This series provides integrated solutions for monitoring and protecting 12 V DC power lines. The family includes variants like STEF12S and STEF12H60M, offering different current ratings and feature sets such as programmable slew rates or parallel operation capabilities.

Current Regulation/Management Replacement Considerations

STEF12E serves as the base part number. Verify if other suffixes denote identical functionality with different packaging options.