The TPS259251DRCT is a Texas Instruments electronic fuse (eFuse) designed to protect downstream circuitry from overcurrent and overvoltage events on a 5 V nominal supply rail. It integrates a 5 A rated power switch with a built-in BFET driver, so it acts as a resettable circuit breaker rather than a linear regulator. The input voltage range of 4.5 V to 5.5 V covers the full tolerance band of a standard 5 V supply, including the sag and overshoot you see on a lightly loaded backplane. The ±15% accuracy on the current-limit threshold means the trip point can vary by up to 750 mA from the nominal setting—budget that margin when sizing the load. The part is housed in a 10-VSON (3x3 mm) package with an exposed pad for heat sinking, and it operates over the industrial temperature range of -40°C to 85°C, making it suitable for factory automation, telecom line cards, and general-purpose 5 V power distribution in equipment that stays indoors.
Active production – no LTB worry
It is also ROHS3 compliant, which simplifies compliance for EU and similar markets.
Package and handling – 10-VSON with exposed pad
The package is MSL-rated per TI's standard, so check the moisture sensitivity label on the reel before reflow.