Automotive eFuse for 12V and 5V rails
The Texas Instruments TPS25940LQRVCRQ1 is an automotive-grade electronic fuse (eFuse) qualified to AEC-Q100, designed to protect downstream loads from overcurrent, overvoltage, and inrush events on supply rails from 2.7V up to 18V.
What the 5.3A and ±8% accuracy mean for your protection budget
The 5.3A continuous rating sets the maximum steady-state load the eFuse can pass without tripping. For a 12V automotive ECU drawing 4A nominal, this leaves roughly 25% headroom before the limit threshold is reached. The ±8% current-limit accuracy means a programmed 5A limit could trip as low as 4.6A or as high as 5.4A. Design the load budget to stay below the lower bound to avoid nuisance trips at temperature extremes.
For dual-sourcing, evaluate the broader TPS25940 family for variants with similar current and accuracy specs.
Package and footprint — 20-WQFN with exposed pad
Surface-mount assembly only — the WQFN package requires a solder-paste stencil and reflow profile. The exposed pad is electrically connected to the die substrate (typically GND), so the PCB pad should be tied to the ground plane.