What the 5.5A eFuse buys the rail
The TPS259470ARPWR is an electronic fuse that protects a downstream load from overcurrent and overvoltage on a 2.7V to 23V bus. The 5.5A continuous output rating covers a 3.3V rail at 18W or a 12V rail at 66W before derating — enough for most peripheral, sensor, or sub‑regulator feeds in industrial and telecom gear. The 125°C junction temperature rating lets this eFuse sit next to a hot switching regulator or inside a sealed enclosure without forced air.
Sourcing posture for a BOM line
The pad connects to the GND plane through multiple vias — the thermal resistance to the board depends on the copper area and via count, not the package alone.