2.5 A fast-blow in a 0603 footprint
The Littelfuse 046702.5NR is a 2.5 A fast-blow fuse in the 467 series, housed in a standard 0603 (1608 metric) surface-mount package. The fast-blow response clears overcurrents quickly, making it a typical choice for protecting sensitive downstream ICs and power rails where a slow-blow would let through too much energy before opening. Rated for 32 VAC and 32 VDC, it handles low-voltage rail protection common in telecom, industrial control, and portable equipment. The 35 A breaking capacity at rated voltage means it can safely interrupt a fault current up to that level without rupturing — important for coordinating with the upstream supply impedance.
Melting I²t and DC resistance
The melting I²t of 0.2066 is the energy let-through spec that matters when sizing the fuse to protect a trace or a semiconductor junction — a downstream component with a lower I²t withstand rating will fail before the fuse opens if the numbers don't stack. The 0.021 Ohm DC cold resistance translates to a 52.5 mV voltage drop at rated current, negligible in a 5 V rail but worth a check in a 1.2 V core supply where every millivolt of headroom counts.
Active lifecycle and compliance
Approvals from CSA and UL are on file, confirming the fuse meets North American safety standards for overcurrent protection. The 0603 package is supplied on tape and reel (or cut tape) for automated pick-and-place assembly.