2.5 A fast-blow SMD fuse — Littelfuse NANO² 451 series
The Littelfuse 045102.5NR is a 2.5 A fast-blow surface-mount fuse from the NANO²® 451 series, rated for 125 V AC and 125 V DC with a breaking capacity of 50 A at rated voltage. The fast-blow response time means it opens quickly on overcurrents, protecting sensitive downstream components in board-level power paths.
Package and board-fit
Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm, this fuse is designed for surface-mount assembly on standard PCB pads. The tape and reel packaging (TR) supports automated pick-and-place for volume production.
Electrical characteristics and approvals
With a DC cold resistance of 0.0286 Ohms and a melting I²t of 1.029, this fuse offers predictable inrush withstand — useful for sizing protection in capacitive or inductive load circuits. Approved by CSA, PSE, and UL, the 045102.5NR carries the regulatory acceptance needed for equipment sold into North American and Japanese markets.