Found 4 alternatives for NANOSMD450LR-2 by Littelfuse Inc.. Ptc Resettable Fuses — 1206 (3216 Metric).
PTC RESET FUSE 6V 750MA 1206
PTC RESET FUSE 8V 0.5A 1206
PTC RESET FUSE 24V 300MA 1206
PTC RESET FUSE 6V 5A 1206