Found 7 alternatives for TSM600-400F-2 by Littelfuse Inc.. Ptc Resettable Fuses — 4-SMD.
PTC RESET FUSE 250V 250MA 4SMD
PTC RESET FUSE 60V 130MA 4SMD
PTC RESET FUSE 60V 130MA 4SMD
PTC RESET FUSE 240V 140MA 4SMD
THERMISTOR PTC 35 OHM 15% 4SMD
PTC RESET FUSE 250V 250MA 4SMD
THERMISTOR PTC 35 OHM 15% 4SMD