The FSMD1812 is a circuit protection PTC resettable fuse from RFE/Fuzetec. It is designed for surface mount applications and comes in a tape & reel package. The dimensions of the fuse are 0.179" L x 0.128" W (4.55mm x 3.24mm), with a maximum thickness of 0.035" (0.90mm). The FSMD1812 has a voltage rating of 60V and a maximum current rating of 100 A. It has a hold current of 140 mA and a trip current of 300 mA, with a time to trip of 8 ms. The fuse has a resistance of 1.2 Ohms (initial) and 6.5 Ohms (post-trip). It operates in a temperature range of -40°C to 85°C and is approved by cUL, TUV, and UL. The FSMD1812 is an active product in the circuit protection category.