750 mA hold, 1.5 A trip — the PTC resettable fuse for 13.2 V rails
The Littelfuse 1206L075/13.2WR is a polymeric PTC resettable fuse from the POLY-FUSE® 1206L series, designed to protect low-voltage DC power rails up to 13.2 V. With a hold current of 750 mA, it carries normal load current without tripping; when the fault current exceeds the 1.5 A trip threshold, the PTC element heats up and its resistance jumps from a 90 mOhm minimum to a 350 mOhm maximum post-trip state, limiting the current. The device resets automatically once power is removed and the polymer cools — no fuse replacement needed. Rated for a maximum fault current of 100 A, this PTC can handle short-circuit events on the 13.2 V rail without failing open or catching fire — the internal resistance rise limits the let-through energy. The 200 ms typical trip time at fault current means the protection engages fast enough to keep downstream silicon within its SOA for most overcurrent events.
Surface-mount 1206 footprint for automated assembly
The concave termination style helps with solder fillet inspection — the metallization wraps up the side of the ceramic body, giving a visible meniscus on the side of the part after reflow. Surface-mount mounting means the part sits flat on the PCB pad, with no through-hole leads to route. The 90 mOhms initial resistance adds minimal voltage drop at 750 mA — about 68 mV — so the load sees nearly the full rail voltage during normal operation.
Active production with cURus and TUV safety marks
The device carries cURus and TUV approval, meaning it has passed the UL 1434 and IEC 60738-1 standards for polymeric PTC thermistors. These marks are accepted in North American and European equipment certification — the fuse is a recognized component under UL and TUV, so the end-product safety agency review will accept it without additional testing. The hold current derates with temperature; at 85°C ambient the 750 mA hold current drops to roughly 60% of the 25°C rating, so the actual load current at high temperature must be lower than the rated hold to avoid nuisance tripping.