750 mA hold, 1.5 A trip — the PTC that clears fast
The Littelfuse 1206L075SLYR is a polymeric PTC resettable fuse from the POLY-FUSE® LoRho series, rated to hold 750 mA continuously at 6V max. When a fault pushes current past 1.5 A (the trip current), the polymer heats and switches to a high-resistance state, limiting the fault to 50 A max. The trip happens in 300 ms typical — fast enough to protect a USB port or battery line from a dead short without letting the trace fuse.
Low-resistance LoRho — less voltage drop in the power path
Initial resistance (Ri) is 17 mOhms minimum; post-trip resistance (R1) climbs to 180 mOhms max. The LoRho formulation keeps the series drop under 13 mV at 750 mA — a meaningful margin when the downstream rail is 3.3V or 1.8V and every millivolt counts. Surface-mount assembly with tape-and-reel or cut-tape options. Design the trip threshold with the derating curve in mind.
Active production, cURus and TUV approved
The part carries cURus and TUV approvals, covering North American and European equipment safety requirements for a resettable overcurrent protector.