Polymeric PTC in a 1206 footprint
The Littelfuse 1206L016WR is a surface-mount polymeric PTC resettable fuse from the POLY-FUSE 1206L series, designed for overcurrent protection in compact PCB assemblies. It holds 160 mA continuously at 30 V max and trips at 370 mA, with a maximum interrupt rating of 100 A — enough to clear a hard short on a low-voltage rail without rupturing the package.
Hold current, trip time, and resistance budget
Initial cold resistance is 1.2 Ohms minimum, rising to 4.5 Ohms maximum after a trip event — the post-trip resistance is the figure to budget for voltage drop in the reset state. Typical time to trip at 25 °C is 300 ms at the trip current; a sustained overload above 370 mA will clear within that window, but a fast transient below the trip threshold will not cause a nuisance trip.
Approvals and sourcing posture
The 1206L016WR carries cURus and TUV agency approvals, confirming compliance with North American and European safety standards for polymeric PTC devices.