AHRF200-2

Ptc Resettable Fuses Overview

The Littelfuse AHRF200-2 is a PolySwitch resettable PTC fuse designed for overcurrent protection in automotive and industrial circuits. It features a radial, disk-style package suitable through-hole mounting with a lead spacing of 5.08 mm. The device maintains a holding current (Ih) of 2 A and trips at 3.8 A within 4.8 seconds. Rated for a maximum voltage of 16 V, it offers an initial resistance of 39 mΩ and a maximum post-trip resistance of 110 mΩ. With a fault current rating of 100 A and an operating temperature range of -40°C to 125°C, it meets AEC-Q200 automotive qualification standards.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection by increasing resistance as the polymer heats during fault conditions
• Automotive-grade construction ensures durability under harsh environmental conditions and vibration
• Radial leaded disk form factor facilitates easy integration into wiring harnesses and PCBs

Ptc Resettable Fuses Applications

• Protection of automotive actuators and small motors
• Overcurrent safeguarding for vehicle display screens
• Circuit protection in commercial vehicle electrical systems

Ptc Resettable Fuses Procurement Notes

Verify that the specific order suffix matches the required packaging format, such as tape-and-reel or cut-strip, as these affect handling procedures. Confirm that the component meets the latest AEC-Q200 qualification requirements for your specific automotive application tier. Ensure compatibility with lead-free reflow soldering processes if surface-mount alternatives are not utilized. Check for any recent product change notices regarding material composition or manufacturing location updates.

Ptc Resettable Fuses Selection Notes

Select this component when a resettable solution is preferred over traditional fuses to reduce maintenance costs in hard-to-access locations. The 2 A holding current and 16 V rating make it suitable for low-voltage automotive subsystems. Consider the 110 mΩ maximum post-trip resistance to ensure it does not cause excessive voltage drop in sensitive signal lines. The wide operating temperature range supports deployment in engine compartments or exterior vehicle modules where thermal extremes are common.

Ptc Resettable Fuses Part Context

This part belongs to the PolySwitch AHRF series, which specializes in radial-leaded resettable fuses for automotive applications. The series provides robust protection for wiring harnesses and PCB components against short circuits and overloads. Unlike one-time fuses, these devices automatically restore function after cooling, enhancing system reliability in passenger and commercial vehicles.

Ptc Resettable Fuses Replacement Considerations

Cross-reference with other AHRF series variants for different current ratings. Verify equivalent parts from other manufacturers only if they match the exact 16 V, 2 A specifications and AEC-Q200 certification. Ensure physical dimensions and lead spacing remain compatible with existing board layouts.