72R090XU

Ptc Resettable Fuses Overview

The Littelfuse 72R090XU is a radial-leaded PolySwitch resettable PTC fuse designed for overcurrent protection. It features a hold current of 900 mA and a trip current of 1.8 A, with a maximum voltage rating of 72 VDC. The device has a typical resistance of 470 mOhms and a fault current rating of 40 A. Operating within a temperature range of -40°C to +85°C, it offers a power dissipation of 990 mW. Physical dimensions include an 11.2 mm diameter and 3.1 mm length, with a 5.1 mm lead spacing.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection by raising resistance as it heats to limit current flow during fault conditions.
• Offers resettable functionality, allowing the circuit to resume normal operation after the fault condition is removed and the device cools down.
• Designed for PCB mounting with radial leads, facilitating integration into various electronic assemblies.

Ptc Resettable Fuses Applications

• Protection for computer motherboards and peripheral interfaces
• Overcurrent safeguarding in industrial control systems
• Circuit protection for satellite video receivers and modems

Ptc Resettable Fuses Procurement Notes

Verify that the specific part number suffix matches the required packaging format, as variations exist between bulk and tape-and-reel options. Confirm RoHS compliance status through official manufacturer documentation prior to procurement. Ensure the selected variant aligns with the intended thermal management requirements and spatial constraints on the printed circuit board assembly.

Ptc Resettable Fuses Selection Notes

Select this component when a 900 mA hold current and 72 VDC maximum voltage rating are required for radial-leaded applications. Consider the 470 mOhms typical resistance and 40 A fault current capability for circuit design parameters. Evaluate the -40°C to +85°C operating temperature range against environmental conditions to ensure reliable performance throughout the product lifecycle.

Ptc Resettable Fuses Part Context

This device belongs to the 72R series of PolySwitch resettable fuses from Littelfuse. The series provides comprehensive overcurrent protection solutions for automotive, telecom, and general electronics applications. Radial-leaded variants like this model are specifically engineered for through-hole PCB mounting, offering robust protection for wiring harnesses and sensitive components against short circuits and overcurrent events.

Ptc Resettable Fuses Replacement Considerations

The 60R090XU serves as a functional substitute within the same family, sharing identical electrical characteristics such as hold current, trip current, and physical dimensions. The primary distinction lies in the maximum voltage rating, which is reduced to 60 VDC in the replacement part. Verify that the system's operating voltage remains below 60 VDC before implementing this substitution.