MF-RHT550-AP

Overview

The Bourns MF-RHT550-AP is a radial leaded polymeric positive temperature coefficient (PPTC) resettable fuse from the MF-RHT series. It features a hold current of 5.5 A and a trip current of 10 A, designed for high-temperature environments with an operating range of -40°C to +125°C. The device supports a maximum voltage of 16 VDC and has a maximum rated current of 100 A. Its typical resistance is 37 mΩ, with a lead spacing of 5.1 mm.

Feature Summary

• Provides automatic circuit protection through reversible resistance increase upon overcurrent conditions
• Engineered for reliable operation in elevated thermal environments up to 125°C
• Utilizes radial leaded termination for direct printed circuit board mounting

Applications

• High-temperature consumer electronics circuits
• Automotive electronic subsystems requiring thermal resilience
• Industrial instrumentation power input protection
• Telecommunications equipment surge suppression

Procurement Notes

Verify component authenticity by cross-referencing the manufacturer part number with official Bourns documentation. Confirm that the specific suffix matches the required high-temperature rating and voltage specifications. Ensure compliance with RoHS directives as stated in the product datasheet before integration into final assemblies.

Selection Notes

Select this component when applications demand protection against sustained overcurrents in thermally stressed environments. The 5.5 A hold current suits moderate load protection, while the 16 VDC rating limits usage to low-voltage systems. Verify that the 37 mΩ initial resistance aligns with system power loss constraints and that the radial package fits the available PCB footprint.

Part Context

This device belongs to the MF-RHT series, which distinguishes itself from standard PTC fuses by its enhanced thermal stability. The series is engineered to maintain consistent performance characteristics under prolonged exposure to high ambient temperatures, making it suitable for automotive and industrial sectors where standard components may fail prematurely due to heat degradation.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. When replacing this component, ensure the new device matches the 5.5 A hold current, 16 VDC maximum voltage, and radial lead configuration to maintain circuit integrity and thermal performance.