MF-RHT500-AP-14

Overview

The Bourns MF-RHT500-AP-14 is a radial leaded PPTC resettable fuse from the Multifuse MF-RHT series, designed for high-temperature circuit protection. It features a hold current of 5.0 A and a trip current of 10 A at maximum operating temperatures. The device supports a maximum voltage of 16 VDC and withstands fault currents up to 100 A. With a low resistance of 37 mOhms, it operates within a temperature range of -40°C to +125°C. The component utilizes a radial package with a 5.1 mm lead spacing, ensuring reliable PCB mounting in demanding thermal environments.

Feature Summary

• Provides overcurrent protection using polymer positive temperature coefficient (PPTC) technology that automatically resets after fault conditions clear.
• Engineered for high-temperature stability, maintaining performance characteristics in environments reaching 125°C without unintended tripping due to ambient heat.
• Offers robust surge and short-circuit tolerance with a high rated maximum current capacity of 100 A for transient event handling.

Applications

• High-temperature automotive electronic circuits requiring reliable overcurrent protection
• Industrial equipment operating in elevated thermal environments
• Consumer electronics subject to strict safety standards and high ambient temperatures

Procurement Notes

Verify the specific suffix AP-14 against the manufacturer's latest datasheet to confirm lead length and packaging configuration. Ensure the procurement source provides valid RoHS compliance documentation. Cross-reference the part number with official Bourns catalogs to distinguish between standard and high-temperature variants, as suffixes often dictate physical dimensions or material specifications critical for board layout compatibility.

Selection Notes

Select this component when circuit protection must function reliably under sustained high ambient temperatures where standard PPTCs might fail. The 5.0 A hold current suits moderate power applications, while the 16 VDC rating limits its use to low-voltage systems. Designers should account for the 37 mOhms resistance for power loss calculations and ensure the 5.1 mm lead spacing fits the target PCB footprint constraints.

Part Context

This part belongs to the Multifuse MF-RHT series, which expands Bourns' portfolio of high-temperature resettable fuses. Unlike standard MF-R devices, the RHT series is optimized for applications exceeding typical 85°C limits. It complements other Bourns protection components by offering a self-resetting alternative to one-time fuses in high-reliability sectors such as automotive and industrial control systems.

Replacement Considerations

Direct substitutes include other MF-RHT series parts with matching electrical ratings, such as the MF-RHT550-2-14 for slightly higher current needs. Verify lead spacing and voltage ratings before substitution. Generic PPTC replacements may lack the specific high-temperature stability required, potentially causing nuisance tripping in hot environments.