MF-RX185-AP

Overview

The Bourns MF-RX185-AP is a Polymer Positive Temperature Coefficient (PPTC) resettable fuse from the MF-RX/72 series. It provides overcurrent protection with a hold current of 1.85 A and a trip current of 3.7 A at 25°C. The device is rated for a maximum voltage of 72 VDC and can withstand a maximum fault current of 40 A. Its initial resistance is typically 120 mΩ, with a power dissipation rating of 2.1 W. It operates within a temperature range of -40°C to +85°C and features radial leads with a 5.1 mm spacing.

Feature Summary

• Provides automatic circuit recovery after fault conditions without manual replacement
• Eliminates nuisance tripping caused by ambient temperature variations
• Offers robust protection against short circuits in high-voltage environments

Applications

• Automotive circuitry protection
• Overcurrent surge protection for high-reliability electronic equipment
• Industrial transportation systems
• Communication infrastructure
• Consumer electronic devices

Procurement Notes

Verify that the specific suffix '-AP' corresponds to the Ammo Pack packaging format as indicated by comparable part numbers in the MF-RX/72 series. Confirm RoHS compliance status through official manufacturer documentation or certified datasheets prior to final procurement decisions.

Selection Notes

Select this component when designing circuits requiring 72 VDC protection with a 1.85 A steady-state current. Ensure the PCB layout accommodates the radial lead configuration and 5.1 mm pin spacing. Verify that the expected fault currents do not exceed the 40 A maximum rating to prevent device failure.

Part Context

This part belongs to the Bourns Multifuse MF-RX/72 series of polymer PTC resettable fuses. These components are engineered for applications demanding high reliability and cost-effective overcurrent protection. The series utilizes advanced polymer technology to provide consistent performance across varying thermal conditions.

Replacement Considerations

Direct substitutes include other MF-RX185 variants such as MF-RX185/72-0 or MF-RX185/72-0-14, provided the packaging difference between Ammo Pack and Bulk does not impact assembly processes. Electrical parameters remain identical across these suffixes.