MF-R185-2-17

Overview

The MF-R185-2-17 is a polymeric PTC resettable fuse from the Multifuse® MF-R series by Bourns Inc. It features a 30V DC rated voltage and a 1.85A hold current (Ih). The device trips at 3.7A with a maximum trip time of 8.7 seconds. Initial resistance is typically 40mΩ, rising to a maximum of 110mΩ after tripping. It supports a maximum fault current of 40A and dissipates up to 1W. Operating temperature ranges from -40°C to +85°C. The component uses a radial through-hole package with a 5.1mm lead spacing and measures Φ12.00 x 3.00mm.

Feature Summary

• Provides overcurrent protection via positive temperature coefficient polymer technology
• Automatically resets upon cooling after fault condition removal
• Complies with AEC-Q200 automotive qualification standards

Applications

• Automotive electronic circuit protection
• Consumer electronics power line safeguarding
• Industrial control system overcurrent defense

Procurement Notes

Verify the specific suffix '-2-17' against official Bourns documentation to confirm lead configuration and packaging details. Ensure the application environment remains within the specified -40°C to +85°C operating range. Confirm that the expected hold current does not exceed 1.85A under all thermal conditions. Check for RoHS compliance requirements if applicable to the final assembly. Validate that the 30V DC rating aligns with the circuit's maximum voltage.

Selection Notes

Select this component when a resettable fuse with a 1.85A hold current and 30V DC rating is required. Ensure the circuit's normal operating current stays below 1.85A to prevent nuisance tripping. Verify that the maximum fault current will not exceed the 40A limit. Consider the thermal environment, as ambient temperature affects trip characteristics. Choose this radial package for through-hole mounting applications requiring 5.1mm lead spacing.

Part Context

This part belongs to the Multifuse® MF-R series, designed for general-purpose overcurrent protection. The MF-R series offers various hold currents and voltage ratings. The MF-R185-2-17 specifically targets applications needing moderate current protection with automotive-grade reliability. It serves as a reusable alternative to traditional one-time fuses in circuits where downtime must be minimized.

Replacement Considerations

Direct substitutes include other MF-R series variants with matching electrical parameters. Verify that any replacement maintains the 30V DC rating and 1.85A hold current. Ensure the physical dimensions and lead spacing are compatible with the existing PCB layout. Confirm that the replacement part meets the same AEC-Q200 qualification if used in automotive contexts.