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Product Detailed Parameters
- Description：PTC RESET FUSE 30V 1.85A RADIAL
- Series：Multifuse®, MF-R
- Mfr：Bourns Inc.
- Package：Bulk
- Type：Polymeric
- Voltage - Max：30V
- Current - Hold (Ih) (Max)：1.85 A
- Current - Trip (It)：3.7 A
- Current - Max：40 A
- Time to Trip：8.7 s
- Resistance - Initial (Ri) (Min)：40 mOhms
- Resistance - Post Trip (R1) (Max)：110 mOhms
- Resistance - 25°C (Typ)：-
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.472" Dia x 0.118" T (12.00mm x 3.00mm)
- Height - Seated (Max)：0.724" (18.40mm)
- Thickness (Max)：-
- Lead Spacing：0.201" (5.10mm)
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Overview
The Bourns MF-R185-0-99 is a PTC self-resettable fuse from the Multifuse MF-R series, designed for overcurrent protection in electronic circuits. It features a hold current of 1.85A and a trip current of 3.7A, with a maximum power dissipation of 1W. The device operates within a temperature range of -40°C to +85°C and has a DC rated voltage of 30V. It supports a maximum fault current of 40A and includes an initial resistance minimum of 40mΩ and a post-trip resistance maximum of 110mΩ. The component utilizes a radial through-hole package with a 5.1mm pitch.
Feature Summary
- Provides automatic circuit recovery after overcurrent events without manual replacement
- Offers robust protection against thermal runaway conditions due to positive temperature coefficient characteristics
- Designed for reliable performance in high-temperature environments up to 85°C
Applications
- Overcurrent protection in consumer electronics
- Circuit safeguarding in telecommunications equipment
- Protection in industrial control systems
Procurement Notes
Verify the specific suffix '-0-99' against official Bourns documentation to confirm packaging details or variant specifications. Ensure the selected component matches the required hold and trip currents for the target application. Confirm compliance with RoHS directives and moisture sensitivity level requirements before integration into production designs.
Selection Notes
Select this component when a resettable fuse is required for low-voltage DC circuits operating at 30V or less. Consider the 1.85A hold current and 3.7A trip current thresholds to ensure proper circuit protection without nuisance tripping. Evaluate the through-hole mounting style and physical dimensions to fit the available PCB space and assembly process constraints.
Part Context
The MF-R185-0-99 belongs to Bourns' Multifuse MF-R series of PTC resettable fuses. This series is widely used for protecting sensitive electronic components from overcurrent conditions. The MF-R185 variant specifically addresses applications requiring moderate current protection levels with reliable reset capabilities.
Replacement Considerations
Consult official Bourns substitution guides for compatible alternatives within the MF-R series or other PTC fuse families. Verify that any substitute part meets or exceeds the original electrical ratings and physical footprint requirements.
