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Product Detailed Parameters
- Description：PTC RESET FUSE 30V 1.85A RADIAL
- Series：Multifuse®, MF-R
- Mfr：Bourns Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- 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-R185-2-99 is a PTC self-resettable fuse from the Multifuse MF-R series, designed for overcurrent protection. It features a hold current of 1.85A and a trip current of 3.7A at ambient temperature. Rated for 30V DC with a maximum surge current of 40A, it operates within a temperature range of -40°C to +85°C. The component has a maximum power dissipation of 1W and an initial resistance minimum of 40mΩ. Post-trip resistance is capped at 110mΩ. It utilizes a radial leaded package measuring Φ12.00 x 3.00mm with a height of 18.40mm and a 5.1mm pin pitch.
Feature Summary
- Provides automatic circuit recovery after fault clearance without manual replacement
- Offers dual-mode protection against overcurrent and excessive temperature conditions
- Ensures stable electrical performance across wide industrial operating temperatures
Applications
- Overcurrent protection in consumer electronic devices
- Circuit safeguarding in telecommunications equipment
- Protection for battery management systems
- Surge protection in industrial control circuits
Procurement Notes
Verify the specific suffix '-2-99' against official Bourns documentation to confirm exact packaging or tape-and-reel specifications. Ensure the selected variant matches the required axial/radial lead configuration and voltage rating for the target application. Cross-reference datasheet parameters for hold and trip currents to validate compatibility with system design limits before procurement.
Selection Notes
Select this component based on the 1.85A hold current requirement and 30V DC rating. Consider the 40A maximum surge current capability for handling transient loads. Evaluate the thermal environment to ensure operation remains within the -40°C to +85°C range. Verify that the physical dimensions fit the available PCB space and that the lead spacing aligns with the board layout requirements.
Part Context
This part belongs to the Bourns Multifuse MF-R series, which provides reliable resettable protection for various electronic applications. The series is known for its robust construction and consistent performance in safeguarding circuits from damage due to overcurrent events. It serves as a critical safety component in modern electronics where maintenance-free operation is essential.
Replacement Considerations
Consult official Bourns substitution guides for direct equivalents. Verify that any alternative maintains identical hold current, trip current, and voltage ratings. Ensure physical package compatibility and thermal characteristics match the original design requirements to prevent circuit failure.
