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Product Detailed Parameters
- Description：PTC RESET FUSE 30V 1.85A RADIAL
- Series：Multifuse®, MF-R
- Mfr：Bourns Inc.
- Package：Tape & Box (TB)
- 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-AP-99 is a resettable PTC 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. Key electrical parameters include an initial resistance minimum of 40mΩ and a post-trip resistance maximum of 110mΩ. It supports a maximum fault current of 40A and trips in 8.7 seconds at the trip current. The component is lead-free, has MSL level 1 status, and utilizes a radial through-hole package with a 5.1mm pitch.
Feature Summary
- Provides automatic circuit recovery after fault conditions without manual replacement
- Offers reliable overcurrent protection with defined thermal response characteristics
- Constructed with lead-free materials compliant with environmental standards
Applications
- Overcurrent protection in consumer electronics
- Circuit safeguarding in industrial instrumentation
- Protection for telecommunications equipment ports
Procurement Notes
Verify the specific suffix AP-99 against official Bourns documentation to confirm tape-and-reel packaging specifications and quantity per reel. Ensure the selected variant matches the required axial or radial lead configuration for the target PCB layout. Cross-reference the datasheet for any updates on RoHS compliance status or material declarations prior to final procurement approval.
Selection Notes
Select this component based on the 1.85A hold current requirement and 30V DC rating. Consider the 110mΩ maximum post-trip resistance impact on circuit operation during latched states. Evaluate the 8.7-second trip time against the protected load's surge tolerance. Confirm that the operating temperature range of -40°C to +85°C aligns with the environmental conditions of the end application.
Part Context
This part belongs to the Bourns Multifuse MF-R series of self-resetting polymeric positive temperature coefficient devices. These components are engineered to replace traditional fuses in applications requiring repeated overcurrent events. The MF-R series provides a compact solution for protecting sensitive downstream components from damage due to short circuits or excessive current draw.
Replacement Considerations
Direct substitutes must match the 1.85A hold current, 30V rating, and similar physical dimensions. Verify that alternative PTC devices offer comparable trip times and residual resistance levels to ensure circuit performance parity.
