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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 is a radial lead PTC resettable fuse from the Multifuse MF-R series, designed for overcurrent protection in low-voltage power supply circuits. It features a 30 VDC maximum voltage rating and a 1.85 A hold current. The device trips at 3.7 A and withstands up to 40 A fault current. Initial resistance ranges from 40 mΩ to 70 mΩ, increasing to a maximum of 110 mΩ after tripping. Operating temperature spans -40°C to +85°C with a 5.1 mm lead spacing.
Feature Summary
- Radial lead construction with cured flame-retardant epoxy polymer insulation
- Meets UL 94V-0 flammability requirements
- RoHS compliant and halogen-free design
Applications
- Computer and peripheral equipment protection
- General electronics circuit safeguarding
- Automotive applications involving low-voltage power supplies
Procurement Notes
Verify component authenticity by checking manufacturer markings against official datasheets. Confirm package dimensions and lead spacing match specifications. Ensure compliance with RoHS and halogen-free requirements if mandated by project standards. Validate electrical parameters such as hold current and trip threshold during incoming inspection.
Selection Notes
Select this component when designing circuits requiring 30 VDC protection with a 1.85 A nominal load. Consider the 40 A maximum fault current capability for surge tolerance. Evaluate thermal management needs within the -40°C to +85°C operating range. Ensure PCB layout accommodates the 5.1 mm radial lead spacing and physical footprint.
Part Context
The MF-R185 belongs to the Bourns Multifuse MF-R series of polymer PTC resettable fuses. This series provides versatile overcurrent protection solutions for various electronic applications. The components utilize a self-regulating heating element that increases resistance significantly upon overheating due to excessive current flow.
Replacement Considerations
Direct substitutes include Eaton PTR030V0185-TR, Littelfuse 30R185UPR, SCHURTER PFRA.185.2, and Littelfuse RUEF185. Verify electrical ratings and physical dimensions before substitution.
