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MF-RX185-2-99
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Product Detailed Parameters
- Description：PTC RESET FUSE 60V 1.85A RADIAL
- Series：Multifuse®, MF-RX
- Mfr：Bourns Inc.
- Package：Tape & Reel (TR),Bulk
- Type：Polymeric
- Voltage - Max：60V
- Current - Hold (Ih) (Max)：1.85 A
- Current - Trip (It)：3.7 A
- Current - Max：40 A
- Time to Trip：12.6 s
- Resistance - Initial (Ri) (Min)：80 mOhms
- Resistance - Post Trip (R1) (Max)：190 mOhms
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.701" L x 0.122" W (17.80mm x 3.10mm)
- Height - Seated (Max)：0.902" (22.90mm)
- Thickness (Max)：-
- Lead Spacing：0.201" (5.10mm)
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Overview
The Bourns MF-RX185-2-99 is a multifuse resettable PTC device from the MF-RX/72 series, designed for through-hole PCB mounting. It features radial leads with a 5.1 mm spacing and a bulk package configuration. The component provides overcurrent protection with a hold current of 1.85 A and a trip current of 3.7 A. It supports a maximum voltage of 72 VDC and has a maximum rated current of 40 A. The device exhibits a resistance of 120 mΩ and operates within a temperature range of -40°C to +85°C.
Feature Summary
- Provides automatic circuit protection by increasing resistance during overcurrent conditions
- Automatically resets to low resistance state after fault clearance and cooling
- Radial leaded construction facilitates standard printed circuit board integration
Applications
- Overcurrent protection in consumer electronic devices
- Circuit safeguarding in industrial control systems
- Protection for telecommunications equipment interfaces
Procurement Notes
Verify the specific suffix '2-99' against the official Bourns datasheet to confirm exact packaging and reel specifications. Ensure the selected variant matches the required hold current and voltage ratings for the target application. Confirm RoHS compliance status and lead-free solderability requirements prior to ordering samples or production quantities.
Selection Notes
Select this component when a 1.85 A hold current and 72 VDC rating are required for radial mounting applications. Compare the 120 mΩ resistance value against system power loss constraints. Evaluate the thermal performance limits relative to the ambient operating environment to ensure reliable tripping behavior under expected load conditions.
Part Context
This part belongs to the Bourns Multifuse MF-RX/72 series of polymer positive temperature coefficient resettable fuses. These devices are engineered for high-reliability overcurrent protection in space-constrained electronics. The series offers various hold currents and voltage ratings to suit diverse circuit protection needs across multiple industries.
Replacement Considerations
Consult the official Bourns replacement guide for verified substitute part numbers. Cross-reference hold current, trip current, and voltage ratings to ensure functional equivalence. Verify package dimensions and lead spacing compatibility before implementing any alternative components.
