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MF-RX185-0-99
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Product Detailed Parameters
- Description：PTC RESET FUSE 60V 1.85A RADIAL
- Series：Multifuse®, MF-RX
- Mfr：Bourns Inc.
- Package：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-RX185-0-99 is a radial leaded PTC resettable fuse from the MF-RX/72 series. It features a hold current of 1.85 A and a trip current of 3.7 A, with a maximum voltage rating of 72 VDC. The device has a maximum resistance of 120 mΩ and a rated interrupting current of 40 A. It operates within a temperature range of -40°C to +85°C and has a lead spacing of 5.1 mm.
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 through-hole PCB mounting
Applications
- Overcurrent protection in consumer electronics circuits
- Circuit safeguarding in office machines and peripherals
- Protection for industrial instrumentation signal lines
Procurement Notes
Verify the specific ordering suffix against the manufacturer's official datasheet to confirm exact electrical tolerances and packaging specifications. Ensure the component meets RoHS compliance requirements for your target market. Cross-reference the lead spacing and body dimensions with your PCB footprint design prior to procurement to guarantee mechanical compatibility.
Selection Notes
Select this component based on the required hold current of 1.85 A and the 72 VDC system voltage. Consider the 120 mΩ maximum resistance for voltage drop calculations. Evaluate the thermal environment to ensure operation remains within the specified -40°C to +85°C range. Confirm that the radial leaded package fits the available board space and assembly process.
Part Context
This part belongs to the Bourns MF-RX/72 series of polymer PTC resettable fuses. These devices are designed for radial through-hole applications, offering a compact solution for circuit protection. The series provides various hold current options to suit different power levels while maintaining a consistent voltage rating and physical form factor for standardized design integration.
Replacement Considerations
Compatible substitutes include other MF-RX series variants with matching 1.85 A hold current and 72 VDC ratings, such as MF-RX185/72-0-14, provided the lead spacing and package dimensions are verified for interchangeability.
