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MF-RX375-2-99
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Product Detailed Parameters
- Description：PTC RESET FUSE 60V 3.75A RADIAL
- Series：Multifuse®, MF-RX
- Mfr：Bourns Inc.
- Package：Tape & Reel (TR)
- Type：Polymeric
- Voltage - Max：60V
- Current - Hold (Ih) (Max)：3.75 A
- Current - Trip (It)：7.5 A
- Current - Max：40 A
- Time to Trip：24 s
- Resistance - Initial (Ri) (Min)：30 mOhms
- Resistance - Post Trip (R1) (Max)：80 mOhms
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：1.118" L x 0.122" W (28.40mm x 3.10mm)
- Height - Seated (Max)：1.319" (33.50mm)
- Thickness (Max)：-
- Lead Spacing：0.402" (10.20mm)
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Overview
The MF-RX375-2-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc. It features a radial through-hole package with a disc form factor. The device is rated for a maximum working voltage of 60V and a hold current of 3.75A. Key electrical specifications include a trip current of 7.5A, a maximum fault current rating of 40A, and a power dissipation capacity of 3.2W. The component has a typical trip time of 24 seconds and an initial resistance of 0.03 Ohms. Physical dimensions are approximately 28.4mm in diameter and 3.1mm in height, with a lead spacing of 10.20mm.
Feature Summary
- Provides automatic overcurrent protection through positive temperature coefficient polymer technology
- Offers resettable functionality to restore circuit continuity after fault conditions clear
- Designed for radial through-hole mounting with standardized lead spacing
Applications
- Overcurrent protection in consumer electronics circuits
- Protection for portable battery-powered devices
- Surge and overload safeguarding in industrial control systems
Procurement Notes
Verify the specific suffix -99 indicates tape and reel packaging configuration when sourcing. Confirm that the 60V rating aligns with the target circuit's maximum operating voltage. Ensure the 3.75A hold current meets the application's continuous load requirements without nuisance tripping. Cross-reference the 40A maximum fault current capability against potential short-circuit scenarios to ensure adequate safety margins.
Selection Notes
Select this component when a resettable solution is preferred over traditional fuses to reduce maintenance. The 60V rating suits low-voltage DC applications. The 3.75A hold current defines the continuous operational limit. Consider the 24-second trip time for applications requiring delayed response to transient surges. The radial package facilitates easy integration into standard PCB layouts requiring through-hole assembly.
Part Context
This part belongs to the MF-RX series of polymeric PTC resettable fuses from Bourns Inc. The series is designed for compact power protection in various electronic devices. The MF-RX line offers a range of hold currents and voltage ratings to suit different circuit protection needs. This specific model provides a balance of moderate current handling and resettable convenience.
Replacement Considerations
Direct substitutes may include other MF-RX series variants with matching 60V and 3.75A ratings. Verify that any replacement maintains the same radial package dimensions and lead spacing. Ensure the alternative component meets the same 40A maximum fault current requirement. Check for equivalent trip time characteristics to maintain circuit protection timing.
