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MF-RX250-2-99
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Product Detailed Parameters
- Description：PTC RESET FUSE 60V 2.5A RADIAL
- Series：Multifuse®, MF-RX
- Mfr：Bourns Inc.
- Package：Tape & Reel (TR)
- Type：Polymeric
- Voltage - Max：60V
- Current - Hold (Ih) (Max)：2.5 A
- Current - Trip (It)：5:00 AM
- Current - Max：40 A
- Time to Trip：15.6 s
- Resistance - Initial (Ri) (Min)：50 mOhms
- Resistance - Post Trip (R1) (Max)：130 mOhms
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.839" L x 0.122" W (21.30mm x 3.10mm)
- Height - Seated (Max)：1.039" (26.40mm)
- Thickness (Max)：-
- Lead Spacing：0.402" (10.20mm)
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Overview
The MF-RX250-2-99 is a polymeric PTC resettable fuse from the Bourns MF-RX series, designed for through-hole radial mounting. It features a maximum voltage rating of 60V and a hold current of 2.5A. The device trips at 5.0A and withstands a maximum rated current of 40A. Its resistance is 48mΩ, with an operating temperature range from -40°C to +85°C. The component utilizes a 5.1mm lead spacing and is supplied in bulk packaging.
Feature Summary
- Provides automatic circuit protection against overcurrent conditions using polymeric positive temperature coefficient technology.
- Offers reliable thermal sensing and rapid response to fault currents without requiring replacement after tripping.
Applications
- Overcurrent protection in consumer electronics circuits
- Protection for portable battery-powered devices
- Circuit safeguarding in industrial control systems
Procurement Notes
Verify component authenticity by cross-referencing the manufacturer part number with official Bourns documentation. Confirm that the specific suffix matches the required electrical characteristics. Ensure compliance with RoHS standards as indicated in the material declaration. Check for obsolescence status prior to procurement planning.
Selection Notes
Select this component based on its 60V maximum voltage and 2.5A hold current requirements. Evaluate the trip current threshold of 5.0A against the circuit's normal operating limits. Consider the radial package and 5.1mm lead spacing for PCB layout compatibility. Assess the thermal performance within the specified -40°C to +85°C operating range.
Part Context
This part belongs to the MF-RX series of resettable fuses, which are widely used for circuit protection. The series offers various current ratings and voltage options to suit different application needs. The MF-RX250-2-99 specifically addresses low-voltage, moderate-current protection scenarios in compact electronic designs.
Replacement Considerations
Publicly confirmed substitute part numbers include MF-RX250-2-AP and MF-RX250-2-72. Verify that any alternative maintains identical electrical parameters and physical dimensions for direct replacement.
