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MF-RX250-AP-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 & Box (TB)
- 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 Bourns MF-RX250-AP-99 is a radial leaded PolySwitch resettable fuse from the MF-R series, designed for overcurrent protection in electronic circuits. It features a hold current of 2.5 A and a trip current of 5.0 A at rated conditions. The device operates with a maximum voltage of 30 V DC and can withstand a maximum fault current of 40 A. Initial resistance is typically 0.025 ohms, while maximum resistance is 0.048 ohms. It functions within an operating temperature range of -40°C to +85°C and utilizes a 5.1 mm lead spacing for PCB mounting.
Feature Summary
- Provides automatic circuit recovery after fault clearance without manual replacement
- Offers dual action protection against overcurrent and excessive heat conditions
- Maintains stable electrical characteristics across wide industrial temperature ranges
Applications
- Consumer electronics power supply input protection
- Portable device battery circuit safeguarding
- Industrial control board overcurrent limiting
Procurement Notes
Verify component authenticity through authorized Bourns distributors or direct manufacturer channels. Confirm RoHS compliance status and specific tape-and-reel versus bulk packaging variants if required for automated assembly processes. Ensure design-in approval prior to procurement as this part may be subject to lifecycle changes.
Selection Notes
Select this component when circuit requirements demand a 2.5 A holding capacity with a 30 V maximum rating. Evaluate thermal derating curves for high ambient environments above 85°C. Compare initial resistance values against voltage drop constraints in low-voltage sensitive applications. Ensure lead spacing matches existing PCB footprint dimensions.
Part Context
This device belongs to the MF-R family of resettable fuses manufactured by Bourns Inc. These components utilize polymer positive temperature coefficient technology to provide reliable circuit protection. The series is widely utilized in various electronic assemblies requiring reusable overcurrent defense mechanisms.
Replacement Considerations
Consult official Bourns substitution guides for verified equivalents. Generic replacements must match hold current, trip current, voltage rating, and physical package dimensions to ensure functional compatibility.
