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MF-R250-AP-99
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Product Detailed Parameters
- Description：PTC RESET FUSE 30V 2.5A RADIAL
- Series：Multifuse®, MF-R
- Mfr：Bourns Inc.
- Package：Tape & Box (TB)
- Type：Polymeric
- Voltage - Max：30V
- Current - Hold (Ih) (Max)：2.5 A
- Current - Trip (It)：5:00 AM
- Current - Max：40 A
- Time to Trip：10.3 s
- Resistance - Initial (Ri) (Min)：25 mOhms
- Resistance - Post Trip (R1) (Max)：70 mOhms
- Resistance - 25°C (Typ)：-
- Operating Temperature：-40°C ~ 85°C
- Grade：-
- Qualification：-
- Ratings：-
- Mounting Type：Through Hole
- Package / Case：Radial, Disc
- Size / Dimension：0.472" L x 0.118" W (12.00mm x 3.00mm)
- Height - Seated (Max)：0.720" (18.30mm)
- Thickness (Max)：-
- Lead Spacing：0.201" (5.10mm)
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Overview
The Bourns MF-R250-AP-99 is a radial leaded PPTC resettable fuse from the Multifuse MF-R series. It features a 2.5 A hold current and a 5 A trip current, rated for a maximum voltage of 30 V DC. The device exhibits a typical resistance of 48 mOhms and can withstand a maximum fault current of 40 A. It operates within a temperature range of -40°C to +85°C with a 5.1 mm lead spacing. This specific variant is packaged in an Ammo Pack format.
Feature Summary
- Provides automatic circuit protection by increasing resistance during overcurrent conditions
- Restores conductivity after the fault condition is removed and the device cools down
- Designed for PCB mounting via radial leads
Applications
- Overcurrent protection for portable electronic devices
- Protection for peripheral interfaces such as USB ports
- Battery pack circuit safeguarding
Procurement Notes
Verify the component status carefully before procurement. Official documentation indicates this part number may be classified as Not Recommended for New Designs (NRND). Confirm availability through authorized distributors and ensure the Ammo Pack packaging matches assembly requirements. Cross-reference the exact suffix to confirm the specific reel or tape configuration intended for automated placement.
Selection Notes
Select this component when a low-resistance, high-current resettable fuse is required for 30 V circuits. Ensure the operating environment stays within the specified -40°C to +85°C range. Verify that the 2.5 A hold current aligns with the normal load requirements and that the 5 A trip threshold provides adequate margin against nuisance tripping during startup surges.
Part Context
This component belongs to the Bourns Multifuse MF-R series of PPTC resettable fuses. These devices are widely used in consumer electronics and industrial applications for secondary circuit protection. The MF-R series is characterized by its low profile and ability to handle high fault currents while maintaining a compact footprint suitable for dense PCB layouts.
Replacement Considerations
Consult official Bourns substitution guides for verified alternatives. Generic equivalents may not match the specific trip characteristics or physical dimensions. Verify that any substitute maintains the same voltage rating, hold current, and package style to ensure compatibility with existing board designs.
