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MF-R300-AP
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Product Detailed Parameters
- Description：PTC RESET FUSE 30V 3A RADIAL
- Series：Multifuse®, MF-R
- Mfr：Bourns Inc.
- Package：Cut Tape (CT),Tape & Box (TB)
- Type：Polymeric
- Voltage - Max：30V
- Current - Hold (Ih) (Max)：3:00 AM
- Current - Trip (It)：6:00 AM
- Current - Max：40 A
- Time to Trip：10.8 s
- Resistance - Initial (Ri) (Min)：20 mOhms
- Resistance - Post Trip (R1) (Max)：80 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-R300-AP is a radial leaded PPTC resettable fuse from the MF-R series, designed for circuit protection. It features a holding current of 3 A and a trip current of 6 A, with a maximum voltage rating of 30 VDC. The device has a maximum resistance of 50 mΩ and can withstand a maximum current of 40 A. It operates within a temperature range of -40°C to +85°C, with a lead spacing of 5.1 mm and a height of 3 mm.
Feature Summary
- Provides automatic circuit recovery after fault conditions clear
- Offers overcurrent protection through positive temperature coefficient polymer technology
- Designed for PCB mounting with radial leads
Applications
- Consumer electronics power supply circuits
- Portable device battery protection
- Industrial control system input/output lines
Procurement Notes
Verify that the suffix AP corresponds to the specific tape-and-reel packaging variant rather than bulk packaging when ordering. Confirm RoHS compliance status directly with the manufacturer or authorized distributor documentation, as environmental declarations may vary by production batch. Ensure the selected component matches the required axial or radial lead configuration for your specific PCB layout constraints.
Selection Notes
Select this component when a 3 A holding current and 30 VDC maximum voltage are required for low-voltage DC circuit protection. Consider the 50 mΩ maximum resistance for minimal voltage drop applications. Evaluate the 40 A maximum current capability against potential fault currents in the target circuit to ensure adequate safety margins during transient events.
Part Context
This part belongs to the Bourns MF-R series of high-density resettable fuses. The series is characterized by compact dimensions and fast response times, suitable for space-constrained designs. The MF-R300-AP specifically denotes the 3 Ampere variant within this family, sharing common thermal and electrical characteristics with other ratings in the same product line.
Replacement Considerations
Cross-reference with other Bourns MF-R series variants such as MF-R300 for bulk packaging if reel format is not critical. Verify equivalent specifications from other manufacturers like Littelfuse or Bel Fuse only if they explicitly match the 3A/30VDC/radial lead parameters without compromising performance.
