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MF-R300-0-99
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Product Detailed Parameters
- Description：PTC RESET FUSE 30V 3A RADIAL
- Series：Multifuse®, MF-R
- Mfr：Bourns Inc.
- Package：Bulk
- 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-R300-0-99 is a radial leaded Polymeric Positive Temperature Coefficient (PPTC) resettable fuse from the Multifuse MF-R series. It features a hold current of 3 A and a trip current of 6 A, with a maximum voltage rating of 30 VDC. The device has a maximum rated current of 40 A and an initial resistance of 50 mΩ. It operates within a temperature range of -40°C to +85°C and utilizes a 5.1 mm lead spacing for PCB mounting.
Feature Summary
- Provides automatic circuit protection by increasing resistance in response to overcurrent or overheating conditions.
- Offers resettable functionality, allowing the component to return to low-resistance state after fault clearance.
- Designed for through-hole PCB mounting with radial leads for secure mechanical attachment.
Applications
- Overcurrent protection for portable electronic devices
- Protection circuits in automotive electronics
- Industrial control system power lines
Procurement Notes
Verify the specific ordering suffix against the official Bourns datasheet to ensure correct packaging and tolerance specifications. Confirm that the MF-R series designation aligns with the required thermal and electrical characteristics for the target application environment before finalizing procurement orders.
Selection Notes
Select this component based on the 3 A hold current and 30 VDC rating requirements. Ensure the application's operating temperature remains within the specified -40°C to +85°C range. Verify that the 50 mΩ initial resistance meets the circuit's voltage drop constraints and that the radial package fits the available PCB footprint.
Part Context
This part belongs to the Bourns Multifuse MF-R series of high-density PPTC resettable fuses. The series is designed for compact circuit protection applications where space is limited. The MF-R variant specifically offers robust performance in consumer and industrial electronics, providing reliable overcurrent protection without requiring manual replacement after tripping events.
Replacement Considerations
Consult the official Bourns replacement guide for direct substitutes. Ensure any alternative maintains identical hold current, voltage rating, and package dimensions to preserve circuit integrity and board compatibility.
