MF-R050 PTC Resettable Fuse: Reliable Overcurrent Protection for Electronics | Bourns Inc.
MF-R050 PTC Resettable Fuse: Ultimate Circuit Protection for Reliable Electronics
In today s fast-paced electronics industry, safeguarding circuits from overcurrent conditions is critical to ensure longevity and performance. The MF-R050 PTC resettable fuse from Bourns Inc., a global leader in electronic components, provides robust, reusable protection against overcurrent events. This comprehensive guide explores the MF-R050 s advanced features, technical specifications, and applications, making it the go-to choice for engineers and designers.
What is the MF-R050 PTC Resettable Fuse?
The MF-R050 is a polymeric positive temperature coefficient (PTC) resettable fuse designed to protect circuits from excessive current. Unlike traditional fuses that blow and require replacement, the MF-R050 automatically resets once the fault is cleared, reducing downtime and maintenance costs. Its active product status ensures availability for both prototyping and mass production.
Detailed Technical Specifications
1. Voltage and Current Ratings
- Maximum Voltage (Vmax): 60V DC
- Maximum Current (Imax): 40A (fault condition)
- Hold Current (Ih): 500mA (operates normally below this threshold)
- Trip Current (It): 1A (trips within 4 seconds)
2. Resistance Properties
- Initial Resistance (Ri): 410 m (minimizes power loss during normal operation)
- Post-Trip Resistance (R1): 1.17 (effectively isolates the circuit during faults)
3. Temperature and Environmental Resilience
- Operating Temperature Range: -40 C to +85 C (suitable for harsh environments)
- Compliance: RoHS compliant, lead-free construction
4. Mechanical and Mounting Details
- Mounting Type: Through-hole (for secure PCB attachment)
- Package: Radial disc (compact design saves board space)
- Dimensions: 7.90mm (dia.) x 3.10mm (thickness)
- Lead Spacing: 5.10mm (standard compatibility)
Why Choose the MF-R050? Key Benefits
1. Self-Resetting Capability
The MF-R050 eliminates the need for manual replacement after a fault, reducing maintenance efforts and costs. It automatically resets when the overcurrent condition is resolved, ensuring uninterrupted operation.
2. Fast-Acting Protection
With a trip time of just 4 seconds at 1A, the MF-R050 responds swiftly to overcurrent events, preventing damage to sensitive components like microcontrollers, sensors, and power supplies.
3. Wide Application Range
Ideal for use in:
- Consumer Electronics: USB hubs, gaming consoles, smart home devices
- Automotive Systems: Infotainment, lighting controls, battery management
- Industrial Equipment: Motor drives, PLCs, power distribution units
- Telecommunications: Routers, base stations, network switches
4. Cost and Space Efficiency
The compact radial design and reusability make the MF-R050 a cost-effective alternative to one-time fuses, optimizing both budget and PCB real estate.
Comparison with Traditional Fuses
| Feature | MF-R050 PTC Fuse | Traditional Fuse |
|---|---|---|
| Reset Mechanism | Automatic (self-resetting) | Manual replacement required |
| Response Time | 4 seconds at 1A | Varies (often slower) |
| Lifespan | Long-term reusable | Single-use |
| Cost Over Time | Lower (no replacements) | Higher (frequent replacements) |
Frequently Asked Questions (FAQ)
Q1: Can the MF-R050 be used in high-voltage applications?
A: Yes, its 60V rating makes it suitable for low-to-medium voltage circuits, including automotive and industrial systems.
Q2: How does the PTC effect work?
A: The fuse s polymer material heats up under overcurrent, increasing resistance dramatically to limit current flow. It cools and resets when normal conditions return.
Q3: Is the MF-R050 suitable for surface-mount designs?
A: No, this model is through-hole only. Bourns offers SMD alternatives like the MF-SM series for surface-mount applications.
Where to Buy and How to Implement
The MF-R050 is available through authorized distributors like Digi-Key, Mouser, and RS Components. For seamless integration:
- Place the fuse in series with the load.
- Ensure the operating current remains below 500mA to avoid nuisance tripping.
- Refer to Bourns application notes for layout best practices.
Final Thoughts
The MF-R050 from Bourns Inc. is a superior choice for engineers seeking reliable, reusable overcurrent protection. Its blend of fast response, durability, and cost efficiency makes it indispensable for modern electronics. Search "MF-R050" on Google to explore datasheets, pricing, and technical support equip your designs with trusted circuit protection today!