MF-MSMF260-2 PTC Resettable Fuse: Advanced Circuit Protection Solution

The MF-MSMF260-2 from Bourns Inc. represents the cutting edge in polymeric positive temperature coefficient (PTC) resettable fuse technology. This surface-mount device provides exceptional overcurrent protection for modern electronic circuits, combining rapid response times with the convenience of automatic reset functionality. Engineered to meet rigorous automotive standards, this fuse is revolutionizing circuit protection across multiple industries.

Comprehensive Technical Specifications

Electrical Performance Characteristics

The MF-MSMF260-2 delivers precise current regulation with:

• Voltage Rating: 6V DC maximum working voltage
• Hold Current (Ih): 2.6A (maximum at 23 C)
• Trip Current (It): 5.2A (minimum at 23 C)
• Time-to-Trip: 5 seconds at 200% of rated current
• Maximum Interrupt Current: 100A

These specifications make it particularly suitable for protecting sensitive low-voltage circuits in automotive electronics, USB power delivery systems, and battery management applications.

Advanced Resistance Properties

The fuse's innovative polymeric composition provides:

• Initial Resistance (Ri): 15m maximum (ensuring minimal voltage drop)
• Post-Trip Resistance (R1): 80m maximum (effective current limitation)
• Low Power Dissipation: Typically <0.1W during normal operation

Environmental Durability

Designed for reliability in harsh conditions:

• Temperature Range: -40 C to +85 C operational
• Certifications: AEC-Q200 qualified for automotive applications
• Moisture Resistance: Meets J-STD-020 moisture sensitivity level 1
• Mechanical Stability: Robust construction withstands vibration and shock

Package Dimensions and Mounting

The MF-MSMF260-2 features a compact surface-mount design:

• Package Type: 1812 (4532 metric) concave
• Dimensions: 4.55mm 3.24mm 0.85mm (L W H)
• Termination: Matte tin-plated contacts for excellent solderability
• PCB Footprint: Compatible with standard SMT assembly processes

Industry-Leading Applications

The MF-MSMF260-2 excels in numerous critical applications:

Automotive Electronics

• ECU power supply protection
• Infotainment system safeguards
• LED lighting circuit protection
• Advanced driver assistance systems (ADAS)

Consumer Electronics

• USB port overcurrent protection
• Lithium-ion battery pack safety
• Smart home device power management
• Wearable electronics circuit protection

Industrial Applications

• PLC I/O module protection
• Sensor network safeguards
• Power supply unit current limiting
• Motor control circuit protection

Competitive Advantages

The MF-MSMF260-2 outperforms conventional fuses with:

Automatic Reset Functionality

Unlike traditional fuses that require replacement after tripping, this PTC device automatically resets when:

• The fault condition is removed
• Power is cycled
• The device cools sufficiently

Precision Protection

The sharp trip characteristic ensures:

• Fast response to overcurrent events
• Predictable trip thresholds
• Minimal nuisance tripping

Space-Efficient Design

The compact 1812 package enables:

• High-density PCB layouts
• Integration in space-constrained devices
• Simplified inventory management

Technical Comparison Guide

When evaluating circuit protection options, consider these key differentiators:

Feature	MF-MSMF260-2	Traditional Fuse	Bimetal Breaker
Reset Method	Automatic	Replace	Manual/Auto
Response Time	Fast (ms)	Fast (ms)	Slow (s)
Voltage Drop	Low	Very Low	Medium
Lifetime	1000+ trips	Single use	100-1000 cycles
Cost Efficiency	High	Low	Medium

Implementation Guidelines

PCB Layout Recommendations

• Maintain minimum 0.5mm clearance from other components
• Ensure adequate thermal relief in copper pours
• Position away from heat-sensitive components

Reliability Considerations

• Derate current capacity at elevated temperatures
• Account for I R heating in high-current applications
• Monitor for environmental contaminants

Purchasing Information

The MF-MSMF260-2 is available through authorized Bourns distributors worldwide. Typical packaging options include:

• 7-inch tape and reel (3000 pieces)
• 13-inch tape and reel (4000 pieces)
• Sample packs (25 pieces)

For volume pricing and technical support, contact Bourns' global network of application engineers who can assist with:

• Custom configuration options
• Application-specific design guidance
• Reliability testing data
• Alternative part recommendations

Why Designers Choose the MF-MSMF260-2

This PTC resettable fuse delivers unmatched value through:

1. Proven Reliability: Millions of units deployed in field applications
2. Cost Reduction: Eliminates replacement costs and downtime
3. Design Flexibility: Compatible with automated assembly processes
4. Safety Compliance: Meets international safety standards
5. Technical Support: Backed by Bourns' engineering expertise

For your next design requiring robust overcurrent protection, specify the MF-MSMF260-2 PTC resettable fuse - the intelligent choice for reliable circuit protection.