About this part

0451001.MR – 1A Fast-Acting SMT Fuse – Littelfuse NANO²® 451 Series

Secure your electronics with the Littelfuse 0451001.MR surface-mount fuse, engineered for reliable overcurrent protection in compact designs. This fast-blow fuse delivers precision circuit safeguarding with UL/CSA/PSE certifications. PCX provides immediate stock of this obsolete-series component for urgent projects, backed by rapid shipping and technical support.

Key Features

• Current Rating: 1A
• Voltage Rating: 125V AC/DC
• Response Time: Fast Blow
• Breaking Capacity: 50A @ Rated Voltage
• DC Cold Resistance: 0.153 Ohms
• Operating Temperature: -55°C to 125°C
• Certifications: UL, CSA, PSE

Technical Specifications

Housed in a space-saving 6.1mm x 2.69mm 2-SMD package, this cartridge-style fuse features a low melting I²t of 0.459 for rapid fault interruption. Ideal for high-density PCBs, its square-end block construction ensures stable mounting. Surface-mount design simplifies automated assembly while maintaining robust 125V AC/DC protection across industrial temperature ranges.

Typical Applications

• Consumer electronics power supplies
• Telecommunications equipment
• Industrial control systems
• USB power delivery circuits
• IoT and portable device protection

About Littelfuse

Littelfuse is a global leader in circuit protection technologies, renowned for innovative solutions that enhance electronic safety and reliability. With nearly a century of expertise, the company sets industry standards for fuses, surge protection, and power control devices across automotive, industrial, and consumer markets.

Their NANO²® series exemplifies cutting-edge miniaturization without compromising performance. Littelfuse components undergo rigorous validation to meet international safety certifications, ensuring consistent protection in critical applications worldwide.

About Surface-Mount Fuses

SMT fuses are essential safeguards that prevent catastrophic damage from overcurrent events in modern electronics. By interrupting excessive current flow within milliseconds, they protect sensitive components like ICs, power regulators, and connectors from thermal damage or fire hazards.

These compact devices enable automated PCB assembly while providing reliable protection in space-constrained designs. Selecting the appropriate current rating, response speed, and breaking capacity ensures optimal system safety and minimizes downtime in applications ranging from medical devices to renewable energy systems.

Packaging

Available in Tape & Reel (TR) packaging for streamlined pick-and-place assembly.

Frequently Asked Questions

Q: Is this fuse suitable for automotive applications?
A: While rated for industrial temperatures (-55°C to 125°C), verify specific automotive standards compliance with our technical team.

Q: Can I use this for 5V USB circuits?
A: Yes, its 125V DC rating exceeds USB requirements. Ensure the 1A rating matches your circuit’s max current.

Q: What replaces this obsolete part?
A: Contact PCX for recommended alternatives. We maintain stock of legacy components like the 0451001.MR.

Q: How does fast-blow differ from slow-blow?
A: Fast-blown fuses react quicker to overcurrent (ideal for sensitive ICs), while slow-blow tolerate brief surges.

Q: What’s the significance of 0.153Ω cold resistance?
A: Lower resistance minimizes voltage drop and power loss during normal operation.

Q: Are datasheets available?
A: Yes, access the Littelfuse datasheet via PCXCo.com.

Disclaimer: Product images are representational. Refer to datasheets for exact specifications.

Order today for fast delivery!

Leverage PCX’s reliable inventory of certified Littelfuse components. Contact our support team for volume pricing and technical assistance.