Littelfuse 0451008.NRL Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0451008.NRL is an 8 A, 125 V AC/DC surface mount board mount fuse in the NANO²® 451 series. This fast-blow fuse is designed for circuit protection in applications requiring 2-SMD, square end block packaging. The part is active and widely available with 1004 pieces in stock. Alternative part numbers are necessary when specific packaging formats (Cut Tape vs. Tape & Reel), regional certifications, or inventory constraints require substitution while maintaining identical electrical and mechanical performance.

Substiute Parts

0451008.NRL

Littelfuse Inc.In Stock: 10390451008.NRL Datasheet

Current PartRFQ

0448008.MR

Littelfuse Inc.In Stock: 22820448008.MR Datasheet

Parametric EquivalentRFQ

0451008.MRL

Littelfuse Inc.In Stock: 604240451008.MRL Datasheet

Parametric EquivalentRFQ

0451008.MRSN

Littelfuse Inc.In Stock: 19450451008.MRSN Datasheet

Parametric EquivalentRFQ

0453008.MR

Littelfuse Inc.In Stock: 110780453008.MR Datasheet

Parametric EquivalentRFQ

SF-2410FP800T-2

Bourns Inc.In Stock: 2748SF-2410FP800T-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

• Current Rating: 8 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 2-SMD, Square End Block (exact match required)
• Breaking Capacity @ Rated Voltage: 50 A (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Physical Dimensions: 0.240" L x 0.106" W x 0.106" H (exact match required for Littelfuse parts; Bourns part has minor width/height variance of 0.004")

Littelfuse parametric equivalents (0448008.MR, 0451008.MRL, 0451008.MRSN, 0453008.MR) differ only in series designation, packaging format (Tape & Reel vs. Cut Tape), and regional certifications. The Bourns SF-2410FP800T-2 is a direct manufacturer alternative with identical electrical specifications and minor dimensional tolerance differences within acceptable mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain active product status and meet the core electrical and mechanical requirements for direct substitution in 8 A, 125 V AC/DC surface mount fuse applications.

Littelfuse parametric equivalents (0448008.MR, 0451008.MRL, 0451008.MRSN, 0453008.MR) are certified by CSA, PSE, and UL with identical dimensional specifications. Selection among these parts is determined by packaging format availability: 0451008.MRL offers the highest inventory (60400 pieces) in Cut Tape and Digi-Reel® format, while 0451008.NRL, 0451008.MRSN, 0453008.MR, and 0448008.MR are available in Tape & Reel format. The 0451008.MRSN variant includes METI and UR certifications for specific regional requirements.

The Bourns SF-2410FP800T-2 is a direct cross-reference from an alternative manufacturer with cUL and UL certifications. Physical dimensions show minor tolerance differences (width and height 0.004" smaller), which remain within acceptable mechanical compatibility for standard PCB footprints. DC cold resistance is 0.0085 Ohms compared to 0.0077 Ohms for Littelfuse parts, and melting I²t is 16.758 compared to 20.23 for the primary part. These variations fall within normal manufacturing tolerances for equivalent fuse performance.

Frequently Asked Questions (FAQ)

Q: Can 0451008.MRL be used as a direct replacement for 0451008.NRL?

A: Yes. Both parts are from the NANO²® 451 series with identical electrical specifications (8 A, 125 V AC/DC, fast-blow response), mechanical dimensions, and certifications. The difference is packaging format: 0451008.NRL is Tape & Reel, while 0451008.MRL is Cut Tape and Digi-Reel®. Selection depends on assembly equipment compatibility and inventory availability.

Q: What is the difference between the Littelfuse 0448008.MR and 0451008.NRL?

A: Both parts are electrically and mechanically equivalent with 8 A, 125 V AC/DC ratings and identical physical dimensions. The 0448008.MR belongs to the NANO²® 448 series while 0451008.NRL is NANO²® 451. The melting I²t differs slightly (18.33 vs. 20.23), and DC cold resistance is marginally higher (0.0078 vs. 0.0077 Ohms). These variations are within normal manufacturing tolerances and do not affect functional equivalence.

Q: Is the Bourns SF-2410FP800T-2 compatible with the same PCB footprint as the Littelfuse 0451008.NRL?

A: The Bourns part has minor dimensional differences: width and height are 0.004" smaller (2.59mm vs. 2.69mm) while length remains 0.240" (6.10mm). These tolerance differences are within acceptable mechanical compatibility for standard 2-SMD, square end block footprints. Verify footprint specifications with your PCB design documentation.

Q: What certifications apply to each substitute part?

A: 0451008.NRL, 0451008.MRL, 0453008.MR, and 0448008.MR carry CSA, PSE, and UL certifications. The 0451008.MRSN variant includes CSA, METI, and UR certifications for specific regional markets. The Bourns SF-2410FP800T-2 carries cUL and UL certifications. Select based on your application's regional compliance requirements.

Q: Why does the 0451008.MRSN have different certifications?

A: The 0451008.MRSN includes METI (Ministry of Economy, Trade and Industry) and UR (Underwriters' Laboratories of Japan) certifications in addition to CSA, addressing specific regulatory requirements in Japanese and certain Asian markets. Electrical and mechanical specifications remain identical to other NANO²® 451 variants.

Q: Can I substitute the Bourns SF-2410FP800T-2 for the Littelfuse 0451008.NRL in all applications?

A: The Bourns part meets all core electrical requirements (8 A, 125 V AC/DC, fast-blow, 50 A breaking capacity) and operates across the same temperature range. However, verify that your application accepts the slightly lower melting I²t (16.758 vs. 20.23) and higher DC cold resistance (0.0085 vs. 0.0077 Ohms). Confirm PCB footprint compatibility due to minor dimensional differences.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel packaging is continuous reel format suitable for high-speed automated assembly equipment. Cut Tape is pre-cut segments on carrier tape, typically used for lower-volume production or manual assembly. Digi-Reel® is Littelfuse's proprietary format combining benefits of both. Selection depends on your assembly process and equipment specifications.