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

Part Overview

The Littelfuse 0451008.NR is an 8A 125VAC/125VDC surface mount board mount fuse in the NANO²® 451 series, packaged as 2-SMD with square end block configuration. This part is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active product lines are necessary to maintain design continuity and ensure ongoing component availability for new production and field replacements.

Substiute Parts

0451008.NR

Littelfuse Inc.In Stock: 7540451008.NR Datasheet

Current PartRFQ

0451008.NRL

Littelfuse Inc.In Stock: 10390451008.NRL Datasheet

DirectRFQ

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

0453008.NR

Littelfuse Inc.In Stock: 9440453008.NR Datasheet

Parametric EquivalentRFQ

0476008.MR

Littelfuse Inc.In Stock: 9840476008.MR Datasheet

Parametric EquivalentRFQ

0476008.MRSN

Littelfuse Inc.In Stock: 8860476008.MRSN Datasheet

Parametric EquivalentRFQ

SF-2410FP800T-2

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

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0451008.NR is determined by strict equivalence across the following critical 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)
• Physical Dimensions: 0.240" L x 0.106" W x 0.106" H (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Littelfuse NANO²® 451 Series): Parts 0451008.NRL, 0451008.MRSN, and 0451008.MRL maintain identical electrical and mechanical specifications with active product status and enhanced RoHS3 compliance.

Parametric Equivalents (Alternative Series): Parts 0448008.MR, 0453008.MR, 0453008.NR, 0476008.MR, and 0476008.MRSN meet all critical electrical and mechanical parameters but originate from different NANO²® series (448, 453, 476). The Bourns SF-2410FP800T-2 from the SinglFuse™ SF-2410FP-T series also meets all critical parameters with minor dimensional tolerance variations within acceptable limits.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

The Littelfuse 0451008.NRL, 0451008.MRSN, and 0451008.MRL are the preferred substitutes. These parts maintain identical electrical characteristics and mechanical dimensions to the obsolete 0451008.NR while offering active product status and ROHS3 compliance. Selection among these three should be based on packaging requirements: 0451008.NRL for standard Tape & Reel, 0451008.MRSN for alternative Tape & Reel configuration, and 0451008.MRL for Cut Tape & Digi-Reel® applications.

Secondary Substitutes (Parametric Equivalents):

The Littelfuse 0448008.MR, 0453008.MR, 0453008.NR, 0476008.MR, and 0476008.MRSN meet all critical electrical and mechanical parameters. These parts are suitable for applications where component interchangeability is required. The 0476008 series offers enhanced breaking capacity (100A AC, 300A DC) compared to the 50A rating of the original part, providing additional margin in high-fault-current environments.

Cross-Manufacturer Substitute:

The Bourns SF-2410FP800T-2 provides parametric equivalence with active product status and ROHS3 compliance. This part is suitable for applications requiring multi-source qualification or where Bourns components are preferred within the supply chain.

All recommended substitutes carry appropriate regulatory certifications (CSA, UL, PSE, cURus, or equivalent) and operate within the -55°C to 125°C temperature range specified for the original part.

Frequently Asked Questions (FAQ)

Q: Can I use 0451008.NRL as a direct replacement for 0451008.NR?

A: Yes. The 0451008.NRL is electrically and mechanically identical to the 0451008.NR. The primary difference is product status (active vs. obsolete) and packaging format (Tape & Reel vs. bulk). Both parts maintain 8A current rating, 125V AC/DC voltage rating, 50A breaking capacity, and identical physical dimensions.

Q: What is the difference between the NANO²® 451, 448, and 453 series?

A: All three series meet the critical electrical and mechanical parameters for this 8A 125V application. The primary differences are melting I²t values and DC cold resistance. The 0448008.MR has a lower melting I²t (18.33 vs. 20.23), while the 0453008 series maintains identical I²t to the original part. These variations do not affect functional compatibility in standard applications.

Q: Why does the 0476008 series have higher breaking capacity?

A: The 0476008 series (100A AC, 300A DC breaking capacity) is designed for applications with higher fault current levels. While it meets all critical electrical and mechanical parameters for this 8A application, the enhanced breaking capacity provides additional safety margin in systems with elevated short-circuit current ratings.

Q: Is the Bourns SF-2410FP800T-2 fully compatible?

A: The SF-2410FP800T-2 meets all critical electrical and mechanical parameters: 8A current rating, 125V AC/DC voltage rating, Fast Blow response, 2-SMD package, and equivalent physical dimensions. Minor dimensional tolerance variations (0.102" vs. 0.106" width and height) fall within acceptable PCB footprint tolerances. This part is suitable for applications requiring cross-manufacturer qualification.

Q: What packaging options are available?

A: The 0451008.NRL is supplied in standard Tape & Reel (TR) format. The 0451008.MRL offers Cut Tape (CT) & Digi-Reel® packaging for alternative handling requirements. The 0451008.MRSN provides an alternative Tape & Reel configuration. All other substitutes are supplied in Tape & Reel format. Packaging selection should align with assembly equipment and inventory management requirements.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All active substitute parts listed carry ROHS3 compliance certification. The original 0451008.NR is RoHS non-compliant due to its obsolete status. Migration to any of the recommended substitutes ensures compliance with current environmental regulations.

Q: Which substitute has the best inventory availability?

A: The 0451008.MRL offers the highest inventory level (60,400 pcs) among all substitutes. The 0453008.MR provides 10,985 pcs, and the 0451008.NRL provides 1,004 pcs. Inventory levels should be verified with your component supplier for current availability.