Littelfuse 0476007.MRSN Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0476007.MRSN is a 7 A, 125 V AC/DC surface mount board mount fuse in the NANO²®476 series. This fast-blow fuse is designed for circuit protection in applications requiring 2-SMD, square end block packaging. The part is currently active and widely available in inventory (751 pcs). Alternative part numbers within the NANO²® fuse family provide equivalent electrical performance with variations in breaking capacity, melting I²t characteristics, and packaging formats. Identifying suitable substitutes ensures design flexibility and supply chain continuity.

Substiute Parts

0476007.MRSN

Littelfuse Inc.In Stock: 8100476007.MRSN Datasheet

Current PartRFQ

0448007.MR

Littelfuse Inc.In Stock: 171340448007.MR Datasheet

Parametric EquivalentRFQ

0451007.MRL

Littelfuse Inc.In Stock: 402850451007.MRL Datasheet

Parametric EquivalentRFQ

0451007.NRL

Littelfuse Inc.In Stock: 50200451007.NRL Datasheet

Parametric EquivalentRFQ

0453007.MR

Littelfuse Inc.In Stock: 158120453007.MR Datasheet

Parametric EquivalentRFQ

0476007.MR

Littelfuse Inc.In Stock: 25460476007.MR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0476007.MRSN is determined by the following core parameters:

• Current Rating: 7 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)

All substitute parts listed below meet these core electrical and mechanical parameters. Variations exist in breaking capacity, melting I²t, approval agencies, and packaging format (Tape & Reel vs. Cut Tape & Digi-Reel®), which do not affect functional interchangeability in applications where the core parameters are the design requirement.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are active products from Littelfuse Inc. and maintain identical core electrical and mechanical specifications required for functional interchangeability. Selection among these alternatives should be based on:

Packaging Format Compatibility: The 0476007.MRSN is supplied in Tape & Reel (TR) format. Parts 0451007.MRL and 0453007.MR are supplied in Cut Tape (CT) & Digi-Reel® format and require compatible handling and placement equipment.

Inventory Availability: Part 0451007.MRL offers the highest inventory level (40,200 pcs), followed by 0448007.MR (17,043 pcs) and 0453007.MR (15,723 pcs). The primary part 0476007.MRSN has 751 pcs available.

Regulatory Compliance: All parts are ROHS3 compliant and REACH unaffected. The 0476007.MRSN and 0476007.MR carry cURus approval. Parts 0448007.MR, 0451007.NRL, 0451007.MRL, and 0453007.MR carry CSA, UL, and PSE approvals. Verify approval agency requirements for your specific application.

Breaking Capacity Variation: The 0476007.MRSN and 0476007.MR provide 100A AC and 300A DC breaking capacity. Alternative series (0448007.MR, 0451007.NRL, 0451007.MRL, 0453007.MR) provide 50A breaking capacity. This difference does not affect substitution eligibility but should be evaluated against circuit protection requirements.

Frequently Asked Questions (FAQ)

Q: Can 0448007.MR be used as a direct replacement for 0476007.MRSN?

A: Yes. Both parts share identical current rating (7 A), voltage ratings (125 V AC/DC), response time (Fast Blow), mounting type (Surface Mount), package type (2-SMD, Square End Block), physical dimensions (6.10mm x 2.69mm x 2.69mm), and operating temperature range (-55°C ~ 125°C). The breaking capacity differs (50A vs. 100A AC/300A DC), but this does not prevent functional substitution in applications where the core electrical parameters are met.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging?

A: Tape & Reel (TR) packaging supplies components on a continuous reel suitable for automated pick-and-place equipment. Cut Tape (CT) & Digi-Reel® packaging provides components in cut tape format with optional reel configuration. Equipment compatibility and handling procedures differ between formats. Verify your assembly process supports the selected packaging format.

Q: Are all substitute parts RoHS compliant?

A: Yes. All parts listed are ROHS3 compliant and suitable for applications requiring RoHS compliance.

Q: Does the melting I²t value affect substitution eligibility?

A: Melting I²t is a thermal characteristic that influences fuse response behavior but does not determine substitution eligibility when all core electrical and mechanical parameters match. The 0476007.MRSN has a melting I²t of 7.8, while alternatives range from 10.32 to 13.92. Application-specific thermal requirements should be evaluated independently.

Q: Which substitute part has the best inventory availability?

A: Part 0451007.MRL offers the highest inventory level at 40,200 pcs in Cut Tape (CT) & Digi-Reel® format. If Tape & Reel (TR) format is required, 0448007.MR provides 17,043 pcs.

Q: Can I substitute based on approval agency differences?

A: All parts are active products with valid regulatory approvals. The 0476007.MRSN carries cURus approval, while alternatives carry CSA, UL, and PSE approvals. Verify that the approval agencies on the substitute part meet your application's regulatory requirements before selection.