Littelfuse 0476002.MRSN Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0476002.MRSN is a 2 A, 250 V AC / 125 V DC surface mount board fuse in the NANO²®476 series. This fast-blow fuse is designed for circuit protection in surface mount applications with a 2-SMD, square end block package. The part is currently active in production with full inventory availability. Alternative equivalent parts may be required due to supply chain considerations, packaging preferences, or specific procurement requirements while maintaining identical electrical and mechanical performance.

Substiute Parts

0476002.MRSN

LittelfuseIn Stock: 21100476002.MRSN Datasheet

Current PartRFQ

0476002.MR

Littelfuse Inc.In Stock: 23470476002.MR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the Littelfuse 0476002.MRSN is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part 0476002.MR qualifies as a direct equivalent based on the following criteria:

• Identical current rating of 2 A
• Identical AC voltage rating of 250 V and DC voltage rating of 125 V
• Identical response time classification (Fast Blow)
• Identical package type (2-SMD, Square End Block) and physical dimensions
• Identical breaking capacity (100 A AC, 300 A DC)
• Identical melting I²t value of 0.53
• Identical operating temperature range (-55°C to 125°C)
• Identical DC cold resistance of 0.0448 Ohms
• Identical series designation (NANO²®476)
• Identical compliance certifications (cURus, ROHS3, REACH Unaffected)

The only distinction between the main part and substitute is the packaging format designation (MRSN vs. MR), both supplied as Tape & Reel (TR).

Parameter Comparison

Engineering Selection Recommendations

Both the 0476002.MRSN and 0476002.MR are active production parts from Littelfuse with full regulatory compliance. Selection between these equivalent parts should be based on inventory availability and procurement lead times. The 0476002.MR currently maintains higher stock levels (2300 pcs vs. 2050 pcs), which may provide supply chain advantages. Both parts carry identical cURus approval and ROHS3 compliance certifications, ensuring regulatory equivalence for all applications. The REACH Unaffected status applies to both parts, confirming compliance with chemical substance restrictions.

Frequently Asked Questions (FAQ)

Q: Can the 0476002.MR be used as a direct replacement for the 0476002.MRSN in production?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including current rating, voltage ratings, response time, package dimensions, and thermal characteristics. The difference in part number suffix (MRSN vs. MR) reflects packaging designation only, not functional differences.

Q: Are there any differences in the 2-SMD, square end block package between these parts?

A: No. Both parts share identical physical dimensions of 0.240" L x 0.106" W x 0.106" H (6.10 mm x 2.69 mm x 2.69 mm) and the same package configuration. PCB footprints and assembly processes are interchangeable.

Q: Do both parts meet the same regulatory certifications?

A: Yes. Both the 0476002.MRSN and 0476002.MR carry cURus approval, ROHS3 compliance, and REACH Unaffected status. They are equivalent for all regulatory and compliance requirements.

Q: What is the significance of the melting I²t value of 0.53?

A: The melting I²t value defines the thermal energy required to melt the fuse element. An identical value of 0.53 across both parts ensures identical trip characteristics and protection performance in circuit applications.

Q: Are there any temperature or environmental limitations that differ between these parts?

A: No. Both parts operate across the identical temperature range of -55°C to 125°C and share the same Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating no moisture-related handling restrictions.

Q: What is the breaking capacity, and is it the same for both parts?

A: The breaking capacity is 100 A AC and 300 A DC for both parts. This specification defines the maximum fault current the fuse can safely interrupt without damage or hazard.