Littelfuse 42013000000 Equivalent & Substitute Parts

Part Overview

The Littelfuse 42013000000 is a 3A 125VAC/80VDC board mount fuse in 2410 (6125 Metric) surface mount package with slow blow response characteristics. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The part operates across a temperature range of -55°C to 125°C and meets cURus approval standards.

Substiute Parts

42013000000

Littelfuse Inc.In Stock: 115142013000000 Datasheet

Current PartRFQ

0452003.MRL

Littelfuse Inc.In Stock: 2267520452003.MRL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0452003.MRL qualifies as a direct substitute based on the following critical parameters:

• Current Rating: Both parts rated at 3 A
• Voltage Rating - AC: Both rated at 125 V AC
• Response Time: Both employ slow blow characteristics
• Mounting Type: Both are surface mount board mount fuses
• Operating Temperature Range: Both operate -55°C to 125°C
• Fuse Type: Both are board mount (cartridge style excluded)

The substitute part features an enhanced DC voltage rating of 125V compared to the original 80V DC specification, providing improved margin in DC applications. The 0452003.MRL utilizes a 2-SMD square end block package versus the original 2410 metric package, requiring PCB layout verification for mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The 0452003.MRL represents the primary equivalent for the obsolete 42013000000 across all critical electrical parameters. The substitute part carries active product status with expanded regulatory approvals (CSA, PSE, UR) compared to the original cURus certification, supporting broader market compliance requirements.

The substitute part achieves ROHS3 compliance, addressing environmental and regulatory requirements not met by the original non-compliant part. The enhanced DC voltage rating of 125V provides additional safety margin in DC circuit applications where the original 80V specification may present limitations.

Physical package transition from 2410 metric to 2-SMD square end block requires PCB footprint redesign. The increased melting I²t value (20.16 versus 11) indicates different thermal response characteristics; circuit protection coordination must be re-evaluated during implementation.

Frequently Asked Questions (FAQ)

Q: Can the 0452003.MRL directly replace the 42013000000 without PCB modification?

A: No. The package transition from 2410 (6125 Metric) to 2-SMD square end block requires PCB footprint redesign. Physical dimensions differ: original measures 0.240" L x 0.109" W x 0.109" H; substitute measures 0.240" L x 0.106" W x 0.106" H. PCB layout verification is mandatory.

Q: What is the significance of the increased DC voltage rating in the substitute part?

A: The 0452003.MRL provides 125V DC rating versus the original 80V DC specification. This represents an enhanced safety margin in DC applications and supports broader circuit design flexibility without compromising protection characteristics.

Q: Are the regulatory certifications equivalent between parts?

A: No. The original part carries cURus approval. The substitute part holds CSA, PSE, and UR certifications. Both certifications are recognized standards; however, specific application requirements may mandate particular agency approvals. Verify compliance requirements for your target market.

Q: How do the melting I²t values affect circuit protection?

A: The substitute part exhibits a melting I²t of 20.16 compared to the original 11. This indicates different thermal response behavior. Circuit protection coordination analysis is required to ensure the substitute part provides equivalent protection in your specific application.

Q: What is the availability status of each part?

A: The original 42013000000 is obsolete with 1134 pieces in stock. The substitute 0452003.MRL is active production with 226,740 pieces available, ensuring long-term supply continuity.