Littelfuse 42015000000 Equivalent & Substitute Parts

Part Overview

The Littelfuse 42015000000 is a 5A 125VAC/80VDC board mount fuse in 2410 (6125 Metric) surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of -55°C to 125°C with slow blow response characteristics and is approved by cURus standards.

Substiute Parts

42015000000

Littelfuse Inc.In Stock: 102442015000000 Datasheet

Current PartRFQ

0452005.MRL

Littelfuse Inc.In Stock: 3480900452005.MRL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0452005.MRL qualifies as a direct substitute based on the following critical parameters:

• Current Rating: Both parts rated at 5 A
• Voltage Rating - AC: Both rated at 125 V
• Response Time: Both classified as Slow Blow
• Mounting Type: Both surface mount configurations
• Fuse Type: Both board mount (cartridge style excluded)
• Operating Temperature Range: Identical -55°C to 125°C
• Approval Standards: Both meet required electrical safety certifications

The 0452005.MRL operates at 125V DC compared to the original part's 80V DC rating, providing enhanced voltage capability. The package format differs (2-SMD, Square End Block versus 2410 Metric), requiring PCB layout verification during implementation.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0452005.MRL is the qualified substitute for the obsolete 42015000000. Selection is based on:

• Electrical equivalence across all critical parameters (current, AC voltage, response time)
• Enhanced DC voltage rating (125V versus 80V) provides margin for existing 80V DC applications
• Active product status ensures long-term availability and supply chain continuity
• ROHS3 compliance meets current environmental and regulatory requirements
• Identical operating temperature range maintains thermal performance specifications
• Breaking capacity specifications meet or exceed original part requirements

PCB layout modification is required due to package format change from 2410 (6125 Metric) to 2-SMD, Square End Block. Footprint verification and land pattern adjustment are necessary before production implementation.

Frequently Asked Questions (FAQ)

Q: Can the 0452005.MRL directly replace the 42015000000 without PCB modification?

A: No. While electrically equivalent, the package formats differ (2410 Metric versus 2-SMD, Square End Block). PCB footprint and land pattern redesign is required.

Q: Is the higher DC voltage rating (125V versus 80V) on the substitute part acceptable?

A: Yes. The substitute's 125V DC rating exceeds the original 80V DC requirement, providing additional voltage margin. This is acceptable for all applications rated at 80V DC or lower.

Q: What certifications does the substitute part carry?

A: The 0452005.MRL holds CSA, PSE, and UR approvals, compared to the original part's cURus certification. Both meet required electrical safety standards for board mount fuse applications.

Q: Why is the original part obsolete?

A: The 42015000000 is classified as obsolete by Littelfuse. The 0452005.MRL from the NANO²® 452 series represents the current generation replacement with improved specifications and environmental compliance.

Q: Are there inventory considerations between these parts?

A: The original part has limited inventory (1000 Pcs). The substitute 0452005.MRL has significantly higher availability (348006 Pcs) in Cut Tape and Digi-Reel® packaging, supporting production scalability.

Q: What is the melting I²t difference between these parts?

A: The original part specifies 50 melting I²t, while the substitute specifies 53.72. This minor difference maintains equivalent thermal response characteristics for slow blow fuse operation.