Littelfuse 42011000000 Equivalent & Substitute Parts

Part Overview

The Littelfuse 42011000000 is a 1A 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

42011000000

Littelfuse Inc.In Stock: 87442011000000 Datasheet

Current PartRFQ

0452001.MRL

Littelfuse Inc.In Stock: 2212600452001.MRL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0452001.MRL qualifies as a direct substitute based on the following critical parameters:

• Current Rating: Both parts are rated at 1 A
• Voltage Rating - AC: Both parts are rated at 125 V AC
• Response Time: Both parts feature slow blow characteristics
• Mounting Type: Both are surface mount board mount fuses
• Breaking Capacity: Both maintain 50A breaking capacity at rated voltage
• Operating Temperature: Both operate across -55°C to 125°C
• Fuse Type: Both are board mount (cartridge style excluded)

The 0452001.MRL operates at 125 V DC compared to the original part's 80 V DC rating, providing enhanced voltage margin in DC applications. The substitute features improved compliance status (ROHS3 Compliant vs. RoHS non-compliant) and active product status, ensuring long-term availability.

Parameter Comparison

Engineering Selection Recommendations

The 0452001.MRL is the direct equivalent for the obsolete 42011000000. Selection of this substitute is supported by:

• Product Status: The substitute maintains active status, ensuring continued availability and manufacturing support
• Compliance Enhancement: ROHS3 compliance of the substitute exceeds the original part's non-compliant status, meeting modern regulatory requirements
• Certification Scope: The substitute carries expanded approvals (CSA, PSE, UR) compared to the original cURus approval, providing broader market acceptance
• Electrical Equivalence: Matching current rating, AC voltage rating, response time, and breaking capacity ensure functional compatibility in existing circuit designs
• DC Voltage Margin: The increased DC voltage rating (125 V vs. 80 V) provides additional safety margin in DC applications without compromising AC performance

Frequently Asked Questions (FAQ)

Q: Can the 0452001.MRL directly replace the 42011000000 in existing designs?

A: Yes. Both parts share identical current ratings (1 A), AC voltage ratings (125 V), response characteristics (slow blow), and breaking capacity (50A). The substitute's higher DC voltage rating (125 V) is compatible with applications rated at 80 V DC or lower.

Q: What is the primary difference between these two parts?

A: The main differences are package configuration (2410 vs. 2-SMD Square End Block), product status (obsolete vs. active), and compliance certifications. The substitute offers ROHS3 compliance and expanded regulatory approvals.

Q: Are there physical compatibility considerations?

A: Yes. The 42011000000 uses a 2410 (6125 Metric) package, while the 0452001.MRL uses a 2-SMD Square End Block package. Physical dimensions differ slightly (0.240" L x 0.109" W x 0.109" H vs. 0.240" L x 0.106" W x 0.106" H). PCB footprint redesign may be required.

Q: Does the substitute meet the same regulatory standards?

A: The substitute exceeds the original part's certifications. While the original carries cURus approval, the substitute holds CSA, PSE, and UR approvals, providing broader regulatory acceptance.

Q: Is the melting I²t value difference significant?

A: The substitute's melting I²t of 1.98 compared to the original's 1.6 indicates slightly different thermal response characteristics. Both maintain slow blow response classification and are suitable for the same application categories.