Littelfuse 41915000000 Equivalent & Substitute Parts

Part Overview

The Littelfuse 41915000000 is a 5A 125VAC/VDC board mount fuse in 2410 (6125 Metric) surface mount package. 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 -65°C to 125°C with fast blow response characteristics and 50A breaking capacity at rated voltage.

Substiute Parts

41915000000

Littelfuse Inc.In Stock: 92241915000000 Datasheet

Current PartRFQ

0451005.MRL

Littelfuse Inc.In Stock: 1051320451005.MRL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 41915000000 is determined by strict equivalence across the following critical parameters:

• Current Rating: 5 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Fuse Type: Board Mount (Cartridge Style Excluded)
• Mounting Type: Surface Mount
• Response Time: Fast Blow
• Breaking Capacity: 50 A at rated voltage
• Physical Dimensions: 0.240" L x 0.106" W x 0.106" H (6.10mm x 2.69mm x 2.69mm)

The primary substitute identified is the Littelfuse 0451005.MRL, which maintains all critical electrical parameters while offering improved compliance status and active product availability. This part belongs to the NANO²® 451 series and is available in 2-SMD, Square End Block package configuration.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0451005.MRL is the direct functional equivalent for the obsolete 41915000000. Selection of this substitute is supported by:

• Identical electrical ratings (5A, 125VAC/VDC, 50A breaking capacity)
• Matching physical dimensions and surface mount configuration
• Active product status with high inventory availability (105,034 pcs)
• Enhanced regulatory compliance: ROHS3 compliant versus RoHS non-compliant status of the original part
• Expanded approval certifications (CSA, PSE, UL) compared to cULus certification of the original
• Consistent fast blow response characteristic

The 0451005.MRL operates across -55°C to 125°C, which covers the majority of the original part's temperature range with the exception of the lower -65°C limit. Applications requiring operation below -55°C require evaluation of alternative solutions. The melting I²t value of 5.566 for the substitute is lower than the original 6.8, indicating slightly faster thermal response.

Frequently Asked Questions (FAQ)

Q: Can the 0451005.MRL directly replace the 41915000000 in existing designs?

A: The 0451005.MRL maintains all critical electrical parameters (5A, 125VAC/VDC, 50A breaking capacity) and physical dimensions. PCB layout compatibility depends on the specific footprint implementation. The package designation differs (2410 versus 2-SMD, Square End Block), requiring verification of pad configuration and placement against your design files.

Q: What is the significance of the different melting I²t values?

A: The 0451005.MRL has a melting I²t of 5.566 compared to 6.8 for the 41915000000. This indicates the substitute will respond slightly faster to thermal stress. For applications with specific I²t requirements, this difference should be evaluated against circuit protection specifications.

Q: Are there temperature range limitations with the substitute?

A: The 0451005.MRL operates from -55°C to 125°C, compared to -65°C to 125°C for the original part. If your application requires operation below -55°C, the substitute is not suitable without additional thermal management considerations.

Q: What compliance advantages does the 0451005.MRL offer?

A: The substitute is ROHS3 compliant and carries CSA, PSE, and UL certifications, compared to RoHS non-compliant status and cULus certification of the original. This provides improved regulatory alignment for new designs and systems subject to modern compliance requirements.

Q: How do the package differences affect implementation?

A: The original uses 2410 (6125 Metric) package while the substitute uses 2-SMD, Square End Block configuration. Both maintain identical physical dimensions (0.240" L x 0.106" W x 0.106" H), but pad layout and soldering approach may differ. Consult component datasheets for specific footprint requirements.