Littelfuse 41912000000 Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 41912000000 is a 2A 125VAC/VDC surface mount board fuse in 2410 (6125 Metric) package format with fast blow response characteristics. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The part operates across a temperature range of -65°C to 125°C and carries cULus approval for safety-critical applications.

Substiute Parts

41912000000

Littelfuse Inc.In Stock: 82241912000000 Datasheet

Current PartRFQ

0451002.MRL

Littelfuse Inc.In Stock: 5464230451002.MRL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 41912000000 is determined by strict equivalence across electrical and mechanical parameters. The primary substitute, Littelfuse 0451002.MRL, maintains functional compatibility through the following criteria:

Electrical Equivalence:

• Identical current rating: 2 A
• Identical AC voltage rating: 125 V
• Identical DC voltage rating: 125 V
• Identical response time classification: Fast Blow
• Identical breaking capacity: 50 A at rated voltage

Mechanical Equivalence:

• Identical mounting type: Surface Mount
• Identical fuse type classification: Board Mount (Cartridge Style Excluded)
• Identical physical dimensions: 0.240" L x 0.106" W x 0.106" H (6.10mm x 2.69mm x 2.69mm)
• Compatible package footprint: 2-SMD, Square End Block format maintains PCB layout compatibility

Environmental Compatibility:

• Operating temperature range: -55°C ~ 125°C (substitute) vs. -65°C ~ 125°C (original) — substitute covers the upper operational envelope with 10°C reduction at lower limit
• Moisture sensitivity level: Both rated MSL 1 (Unlimited)

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0451002.MRL (NANO²® 451 series) is the direct functional equivalent for the obsolete 41912000000. Selection of this substitute is supported by the following engineering factors:

Product Status Justification: The original part is classified as obsolete, while the substitute maintains active production status with 546,400 units in current inventory. This ensures long-term supply chain stability and design continuity.

Compliance Enhancement: The substitute achieves ROHS3 compliance, whereas the original is RoHS non-compliant. For applications subject to environmental regulations, the substitute provides regulatory alignment. The substitute carries expanded approval certifications (CSA, PSE, UL) compared to the original (cULus), broadening its acceptance across international standards frameworks.

Electrical Performance: All critical electrical parameters remain equivalent: 2A current rating, 125VAC/VDC voltage ratings, 50A breaking capacity, and fast blow response. The lower melting I²t value (0.53 vs. 0.9) indicates faster thermal response, which enhances protection characteristics without compromising circuit compatibility.

Thermal Considerations: The substitute operates across -55°C to 125°C, compared to the original -65°C to 125°C. For applications requiring operation below -55°C, the original specification must be retained. For standard industrial and commercial temperature ranges, the substitute is fully compatible.

Packaging and PCB Integration: Both parts maintain identical physical dimensions (6.10mm x 2.69mm x 2.69mm) and surface mount configuration. The substitute's 2-SMD, Square End Block package format is compatible with existing PCB layouts designed for the 2410 (6125 Metric) footprint.

Frequently Asked Questions (FAQ)

Q: Can the 0451002.MRL directly replace the 41912000000 in existing designs?

A: Yes, for applications operating within -55°C to 125°C. The substitute maintains identical electrical ratings (2A, 125VAC/VDC), breaking capacity (50A), response time (fast blow), and physical dimensions. If your application requires operation below -55°C, the original specification must be retained.

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

A: The original 41912000000 has a melting I²t of 0.9, while the substitute 0451002.MRL has 0.53. This lower value indicates faster thermal response and quicker fault protection. Both values are within the fast blow classification and maintain circuit protection equivalence.

Q: Are there packaging differences that affect PCB assembly?

A: Both parts share identical physical dimensions (0.240" L x 0.106" W x 0.106" H). The original uses a 2410 (6125 Metric) package designation, while the substitute uses 2-SMD, Square End Block nomenclature. These represent the same physical footprint and are interchangeable for PCB layout purposes.

Q: Does the substitute meet the same safety certifications?

A: The substitute carries broader certifications (CSA, PSE, UL) compared to the original (cULus). Both certifications cover safety-critical applications. The substitute's expanded certification portfolio provides greater international standards acceptance.

Q: Is the substitute RoHS compliant?

A: Yes. The 0451002.MRL is ROHS3 compliant, whereas the original 41912000000 is RoHS non-compliant. For applications subject to environmental regulations or customer RoHS requirements, the substitute provides regulatory compliance.

Q: What is the availability status of each part?

A: The original 41912000000 is obsolete with 803 units in stock. The substitute 0451002.MRL is active production with 546,400 units in current inventory, ensuring long-term supply chain availability.

Q: Are there any circuit performance differences I should consider?

A: No. Both parts maintain identical electrical specifications for current rating, voltage rating, and breaking capacity. The faster melting I²t of the substitute (0.53 vs. 0.9) enhances protection response without affecting normal circuit operation.