Littelfuse 41911000000 Equivalent & Substitute Parts

Part Overview

The Littelfuse 41911000000 is a 1 A, 125 V AC/DC board mount surface mount fuse with fast blow response time, housed in a 2410 (6125 Metric) package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The part operates across a temperature range of -65°C to 125°C and carries cULus approval. Due to its obsolete status, equivalent alternatives must maintain electrical and mechanical compatibility while offering active product availability.

Substiute Parts

41911000000

Littelfuse Inc.In Stock: 87741911000000 Datasheet

Current PartRFQ

0451001.MRL

Littelfuse Inc.In Stock: 1802730451001.MRL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 41911000000 is based on strict electrical and mechanical parameter alignment:

Electrical Compatibility Criteria:

• Current Rating: 1 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity: 50 A @ rated voltage (exact match required)

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount (exact match required)
• Fuse Type: Board Mount (Cartridge Style Excluded) (exact match required)
• Physical Dimensions: 0.240" L x 0.106" W x 0.106" H (exact match required)

Regulatory & Environmental Criteria:

• Approval Agencies: UL, CSA, or equivalent recognized standards
• Operating Temperature: Must support -55°C minimum to 125°C maximum
• RoHS Compliance: Preferred for new designs
• Moisture Sensitivity Level: 1 (Unlimited)

The substitute part 0451001.MRL meets all electrical and mechanical requirements while offering active product status and enhanced regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0451001.MRL is the direct substitute for the obsolete 41911000000. Selection is based on the following engineering factors:

Product Availability: The 41911000000 is obsolete with limited inventory (867 pcs). The 0451001.MRL is active with substantial inventory (180,200 pcs), ensuring long-term procurement continuity.

Electrical Equivalence: All critical electrical parameters are identical: 1 A current rating, 125 V AC/DC voltage rating, fast blow response, and 50 A breaking capacity. The melting I²t values (0.42 vs. 0.459) are within acceptable tolerance for this fuse category.

Regulatory Compliance: The substitute carries expanded certifications (CSA, PSE, UL) compared to the original cULus approval. The 0451001.MRL achieves ROHS3 compliance, meeting modern environmental standards, whereas the original is RoHS non-compliant.

Mechanical Compatibility: Physical dimensions are identical (0.240" L x 0.106" W x 0.106" H), and both employ surface mount technology with the same board mount fuse type. Package designation differs (2410 vs. 2-SMD, Square End Block) but maintains mechanical and electrical interchangeability.

Temperature Performance: The substitute operates from -55°C to 125°C, which covers the upper temperature range of the original (-65°C to 125°C). For applications requiring -65°C operation, thermal performance must be evaluated against specific circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the 0451001.MRL be used as a direct replacement for the 41911000000 in existing designs?

A: Yes. Both parts share identical electrical ratings (1 A, 125 V AC/DC, fast blow), breaking capacity (50 A), and physical dimensions (0.240" L x 0.106" W x 0.106" H). Surface mount footprints are compatible. No circuit redesign is required.

Q: What is the difference between the 2410 package and the 2-SMD, Square End Block package?

A: Both designations describe the same physical form factor and footprint for this fuse category. The 2410 (6125 Metric) and 2-SMD, Square End Block are equivalent mechanical packages with identical dimensions and mounting compatibility.

Q: Does the operating temperature difference (-65°C vs. -55°C minimum) affect substitution?

A: The substitute operates from -55°C minimum, compared to the original's -65°C minimum. For applications operating above -55°C, there is no functional impact. Applications requiring -65°C operation must evaluate whether the -55°C minimum of the substitute meets circuit performance requirements.

Q: Is the 0451001.MRL RoHS compliant?

A: Yes. The 0451001.MRL is ROHS3 compliant, whereas the original 41911000000 is RoHS non-compliant. This makes the substitute suitable for designs requiring environmental compliance.

Q: What certifications does the substitute carry?

A: The 0451001.MRL carries CSA, PSE, and UL approvals, providing broader regulatory recognition than the original cULus approval.

Q: Are there inventory considerations for this substitution?

A: The original 41911000000 has 867 pcs in stock (obsolete status). The substitute 0451001.MRL has 180,200 pcs available (active product), ensuring reliable long-term procurement.