Littelfuse 044802.5MR Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 044802.5MR is a 2.5 A, 125 V AC/DC surface mount board mount fuse in the NANO²® 448 series. This fast-blow fuse is designed for circuit protection in applications requiring compact SMD packaging with a 2-SMD square end block configuration. The part is active in production with full regulatory approvals (CSA, UL, PSE) and ROHS3 compliance.

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory availability, supply chain considerations, or series-specific performance characteristics while maintaining identical electrical and mechanical specifications.

Substiute Parts

044802.5MR

Littelfuse Inc.In Stock: 1597044802.5MR Datasheet

Current PartRFQ

045102.5MRL

Littelfuse Inc.In Stock: 50352045102.5MRL Datasheet

Parametric EquivalentRFQ

045102.5NRL

Littelfuse Inc.In Stock: 9657045102.5NRL Datasheet

Parametric EquivalentRFQ

045302.5MR

Littelfuse Inc.In Stock: 7474045302.5MR Datasheet

Parametric EquivalentRFQ

SF-2410FP250T-2

Bourns Inc.In Stock: 935SF-2410FP250T-2 Datasheet

DirectRFQ

SF-2410HI250T-2

Bourns Inc.In Stock: 2563SF-2410HI250T-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 044802.5MR are qualified based on strict equivalence across the following critical parameters:

• Current Rating: 2.5 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 2-SMD, Square End Block (exact match required)
• Breaking Capacity @ Rated Voltage: 50 A (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Packaging Format: Tape & Reel (TR) (exact match required)

Substitutes are divided into two categories:

Parametric Equivalents (Littelfuse Series): Parts 045102.5MRL, 045102.5NRL, and 045302.5MR maintain identical electrical and mechanical specifications but differ in series designation (NANO²® 451 and NANO²® 453) and internal resistance characteristics. These parts are direct functional replacements within the Littelfuse product family.

Direct Equivalents (Bourns Manufacturer): Parts SF-2410FP250T-2 and SF-2410HI250T-2 are manufactured by Bourns Inc. and provide cross-manufacturer equivalence with identical electrical ratings and package specifications. Minor dimensional variations exist in width and height (0.102" vs. 0.106"), which remain within standard PCB footprint tolerances for 2-SMD square end block packages.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain active product status and meet the core electrical and mechanical requirements for direct substitution with the 044802.5MR.

Littelfuse Parametric Equivalents (045102.5MRL, 045102.5NRL, 045302.5MR): These parts are qualified substitutes within the Littelfuse product ecosystem. All three carry identical regulatory approvals (CSA, PSE, UL) and ROHS3 compliance. Selection among these three is based on inventory availability and internal resistance tolerance requirements. The 045102.5MRL and 045102.5NRL (NANO²® 451 series) feature lower DC cold resistance (0.0286 Ohms) compared to the 044802.5MR (0.02934 Ohms), while the 045302.5MR (NANO²® 453 series) matches this specification. Melting I²t values differ slightly across series but remain within the fast-blow response classification.

Bourns Direct Equivalents (SF-2410FP250T-2, SF-2410HI250T-2): These cross-manufacturer substitutes provide equivalent electrical performance with UL and cUL certifications. The SF-2410FP250T-2 carries standard UL/cUL approval, while the SF-2410HI250T-2 is subject to REACH regulations. Both Bourns parts exhibit slightly higher DC cold resistance (0.044 Ohms and 0.0317 Ohms respectively) and minor dimensional variations in width and height (0.102" vs. 0.106"). These dimensional differences are compatible with standard 2-SMD square end block PCB footprints.

Selection should prioritize parts with matching regulatory certifications for the target application geography and compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 045102.5MRL be used as a direct replacement for the 044802.5MR?

A: Yes. The 045102.5MRL is a parametric equivalent with identical current rating (2.5 A), voltage ratings (125 V AC/DC), response time (fast blow), mounting type (surface mount), package configuration (2-SMD square end block), and breaking capacity (50 A). Both parts operate across the same temperature range (-55°C to 125°C) and carry equivalent regulatory approvals. The primary difference is series designation (NANO²® 451 vs. NANO²® 448) and minor variations in DC cold resistance and melting I²t characteristics.

Q: Are the Bourns SF-2410FP250T-2 and SF-2410HI250T-2 compatible with the same PCB footprint as the 044802.5MR?

A: The Bourns parts are compatible with standard 2-SMD square end block footprints. Minor dimensional variations exist: Bourns parts measure 0.102" in width and height compared to 0.106" for the Littelfuse 044802.5MR. These differences fall within typical PCB design tolerances for this package type and do not require footprint modification.

Q: What is the difference between the Littelfuse NANO²® 448, 451, and 453 series?

A: All three series share identical electrical specifications for the 2.5 A, 125 V AC/DC fast-blow fuse. Series differences reflect internal design iterations and performance characteristics such as DC cold resistance and melting I²t values. Selection among series is based on inventory availability and specific application requirements for internal resistance tolerance.

Q: Do all substitute parts carry the same regulatory certifications?

A: Littelfuse parts (044802.5MR, 045102.5MRL, 045102.5NRL, 045302.5MR) carry CSA, PSE, and UL approvals. Bourns parts (SF-2410FP250T-2, SF-2410HI250T-2) carry cUL and UL certifications. The SF-2410HI250T-2 is additionally subject to REACH regulations. Verify certification requirements for your specific application geography before selection.

Q: What does ROHS3 compliance mean for these fuse parts?

A: ROHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive, restricting the use of specific hazardous materials in electrical and electronic equipment. All listed parts meet ROHS3 requirements and are suitable for applications requiring hazardous substance compliance.

Q: Can I mix different substitute parts in the same circuit board design?

A: All listed parts are electrically and mechanically equivalent for the specified 2.5 A, 125 V AC/DC fast-blow application. However, design consistency and supply chain management typically favor standardizing on a single part number per design revision to ensure manufacturing consistency and traceability.