Littelfuse 0448.080MR Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0448.080MR is an 80 mA, 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 2-SMD square end block configuration. The part is active in production with full CSA and UL approval certifications. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory availability, or series-specific performance characteristics.

Substiute Parts

0448.080MR

Littelfuse Inc.In Stock: 9410448.080MR Datasheet

Current PartRFQ

0451.080MRL

Littelfuse Inc.In Stock: 28730451.080MRL Datasheet

Parametric EquivalentRFQ

SF-2410FP008T-2

Bourns Inc.In Stock: 3107SF-2410FP008T-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0448.080MR are qualified based on the following electrical and mechanical parameters:

• Current Rating: 80 mA (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)
• RoHS Compliance: ROHS3 Compliant (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Substitutes are identified within the same functional category and do not require design re-qualification when these parameters remain constant. Dimensional tolerances and DC cold resistance variations within acceptable engineering limits do not preclude substitution.

Parameter Comparison

Engineering Selection Recommendations

All three parts—0448.080MR, 0451.080MRL, and SF-2410FP008T-2—meet the core electrical and mechanical requirements for 80 mA, 125 V AC/DC surface mount board mount fuse applications. Selection among these parts is based on the following factors:

Littelfuse 0448.080MR (Primary Part): Active production status with CSA and UL certifications. NANO²® 448 series design with specified DC cold resistance of 4.42 Ohms and melting I²t of 0.00043.

Littelfuse 0451.080MRL (Parametric Equivalent): Active production status with CSA and UL certifications. NANO²® 451 series design with lower DC cold resistance (4.05 Ohms) and lower melting I²t (0.00033). Identical electrical ratings and package configuration. Higher inventory availability (2770 pcs vs. 900 pcs for primary part).

Bourns SF-2410FP008T-2 (Direct Manufacturer Substitute): Active production status with cUL and UL certifications. SinglFuse™ SF-2410FP-T series design with higher DC cold resistance (4.974 Ohms) and higher melting I²t (0.0017). Dimensional variation in width and height (0.102" vs. 0.106"). Highest inventory availability (3077 pcs).

All parts carry ROHS3 compliance, MSL 1 rating, and identical operating temperature ranges. Selection should account for application-specific requirements regarding DC cold resistance, melting I²t characteristics, and PCB layout constraints related to dimensional tolerances.

Frequently Asked Questions (FAQ)

Q: Can the 0451.080MRL be used as a direct replacement for the 0448.080MR?

A: Yes. Both parts share identical electrical ratings (80 mA, 125 V AC/DC, fast-blow response), mounting type (surface mount), package configuration (2-SMD square end block), breaking capacity (50 A), operating temperature range (-55°C to 125°C), and compliance certifications (CSA, UL, ROHS3). The 0451.080MRL is a parametric equivalent within the Littelfuse NANO²® product family.

Q: What are the differences between the Littelfuse and Bourns substitutes?

A: The primary differences are DC cold resistance (Littelfuse 0448.080MR: 4.42 Ohms, 0451.080MRL: 4.05 Ohms, Bourns SF-2410FP008T-2: 4.974 Ohms) and melting I²t values (0.00043, 0.00033, and 0.0017 respectively). The Bourns part has slightly smaller width and height dimensions (0.102" vs. 0.106"). All three parts meet the same electrical and thermal specifications.

Q: Are there any certification differences between these parts?

A: The 0448.080MR and 0451.080MRL carry CSA and UL certifications. The Bourns SF-2410FP008T-2 carries cUL and UL certifications. All three parts are ROHS3 compliant and carry MSL 1 (Unlimited) ratings.

Q: Does the dimensional variation of the Bourns part affect PCB compatibility?

A: The Bourns SF-2410FP008T-2 has width and height dimensions of 0.102" (2.59mm) compared to 0.106" (2.69mm) for the Littelfuse parts. This 0.004" (0.10mm) reduction in both width and height should be evaluated against PCB pad layout and mechanical clearance requirements for the specific application.

Q: Which part should be selected for new designs?

A: Selection depends on application-specific requirements. For designs sensitive to DC cold resistance or melting I²t characteristics, the 0451.080MRL offers lower values than the primary part. For designs with dimensional constraints favoring smaller package dimensions, the Bourns SF-2410FP008T-2 provides a 0.004" reduction in width and height. All three parts are suitable for new designs with active production status and full regulatory approvals.