Littelfuse 0451.080NRL Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0451.080NRL is an 80 mA, 125 V AC/DC surface mount board mount fuse in the NANO²® 451 series. This fast-blow fuse is designed for circuit protection in compact applications requiring SMD packaging. The part is active in production with full inventory availability. Substitute parts may be required due to supply constraints, design revisions, or manufacturing location preferences while maintaining identical electrical and mechanical performance.

Substiute Parts

0451.080NRL

Littelfuse Inc.In Stock: 7600451.080NRL 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 0451.080NRL are qualified based on the following critical parameters that must match exactly:

• Current Rating: 80 mA
• Voltage Rating (AC/DC): 125 V / 125 V
• Response Time: Fast Blow
• Mounting Type: Surface Mount
• Package / Case: 2-SMD, Square End Block
• Breaking Capacity @ Rated Voltage: 50 A
• Operating Temperature Range: -55°C to 125°C
• Approval Agencies: CSA and/or UL certification

The 0451.080NRL has two qualified substitutes: the Littelfuse 0451.080MRL (parametric equivalent within the same manufacturer series) and the Bourns SF-2410FP008T-2 (cross-manufacturer equivalent). Both parts satisfy all critical electrical and mechanical parameters required for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

All three parts are active products with full regulatory compliance. The 0451.080MRL is a direct parametric equivalent within the Littelfuse NANO²® 451 series and shares identical electrical characteristics and physical dimensions with the 0451.080NRL. Selection between these two Littelfuse variants may be based on packaging preference (Tape & Reel) or internal supply chain considerations.

The Bourns SF-2410FP008T-2 is a cross-manufacturer equivalent that meets all critical electrical and mechanical requirements. Minor dimensional variations exist (width and height reduced by 0.004" / 0.10mm), and DC cold resistance is higher at 4.974 Ohms compared to 4.05 Ohms. The melting I²t value is also higher at 0.0017 versus 0.00033. Both parts carry UL certification with cUL approval for the Bourns part. All three parts are ROHS3 compliant and carry MSL 1 rating.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts are Littelfuse NANO²® 451 series fuses with identical current rating (80 mA), voltage rating (125 V AC/DC), response time (Fast Blow), package type (2-SMD, Square End Block), breaking capacity (50 A), operating temperature range (-55°C to 125°C), and regulatory approvals (CSA, UL). Physical dimensions and DC cold resistance are identical.

Q: What are the key differences between the Littelfuse 0451.080NRL and the Bourns SF-2410FP008T-2?

A: The primary differences are manufacturer, series designation, and minor electrical characteristics. The Bourns part has slightly smaller physical dimensions (0.102" width and height versus 0.106"), higher DC cold resistance (4.974 Ohms versus 4.05 Ohms), and higher melting I²t (0.0017 versus 0.00033). All critical electrical parameters (current, voltage, breaking capacity, temperature range) and regulatory approvals remain equivalent.

Q: Are there any PCB layout considerations when substituting the Bourns SF-2410FP008T-2 for the Littelfuse parts?

A: The Bourns part has slightly reduced width and height dimensions (0.004" / 0.10mm smaller in each direction). PCB footprints designed for the Littelfuse 0451.080NRL or 0451.080MRL will accommodate the Bourns part without modification, as the smaller dimensions provide additional clearance.

Q: Do all three parts have the same regulatory approvals?

A: The Littelfuse parts (0451.080NRL and 0451.080MRL) carry CSA and UL approvals. The Bourns SF-2410FP008T-2 carries cUL and UL approvals. All three parts are ROHS3 compliant and REACH unaffected.

Q: What is the moisture sensitivity level for these fuses?

A: All three parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage or handling.