Littelfuse 0453.400NR Surface Mount Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0453.400NR is a 400 mA, 125 V AC/DC surface mount board mount fuse in the NANO²® 453 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 status 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 within the same electrical and mechanical parameter envelope.

Substiute Parts

0453.400NR

Littelfuse Inc.In Stock: 8820453.400NR Datasheet

Current PartRFQ

0448.400MR

Littelfuse Inc.In Stock: 61620448.400MR Datasheet

Parametric EquivalentRFQ

0451.400MRL

Littelfuse Inc.In Stock: 770900451.400MRL Datasheet

Parametric EquivalentRFQ

0453.400MR

Littelfuse Inc.In Stock: 134280453.400MR Datasheet

Parametric EquivalentRFQ

SF-2410FP040T-2

Bourns Inc.In Stock: 871SF-2410FP040T-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0453.400NR are qualified based on strict electrical and mechanical parameter matching:

Qualifying Parameters for Substitution:

• Current Rating: 400 mA (exact match required)
• Voltage Rating AC: 125 V (exact match required)
• Voltage Rating DC: 125 V (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 ~ 125°C (exact match required)
• Approval Agency: CSA, UL or cUL, UL (acceptable certifications)
• RoHS Status: ROHS3 Compliant (exact match required)

Substitute Categories:

Parametric Equivalents (Littelfuse NANO²® Series): Parts 0448.400MR, 0451.400MRL, and 0453.400MR share identical electrical ratings, voltage specifications, response characteristics, and physical dimensions with the main part. These represent alternative series within the Littelfuse NANO²® product line with equivalent functional performance.

Direct Manufacturer Equivalent (Bourns Inc.): Part SF-2410FP040T-2 from Bourns SinglFuse™ SF-2410FP-T series meets all electrical and mechanical requirements with cUL and UL certifications. Physical dimensions vary slightly (0.102" W x 0.102" H versus 0.106" W x 0.106" H), remaining within acceptable tolerance for 2-SMD square end block footprints.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain active production status with full regulatory compliance. Selection between the 0453.400NR and its equivalents should be based on:

Littelfuse NANO²® Series Substitutes (0448.400MR, 0451.400MRL, 0453.400MR): These parts are interchangeable from an electrical and mechanical standpoint. The 0451.400MRL offers the highest inventory availability (77,055 pcs) and represents the optimal choice for supply chain continuity. The 0448.400MR exhibits lower melting I²t (0.0416 versus 0.0484), which may be relevant for applications with tighter thermal response requirements.

Bourns SF-2410FP040T-2: This cross-manufacturer substitute provides equivalent electrical performance with cUL certification in addition to UL approval. The slightly reduced physical dimensions (0.102" versus 0.106" width and height) remain compatible with standard 2-SMD square end block footprints. The elevated melting I²t value (0.2149) indicates a slower thermal response characteristic compared to Littelfuse equivalents.

All parts carry ROHS3 compliance, MSL Level 1 rating, and operate across the identical temperature range (-55°C ~ 125°C), ensuring functional equivalence in standard circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can the 0451.400MRL be used as a direct replacement for the 0453.400NR?

A: Yes. Both parts share identical electrical ratings (400 mA, 125 V AC/DC), response time (Fast Blow), package configuration (2-SMD, Square End Block), breaking capacity (50 A), and operating temperature range (-55°C ~ 125°C). Physical dimensions are identical. Both carry CSA and UL certifications and ROHS3 compliance.

Q: What is the difference between the Littelfuse NANO²® series substitutes?

A: The primary difference is melting I²t value. The 0448.400MR has a lower melting I²t (0.0416) compared to the 0451.400MRL and 0453.400MR (both 0.0484). This affects thermal response speed but does not impact voltage, current, or breaking capacity ratings. DC cold resistance also varies slightly between series.

Q: Is the Bourns SF-2410FP040T-2 compatible with the same PCB footprint?

A: The SF-2410FP040T-2 has slightly reduced dimensions (0.102" W x 0.102" H versus 0.106" W x 0.106" H). This minor difference remains within acceptable tolerance for standard 2-SMD square end block footprints and does not require PCB redesign.

Q: Why does the SF-2410FP040T-2 have a higher melting I²t value?

A: The melting I²t (0.2149 for SF-2410FP040T-2 versus 0.0484 for Littelfuse parts) indicates thermal response characteristics specific to the Bourns design. This does not affect the fuse's ability to protect circuits at the 400 mA rating but may result in slightly different response timing under fault conditions.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed parts—0448.400MR, 0451.400MRL, 0453.400MR, and SF-2410FP040T-2—are ROHS3 compliant with MSL Level 1 rating (unlimited moisture sensitivity protection).

Q: Which substitute part has the best inventory availability?

A: The 0451.400MRL has the highest inventory level at 77,055 pcs, followed by 0453.400MR (13,350 pcs), 0448.400MR (6,144 pcs), and SF-2410FP040T-2 (846 pcs).