Littelfuse 0453.400MR Surface Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0453.400MR is a 400 mA, 125 V AC/DC surface mount board fuse in the NANO²® 453 series. This fast-blow fuse is designed for circuit protection in applications requiring compact, high-density mounting on printed circuit boards. The part is currently active in production with full CSA and UL approval certifications. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility is required while maintaining identical electrical and mechanical performance specifications.

Substiute Parts

0453.400MR

Littelfuse Inc.In Stock: 134280453.400MR 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

SF-2410FP040T-2

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

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0453.400MR are qualified based on the following critical parameters that must remain identical:

• Current Rating: 400 mA
• Voltage Rating: 125 V AC and 125 V DC
• Response Time: Fast Blow
• Mounting Type: Surface Mount
• Package / Case: 2-SMD, Square End Block
• Breaking Capacity: 50 A at rated voltage
• Operating Temperature Range: -55°C to 125°C
• Approval Certifications: CSA and/or UL

Parametric equivalents within the Littelfuse NANO²® family (0448.400MR and 0451.400MRL) maintain all critical electrical and mechanical specifications. The Bourns SF-2410FP040T-2 from the SinglFuse™ SF-2410FP-T series provides cross-manufacturer equivalency with identical performance parameters and cUL/UL certifications.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain active product status with full regulatory compliance. The Littelfuse NANO²® family parts (0448.400MR and 0451.400MRL) are direct parametric equivalents manufactured by the same supplier, ensuring consistency in design and performance characteristics. The Bourns SF-2410FP040T-2 provides cross-manufacturer equivalency with cUL and UL certifications, meeting the same regulatory requirements as the primary part.

Selection between these parts should be based on availability, supply chain considerations, and existing qualification status within your design documentation. All parts are ROHS3 compliant and carry identical electrical performance specifications for the 400 mA, 125 V AC/DC fast-blow fuse application.

Frequently Asked Questions (FAQ)

Q: Can the 0448.400MR be used as a direct replacement for the 0453.400MR?

A: Yes. Both parts share identical electrical ratings (400 mA, 125 V AC/DC), response time (fast blow), mounting type (surface mount), package configuration (2-SMD, square end block), breaking capacity (50 A), and operating temperature range (-55°C to 125°C). Both carry CSA and UL certifications.

Q: What is the difference between the 0451.400MRL and 0453.400MR?

A: The parts are parametric equivalents with identical electrical and mechanical specifications. The primary difference is the series designation (NANO²® 451 versus NANO²® 453) and DC cold resistance values (0.4233 Ohms versus 0.56 Ohms). Both meet all functional requirements for 400 mA, 125 V AC/DC circuit protection.

Q: Is the Bourns SF-2410FP040T-2 compatible with the Littelfuse 0453.400MR?

A: Yes. The SF-2410FP040T-2 meets all critical electrical and mechanical parameters: 400 mA current rating, 125 V AC/DC voltage rating, fast-blow response, surface mount configuration, 2-SMD square end block package, 50 A breaking capacity, and -55°C to 125°C operating temperature. The part carries cUL and UL certifications. Minor dimensional variation exists (0.102" versus 0.106" width and height), but this does not affect PCB footprint compatibility for standard 2-SMD fuse land patterns.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (0448.400MR, 0451.400MRL, and SF-2410FP040T-2) are ROHS3 compliant, matching the environmental compliance status of the 0453.400MR.

Q: What certifications do these fuses carry?

A: The Littelfuse parts (0453.400MR, 0448.400MR, 0451.400MRL) carry CSA and UL approvals. The Bourns SF-2410FP040T-2 carries cUL and UL approvals. All certifications are valid for 400 mA, 125 V AC/DC board mount fuse applications.