SF-2410FP040T-2 Equivalent & Substitute Parts

Part Overview

The SF-2410FP040T-2 is a 400 mA surface mount board mount fuse manufactured by Bourns Inc. under the SinglFuse™ SF-2410FP-T series. This component is rated for 125 V AC and 125 V DC operation with fast blow response characteristics. The part is Active status and widely used in circuit protection applications requiring SMD form factor implementation. Equivalent substitute parts are available from Littelfuse Inc. to support supply chain flexibility and design alternatives.

Substiute Parts

SF-2410FP040T-2

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

Current PartRFQ

0448.400MR

Littelfuse Inc.In Stock: 61620448.400MR Datasheet

DirectRFQ

0451.400MRL

Littelfuse Inc.In Stock: 770900451.400MRL Datasheet

DirectRFQ

0453.400MR

Littelfuse Inc.In Stock: 134280453.400MR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SF-2410FP040T-2 are qualified based on the following critical parameters:

• Current Rating: 400 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 ~ 125°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

All substitute parts listed below meet these criteria and are manufactured by Littelfuse Inc. under the NANO²® series. Dimensional variations within manufacturing tolerances and differences in melting I²t and DC cold resistance do not affect functional substitution for this application category.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse substitute parts (0448.400MR, 0451.400MRL, 0453.400MR) are functionally equivalent to the SF-2410FP040T-2 based on electrical and mechanical parameters. Selection among these alternatives should be based on:

• Approval agency requirements: The SF-2410FP040T-2 carries cUL and UL certifications, while all Littelfuse substitutes carry CSA and UL certifications. Verify that CSA certification meets your application requirements if cUL was previously specified.
• Inventory availability: 0451.400MRL offers the highest stock level (77,055 pcs), followed by 0453.400MR (13,350 pcs) and 0448.400MR (6,144 pcs).
• Dimensional tolerance: All substitutes have identical length (0.240") but slightly larger width and height (0.106" vs 0.102"). Verify PCB layout accommodates the 0.004" dimensional increase.
• DC cold resistance: Values range from 0.4233 Ohms to 0.56 Ohms across all parts. This variation is within acceptable tolerance for circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can I use 0451.400MRL as a direct replacement for SF-2410FP040T-2?

A: Yes. Both parts meet identical electrical specifications: 400 mA current rating, 125 V AC/DC voltage rating, fast blow response, 50 A breaking capacity, and -55°C to 125°C operating temperature. Both are ROHS3 compliant and Active status. Verify that CSA certification (0451.400MRL) satisfies your application if cUL was previously required.

Q: What is the difference between the three Littelfuse substitutes?

A: All three parts (0448.400MR, 0451.400MRL, 0453.400MR) share identical electrical and mechanical specifications. Differences exist only in melting I²t values (0.0416, 0.0484, 0.0484 respectively) and DC cold resistance (0.4895, 0.4233, 0.56 Ohms respectively). These variations do not affect functional substitution for standard circuit protection applications.

Q: Are there dimensional compatibility issues with the substitutes?

A: The Littelfuse parts are 0.004" larger in width and height (0.106" vs 0.102") while maintaining the same length (0.240"). Verify your PCB layout and component placement tolerances accommodate this minor dimensional increase.

Q: Do all substitute parts have the same certifications?

A: No. The SF-2410FP040T-2 carries cUL and UL approvals. The Littelfuse substitutes (0448.400MR, 0451.400MRL, 0453.400MR) carry CSA and UL approvals. If your application specifically requires cUL certification, verify that CSA certification is acceptable for your regulatory requirements.

Q: Which substitute part should I select for new designs?

A: Selection depends on supply chain priorities and certification requirements. The 0451.400MRL offers the highest inventory availability (77,055 pcs). All three substitutes are functionally equivalent and Active status. Confirm that CSA certification meets your application needs.