Littelfuse 0453004.NR Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0453004.NR is a 4 A, 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, high-density mounting on printed circuit boards. The part is active and in production with full regulatory approvals (CSA, PSE, UL). Equivalent and substitute parts are identified for applications where packaging format, inventory availability, or series preference necessitate alternative component selection while maintaining electrical and mechanical compatibility.

Substiute Parts

0453004.NR

Littelfuse Inc.In Stock: 8420453004.NR Datasheet

Current PartRFQ

0448004.MR

LittelfuseIn Stock: 186850448004.MR Datasheet

Parametric EquivalentRFQ

0451004.MRL

Littelfuse Inc.In Stock: 421690451004.MRL Datasheet

Parametric EquivalentRFQ

0453004.MR

Littelfuse Inc.In Stock: 213470453004.MR Datasheet

Parametric EquivalentRFQ

SF-2410FP400T-2

Bourns Inc.In Stock: 2969SF-2410FP400T-2 Datasheet

DirectRFQ

SF-2410HI400T-2

Bourns Inc.In Stock: 2703SF-2410HI400T-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0453004.NR are grouped into two categories based on substitution criteria:

Parametric Equivalents (Littelfuse NANO²® Series): Parts 0448004.MR, 0451004.MRL, and 0453004.MR share identical electrical ratings (4 A, 125 V AC/DC, fast-blow response), mechanical dimensions (0.240" L x 0.106" W x 0.106" H), package type (2-SMD, Square End Block), and regulatory approvals. These parts differ only in packaging format (Tape & Reel vs. Cut Tape & Digi-Reel®) and series designation within the NANO²® family. DC cold resistance values remain within acceptable tolerance ranges (0.01577 to 0.016 Ohms). Melting I²t values show minor variation (3.152 to 3.97), which does not affect functional compatibility for standard circuit protection applications.

Direct Manufacturer Equivalents (Bourns SinglFuse™ Series): Parts SF-2410FP400T-2 and SF-2410HI400T-2 are manufactured by Bourns Inc. and provide electrical and mechanical equivalence to the 0453004.NR. Both maintain identical current rating (4 A), voltage rating (125 V AC/DC), response time (fast-blow), mounting type (surface mount), and package configuration (2-SMD, Square End Block). Dimensional tolerance is minimal (0.240" L x 0.102" W x 0.102" H vs. 0.106" W x 0.106" H), and both are UL and cUL approved. The SF-2410HI400T-2 exhibits significantly higher melting I²t (27.056 vs. 3.152), indicating a different thermal response characteristic suitable for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain active product status and meet the electrical and mechanical requirements of the 0453004.NR. Selection among equivalents is determined by specific application constraints:

Littelfuse NANO²® Series (0448004.MR, 0451004.MRL, 0453004.MR): These parts are recommended when Littelfuse component standardization is required or when existing supply chain relationships favor this manufacturer. All three parts carry CSA, PSE, and UL approvals. The 0451004.MRL offers Cut Tape and Digi-Reel® packaging options, which may be advantageous for lower-volume production runs or just-in-time inventory management. The 0453004.MR is identical to the main part except for packaging format (Tape & Reel).

Bourns SinglFuse™ Series (SF-2410FP400T-2, SF-2410HI400T-2): These parts are suitable for applications where Bourns component qualification is established or where alternative sourcing is required. Both carry UL and cUL approvals. The SF-2410FP400T-2 provides thermal response characteristics comparable to the 0453004.NR (melting I²t 3.9744 vs. 3.152). The SF-2410HI400T-2 exhibits substantially higher melting I²t (27.056), indicating slower thermal response and suitability for applications with higher inrush current tolerance. Note that SF-2410HI400T-2 carries REACH Affected status, requiring compliance verification for regulated substance content in specific end-use applications.

Frequently Asked Questions (FAQ)

Q: Can the 0448004.MR be used as a direct replacement for the 0453004.NR?

A: Yes. Both parts share identical electrical ratings (4 A, 125 V AC/DC, fast-blow), mechanical dimensions (0.240" L x 0.106" W x 0.106" H), and package type (2-SMD, Square End Block). The primary difference is series designation (NANO²® 448 vs. NANO²® 453) and DC cold resistance tolerance (0.01577 vs. 0.016 Ohms), which does not affect functional compatibility. Both carry CSA, PSE, and UL approvals.

Q: What is the difference between the Littelfuse and Bourns substitute parts?

A: Littelfuse parts (0448004.MR, 0451004.MRL, 0453004.MR) are from the NANO²® series and maintain identical dimensions and thermal characteristics. Bourns parts (SF-2410FP400T-2, SF-2410HI400T-2) are from the SinglFuse™ series with slightly smaller width and height (0.102" vs. 0.106"). Both manufacturers' parts meet the same electrical specifications and regulatory approvals. Selection depends on established supplier relationships and component qualification requirements.

Q: Why does the SF-2410HI400T-2 have a significantly higher melting I²t value?

A: The SF-2410HI400T-2 is designed with a slower thermal response (melting I²t 27.056 vs. 3.152 for the 0453004.NR). This characteristic allows the fuse to tolerate higher inrush currents without nuisance operation, making it suitable for applications with transient current spikes. Selection of this part requires confirmation that the application's fault current protection requirements are compatible with this slower response time.

Q: Are there packaging format differences among the Littelfuse equivalents?

A: Yes. The 0453004.NR and 0448004.MR are supplied in Tape & Reel (TR) format. The 0451004.MRL is available in Cut Tape (CT) and Digi-Reel® format, which provides flexibility for different production volume requirements and inventory management strategies. All three parts are electrically and mechanically equivalent.

Q: What is the significance of the REACH Affected status on the SF-2410HI400T-2?

A: REACH Affected status indicates that this part may contain substances subject to REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) regulations. Applications subject to REACH compliance requirements must verify that the SF-2410HI400T-2 meets specific regulatory obligations for the intended end-use market. The Littelfuse equivalents carry REACH Unaffected status.

Q: Can these fuses be used interchangeably on the same PCB assembly?

A: Yes, provided that PCB pad dimensions accommodate the slight variation in Bourns part width and height (0.102" vs. 0.106"). Littelfuse NANO²® parts (0448004.MR, 0451004.MRL, 0453004.MR) share identical dimensions with the 0453004.NR and require no PCB layout modification. Bourns SinglFuse™ parts have marginally smaller footprints and are compatible with standard 2-SMD, Square End Block pad patterns designed for the 0453004.NR.