Littelfuse 0448008.MR Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0448008.MR is an 8A 125VAC/125VDC surface mount board mount fuse in the NANO²® 448 series. This fast-blow fuse is designed for circuit protection in applications requiring compact 2-SMD, square end block packaging. The part is active in production with full compliance to RoHS3, REACH, and international safety approvals (CSA, UL, PSE). Substitute parts are identified for applications where alternative packaging formats, series variants, or cross-manufacturer options are required while maintaining equivalent electrical and mechanical performance.

Substiute Parts

0448008.MR

Littelfuse Inc.In Stock: 22820448008.MR Datasheet

Current PartRFQ

0451008.MRL

Littelfuse Inc.In Stock: 604240451008.MRL Datasheet

Parametric EquivalentRFQ

0451008.MRSN

Littelfuse Inc.In Stock: 19450451008.MRSN Datasheet

Parametric EquivalentRFQ

0453008.MR

Littelfuse Inc.In Stock: 110780453008.MR Datasheet

Parametric EquivalentRFQ

SF-2410FP800T-2

Bourns Inc.In Stock: 2748SF-2410FP800T-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0448008.MR are classified based on the following substitution criteria:

Parametric Equivalents (Littelfuse NANO²® Series):

• 0451008.MRL, 0451008.MRSN, and 0453008.MR maintain identical electrical specifications: 8A current rating, 125VAC/125VDC voltage rating, fast-blow response, 50A breaking capacity, and 2-SMD square end block package.
• These parts differ in packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) and series designation (NANO²® 451 and NANO²® 453 versus NANO²® 448).
• Melting I²t values vary slightly (20.23 for 451/453 series versus 18.33 for 448 series) and DC cold resistance differs marginally (0.0077 Ohms versus 0.0078 Ohms).
• All maintain identical approval agencies (CSA, UL, PSE) and compliance status.

Direct Manufacturer Equivalent (Cross-Manufacturer):

• SF-2410FP800T-2 (Bourns Inc., SinglFuse™ SF-2410FP-T series) provides electrical equivalence with identical current, voltage, and response characteristics.
• Physical dimensions are nearly identical (0.240" L x 0.102" W x 0.102" H versus 0.240" L x 0.106" W x 0.106" H).
• Melting I²t (16.758) and DC cold resistance (0.0085 Ohms) differ from the primary part, reflecting manufacturer-specific design.
• Approval agencies are cUL and UL (subset of Littelfuse approvals).

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain active product status and full compliance with RoHS3 and REACH requirements. Selection between Littelfuse NANO²® series variants (0451008.MRL, 0451008.MRSN, 0453008.MR) is determined by packaging requirements: Cut Tape & Digi-Reel® format for 0451008.MRL, or Tape & Reel format for 0451008.MRSN and 0453008.MR. All three Littelfuse variants carry CSA and UL approvals; 0451008.MRSN includes METI and UR certifications.

The Bourns SF-2410FP800T-2 provides cross-manufacturer equivalence with cUL and UL approvals. Selection of this part is appropriate where Bourns supply chain or inventory availability is prioritized. Dimensional tolerance differences (0.102" versus 0.106" width and height) are within typical PCB footprint design margins for 2-SMD square end block packages.

Melting I²t variations (16.758 to 20.23) reflect manufacturer-specific thermal characteristics and do not affect substitutability for standard 8A circuit protection applications within the specified voltage and temperature operating ranges.

Frequently Asked Questions (FAQ)

Q: Can 0451008.MRL be used as a direct replacement for 0448008.MR?

A: Yes. Both parts share identical electrical specifications (8A, 125VAC/125VDC, fast-blow, 50A breaking capacity) and physical package (2-SMD, square end block). The primary difference is packaging format: 0451008.MRL is supplied in Cut Tape & Digi-Reel® format, while 0448008.MR is supplied in Tape & Reel format. PCB footprint compatibility is identical.

Q: What is the significance of the melting I²t difference between 0448008.MR (18.33) and 0451008.MRL (20.23)?

A: Melting I²t represents the thermal energy required to melt the fuse element. The variation reflects manufacturer design differences within the same electrical rating class. Both parts function as 8A fast-blow fuses and are suitable for equivalent circuit protection applications.

Q: Is the Bourns SF-2410FP800T-2 mechanically compatible with the Littelfuse 0448008.MR?

A: The Bourns part has slightly smaller width and height dimensions (0.102" versus 0.106"). Both use identical 2-SMD square end block package geometry and 0.240" length. PCB footprint compatibility depends on specific design tolerances; verify footprint clearances for your application.

Q: Which substitute part has the broadest approval coverage?

A: The Littelfuse 0451008.MRSN includes CSA, METI, and UR approvals. The 0451008.MRL and 0453008.MR include CSA, PSE, and UL approvals. The Bourns SF-2410FP800T-2 includes cUL and UL approvals. Selection depends on regional regulatory requirements for your end application.

Q: Can I mix different substitute parts in the same production run?

A: All substitute parts meet identical electrical specifications and are mechanically compatible within standard PCB design tolerances. However, verify that your specific PCB layout accommodates the minor dimensional variations (particularly the Bourns part's 0.102" versus 0.106" width/height) before mixing parts in production.