Littelfuse 0448.375MR Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0448.375MR is a 375 mA, 125 V AC/DC surface mount board mount fuse in the NANO²® 448 series. This fast-blow fuse is designed for circuit protection in applications requiring compact SMD packaging with a 2-SMD square end block configuration. The part is active in production with full CSA and UL approval certifications. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance characteristics to support design flexibility and supply chain continuity.

Substiute Parts

0448.375MR

Littelfuse Inc.In Stock: 16820448.375MR Datasheet

Current PartRFQ

0451.375MRL

Littelfuse Inc.In Stock: 109410451.375MRL Datasheet

Parametric EquivalentRFQ

0453.375MR

Littelfuse Inc.In Stock: 190880453.375MR Datasheet

Parametric EquivalentRFQ

SF-2410FP0375T-2

Bourns Inc.In Stock: 2796SF-2410FP0375T-2 Datasheet

DirectRFQ

SF-2410HI0375T-2

Bourns Inc.In Stock: 2525SF-2410HI0375T-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0448.375MR are classified into two categories based on substitution criteria:

Parametric Equivalents (Littelfuse Series): Parts 0451.375MRL and 0453.375MR are parametric equivalents manufactured by Littelfuse Inc. These parts share identical electrical ratings (375 mA, 125 V AC/DC), mechanical dimensions (0.240" L x 0.106" W x 0.106" H), mounting type (surface mount), package configuration (2-SMD square end block), response time (fast blow), breaking capacity (50 A), operating temperature range (-55°C to 125°C), and regulatory approvals (CSA, UL). Differences exist in melting I²t values and DC cold resistance, which reflect design variations within the NANO²® product family but do not affect functional interchangeability for the specified electrical parameters.

Direct Manufacturer Equivalents (Bourns Inc. Series): Parts SF-2410FP0375T-2 and SF-2410HI0375T-2 are direct equivalents from Bourns Inc. in the SinglFuse™ SF-2410 series. These parts match all critical electrical parameters (375 mA, 125 V AC/DC), mounting configuration (surface mount), package type (2-SMD square end block), response time (fast blow), breaking capacity (50 A), and operating temperature range (-55°C to 125°C). Mechanical dimensions are nearly identical with minor width and height variations (0.102" vs. 0.106"). Both parts carry UL and cUL certifications. Differences in melting I²t and DC cold resistance reflect manufacturer-specific design approaches but maintain functional compatibility within the specified parameter set.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain active production status with full regulatory compliance. Selection between Littelfuse parametric equivalents (0451.375MRL, 0453.375MR) and Bourns direct equivalents (SF-2410FP0375T-2, SF-2410HI0375T-2) is based on supply availability, inventory levels, and design validation history.

Littelfuse parametric equivalents offer identical mechanical dimensions and are certified by CSA and UL. The 0453.375MR provides the highest inventory availability (19,040 pcs) among all options.

Bourns direct equivalents carry cUL and UL certifications and feature minor mechanical dimension variations (0.102" width and height versus 0.106"). The SF-2410HI0375T-2 is subject to REACH compliance requirements, while the main part and other substitutes are REACH unaffected.

All parts are ROHS3 compliant with MSL 1 rating and support the full operating temperature range of -55°C to 125°C. Selection should account for PCB layout constraints related to the minor dimensional differences between Littelfuse and Bourns packages.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0451.375MRL and 0453.375MR be used interchangeably with the 0448.375MR?

A: Yes. Both parts are parametric equivalents with identical electrical ratings (375 mA, 125 V AC/DC), mechanical dimensions, mounting configuration, and regulatory certifications. Differences in melting I²t and DC cold resistance reflect design variations within the NANO²® series but do not affect functional interchangeability for the specified electrical parameters.

Q: What are the key differences between Littelfuse and Bourns substitute options?

A: Littelfuse parametric equivalents (0451.375MRL, 0453.375MR) maintain identical mechanical dimensions (0.106" width and height). Bourns direct equivalents (SF-2410FP0375T-2, SF-2410HI0375T-2) feature slightly smaller width and height dimensions (0.102"). Both manufacturers provide UL certification; Littelfuse includes CSA approval, while Bourns provides cUL approval. Melting I²t values differ between manufacturers, reflecting design-specific thermal characteristics.

Q: Are there any REACH compliance considerations for substitute selection?

A: The SF-2410HI0375T-2 is subject to REACH compliance requirements. The main part (0448.375MR), Littelfuse parametric equivalents (0451.375MRL, 0453.375MR), and the Bourns SF-2410FP0375T-2 are REACH unaffected. Design requirements may dictate REACH status considerations.

Q: Do all substitute parts support the same operating temperature range?

A: Yes. All parts, including the main part and all substitutes, support the operating temperature range of -55°C to 125°C.

Q: What packaging format is used for all parts in this comparison?

A: All parts are supplied in Tape & Reel (TR) packaging suitable for automated assembly processes. All parts feature 2-SMD square end block package configuration for surface mount applications.

Q: Are there inventory availability differences between substitute options?

A: Yes. The 0453.375MR offers the highest inventory availability (19,040 pcs), followed by 0451.375MRL (10,911 pcs), SF-2410FP0375T-2 (2,755 pcs), and SF-2410HI0375T-2 (2,484 pcs). The main part 0448.375MR has 1,661 pcs in stock.