Littelfuse 0452001.MR Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0452001.MR is a 1 A, 125 V AC/DC surface mount board mount fuse in the NANO²® 452 series, featuring a 2-SMD square end block package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The fuse provides slow blow response characteristics with a 50 A breaking capacity at rated voltage, suitable for circuit protection in low-voltage electronic equipment.

Substiute Parts

0452001.MR

Littelfuse Inc.In Stock: 22060452001.MR Datasheet

Current PartRFQ

0452001.MRL

Littelfuse Inc.In Stock: 2212600452001.MRL Datasheet

DirectRFQ

0449001.MR

Littelfuse Inc.In Stock: 24250449001.MR Datasheet

Parametric EquivalentRFQ

0452001.NRL

Littelfuse Inc.In Stock: 135650452001.NRL Datasheet

Parametric EquivalentRFQ

0454001.MR

Littelfuse Inc.In Stock: 423150454001.MR Datasheet

Parametric EquivalentRFQ

0454001.NR

Littelfuse Inc.In Stock: 11460454001.NR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0452001.MR are qualified based on the following critical parameters:

• Current Rating: 1 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Slow 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)
• Size / Dimension: 0.240" L x 0.106" W x 0.106" H (exact match required)

All substitute parts listed maintain these core electrical and mechanical parameters. Variations in series designation (NANO²® 452, NANO²® 449, NANO²® 454), packaging format (Cut Tape & Digi-Reel®, Tape & Reel), and compliance status are secondary considerations that do not affect functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 0452001.MRL

The 0452001.MRL is the direct equivalent to the obsolete 0452001.MR, maintaining identical electrical and mechanical specifications within the same NANO²® 452 series. This part carries Active product status and ROHS3 compliance, making it the preferred choice for new designs and production transitions. The Cut Tape & Digi-Reel® packaging format provides flexibility for both manual and automated assembly operations.

Secondary Recommendations: 0452001.NRL and 0454001.MR

The 0452001.NRL offers identical electrical performance to the main part with Tape & Reel packaging, suitable for high-volume automated assembly. The 0454001.MR, from the NANO²® 454 series, maintains all critical electrical parameters and is available in Cut Tape & Digi-Reel® format with Active status and ROHS3 compliance.

Alternative Recommendation: 0454001.NR

The 0454001.NR provides functional equivalence with Tape & Reel packaging and Active product status. This part is suitable for applications requiring high-volume tape format delivery.

Parametric Equivalent: 0449001.MR

The 0449001.MR from the NANO²® 449 series maintains all critical electrical parameters including 1 A current rating, 125 V AC/DC voltage rating, and 50 A breaking capacity. Minor variations in Melting I²t (1.76 versus 1.98) and DC Cold Resistance (0.2516 Ω versus 0.225 Ω) do not affect functional compatibility. This part carries cULus and PSE certifications and is available in Tape & Reel format with Active status and ROHS3 compliance.

All substitute parts are manufactured by Littelfuse Inc. and maintain the same 2-SMD square end block package geometry and surface mount mounting type.

Frequently Asked Questions (FAQ)

Q: Can I use 0452001.MRL as a direct replacement for the obsolete 0452001.MR?

A: Yes. The 0452001.MRL is electrically and mechanically identical to the 0452001.MR, with the primary difference being product status (Active versus Obsolete) and RoHS compliance (ROHS3 Compliant versus non-compliant). Both parts share the same NANO²® 452 series designation and identical electrical ratings.

Q: What is the difference between the packaging formats listed?

A: Cut Tape (CT) & Digi-Reel® packaging is suitable for both manual pick-and-place and automated assembly operations. Tape & Reel (TR) packaging is optimized for high-volume automated assembly lines. The electrical and mechanical specifications remain identical regardless of packaging format.

Q: Are the NANO²® 449 and NANO²® 454 series parts fully compatible with the NANO²® 452?

A: Yes, for the specified electrical parameters. The 0449001.MR and 0454001.MR maintain identical current rating (1 A), voltage rating (125 V AC/DC), response time (Slow Blow), package geometry (2-SMD, Square End Block), and breaking capacity (50 A). Minor variations in Melting I²t and DC Cold Resistance do not affect functional substitution.

Q: What certifications should I verify for my application?

A: The main part 0452001.MR carries CSA, PSE, and UR certifications. The substitute parts maintain these certifications with variations: 0452001.MRL and 0452001.NRL retain CSA, PSE, and UR; 0449001.MR carries cULus and PSE; 0454001.MR and 0454001.NR carry CSA, PSE, and UL. Verify that the selected part's certification set meets your application requirements.

Q: Is RoHS compliance a critical factor for substitution?

A: RoHS compliance status depends on your application and regional requirements. The obsolete 0452001.MR is RoHS non-compliant, while all active substitute parts (0452001.MRL, 0452001.NRL, 0449001.MR, 0454001.MR, 0454001.NR) are ROHS3 Compliant. For new designs and production, ROHS3 compliant parts are recommended.

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

A: Yes, all listed substitute parts are functionally equivalent and maintain identical electrical and mechanical specifications. However, for consistency in procurement, testing, and documentation, using a single part number across an assembly is recommended.