Littelfuse 0473003.MRT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0473003.MRT1 is a 3 A, 125 V AC/DC board mount axial fuse from the PICO® II 473 series. This component is classified as obsolete, which necessitates identification of active equivalent alternatives for new designs and ongoing production requirements. The substitute parts listed maintain identical electrical and mechanical specifications while offering improved product status and compliance certifications.

Substiute Parts

0473003.MRT1

LittelfuseIn Stock: 8620473003.MRT1 Datasheet

Current PartRFQ

0473003.HAT1L

Littelfuse Inc.In Stock: 10640473003.HAT1L Datasheet

Parametric EquivalentRFQ

0473003.MAT1L

Littelfuse Inc.In Stock: 18940473003.MAT1L Datasheet

Parametric EquivalentRFQ

0473003.MRT1L

Littelfuse Inc.In Stock: 24630473003.MRT1L Datasheet

Parametric EquivalentRFQ

0473003.YRT1L

LittelfuseIn Stock: 201860473003.YRT1L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0473003.MRT1 is determined by strict equivalence across the following parameters:

• Current Rating: 3 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: Through Hole (exact match required)
• Package / Case: Axial (exact match required)
• Breaking Capacity @ Rated Voltage: 50 A (exact match required)
• Melting I²t: 21 (exact match required)
• Size / Dimension: 0.135" Dia x 0.280" L (3.43mm x 7.11mm) (exact match required)
• DC Cold Resistance: 0.038 Ohms (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Approval Agencies: CSA, PSE, UR (exact match required)

All substitute parts listed below meet these criteria. Packaging format (Cut Tape vs. other formats) does not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts (0473003.HAT1L, 0473003.MAT1L, 0473003.MRT1L, 0473003.YRT1L) are electrically and mechanically equivalent to the obsolete 0473003.MRT1. Selection among these alternatives should be based on the following factors:

Product Status: All substitute parts carry Active product status, ensuring long-term availability and manufacturing support compared to the Obsolete status of the original part.

Compliance: All substitute parts are ROHS3 Compliant and REACH Unaffected, providing improved regulatory alignment for new designs and production environments subject to environmental compliance requirements.

Packaging: All substitute parts are supplied in Cut Tape (CT) packaging. Packaging format does not affect functional compatibility; selection should align with assembly process requirements.

Inventory Availability: Substitute parts demonstrate varying inventory levels, with 0473003.YRT1L offering the highest stock position (20100 Pcs), followed by 0473003.MRT1L (2400 Pcs), 0473003.MAT1L (1851 Pcs), and 0473003.HAT1L (1030 Pcs).

Frequently Asked Questions (FAQ)

Q: Are all listed substitute parts electrically identical to the 0473003.MRT1?

A: Yes. All substitute parts maintain identical electrical specifications: 3 A current rating, 125 V AC/DC voltage rating, Slow Blow response time, 50 A breaking capacity, 21 melting I²t, and 0.038 Ohms DC cold resistance.

Q: Are all substitute parts mechanically compatible with the original design?

A: Yes. All substitute parts share identical mechanical specifications: Through Hole mounting, Axial package format, and 0.135" Dia x 0.280" L (3.43mm x 7.11mm) dimensions. Direct board-level substitution is supported without design modification.

Q: What is the difference between the substitute part numbers?

A: The substitute parts differ only in packaging format designation (HAT1L, MAT1L, MRT1L, YRT1L) and inventory availability. All are supplied in Cut Tape (CT) packaging. The suffix designations reflect internal Littelfuse manufacturing and distribution codes that do not affect electrical or mechanical performance.

Q: Why should I transition from the obsolete 0473003.MRT1 to an active substitute?

A: The original part is classified as Obsolete, which indicates discontinued manufacturing and limited future availability. Active substitute parts ensure continued supply chain access, manufacturing support, and compliance with current regulatory standards (ROHS3, REACH).

Q: Can I use these parts interchangeably in existing designs?

A: Yes. The substitute parts are direct functional equivalents. No circuit design changes, PCB modifications, or assembly process adjustments are required for substitution.

Q: Are there any thermal or performance differences between the substitute parts?

A: No. All substitute parts operate across the identical temperature range (-55°C ~ 125°C) and maintain the same thermal and electrical performance characteristics.