Littelfuse 0473004.YRT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0473004.YRT1 is a 4 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 ongoing design support and procurement. The part maintains slow-blow response characteristics suitable for circuit protection applications requiring transient current tolerance. Equivalent substitute parts are available in active product status with identical electrical and mechanical specifications.

Substiute Parts

0473004.YRT1

Littelfuse Inc.In Stock: 10280473004.YRT1 Datasheet

Current PartRFQ

0473004.HAT1L

Littelfuse Inc.In Stock: 10480473004.HAT1L Datasheet

Parametric EquivalentRFQ

0473004.MAT1L

Littelfuse Inc.In Stock: 383740473004.MAT1L Datasheet

Parametric EquivalentRFQ

0473004.MRT1L

LittelfuseIn Stock: 17760473004.MRT1L Datasheet

Parametric EquivalentRFQ

0473004.YRT1L

Littelfuse Inc.In Stock: 84250473004.YRT1L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 0473004.YRT1 is based on strict parametric equivalence across all electrical and mechanical characteristics. The substitute parts maintain identical current ratings (4 A), voltage ratings (125 V AC/DC), response time classification (Slow Blow), physical dimensions (0.135" Dia x 0.280" L), breaking capacity (50 A), melting I²t value (35), DC cold resistance (0.0194 Ohms), operating temperature range (-55°C ~ 125°C), and regulatory approvals (CSA, PSE, UR).

All substitute parts are members of the same PICO® II 473 series and employ identical through-hole axial mounting technology. The primary differentiator among substitutes is packaging format (Cut Tape) and product status (Active), with variations in RoHS compliance status and REACH applicability. These differences do not affect electrical or mechanical interchangeability.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts (0473004.HAT1L, 0473004.MAT1L, 0473004.MRT1L, 0473004.YRT1L) are direct parametric equivalents to the obsolete 0473004.YRT1. Selection among these active alternatives should be based on procurement availability and regulatory compliance requirements.

For applications subject to RoHS3 compliance mandates, all substitute parts satisfy this requirement, whereas the original part does not. The 0473004.MAT1L offers the highest inventory availability (38,315 pcs) among active substitutes. The 0473004.YRT1L maintains REACH Affected status, while 0473004.HAT1L and 0473004.MAT1L are REACH Unaffected. The 0473004.MRT1L is listed as REACH Unaffected by Littelfuse.

All substitutes maintain identical regulatory approvals (CSA, PSE, UR) and are packaged in Cut Tape format, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Are all substitute parts electrically interchangeable with the original 0473004.YRT1?

A: Yes. All substitute parts maintain identical electrical specifications: 4 A current rating, 125 V AC/DC voltage rating, slow-blow response time, 50 A breaking capacity, 35 melting I²t, and 0.0194 Ohms DC cold resistance.

Q: What is the physical compatibility of substitute parts?

A: All substitute parts share identical mechanical specifications with the original part: 0.135" diameter by 0.280" length (3.43mm x 7.11mm), axial package style, and through-hole mounting configuration. Direct board-level substitution is supported without PCB redesign.

Q: Why is the original part classified as obsolete?

A: The 0473004.YRT1 is no longer in active production. All substitute parts are active products from the same PICO® II 473 series and provide equivalent functionality for new designs and legacy system support.

Q: What is the difference between the substitute parts?

A: All substitutes are parametrically identical. Differences exist only in packaging format (all are Cut Tape), inventory levels, and regulatory status variations (RoHS3 compliance and REACH applicability). These differences do not affect electrical or mechanical performance.

Q: Are substitute parts suitable for new product designs?

A: Yes. All substitute parts carry Active product status and maintain full regulatory approvals (CSA, PSE, UR). The 0473004.MAT1L, 0473004.MRT1L, and 0473004.YRT1L are recommended for new designs due to superior inventory availability and active manufacturing status.

Q: What certifications do substitute parts carry?

A: All substitute parts maintain CSA, PSE, and UR approvals identical to the original part. Additionally, all substitutes are ROHS3 compliant, exceeding the non-compliant status of the original 0473004.YRT1.