Littelfuse 0453020.MR Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0453020.MR is an active-status surface mount board mount fuse rated for 20 A at 65 V AC/DC with fast blow response characteristics. This component is part of the NANO²® 453 series and is designed for applications requiring reliable overcurrent protection in compact form factors. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional specifications to ensure direct compatibility in circuit board designs.

Substiute Parts

0453020.MR

Littelfuse Inc.In Stock: 8950453020.MR Datasheet

Current PartRFQ

0451020.MRL

Littelfuse Inc.In Stock: 14860451020.MRL Datasheet

Parametric EquivalentRFQ

0451020.MRSN

LittelfuseIn Stock: 312860451020.MRSN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0453020.MR are qualified based on the following critical parameters:

• Current Rating: 20 A (exact match required)
• Voltage Rating: 65 V AC and 65 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 2-SMD, Square End Block (exact match required)
• Physical Dimensions: 0.240" L x 0.106" W x 0.106" H (exact match required)
• Breaking Capacity: 100A AC, 150A DC (exact match required)
• DC Cold Resistance: 0.00244 Ohms (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Melting I²t: 154 (exact match required)
• Approval Agency: cURus (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)

The identified substitute parts belong to the NANO²® 451 series and differ only in packaging format (Cut Tape & Digi-Reel® or Tape & Reel) and inventory availability. All electrical and mechanical specifications remain identical to the primary part.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active product status and meet cURus approval requirements. The primary distinction between substitute options is packaging format and REACH compliance status.

The 0451020.MRL is supplied in Cut Tape and Digi-Reel® packaging, suitable for applications requiring flexible component sourcing or lower volume requirements. The 0451020.MRSN is supplied in Tape & Reel format with higher inventory availability (31,200 pieces) and is designated as REACH Affected, whereas the primary part 0453020.MR and substitute 0451020.MRL are REACH Unaffected.

Selection between these parts should be based on packaging requirements for manufacturing processes and regulatory compliance obligations specific to the end application and geographic market.

Frequently Asked Questions (FAQ)

Q: Can 0451020.MRL and 0451020.MRSN be used interchangeably with 0453020.MR?

A: Yes. All three parts share identical electrical ratings (20 A, 65 V AC/DC), response characteristics (Fast Blow), physical dimensions (0.240" L x 0.106" W x 0.106" H), and functional specifications. Differences exist only in packaging format and REACH status.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel® packaging?

A: Tape & Reel (TR) packaging supplies components on continuous reels suitable for high-volume automated assembly. Cut Tape (CT) & Digi-Reel® packaging provides flexibility for lower volumes or mixed component sourcing. Both formats contain identical components with the same electrical and mechanical properties.

Q: Does REACH status affect component functionality?

A: No. REACH status indicates regulatory compliance classification for substance restrictions in specific geographic markets. It does not alter electrical performance, mechanical compatibility, or functional characteristics of the component.

Q: Are all substitute parts cURus approved?

A: Yes. All three parts carry cURus approval certification, confirming compliance with applicable safety standards for board mount fuses.

Q: What is the significance of the 0.00244 Ohms DC Cold Resistance specification?

A: DC Cold Resistance defines the electrical resistance of the fuse element at room temperature under no-load conditions. This value is identical across all three parts, ensuring consistent electrical behavior in circuit applications.