Littelfuse 015404.6DRTL Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 015404.6DRTL is a 4.6 A, 125 V AC/DC surface mount board mount fuse in the OMNI-BLOK® 154TL series. This slow blow fuse is designed for circuit protection in applications requiring a 2-SMD square end block configuration with holder. The part is actively manufactured and maintains robust inventory levels. Substitute parts are identified when equivalent electrical and mechanical parameters are required for design flexibility, supply chain continuity, or manufacturing process optimization.

Substiute Parts

015403.5DRTL

Littelfuse Inc.In Stock: 1434015403.5DRTL Datasheet

Current PartRFQ

015403.5DRT

Littelfuse Inc.In Stock: 5469015403.5DRT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The substitute part 015404.6DRT is classified as a parametric equivalent based on the following criteria:

Matching Electrical Parameters:

• Current Rating: 4.6 A (identical)
• Voltage Rating AC/DC: 125 V / 125 V (identical)
• Response Time: Slow Blow (identical)
• Breaking Capacity: 50 A (identical)
• Melting I²t: 26.53 (identical)
• DC Cold Resistance: 0.0224 Ohms (identical)

Matching Mechanical Parameters:

• Mounting Type: Requires Holder, Surface Mount (identical)
• Package / Case: 2-SMD, Square End Block with Holder (identical)
• Physical Dimensions: 0.383" L x 0.198" W x 0.150" H (identical)

Matching Compliance & Environmental Parameters:

• Operating Temperature Range: -55°C ~ 125°C (identical)
• Approval Agencies: PSE, UL (identical)
• RoHS Status: ROHS3 Compliant (identical)
• MSL: 1 (Unlimited) (identical)

The primary difference between these parts is the series designation: 015404.6DRTL belongs to the OMNI-BLOK® 154TL series, while 015404.6DRT belongs to the OMNI-BLOK® 154T series. Both series share identical electrical, mechanical, and environmental specifications, making them functionally interchangeable in circuit protection applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 015404.6DRTL and 015404.6DRT are active products manufactured by Littelfuse Inc. with identical electrical, mechanical, and environmental specifications. Selection between these parts should be based on the following factors:

Supply Chain Availability: The 015404.6DRT maintains higher inventory levels (5445 Pcs) compared to the 015404.6DRTL (1326 Pcs), making it suitable for applications where supply continuity is a priority.

Compliance & Certification: Both parts carry PSE and UL approvals and are ROHS3 compliant, meeting equivalent regulatory requirements for circuit protection applications.

Series Compatibility: The difference in series designation (154TL vs. 154T) reflects manufacturing evolution within the OMNI-BLOK® product line. Both series maintain identical performance characteristics and are suitable for direct substitution in existing designs.

Packaging & Handling: Both parts are supplied in Tape & Reel (TR) packaging with MSL 1 (Unlimited) moisture sensitivity, requiring identical storage and handling procedures.

Frequently Asked Questions (FAQ)

Q: Can 015404.6DRT be used as a direct replacement for 015404.6DRTL in existing circuit designs?

A: Yes. Both parts are parametric equivalents with identical current ratings (4.6 A), voltage ratings (125 V AC/DC), response time (Slow Blow), breaking capacity (50 A), physical dimensions, and thermal operating range (-55°C ~ 125°C). They are functionally interchangeable in all circuit protection applications.

Q: What is the difference between the 154TL and 154T series designations?

A: The series designation reflects product line variants within Littelfuse's OMNI-BLOK® fuse family. Both 154TL and 154T series maintain identical electrical and mechanical specifications for the 4.6 A, 125 V rating. The difference does not affect performance or compatibility.

Q: Are both parts suitable for surface mount assembly?

A: Yes. Both 015404.6DRTL and 015404.6DRT are configured for surface mount applications with 2-SMD, square end block packaging. Both require a compatible holder for installation and are supplied in Tape & Reel (TR) format suitable for automated pick-and-place assembly.

Q: Do both parts meet the same regulatory approvals?

A: Yes. Both parts carry PSE and UL approvals and are ROHS3 compliant. They meet equivalent regulatory requirements for circuit protection in AC and DC applications up to 125 V.

Q: What is the melting I²t value, and why is it important for substitution?

A: The melting I²t value of 26.53 represents the thermal energy required to melt the fuse element. Both parts share this identical value, ensuring equivalent protection characteristics and response behavior in overcurrent conditions.

Q: Are there any differences in moisture sensitivity or storage requirements?

A: No. Both parts have MSL 1 (Unlimited) moisture sensitivity level, indicating no moisture-related storage restrictions. Both can be stored under standard industrial conditions without special desiccant packaging requirements.

Q: Can these parts be used in both AC and DC circuits?

A: Yes. Both 015404.6DRTL and 015404.6DRT are rated for 125 V AC and 125 V DC operation, making them suitable for dual-voltage circuit protection applications.