Littelfuse 015402.5DRTL Surface Mount Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 015402.5DRTL is a 2.5 A, 125 V AC/DC surface mount board mount fuse in the OMNI-BLOK® 154TL series. This component is designed for circuit protection in applications requiring slow blow response characteristics and is currently in active production status. Identifying equivalent substitute parts ensures design flexibility, supply chain continuity, and component availability across manufacturing cycles.

Substiute Parts

015402.5DRTL

Littelfuse Inc.In Stock: 966015402.5DRTL Datasheet

Current PartRFQ

015402.5DRT

Littelfuse Inc.In Stock: 2452015402.5DRT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 015402.5DRTL are determined by strict equivalence across the following critical parameters:

• Current Rating: 2.5 A
• Voltage Rating: 125 V AC / 125 V DC
• Response Time: Slow Blow
• Fuse Type: Board Mount (Cartridge Style Excluded)
• Mounting Type: Requires Holder, Surface Mount
• Package / Case: 2-SMD, Square End Block with Holder
• Breaking Capacity @ Rated Voltage: 50 A
• Melting I²t: 15
• Operating Temperature Range: -55°C ~ 125°C
• DC Cold Resistance: 0.045 Ohms
• Approval Agency: PSE, UL

The substitute part 015402.5DRT shares all critical electrical and mechanical parameters with the main part, differing only in series designation (OMNI-BLOK® 154T versus 154TL) and inventory availability. Both parts are manufactured by Littelfuse Inc. and maintain identical functional specifications for circuit protection applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 015402.5DRTL and 015402.5DRT are active production components manufactured by Littelfuse Inc. with identical electrical and mechanical specifications. Selection between these parts should be based on:

• Inventory availability and lead time requirements
• Series compatibility with existing design documentation (154TL versus 154T)
• Supply chain sourcing preferences
• PCB assembly scheduling constraints

Both parts carry PSE and UL approvals and maintain ROHS3 compliance, ensuring regulatory conformance for circuit protection applications operating within the specified voltage and current parameters.

Frequently Asked Questions (FAQ)

Q: Can the 015402.5DRT be used as a direct replacement for the 015402.5DRTL?

A: Yes. Both parts share identical electrical ratings (2.5 A, 125 V AC/DC), response characteristics (Slow Blow), mechanical dimensions (0.383" L x 0.198" W x 0.150" H), and approval certifications (PSE, UL). The primary difference is the series designation within the OMNI-BLOK® product line.

Q: What are the critical parameters that define substitutability for this fuse?

A: Substitutability is determined by matching current rating (2.5 A), voltage rating (125 V AC/DC), response time (Slow Blow), fuse type (Board Mount), mounting configuration (Requires Holder, Surface Mount), package format (2-SMD, Square End Block with Holder), breaking capacity (50 A), and thermal characteristics (Operating Temperature -55°C ~ 125°C).

Q: Are there any package or holder compatibility concerns?

A: Both parts use identical 2-SMD, Square End Block with Holder packaging. No holder modifications or PCB layout changes are required when substituting between these parts.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both the 015402.5DRTL and 015402.5DRT carry PSE and UL approvals and are ROHS3 compliant, meeting the same regulatory requirements for circuit protection applications.

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

A: The series designation reflects internal Littelfuse product line categorization. Both series maintain identical functional specifications for the 2.5 A, 125 V slow blow fuse in this package configuration.