Littelfuse 0154004.DR Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0154004.DR is a 4A 125VAC/VDC surface mount board fuse in the OMNI-BLOK® 154 series, designed for fast-blow protection in electronic circuits requiring holder-based mounting. This component is actively manufactured and stocked. Substitute parts may be required due to packaging format preferences, inventory availability, or specific mechanical mounting constraints in board design.

Substiute Parts

0154004.DR

Littelfuse Inc.In Stock: 72460154004.DR Datasheet

Current PartRFQ

0157004.DR

Littelfuse Inc.In Stock: 13360157004.DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0157004.DR qualifies as a direct substitute based on the following critical electrical and mechanical parameters:

• Current Rating: Both parts rated at 4 A
• Voltage Ratings: Both rated 125 V AC and 125 V DC
• Response Time: Both Fast Blow
• Breaking Capacity: Both 50 A @ rated voltage
• Melting I²t: Both 3.152
• Operating Temperature: Both -55°C to 125°C
• DC Cold Resistance: 0.0163 Ohms (0157004.DR) vs 0.016 Ohms (0154004.DR) — within acceptable tolerance
• Compliance: Both ROHS3 compliant and REACH unaffected

The primary difference is packaging format: 0154004.DR uses Cut Tape (CT) & Digi-Reel® packaging with a Square End Block with Holder, while 0157004.DR uses Tape & Reel (TR) packaging with a Square End Block with Clip. The 0157004.DR also features a smaller physical footprint (6.50mm x 3.70mm x 3.90mm vs 9.73mm x 5.03mm x 3.81mm).

Parameter Comparison

Engineering Selection Recommendations

Both parts are active products from Littelfuse Inc. with equivalent electrical performance. Selection between 0154004.DR and 0157004.DR should be based on:

• Packaging Requirements: Choose 0154004.DR for Cut Tape & Digi-Reel® format; select 0157004.DR for Tape & Reel format
• Board Space Constraints: The 0157004.DR (NANO²® 157 series) occupies a smaller footprint and is suitable for space-constrained applications
• Holder Compatibility: Verify that the board holder accommodates either the Square End Block with Holder (0154004.DR) or Square End Block with Clip (0157004.DR)
• Certification Requirements: Both parts meet PSE approval; 0154004.DR includes UL certification while 0157004.DR includes cULus certification

Frequently Asked Questions (FAQ)

Q: Can 0157004.DR replace 0154004.DR in existing designs? A: Yes, provided the board holder is compatible with the Square End Block with Clip configuration. Electrical performance is identical.

Q: What is the difference between the holder types? A: 0154004.DR uses a Square End Block with Holder design, while 0157004.DR uses a Square End Block with Clip design. These are mechanical mounting variations; verify your board design supports the substitute holder type.

Q: Are there any resistance differences between these parts? A: DC Cold Resistance is 0.016 Ohms (0154004.DR) versus 0.0163 Ohms (0157004.DR). This 0.3% difference is negligible for circuit protection applications.

Q: Which part should I use for new designs? A: Both are active products. Choose based on packaging availability, board space requirements, and holder compatibility. The 0157004.DR offers a smaller footprint if space is a consideration.

Q: Are both parts RoHS compliant? A: Yes, both 0154004.DR and 0157004.DR are ROHS3 compliant and REACH unaffected.