Littelfuse 0154005.DRT Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0154005.DRT is a 5 A, 125 V AC/DC surface mount board mount fuse in the OMNI-BLOK® 154T series. This slow blow fuse is designed for applications requiring overcurrent protection in compact form factors with holder-based mounting. The part is active and widely stocked, with 16,735 units available. Substitute parts may be required due to packaging format availability, holder design differences, or series-specific design requirements in target applications.

Key Parameters

Parameter	Value
Current Rating	5 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Slow Blow
Mounting Type	Requires Holder, Surface Mount
Fuse Type	Board Mount (Cartridge Style Excluded)
Breaking Capacity @ Rated Voltage	50 A
Melting I²t	53.72
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.0136 Ohms
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 0154005.DRT is determined by the following critical parameters:

Current Rating: 5 A (exact match required)
Voltage Rating: 125 V AC and 125 V DC (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Surface Mount with Holder requirement (exact match required)
Breaking Capacity: 50 A @ Rated Voltage (exact match required)
Melting I²t: 53.72 (exact match required)
Operating Temperature: -55°C to 125°C (exact match required)
RoHS Compliance: ROHS3 Compliant (exact match required)

Substitute parts may differ in packaging format (Cut Tape vs. Tape & Reel), holder design (Holder vs. Clip), series designation, and physical dimensions, provided all electrical and thermal characteristics remain identical.

Parameter Comparison

Parameter	0154005.DRT (Main)	0157005.DRT (Substitute)	0154005.DRTL (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	5 A	5 A	5 A
Voltage Rating - AC	125 V	125 V	125 V
Voltage Rating - DC	125 V	125 V	125 V
Response Time	Slow Blow	Slow Blow	Slow Blow
Mounting Type	Requires Holder, Surface Mount	Requires Holder, Surface Mount	Requires Holder, Surface Mount
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)
Breaking Capacity @ Rated Voltage	50 A	50 A	50 A
Melting I²t	53.72	53.72	53.72
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
DC Cold Resistance	0.0136 Ohms	0.0138 Ohms	0.0136 Ohms
Series	OMNI-BLOK® 154T	NANO²® 157T	OMNI-BLOK® 154TL
Package / Case	2-SMD, Square End Block with Holder	2-SMD, Square End Block with Clip	2-SMD, Square End Block with Holder
Packaging Format	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)
Size / Dimension	0.383" L x 0.198" W x 0.150" H (9.73mm x 5.03mm x 3.81mm)	0.256" L x 0.146" W x 0.154" H (6.50mm x 3.70mm x 3.90mm)	0.383" L x 0.198" W x 0.150" H (9.73mm x 5.03mm x 3.81mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	PSE, UL	cULus, PSE	PSE, UL
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts maintain identical electrical and thermal performance characteristics. Selection between them is determined by application-specific requirements:

0154005.DRT (Main Part): Specified for applications requiring Cut Tape or Digi-Reel® packaging with OMNI-BLOK® 154T series holder compatibility. UL and PSE certifications apply.

0157005.DRT (MFR Recommended Substitute): Specified for applications requiring Tape & Reel packaging with NANO²® 157T series clip-based holder design. Smaller physical dimensions (6.50mm x 3.70mm x 3.90mm) suit space-constrained layouts. cULus and PSE certifications apply. DC cold resistance is 0.0138 Ohms versus 0.0136 Ohms for the main part.

0154005.DRTL (Parametric Equivalent Substitute): Specified for applications requiring Tape & Reel packaging while maintaining OMNI-BLOK® 154TL series holder compatibility and identical physical dimensions to the main part. UL and PSE certifications apply. Identical DC cold resistance of 0.0136 Ohms.

Frequently Asked Questions (FAQ)

Q: Can 0157005.DRT be used as a direct replacement for 0154005.DRT?

A: Electrical and thermal performance are identical. Physical dimensions differ (0157005.DRT is smaller). Holder compatibility must be verified for the target application, as 0157005.DRT uses a clip-based design versus the holder-based design of 0154005.DRT.

Q: What is the difference between the holder and clip designs?

A: The main part and 0154005.DRTL use a Square End Block with Holder design. The 0157005.DRT uses a Square End Block with Clip design. These are mechanically distinct mounting interfaces and require compatible PCB footprints and holder hardware.

Q: Are all three parts RoHS compliant?

A: Yes, all three parts are ROHS3 Compliant.

Q: What packaging formats are available?

A: 0154005.DRT is available in Cut Tape (CT) and Digi-Reel® formats. Both 0157005.DRT and 0154005.DRTL are available in Tape & Reel (TR) format.

Q: Do all parts have the same approval certifications?

A: 0154005.DRT and 0154005.DRTL carry PSE and UL certifications. 0157005.DRT carries cULus and PSE certifications. Application requirements may specify which certifications are necessary.

Q: Is there a difference in DC cold resistance between the parts?

A: 0154005.DRT and 0154005.DRTL both measure 0.0136 Ohms. 0157005.DRT measures 0.0138 Ohms. This difference is negligible for typical circuit applications.

Q: Can these parts be used interchangeably in the same PCB design?

A: Electrical substitution is valid only if the PCB footprint and holder hardware are compatible with the selected part's mechanical design. Physical dimensions and holder type must be verified against the target application's design specifications.

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