Littelfuse 0230005.DRT3SW Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230005.DRT3SW is a 5 A, 125 V AC slow-blow glass cartridge fuse with axial through-hole mounting. This part is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing design and procurement requirements. The fuse is rated for 400 A breaking capacity at rated voltage and operates across a temperature range of -55°C to 125°C. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and functional characteristics to ensure direct compatibility in existing circuit designs.

Key Parameters

Parameter	Specification
Current Rating	5 A
Voltage Rating (AC)	125 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Mounting Type	Through Hole
Package / Case	Cartridge, Non-Standard (Axial)
Size / Dimension	0.177" Dia x 0.571" L (4.50mm x 14.50mm)
Breaking Capacity @ Rated Voltage	400 A
Melting I²t	267
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.0185 Ohms

Substitute Part Grouping Explanation

Substitute parts for the 0230005.DRT3SW are classified as parametric equivalents based on the following criteria:

Electrical Parameters (Critical for Substitution):

Current Rating: 5 A
Voltage Rating (AC): 125 V
Voltage Rating (DC): 125 V (substitute parts support dual voltage)
Response Time: Slow Blow
Breaking Capacity @ Rated Voltage: 400 A
Melting I²t: 267

Mechanical Parameters (Critical for Substitution):

Fuse Type: Cartridge, Glass
Mounting Type: Through Hole
Package / Case: Cartridge, Non-Standard (Axial)
Size / Dimension: 0.177" Dia x 0.571" L (4.50mm x 14.50mm)

Functional Parameters:

Operating Temperature Range: -55°C to 125°C
DC Cold Resistance: 0.0186 Ohms (substitute parts)

All substitute parts listed maintain these parameters, enabling direct functional replacement in circuit applications. The primary distinction between the main part and substitutes is product status (obsolete vs. active) and compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Breaking Capacity (A)	Melting I²t	Size (mm)	DC Resistance (Ohms)	Product Status	RoHS Status
0230005.DRT3SW	Littelfuse Inc.	5	125	—	Slow Blow	400	267	4.50 x 14.50	0.0185	Obsolete	RoHS Non-Compliant
0230005.DRT3SP	Littelfuse Inc.	5	125	125	Slow Blow	400	267	4.50 x 14.50	0.0186	Active	ROHS3 Compliant
0230005.DAT1OP	Littelfuse Inc.	5	125	125	Slow Blow	400	267	4.50 x 14.50	0.0186	Active	ROHS3 Compliant
0230005.DRT1P	Littelfuse Inc.	5	125	125	Slow Blow	400	267	4.50 x 14.50	0.0186	Active	ROHS3 Compliant
0230005.DRT1SP	Littelfuse Inc.	5	125	125	Slow Blow	400	267	4.50 x 14.50	0.0186	Active	ROHS3 Compliant
0230005.DRT2P	Littelfuse Inc.	5	125	125	Slow Blow	400	267	4.50 x 14.50	0.0186	Active	ROHS3 Compliant
0230005.DRT2SP	Littelfuse Inc.	5	125	125	Slow Blow	400	267	4.50 x 14.50	0.0186	Active	ROHS3 Compliant
0230005.DRT3P	Littelfuse Inc.	5	125	125	Slow Blow	400	267	4.50 x 14.50	0.0186	Active	ROHS3 Compliant
0230005.MRT1EP	Littelfuse Inc.	5	125	125	Slow Blow	400	267	4.50 x 14.50	0.0186	Active	ROHS3 Compliant
0230005.MRT1SSP	Littelfuse Inc.	5	125	125	Slow Blow	400	267	4.50 x 14.50	0.0186	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are direct parametric equivalents to the 0230005.DRT3SW. Selection among active alternatives should be based on the following factors:

Product Status: All substitute parts carry active product status, ensuring ongoing availability and manufacturer support. The original part is obsolete and should not be specified for new designs or long-term procurement.

Compliance & Certifications: Substitute parts are ROHS3 compliant, whereas the original part is RoHS non-compliant. For applications requiring RoHS compliance, any of the listed substitutes is appropriate. All substitute parts carry CE, CSA, PSE, and UL certifications, providing broader regulatory coverage than the original part's cUL and METI approvals.

Packaging Considerations: The original part is supplied in standard packaging. Substitute parts are available in Tape & Reel (TR) packaging, which is standard for high-volume procurement and automated assembly processes.

Electrical & Mechanical Equivalence: All substitute parts maintain identical electrical ratings (5 A, 125 V AC/DC, 400 A breaking capacity, 267 melting I²t) and mechanical dimensions (4.50mm x 14.50mm). DC cold resistance values are consistent at 0.0186 Ohms across all substitutes.

For new designs or redesigns, any of the active substitute parts is suitable. For existing inventory management or legacy system support, cross-reference the specific part number to confirm packaging and certification requirements.

Frequently Asked Questions (FAQ)

Q: Can any of the listed substitute parts directly replace the 0230005.DRT3SW?

A: Yes. All listed substitute parts are parametric equivalents with identical electrical ratings (5 A, 125 V AC/DC), response time (slow blow), breaking capacity (400 A), and mechanical dimensions (4.50mm x 14.50mm). Direct substitution is supported without circuit modification.

Q: What is the difference between the original part and the substitutes?

A: The primary differences are product status (obsolete vs. active), compliance certifications, and packaging format. Substitute parts are ROHS3 compliant and carry broader regulatory approvals (CE, CSA, PSE, UL). All substitute parts are supplied in Tape & Reel packaging for automated assembly.

Q: Are there voltage rating differences between the original and substitute parts?

A: The original part is rated for 125 V AC only. All substitute parts are rated for 125 V AC and 125 V DC, providing expanded application flexibility. This enhancement does not affect AC-only applications.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (standard vs. Tape & Reel) does not affect electrical or mechanical performance. The choice between packaging options is driven by procurement volume, assembly automation requirements, and inventory management practices.

Q: Which substitute part should be selected for new designs?

A: Any of the listed active substitute parts is suitable for new designs. Selection may be based on packaging preference, certification requirements, or supplier availability. All parts maintain identical electrical and mechanical specifications.

Q: Is the DC cold resistance difference between the original and substitutes significant?

A: The DC cold resistance of the original part is 0.0185 Ohms, while substitutes measure 0.0186 Ohms. This 0.0001 Ohm difference is negligible and does not affect circuit performance or fuse operation.

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