Littelfuse 023002.5DRT3SW Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 023002.5DRT3SW is a 2.5 A 250 V AC DC glass cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in axial configuration. This part is classified as obsolete, which necessitates identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and field replacement applications.

Key Parameters

Parameter	Value
Manufacturer	Littelfuse Inc.
Series	230
Current Rating	2.5 A
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	Cartridge, Non-Standard (Axial)
Mounting Type	Through Hole
Size / Dimension	0.177" Dia x 0.571" L (4.50mm x 14.50mm)
Operating Temperature Range	-55°C ~ 125°C
Melting I²t	50
DC Cold Resistance	0.0498 Ohms

Substitute Part Grouping Explanation

Substitution of the obsolete 023002.5DRT3SW is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

Current Rating: 2.5 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Response Time: Slow Blow (exact match required)
Melting I²t: 50 (exact match required)

Mechanical Parameters:

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

Compliance Parameters:

Series: 230 (exact match required)
Manufacturer: Littelfuse Inc. (same manufacturer preferred)

All substitute parts listed below meet these criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Part Number	Product Status	Current Rating	Voltage Rating - AC	Voltage Rating - DC	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance	RoHS Status	Approval Agency	Inventory (Pcs)
023002.5DRT3SW	Obsolete	2.5 A	250 V	Not specified	Slow Blow	100 A	50	0.0498 Ohms	RoHS non-compliant	CSA, METI, UL	1138
023002.5DRT3SP	Active	2.5 A	250 V	125 V	Slow Blow	35 A AC, 10 kA DC	50	0.0502 Ohms	ROHS3 Compliant	CE, CSA, PSE, UL	955
023002.5DRT1P	Active	2.5 A	250 V	125 V	Slow Blow	35 A AC, 10 kA DC	50	0.0502 Ohms	ROHS3 Compliant	CE, CSA, PSE, UL	935
023002.5DRT1SP	Active	2.5 A	250 V	125 V	Slow Blow	35 A AC, 10 kA DC	50	0.0502 Ohms	ROHS3 Compliant	CE, CSA, PSE, UL	1035
023002.5DRT2P	Active	2.5 A	250 V	125 V	Slow Blow	35 A AC, 10 kA DC	50	0.0502 Ohms	ROHS3 Compliant	CE, CSA, PSE, UL	748
023002.5DRT2SP	Active	2.5 A	250 V	125 V	Slow Blow	35 A AC, 10 kA DC	50	0.0502 Ohms	ROHS3 Compliant	CE, CSA, PSE, UL	771
023002.5DRT3P	Active	2.5 A	250 V	125 V	Slow Blow	35 A AC, 10 kA DC	50	0.0502 Ohms	ROHS3 Compliant	CE, CSA, PSE, UL	754
023002.5MRT1SSP	Active	2.5 A	250 V	125 V	Slow Blow	35 A AC, 10 kA DC	50	0.0502 Ohms	ROHS3 Compliant	CE, CSA, PSE, UL	876

Engineering Selection Recommendations

All listed substitute parts are direct parametric equivalents to the 023002.5DRT3SW and maintain identical electrical and mechanical specifications. The primary distinction between the obsolete part and active substitutes is regulatory compliance status.

The 023002.5DRT3SW carries RoHS non-compliant status with approval from CSA, METI, and UL. All active substitute parts are ROHS3 compliant and carry expanded approval certifications including CE, CSA, PSE, and UL, providing broader regulatory acceptance across international markets.

The DC voltage rating specification (125 V DC) is present in all active substitutes but not explicitly stated in the obsolete part documentation. This addition does not restrict AC-only applications and extends the functional scope of the replacement parts.

Packaging differences exist between substitute options: parts designated with "SP" suffix are supplied in Tape & Reel packaging, while "P" suffix parts are also supplied in Tape & Reel. All maintain identical through-hole axial cartridge form factor and dimensional specifications.

Frequently Asked Questions (FAQ)

Q: Can any of the listed substitute parts directly replace the 023002.5DRT3SW in existing designs?

A: Yes. All substitute parts maintain identical current rating (2.5 A), AC voltage rating (250 V), response time (slow blow), melting I²t (50), physical dimensions (0.177" Dia x 0.571" L), and mounting configuration (through-hole axial cartridge). Electrical and mechanical compatibility is complete.

Q: What is the difference between parts with "P" and "SP" suffixes?

A: The suffix designates packaging configuration. Both are supplied in Tape & Reel format. The functional electrical and mechanical specifications are identical between these variants.

Q: Why do the active substitute parts specify 125 V DC rating when the obsolete part does not?

A: The DC voltage rating is an additional specification parameter in the active parts that extends their functional application range. This specification does not affect AC-only applications and does not restrict use in circuits designed for the original part.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts are ROHS3 compliant. The obsolete 023002.5DRT3SW is RoHS non-compliant. For new designs and production requiring RoHS compliance, any of the listed active substitutes are appropriate selections.

Q: What certifications do the substitute parts carry?

A: All active substitute parts carry CE, CSA, PSE, and UL approvals. The obsolete part carries CSA, METI, and UL approvals. The expanded certification set of the active parts provides broader regulatory acceptance.

Q: Are there inventory differences between substitute options?

A: Yes. Inventory levels vary across the substitute part numbers, ranging from 748 to 1035 pieces in current stock. Selection based on availability may be necessary for high-volume requirements.

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