Littelfuse 023001.5DRT2SW Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 023001.5DRT2SW is a 1.5 A 250 V AC glass cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in axial configuration. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and field replacement applications.

Key Parameters

Parameter	Value
Current Rating	1.5 A
Voltage Rating (AC)	250 V
Voltage Rating (DC)	Not specified
Response Time	Slow Blow
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)
Melting I²t	15
DC Cold Resistance	0.107 Ohms
Operating Temperature Range	-55°C ~ 125°C
Series	230
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 023001.5DRT2SW is determined by strict equivalence across the following electrical and mechanical parameters:

Current Rating: 1.5 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Slow Blow (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Through Hole (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)
Melting I²t: 15 (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
Series: 230 (exact match required)

All substitute parts listed below meet these criteria and are manufactured by Littelfuse Inc. with active product status, ensuring availability and ongoing manufacturer support.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC	Voltage DC	Response Time	Fuse Type	Mounting	Package	Size	Melting I²t	DC Resistance	Temp Range	Product Status	RoHS Status	Inventory
023001.5DRT2SW	Littelfuse Inc.	1.5 A	250 V	Not specified	Slow Blow	Cartridge, Glass	Through Hole	Cartridge, Non-Standard (Axial)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	15	0.107 Ohms	-55°C ~ 125°C	Obsolete	RoHS non-compliant	630 Pcs
023001.5DRT2SP	Littelfuse Inc.	1.5 A	250 V	125 V	Slow Blow	Cartridge, Glass	Through Hole	Cartridge, Non-Standard (Axial)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	15	0.1077 Ohms	-55°C ~ 125°C	Active	ROHS3 Compliant	1128 Pcs
023001.5DRT1P	Littelfuse Inc.	1.5 A	250 V	125 V	Slow Blow	Cartridge, Glass	Through Hole	Cartridge, Non-Standard (Axial)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	15	0.1077 Ohms	-55°C ~ 125°C	Active	ROHS3 Compliant	737 Pcs
023001.5DRT1SP	Littelfuse Inc.	1.5 A	250 V	125 V	Slow Blow	Cartridge, Glass	Through Hole	Cartridge, Non-Standard (Axial)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	15	0.1077 Ohms	-55°C ~ 125°C	Active	ROHS3 Compliant	958 Pcs
023001.5DRT2P	Littelfuse Inc.	1.5 A	250 V	125 V	Slow Blow	Cartridge, Glass	Through Hole	Cartridge, Non-Standard (Axial)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	15	0.1077 Ohms	-55°C ~ 125°C	Active	ROHS3 Compliant	879 Pcs
023001.5DRT3P	Littelfuse	1.5 A	250 V	125 V	Slow Blow	Cartridge, Glass	Through Hole	Cartridge, Non-Standard (Axial)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	15	0.1077 Ohms	-55°C ~ 125°C	Active	ROHS3 Compliant	894 Pcs
023001.5DRT3SP	Littelfuse Inc.	1.5 A	250 V	125 V	Slow Blow	Cartridge, Glass	Through Hole	Cartridge, Non-Standard (Axial)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	15	0.1077 Ohms	-55°C ~ 125°C	Active	ROHS3 Compliant	896 Pcs
023001.5MRT1EP	Littelfuse Inc.	1.5 A	250 V	125 V	Slow Blow	Cartridge, Glass	Through Hole	Cartridge, Non-Standard (Axial)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	15	0.1077 Ohms	-55°C ~ 125°C	Active	ROHS3 Compliant	1450 Pcs
023001.5MRT1SSP	Littelfuse Inc.	1.5 A	250 V	125 V	Slow Blow	Cartridge, Glass	Through Hole	Cartridge, Non-Standard (Axial)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	15	0.1077 Ohms	-55°C ~ 125°C	Active	ROHS3 Compliant	723 Pcs

Engineering Selection Recommendations

All listed substitute parts are manufactured by Littelfuse Inc. and carry active product status, ensuring continued availability and manufacturer technical support. The substitute parts provide enhanced regulatory compliance through ROHS3 certification compared to the obsolete 023001.5DRT2SW, which is RoHS non-compliant.

The substitute parts include DC voltage rating specification (125 V DC) not present in the original part specification. This additional rating parameter does not restrict substitution in AC-only applications and provides expanded operational capability for designs requiring DC circuit protection.

All substitute parts maintain identical electrical characteristics (1.5 A current rating, 250 V AC voltage rating, slow-blow response, melting I²t of 15) and mechanical dimensions (0.177" Dia x 0.571" L), ensuring direct functional equivalence in existing circuit designs and PCB layouts.

Inventory availability ranges from 723 to 1450 pieces across the substitute part options, supporting both prototype and production-volume requirements.

Frequently Asked Questions (FAQ)

Q: Can any of these substitute parts directly replace the 023001.5DRT2SW in existing designs?

A: Yes. All listed substitute parts maintain identical current rating (1.5 A), AC voltage rating (250 V), response time (slow-blow), fuse type (cartridge glass), mounting type (through-hole), package configuration (non-standard axial), physical dimensions (0.177" Dia x 0.571" L), melting I²t (15), and operating temperature range (-55°C ~ 125°C). Direct substitution is electrically and mechanically compatible.

Q: What is the difference between the substitute parts?

A: All substitute parts are electrically and mechanically equivalent. Differences exist only in packaging format (Tape & Reel for all substitutes versus unspecified for the original) and internal manufacturing variants indicated by part number suffixes (DRT1P, DRT1SP, DRT2P, DRT2SP, DRT3P, DRT3SP, MRT1EP, MRT1SSP). These variants do not affect electrical performance or physical compatibility.

Q: Why do the substitute parts specify 125 V DC rating while the original does not?

A: The original 023001.5DRT2SW specification does not include DC voltage rating information. The substitute parts explicitly specify 125 V DC rating, providing additional operational data. This specification does not restrict use in AC-only applications and indicates expanded capability for dual AC/DC circuit protection scenarios.

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

A: Yes. The original 023001.5DRT2SW is RoHS non-compliant. All substitute parts are ROHS3 compliant, meeting current environmental and hazardous substance restriction requirements. Both the original and substitutes carry CE, CSA, and UL certifications, with substitutes additionally holding PSE certification.

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

A: Selection among substitute parts should be based on packaging requirements (all are Tape & Reel format) and inventory availability. From an engineering perspective, all substitute parts are functionally equivalent. The 023001.5MRT1EP offers the highest inventory level (1450 pieces), supporting production continuity.

Q: Is the DC cold resistance difference (0.107 Ohms vs. 0.1077 Ohms) significant?

A: No. The resistance values are equivalent within normal manufacturing tolerance. Both values represent the same electrical characteristic and do not affect circuit performance or fuse operation.

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