Littelfuse 0230.750DRT3SW Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230.750DRT3SW is a 750 mA, 250 V AC glass cartridge fuse with slow-blow response characteristics, designed for through-hole axial mounting. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility. Substitute parts must match the core electrical ratings, physical dimensions, and thermal characteristics to ensure proper circuit protection without redesign.

Key Parameters

Parameter	Value
Current Rating	750 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	Cartridge, Non-Standard (Axial)
Physical Dimensions	0.177" Dia x 0.571" L (4.50mm x 14.50mm)
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	35A
Melting I²t	2.95
DC Cold Resistance	0.34 Ohms
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Current Rating: 750 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Physical Dimensions: 0.177" Dia x 0.571" L / 4.50mm x 14.50mm (exact match required)
Mounting Type: Through Hole, Axial (exact match required)
Melting I²t: 2.95 (exact match required)

All identified substitute parts meet these core electrical and mechanical criteria. Differences in packaging format (Tape & Reel vs. Cut Tape) and DC voltage rating do not affect functional substitution in AC-primary applications. Parts with DC voltage ratings (125 V DC) provide enhanced capability without compromising AC circuit protection.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC	Voltage DC	Response Time	Breaking Capacity	Melting I²t	DC Resistance	Product Status	Packaging	RoHS Status
0230.750DRT3SW	Littelfuse Inc.	750 mA	250 V	—	Slow Blow	35A	2.95	0.34 Ω	Obsolete	—	RoHS Non-Compliant
0230.750DRT3SP	Littelfuse Inc.	750 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	2.95	0.343 Ω	Active	Tape & Reel	ROHS3 Compliant
0230.750DAT1P	Littelfuse Inc.	750 mA	250 V	—	Slow Blow	35A	2.95	0.343 Ω	Active	Tape & Reel	ROHS3 Compliant
0230.750DRT1P	Littelfuse Inc.	750 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	2.95	0.343 Ω	Active	Cut Tape	ROHS3 Compliant
0230.750DRT1SP	Littelfuse Inc.	750 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	2.95	0.343 Ω	Active	Tape & Reel	ROHS3 Compliant
0230.750DRT2P	Littelfuse Inc.	750 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	2.95	0.343 Ω	Active	Tape & Reel	ROHS3 Compliant
0230.750DRT2SP	Littelfuse Inc.	750 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	2.95	0.343 Ω	Active	Tape & Reel	ROHS3 Compliant
0230.750DRT3P	Littelfuse Inc.	750 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	2.95	0.343 Ω	Active	Tape & Reel	ROHS3 Compliant
0230.750MRT1SSP	Littelfuse Inc.	750 mA	250 V	125 V	Slow Blow	35A AC, 10kA DC	2.95	0.343 Ω	Active	Tape & Reel	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed are manufactured by Littelfuse Inc. and maintain identical electrical and mechanical specifications to the obsolete 0230.750DRT3SW. Selection should prioritize active product status and regulatory compliance:

Primary Recommendation: 0230.750DRT3SP, 0230.750DAT1P, or 0230.750DRT1P. These parts are active, ROHS3 compliant, and carry CE, CSA, and UL certifications. The 0230.750DRT3SP provides direct functional equivalence with enhanced DC voltage capability (125 V DC) and improved breaking capacity specification (10kA DC).

Secondary Options: 0230.750DRT1SP, 0230.750DRT2P, 0230.750DRT2SP, 0230.750DRT3P, and 0230.750MRT1SSP are functionally equivalent alternatives with identical electrical performance and active product status. Selection among these variants depends on packaging requirements (Tape & Reel vs. Cut Tape) and procurement volume specifications.

All substitute parts operate across the same temperature range (-55°C ~ 125°C) and maintain equivalent thermal response characteristics (Melting I²t = 2.95).

Frequently Asked Questions (FAQ)

Q: Can 0230.750DRT3SP directly replace 0230.750DRT3SW?

A: Yes. Both parts share identical current rating (750 mA), AC voltage rating (250 V), fuse type (cartridge, glass), response time (slow blow), physical dimensions (4.50mm x 14.50mm), and melting I²t (2.95). The 0230.750DRT3SP is active and ROHS3 compliant, making it the direct functional equivalent.

Q: What is the difference between parts with and without DC voltage ratings?

A: Parts specifying 125 V DC (such as 0230.750DRT3SP) provide dual-voltage capability and enhanced breaking capacity specification (10kA DC vs. 35A AC only). In AC-only applications, parts without DC ratings (0230.750DAT1P) are functionally equivalent. DC voltage rating does not affect AC circuit protection performance.

Q: Does packaging format (Tape & Reel vs. Cut Tape) affect electrical performance?

A: No. Packaging format affects only procurement and assembly logistics. Electrical and mechanical specifications remain identical. 0230.750DRT1P (Cut Tape) and 0230.750DRT1SP (Tape & Reel) are electrically interchangeable.

Q: Why is the original part obsolete?

A: Product obsolescence reflects manufacturing discontinuation. Active equivalents with identical specifications and improved regulatory compliance (ROHS3) are available from the same manufacturer.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are ROHS3 compliant. The original 0230.750DRT3SW is RoHS non-compliant. Substitution to any listed part improves regulatory compliance for new designs and procurement.

Q: What certifications do substitute parts carry?

A: All substitute parts carry CE, CSA, and UL certifications, meeting international safety and performance standards. The original part carried CSA and UL certifications only.

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