Littelfuse 02302.25DRT1SW Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 02302.25DRT1SW is a 2.25 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. Substitute parts must preserve the 2.25 A current rating, 250 V AC voltage specification, slow-blow response time, and identical physical dimensions (4.50mm × 14.50mm) to ensure direct functional replacement in existing circuit designs.

Key Parameters

Parameter	Value
Manufacturer	Littelfuse Inc.
Series	230
Current Rating	2.25 A
Voltage Rating - AC	250 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
Package / Case	Cartridge, Non-Standard (Axial)
Size / Dimension	0.177" Dia × 0.571" L (4.50mm × 14.50mm)
Mounting Type	Through Hole
Operating Temperature Range	-55°C to 125°C
Melting I²t	39
DC Cold Resistance	0.0562 Ohms
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 02302.25DRT1SW is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Current Rating: 2.25 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)
Physical Dimensions: 0.177" Dia × 0.571" L / 4.50mm × 14.50mm (exact match required)
Mounting Type: Through Hole, Axial (exact match required)
Series: 230 (exact match required)

Acceptable Variations:

Voltage Rating - DC: The main part specifies AC only; substitute parts with additional DC rating (125 V DC) are acceptable as they provide extended operational capability without compromising AC performance.
Packaging Format: Transition from bulk to Tape & Reel (TR) packaging is acceptable for supply chain modernization.
Product Status: Active status substitutes are preferred over obsolete status for long-term availability.
RoHS Compliance: Upgrade from non-compliant to ROHS3 compliant status is acceptable.
Approval Agencies: Substitute parts with expanded certifications (CE, PSE added to existing CSA, UL) are acceptable.

All identified substitute parts maintain identical electrical performance characteristics (Melting I²t: 39, DC Cold Resistance: 0.0567 Ohms) and thermal operating range (-55°C to 125°C).

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Fuse Type	Dimensions (mm)	Product Status	RoHS Status	Packaging	Inventory (Pcs)
02302.25DRT1SW	Littelfuse Inc.	2.25	250	—	Slow Blow	Cartridge, Glass	4.50 × 14.50	Obsolete	Non-compliant	Bulk	693
02302.25DRT1SP	Littelfuse Inc.	2.25	250	125	Slow Blow	Cartridge, Glass	4.50 × 14.50	Active	ROHS3 Compliant	Tape & Reel	764
02302.25DRT1P	Littelfuse Inc.	2.25	250	125	Slow Blow	Cartridge, Glass	4.50 × 14.50	Active	ROHS3 Compliant	Tape & Reel	740
02302.25DRT2P	Littelfuse Inc.	2.25	250	125	Slow Blow	Cartridge, Glass	4.50 × 14.50	Active	ROHS3 Compliant	Tape & Reel	667
02302.25DRT2SP	Littelfuse Inc.	2.25	250	125	Slow Blow	Cartridge, Glass	4.50 × 14.50	Active	ROHS3 Compliant	Tape & Reel	672
02302.25DRT3P	Littelfuse Inc.	2.25	250	125	Slow Blow	Cartridge, Glass	4.50 × 14.50	Active	ROHS3 Compliant	Tape & Reel	932
02302.25MRT1SSP	Littelfuse Inc.	2.25	250	125	Slow Blow	Cartridge, Glass	4.50 × 14.50	Active	ROHS3 Compliant	Tape & Reel	992

Engineering Selection Recommendations

All identified substitute parts (02302.25DRT1SP, 02302.25DRT1P, 02302.25DRT2P, 02302.25DRT2SP, 02302.25DRT3P, 02302.25MRT1SSP) are classified as active products and provide direct functional replacement for the obsolete 02302.25DRT1SW. Selection among these equivalents should be based on the following criteria:

Product Status & Availability: All substitute parts maintain active status, ensuring continued manufacturing support and supply chain availability. The 02302.25MRT1SSP variant offers the highest current inventory level (992 pcs), followed by 02302.25DRT3P (932 pcs).

Compliance & Certifications: All substitute parts are ROHS3 compliant and carry expanded approval agency certifications (CE, CSA, PSE, UL) compared to the main part's limited certifications (CSA, METI, UL). This expanded certification scope supports broader regulatory requirements across international markets.

Voltage Capability: All substitute parts include 125 V DC rating in addition to the 250 V AC specification. This extended voltage capability does not compromise AC performance and provides operational flexibility for mixed AC/DC circuit applications.

Packaging Transition: Migration from bulk packaging to Tape & Reel (TR) format aligns with modern manufacturing and assembly processes, improving handling efficiency and component traceability.

Frequently Asked Questions (FAQ)

Q: Can any of the substitute parts directly replace the 02302.25DRT1SW in existing designs?

A: Yes. All identified substitute parts maintain identical current rating (2.25 A), AC voltage rating (250 V), response time (slow blow), fuse type (cartridge glass), physical dimensions (4.50mm × 14.50mm), and mounting configuration (through-hole axial). Direct substitution is electrically and mechanically compatible.

Q: What is the significance of the DC voltage rating (125 V) on substitute parts?

A: The main part specifies AC operation only. Substitute parts with 125 V DC rating provide extended operational capability for circuits requiring both AC and DC voltage exposure. This additional rating does not affect AC performance and represents a functional enhancement.

Q: Does the transition from bulk to Tape & Reel packaging affect component performance?

A: No. Packaging format change (bulk to Tape & Reel) is a supply chain and manufacturing consideration only. Electrical and mechanical performance characteristics remain identical. Tape & Reel packaging improves automated assembly compatibility and component traceability.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts are ROHS3 compliant. The main part is RoHS non-compliant. This compliance upgrade supports environmental regulations and may be required for certain end-market applications.

Q: What approval agencies certify the substitute parts?

A: All substitute parts carry CE, CSA, PSE, and UL certifications. The main part carries CSA, METI, and UL certifications. The expanded certification scope of substitute parts supports broader international regulatory requirements.

Q: Are there performance differences in melting I²t or DC cold resistance between the main part and substitutes?

A: The melting I²t value is identical (39) across all parts. DC cold resistance shows negligible variation (0.0562 Ohms main part vs. 0.0567 Ohms substitutes), representing less than 0.1% difference and having no practical impact on circuit performance.

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

A: For new designs, any active substitute part is appropriate. Selection may be based on inventory availability, packaging preference, or supply chain logistics. The 02302.25MRT1SSP offers the highest inventory level for immediate availability.

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