Littelfuse 0675.600MXEP Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0675.600MXEP is a 600 mA, 250 V AC/DC ceramic 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 to maintain design continuity and ensure supply chain availability for new production and field replacements.

Key Parameters

Parameter	Value
Current Rating	600 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Mounting Type	Through Hole
Package / Case	Cartridge, Non-Standard (Axial)
Breaking Capacity @ Rated Voltage	50 A
Approval Agency	CSA, UL
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0675.600MXEP are identified based on strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Current Rating: 600 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Breaking Capacity @ Rated Voltage: 50 A (exact match required)
Mounting Type: Through Hole (exact match required)

Substitute Parts Identified:

0875.600MXEP (Direct Manufacturer Substitute) - Active product status, cULus certification, improved operating temperature range (-55°C ~ 125°C), compact dimensions (3.60mm x 10.00mm), ROHS3 compliant.
0675.600MXE (Parametric Equivalent) - Active product status, CSA/UL certification, identical electrical parameters to main part, standard dimensions (3.90mm x 11.00mm), RoHS non-compliant.

Parameter Comparison

Parameter	0675.600MXEP (Main)	0875.600MXEP (Substitute)	0675.600MXE (Equivalent)
Current Rating (Amps)	600 mA	600 mA	600 mA
Voltage Rating - AC	250 V	250 V	250 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)
Breaking Capacity @ Rated Voltage	50 A	50 A	50 A
Melting I²t	0.469	0.611	0.469
DC Cold Resistance (Ohms)	0.1504	0.151	0.1504
Size / Dimension	0.154" Dia x 0.433" L (3.90mm x 11.00mm)	0.142" Dia x 0.394" L (3.60mm x 10.00mm)	0.154" Dia x 0.433" L (3.90mm x 11.00mm)
Approval Agency	CSA, UL	cULus	CSA, UL
Operating Temperature	Not specified	-55°C ~ 125°C	Not specified
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

0875.600MXEP is the preferred substitute for the obsolete 0675.600MXEP. This part maintains all critical electrical parameters (600 mA, 250 V, 50 A breaking capacity, slow-blow response) and is an active product with cULus certification. The compact form factor (3.60mm x 10.00mm) provides space optimization benefits, and the specified operating temperature range (-55°C ~ 125°C) extends thermal performance envelope. ROHS3 compliance aligns with modern environmental standards.

0675.600MXE serves as an alternative parametric equivalent with identical electrical characteristics and matching physical dimensions to the main part. This option maintains CSA/UL certification and active product status. However, RoHS non-compliance may present regulatory constraints for new designs or markets with environmental compliance requirements.

Selection between these substitutes depends on design constraints: dimensional compatibility within the PCB layout and regulatory compliance requirements for the target application.

Frequently Asked Questions (FAQ)

Q: Can 0875.600MXEP be used as a direct replacement for 0675.600MXEP in existing designs?

A: Yes, provided that the compact dimensions (3.60mm x 10.00mm versus 3.90mm x 11.00mm) are compatible with the PCB layout and mechanical mounting structure. All electrical parameters and breaking capacity are identical.

Q: What is the significance of the different Melting I²t values between 0875.600MXEP (0.611) and the main part (0.469)?

A: The Melting I²t parameter indicates the thermal energy required to melt the fuse element. The higher value for 0875.600MXEP reflects design differences in the ceramic cartridge construction while maintaining the same current rating and response time classification. Both parts meet the 600 mA slow-blow specification.

Q: Is 0675.600MXE suitable for new production designs?

A: 0675.600MXE is electrically and mechanically equivalent to the obsolete 0675.600MXEP and maintains active product status. However, RoHS non-compliance may restrict use in applications subject to environmental regulations. Verify compliance requirements for your target market before selection.

Q: What certifications apply to these substitute parts?

A: 0875.600MXEP carries cULus certification. 0675.600MXE carries CSA and UL certification. Both certifications validate safety performance for the specified voltage and current ratings.

Q: Are there dimensional constraints when selecting between these substitutes?

A: Yes. The 0875.600MXEP has a smaller footprint (3.60mm x 10.00mm) compared to both the main part and 0675.600MXE (3.90mm x 11.00mm). Verify PCB layout and mechanical mounting clearances before substitution to ensure physical compatibility.

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