Littelfuse 027504.6M Equivalent & Substitute Parts

Part Overview

The Littelfuse 027504.6M is a 4.6 A, 125 V AC/DC board mount axial fuse in the PICO® 275 series. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations. The part operates across a temperature range of -55°C to 125°C and is designed for through-hole mounting applications requiring fast-blow response characteristics.

Substiute Parts

027503.5M

Littelfuse Inc.In Stock: 1101027503.5M Datasheet

Current PartRFQ

025103.5MXL

Littelfuse Inc.In Stock: 1171025103.5MXL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 027504.6M is determined by strict equivalence across the following critical parameters:

• Current Rating: 4.6 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Fuse Type: Board Mount, Axial configuration (exact match required)
• Mounting Type: Through Hole (exact match required)
• Response Time: Fast Blow (exact match required)
• Operating Temperature Range: -55°C to 125°C (minimum requirement)

The substitute part 025104.6MXL meets all these criteria while offering improved product status (Active) and enhanced compliance certifications. Physical dimensions differ slightly (0.110" Dia vs. 0.093" Dia), but both maintain the same 0.280" length and axial package configuration suitable for board mount through-hole applications.

Parameter Comparison

Engineering Selection Recommendations

The 025104.6MXL is the direct functional equivalent for the obsolete 027504.6M. Selection of this substitute is supported by:

• Identical electrical specifications (4.6 A, 125 V AC/DC, Fast Blow response)
• Identical mounting and package configuration (Through Hole, Axial)
• Active product status ensuring continued availability and supply chain stability
• Enhanced regulatory compliance with ROHS3 certification and expanded approval agencies (CSA, cURus, PSE, TUV versus UL only)
• Improved electrical performance characteristics including specified breaking capacity (50A AC, 300A DC) and DC cold resistance (0.024 Ohms)

The minor dimensional increase in diameter (0.110" versus 0.093") does not affect functional compatibility in standard through-hole board mount applications. Physical board layout verification is recommended for space-constrained designs.

Frequently Asked Questions (FAQ)

Q: Can the 025104.6MXL be used as a direct replacement for the 027504.6M?

A: Yes. Both parts share identical current rating (4.6 A), voltage ratings (125 V AC/DC), response time (Fast Blow), mounting type (Through Hole), and package configuration (Axial). The substitute is functionally equivalent for all electrical and mechanical requirements.

Q: What is the primary reason for substitution?

A: The 027504.6M is classified as obsolete. The 025104.6MXL is an active product from the same manufacturer, ensuring long-term availability and supply chain continuity.

Q: Are there dimensional compatibility concerns?

A: The substitute has a slightly larger diameter (0.110" versus 0.093"), while maintaining the same 0.280" length. Both are axial through-hole components. Board layout verification is recommended for designs with tight spatial constraints, though standard through-hole footprints accommodate both dimensions.

Q: What compliance improvements does the substitute offer?

A: The 025104.6MXL is ROHS3 compliant, whereas the original part is RoHS non-compliant. The substitute also carries expanded regulatory approvals (CSA, cURus, PSE, TUV) compared to the original (UL only).

Q: Are the electrical performance characteristics identical?

A: Core electrical specifications are identical. The substitute provides additional documented performance data including breaking capacity (50A AC, 300A DC) and DC cold resistance (0.024 Ohms), which were not specified for the original part.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -55°C to 125°C, ensuring thermal compatibility in equivalent applications.