Littelfuse 025101.5M Fuse Board Mount — Equivalent & Substitute Parts

Part Overview

The Littelfuse 025101.5M is a 1.5 A, 125 V AC/DC board mount axial fuse with fast blow response time, designed for through-hole PCB applications. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Active alternatives maintain identical electrical and mechanical specifications while offering improved availability and compliance status.

Substiute Parts

025101.5M

Littelfuse Inc.In Stock: 1184025101.5M Datasheet

Current PartRFQ

025101.5MXL

Littelfuse Inc.In Stock: 1550025101.5MXL Datasheet

Parametric EquivalentRFQ

025101.5VXL

Littelfuse Inc.In Stock: 1155025101.5VXL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 025101.5M is determined by strict equivalence across all electrical and mechanical parameters. The following criteria define valid substitutes:

• Current rating: 1.5 A (exact match required)
• Voltage rating: 125 V AC and 125 V DC (exact match required)
• Response time: Fast Blow (exact match required)
• Mounting type: Through Hole (exact match required)
• Package / Case: Axial (exact match required)
• Physical dimensions: 0.110" Dia x 0.280" L (exact match required)
• DC cold resistance: 0.0823 Ohms (exact match required)
• Breaking capacity: 50 A AC, 300 A DC (exact match required)
• Approval agencies: CSA, cURus, PSE, TUV (exact match required)

Two active substitutes meet these criteria: 025101.5MXL and 025101.5VXL. Both are manufactured by Littelfuse Inc. within the PICO® II 251 series and provide identical functional performance to the obsolete 025101.5M.

Parameter Comparison

Engineering Selection Recommendations

Both 025101.5MXL and 025101.5VXL are direct functional equivalents to the obsolete 025101.5M. Selection between the two active substitutes should be based on the following factors:

Product Status & Availability: Both substitutes carry Active product status, ensuring long-term availability and supply chain stability compared to the obsolete main part.

Compliance & Regulatory: Both substitutes are ROHS3 compliant and REACH unaffected, providing superior environmental and regulatory compliance compared to the RoHS non-compliant 025101.5M. This is particularly important for applications subject to EU directives or equivalent regional regulations.

Packaging Considerations: Both substitutes are supplied in Bulk packaging. Packaging selection should align with procurement and assembly workflow requirements.

Electrical & Mechanical Equivalence: Both substitutes maintain identical electrical performance (1.5 A, 125 V AC/DC, fast blow response) and mechanical compatibility (through-hole axial package, 0.110" Dia x 0.280" L dimensions). Direct PCB footprint compatibility is assured.

Certifications: Both substitutes retain all original approval agencies (CSA, cURus, PSE, TUV), maintaining compliance with applicable safety standards.

Frequently Asked Questions (FAQ)

Q: Can 025101.5MXL and 025101.5VXL be used interchangeably with 025101.5M?

A: Yes. Both substitutes are parametric equivalents with identical electrical ratings (1.5 A, 125 V AC/DC), response time (fast blow), and physical dimensions (0.110" Dia x 0.280" L). They are direct replacements for through-hole PCB applications.

Q: What is the difference between 025101.5MXL and 025101.5VXL?

A: Both parts are electrically and mechanically identical. The difference lies in the part number suffix, which may indicate internal manufacturing or packaging variations. Both are active products with ROHS3 compliance and REACH unaffected status. Selection can be based on supplier availability or internal part numbering conventions.

Q: Why is the main part 025101.5M classified as obsolete?

A: The 025101.5M is obsolete due to product lifecycle management. The active substitutes 025101.5MXL and 025101.5VXL provide superior compliance (ROHS3 vs. RoHS non-compliant) and ensure continued supply chain support.

Q: Are there any compatibility concerns when substituting 025101.5M with the active alternatives?

A: No compatibility concerns exist. Both substitutes maintain identical breaking capacity (50 A AC, 300 A DC), DC cold resistance (0.0823 Ohms), and operating temperature range (-55°C to 125°C). PCB footprint and electrical performance are fully compatible.

Q: Do the substitutes retain all original safety certifications?

A: Yes. Both 025101.5MXL and 025101.5VXL maintain all original approval agencies: CSA, cURus, PSE, and TUV. Safety and regulatory compliance are preserved.

Q: What packaging options are available for the substitutes?

A: Both substitutes are supplied in Bulk packaging. Confirm packaging requirements with your procurement department or supplier for specific order quantities and delivery formats.