Littelfuse 025301.5M Equivalent & Substitute Parts

Part Overview

The Littelfuse 025301.5M is a 1.5 A, 125 V AC/DC board mount axial fuse in the PICO® II 253 series. This component is designed for through-hole PCB applications requiring fast-blow protection at low current ratings. The part maintains active product status with full compliance to international safety standards including CSA, PSE, QPL, TUV, and UR certifications. Substitute parts are identified when electrical characteristics, mechanical dimensions, and regulatory approvals remain identical across manufacturing batches or variant designations.

Substiute Parts

025301.5M

Littelfuse Inc.In Stock: 1046025301.5M Datasheet

Current PartRFQ

025301.5V

Littelfuse Inc.In Stock: 1612025301.5V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 025301.5M is determined by strict equivalence across the following critical parameters:

• Current Rating: 1.5 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (both must match)
• Response Time: Fast Blow (characteristic must be identical)
• Mounting Type: Through Hole (mechanical compatibility)
• Package / Case: Axial (physical form factor)
• Breaking Capacity: 50 A AC, 300 A DC (fault protection capability)
• Melting I²t: 0.587 (thermal energy threshold)
• Operating Temperature: -55°C to 125°C (environmental range)
• Physical Dimensions: 0.103" Dia × 0.280" L (PCB footprint compatibility)
• DC Cold Resistance: 0.0823 Ohms (electrical performance)
• Regulatory Compliance: CSA, PSE, QPL, TUV, UR (certification requirement)

The substitute part 025301.5V meets all these criteria and is classified as a parametric equivalent within the PICO® II 253 series.

Parameter Comparison

Engineering Selection Recommendations

Both the 025301.5M and 025301.5V are active products from Littelfuse Inc. with identical electrical, mechanical, and thermal specifications. Selection between these parts is based on availability and supply chain considerations rather than technical differentiation.

The 025301.5V currently maintains higher inventory availability (1545 Pcs) compared to the 025301.5M (1006 Pcs). Both parts carry full compliance with CSA, PSE, QPL, TUV, and UR certifications, ensuring regulatory acceptance in equivalent applications.

For applications requiring the PICO® II 253 series 1.5 A, 125 V AC/DC fast-blow fuse in axial through-hole configuration, either part number is functionally and mechanically interchangeable without design modification or re-qualification.

Frequently Asked Questions (FAQ)

Q: Can 025301.5V be used as a direct replacement for 025301.5M in existing designs?

A: Yes. Both parts are parametric equivalents with identical current rating, voltage rating, response time, physical dimensions, and regulatory certifications. No PCB layout or schematic changes are required.

Q: Are there any differences in breaking capacity between these parts?

A: No. Both parts have identical breaking capacity of 50 A AC and 300 A DC at rated voltage.

Q: Do both parts meet the same international safety standards?

A: Yes. Both 025301.5M and 025301.5V carry CSA, PSE, QPL, TUV, and UR approvals.

Q: What is the significance of the melting I²t value of 0.587?

A: The melting I²t represents the thermal energy threshold at which the fuse element melts. This value is identical for both parts, ensuring identical thermal response characteristics in circuit protection applications.

Q: Are the physical dimensions identical for PCB footprint compatibility?

A: Yes. Both parts have identical dimensions of 0.103" diameter × 0.280" length (2.61 mm × 7.11 mm), ensuring identical through-hole PCB footprint compatibility.

Q: What is the operating temperature range for these fuses?

A: Both parts operate across -55°C to 125°C, providing equivalent thermal performance across industrial and commercial temperature ranges.

Q: Is RoHS compliance identical between both parts?

A: Yes. Both 025301.5M and 025301.5V are ROHS3 compliant.