5SFP 125 Equivalent & Substitute Parts

Part Overview

The 5SFP 125 is a 125 mA, 250 V AC/DC fast-blow glass cartridge fuse with a 5mm x 20mm axial through-hole package manufactured by Bel Fuse Inc. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, response characteristics, and mechanical compatibility to ensure proper circuit protection without modification to existing designs.

Substiute Parts

5SFP 125

Bel Fuse Inc.In Stock: 8775SFP 125 Datasheet

Current PartRFQ

0217.125MXEP

Littelfuse Inc.In Stock: 10610217.125MXEP Datasheet

SimilarRFQ

0235.125MXEP

Littelfuse Inc.In Stock: 8510235.125MXEP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5SFP 125 are qualified based on the following mandatory electrical and mechanical parameters:

• Current Rating: 125 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 35 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

The identified substitute parts 0217.125MXEP and 0235.125MXEP from Littelfuse Inc. meet all mandatory electrical and mechanical criteria. Both parts are manufactured by an established fuse supplier and maintain active product status, providing long-term availability for replacement and new applications.

Parameter Comparison

Engineering Selection Recommendations

Both 0217.125MXEP and 0235.125MXEP are functionally equivalent to the 5SFP 125 based on electrical and mechanical parameters. Selection between these two Littelfuse alternatives depends on regulatory and compliance requirements:

The 0217.125MXEP offers broader international certification coverage (CCC, K-MARK) and ROHS3 compliance, making it suitable for applications requiring comprehensive global regulatory approval.

The 0235.125MXEP provides ROHS3 compliance with CE, CSA, KC, and UL certifications, appropriate for applications with specific regional compliance mandates.

Both substitute parts are in active production status, ensuring long-term supply availability compared to the obsolete 5SFP 125.

Frequently Asked Questions (FAQ)

Q: Can 0217.125MXEP and 0235.125MXEP be used interchangeably with 5SFP 125?

A: Both parts meet the mandatory electrical and mechanical specifications (125 mA, 250 V AC, fast-blow, 5mm x 20mm through-hole package, 35 A breaking capacity). They are mechanically and electrically compatible for direct substitution in applications using the 5SFP 125.

Q: What is the difference between 0217.125MXEP and 0235.125MXEP?

A: Both parts share identical electrical ratings and mechanical dimensions. Differences exist in DC cold resistance (3.82 Ohms vs. 5.75 Ohms), melting I²t values (0.00478 vs. 0.00273), and certification scope. Selection should be based on specific regulatory requirements and application compliance mandates.

Q: Why is the 5SFP 125 listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Littelfuse alternatives 0217.125MXEP and 0235.125MXEP provide equivalent functionality with active production status and modern RoHS3 compliance.

Q: Are the physical dimensions identical between all three parts?

A: The 5SFP 125 has dimensions of 0.217" Dia x 0.827" L (5.50mm x 21.00mm). The Littelfuse substitutes have dimensions of 0.236" Dia x 0.886" L (6.00mm x 22.50mm). These minor dimensional variations remain within through-hole package compatibility for standard fuse holders.

Q: Which certifications should I prioritize for my application?

A: Certification selection depends on your target market and regulatory requirements. The 0217.125MXEP includes CCC and K-MARK certifications for Asian markets. The 0235.125MXEP includes KC certification. Both include CE, CSA, and UL certifications for North American and European applications.