5SFP 80 Equivalent & Substitute Parts

Part Overview

The 5SFP 80 is an 80 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 80

Bel Fuse Inc.In Stock: 9565SFP 80 Datasheet

Current PartRFQ

0217.080MXEP

Littelfuse Inc.In Stock: 12020217.080MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5SFP 80 is determined by strict equivalence across the following critical parameters:

• Current Rating: Must be exactly 80 mA
• Voltage Rating (AC): Must be 250 V minimum
• Fuse Type: Must be cartridge glass construction
• Response Time: Must be fast-blow characteristic
• Package Dimensions: Must accommodate 5mm x 20mm axial through-hole mounting
• Breaking Capacity: Must meet or exceed 35 A @ rated voltage
• Operating Temperature: Must support -55°C ~ 125°C range

The substitute part 0217.080MXEP (Littelfuse Inc., Series 217) satisfies all mandatory electrical and mechanical parameters. Physical dimensions show minor variation (0.236" Dia x 0.886" L versus 0.217" Dia x 0.827" L), which remains within acceptable tolerance for standard through-hole fuse holder compatibility. Both parts are approved under identical certification standards (CE, CSA, SEMKO, UL, VDE).

Parameter Comparison

Engineering Selection Recommendations

The 0217.080MXEP from Littelfuse Inc. is the direct functional equivalent for the obsolete 5SFP 80. Selection of this substitute is based on:

• Electrical Equivalence: Identical current rating (80 mA), voltage rating (250 V AC), and response time (fast-blow) ensure equivalent circuit protection performance.
• Mechanical Compatibility: Both parts use identical 5mm x 20mm axial through-hole packaging, compatible with standard fuse holders without modification.
• Certification Alignment: Both parts carry CE, CSA, SEMKO, UL, and VDE approvals, meeting the same regulatory requirements.
• Product Status: The substitute is active and in production, ensuring long-term availability (1094 pcs in stock versus 867 pcs for the obsolete original).
• Compliance Enhancement: The substitute achieves ROHS3 compliance, whereas the original is non-compliant, providing environmental and regulatory advantage in new designs.

The minor increase in DC cold resistance (7.89 Ohms versus 6.8 Ohms) and melting I²t value (0.00083 versus 0.003) does not affect functional equivalence for standard circuit protection applications within the specified electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can the 0217.080MXEP be used as a direct replacement in existing designs using the 5SFP 80?

A: Yes. Both parts are mechanically and electrically equivalent. The 5mm x 20mm axial through-hole package is identical, and electrical ratings (80 mA, 250 V AC, fast-blow) match exactly. No circuit modifications are required.

Q: What is the significance of the RoHS compliance difference?

A: The original 5SFP 80 is RoHS non-compliant, while the 0217.080MXEP is ROHS3 compliant. For new designs or systems subject to RoHS regulations, the Littelfuse substitute is the appropriate choice. For legacy system maintenance, either part functions identically.

Q: Are there dimensional differences that could affect fuse holder compatibility?

A: Physical dimensions show minor variation (0.236" Dia x 0.886" L for the substitute versus 0.217" Dia x 0.827" L for the original). These differences remain within standard tolerance for through-hole fuse holder acceptance. Both parts are designed for the same 5mm x 20mm package class.

Q: How do the DC cold resistance values affect circuit operation?

A: DC cold resistance (6.8 Ohms original, 7.89 Ohms substitute) represents the fuse element resistance at room temperature. The difference is negligible for standard circuit protection applications and does not affect the fuse's ability to carry rated current or respond to overcurrent conditions.

Q: What certifications apply to both parts?

A: Both the 5SFP 80 and 0217.080MXEP carry CE, CSA, SEMKO, UL, and VDE approvals. The substitute additionally holds CCC and K-MARK certifications, providing broader regulatory coverage.

Q: Is the substitute available in the same packaging format?

A: The 0217.080MXEP is supplied in bulk packaging, whereas the original 5SFP 80 packaging format is not specified. Both are through-hole components compatible with standard fuse holder installations.