5SFP 800 Equivalent & Substitute Parts

Part Overview

The 5SFP 800 is an 800 mA, 250 V AC/DC fast-blow glass cartridge fuse with a 5mm x 20mm axial form factor, manufactured by Bel Fuse Inc. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement. Substitute parts maintain the same electrical ratings and mechanical form factor while offering active product status and improved compliance certifications.

Substiute Parts

5SFP 800

Bel Fuse Inc.In Stock: 7845SFP 800 Datasheet

Current PartRFQ

5SFP 800-R

Bel Fuse Inc.In Stock: 18765SFP 800-R Datasheet

DirectRFQ

5MFP 800-R

Bel Fuse Inc.In Stock: 18035MFP 800-R Datasheet

Parametric EquivalentRFQ

0034.1515.PT

SCHURTER Inc.In Stock: 39660034.1515.PT Datasheet

DirectRFQ

0217.800MXEP

Littelfuse Inc.In Stock: 29440217.800MXEP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 5SFP 800 is determined by strict equivalence across the following parameters: current rating (800 mA), voltage rating (250 V AC), response time (fast blow), package dimensions (5mm x 20mm axial), and fuse type (cartridge, glass). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring direct functional compatibility in through-hole applications.

The substitute parts are grouped into two categories:

Direct Manufacturer Substitutes (Same Series): Parts from Bel Fuse Inc. within the 5SFP series that share identical electrical ratings and form factors.

Parametric Equivalents (Cross-Manufacturer): Parts from alternative manufacturers (Littelfuse Inc., SCHURTER Inc.) that meet the same electrical and mechanical requirements, enabling multi-source procurement strategies.

Parameter Comparison

Engineering Selection Recommendations

5SFP 800-R (Bel Fuse Inc.): This is the direct replacement within the same manufacturer series. It maintains identical electrical specifications and form factor as the original 5SFP 800 while offering active product status and ROHS3 compliance. This part is the preferred choice for direct substitution when Bel Fuse sourcing is established.

5MFP 800-R (Bel Fuse Inc.): This parametric equivalent shares the same current, voltage, and response time ratings. It differs in breaking capacity (200 A versus 35 A) and melting I²t (0.398 versus 1.01), indicating faster thermal response. Selection of this part requires confirmation that the higher breaking capacity and faster melting characteristics are compatible with the circuit design.

0034.1515.PT (SCHURTER Inc.): This cross-manufacturer substitute meets all core electrical and mechanical requirements. Physical dimensions show minor variation (5.40mm x 22.50mm versus 5.50mm x 21.00mm), which may require mechanical clearance verification in confined mounting spaces. ROHS3 compliance and active product status support long-term availability.

0217.800MXEP (Littelfuse Inc.): This substitute provides multi-source procurement flexibility with active product status and comprehensive certification coverage (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). Physical dimensions (5.80mm x 22.50mm) represent the largest variation among substitutes and require mechanical fit confirmation. DC cold resistance (0.1203 Ohms) falls within the range of alternatives.

Frequently Asked Questions (FAQ)

Q: Can I use 5MFP 800-R as a direct replacement for 5SFP 800?

A: The 5MFP 800-R meets the core electrical requirements (800 mA, 250 V, fast blow, 5mm x 20mm). However, it has a higher breaking capacity (200 A) and lower melting I²t (0.398), indicating faster thermal response. Use this part only if circuit analysis confirms these characteristics are acceptable.

Q: What is the difference between the Bel Fuse and cross-manufacturer substitutes?

A: The Bel Fuse 5SFP 800-R is the direct series replacement with identical specifications. Cross-manufacturer parts (SCHURTER 0034.1515.PT and Littelfuse 0217.800MXEP) provide alternative sourcing while maintaining electrical equivalence. Physical dimensions vary slightly among cross-manufacturer options.

Q: Are there mechanical compatibility concerns with substitute parts?

A: All substitute parts use the 5mm x 20mm axial form factor. Minor dimensional variations exist: SCHURTER (5.40mm x 22.50mm) and Littelfuse (5.80mm x 22.50mm) versus the original (5.50mm x 21.00mm). Verify clearance in confined mounting spaces before selection.

Q: Which substitute offers the best compliance profile?

A: All active substitute parts are ROHS3 compliant. The Littelfuse 0217.800MXEP offers the broadest certification coverage (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE), supporting global regulatory requirements. The Bel Fuse 5SFP 800-R includes cULus certification, suitable for North American applications.

Q: Why is the original 5SFP 800 marked as obsolete?

A: The 5SFP 800 is obsolete due to RoHS non-compliance and limited active manufacturing. All substitute parts maintain functional equivalence while offering ROHS3 compliance and active product status, ensuring long-term component availability and regulatory alignment.