Equivalent & Substitute Parts for 5SFP 1

Part Overview

The 5SFP 1 is a 1 A 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. Due to its obsolete status, equivalent and substitute parts from active manufacturers are available to maintain design continuity and ensure supply chain reliability. Substitute parts maintain the same electrical ratings, mechanical dimensions, and functional performance while offering improved availability and compliance status.

Substiute Parts

5SFP 1

Bel Fuse Inc.In Stock: 11405SFP 1 Datasheet

Current PartRFQ

5SFP 1-R

Bel Fuse Inc.In Stock: 37145SFP 1-R Datasheet

DirectRFQ

5MFP 1-R

Bel Fuse Inc.In Stock: 13525MFP 1-R Datasheet

Parametric EquivalentRFQ

0034.1516.PT

SCHURTER Inc.In Stock: 37620034.1516.PT Datasheet

DirectRFQ

0217001.MXEP

Littelfuse Inc.In Stock: 24490217001.MXEP Datasheet

DirectRFQ

FSD-P-1A

OptiFuseIn Stock: 9485FSD-P-1A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence in the following parameters:

• Current Rating: 1 A (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)
• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed meet these criteria. Variations in secondary parameters such as breaking capacity, melting I²t, DC cold resistance, and approval agencies do not preclude substitution when primary electrical and mechanical parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 5SFP 1:

5SFP 1-R (Bel Fuse Inc.) is the primary direct substitute, offering identical electrical and mechanical specifications with active product status and ROHS3 compliance. This part maintains the same series designation and is the recommended first choice for direct substitution.

0217001.MXEP (Littelfuse Inc.) and FSD-P-1A (OptiFuse) are parametric equivalents with active status and ROHS3 compliance. Both maintain identical current, voltage, and response characteristics. These parts are suitable where multi-source qualification is required.

0034.1516.PT (SCHURTER Inc.) is a parametric equivalent with active status and ROHS3 compliance, suitable for applications requiring alternative manufacturer sourcing.

5MFP 1-R (Bel Fuse Inc.) is a parametric equivalent with higher breaking capacity (200 A vs. 35 A) and lower melting I²t (0.877 vs. 1.6). This part is suitable for applications where enhanced breaking capacity is beneficial or where the lower melting I²t characteristic is acceptable.

All substitute parts operate within the -55°C ~ 125°C temperature range and are approved for AC/DC operation at 250 V.

Frequently Asked Questions (FAQ)

Q: Can 5SFP 1-R be used as a direct replacement for 5SFP 1?

A: Yes. 5SFP 1-R is a direct substitute with identical electrical ratings (1 A, 250 V AC/DC), response time (fast blow), and mechanical package (5mm x 20mm axial). The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between direct substitutes and parametric equivalents?

A: Direct substitutes share the same manufacturer and series designation (5SFP 1-R). Parametric equivalents (5MFP 1-R, 0034.1516.PT, 0217001.MXEP, FSD-P-1A) are from different manufacturers or series but maintain identical primary electrical and mechanical parameters. All are functionally equivalent for the specified application.

Q: Are there dimensional differences between substitute parts?

A: Nominal package dimensions are 5mm x 20mm (axial) for all parts. Minor dimensional variations exist: 0034.1516.PT measures 0.213" Dia x 0.886" L (5.40mm x 22.50mm), and 0217001.MXEP measures 0.228" Dia x 0.886" L (5.80mm x 22.50mm). These variations remain within standard tolerance for 5x20mm cartridge fuses and do not affect mechanical fit in standard fuse holders.

Q: What is the significance of melting I²t values?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Lower values indicate faster response to overcurrent. Variations in melting I²t (ranging from 0.877 to 1.6 across substitutes) reflect different fuse element designs but do not affect substitution eligibility when current rating and response time are identical.

Q: Which substitute parts have the highest approval agency coverage?

A: 0217001.MXEP (Littelfuse Inc.) carries the broadest approval coverage: BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE. This part is suitable for applications requiring multi-regional compliance certification.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (5SFP 1-R, 5MFP 1-R, 0034.1516.PT, 0217001.MXEP, FSD-P-1A) are ROHS3 compliant. The original 5SFP 1 is RoHS non-compliant.