5SF 80 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5SF 80 is an 80 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm form factor. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and holder compatibility to ensure direct functional replacement without circuit redesign.

Key Parameters

Parameter	Value
Current Rating	80 mA
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitute parts for the 5SF 80 are classified based on substitution type and compliance status:

Direct Substitutes (Functionally Equivalent): Parts that match all critical electrical parameters (80 mA, 250 V AC, fast-blow response, 5mm x 20mm package) and maintain identical holder compatibility. These parts are interchangeable without circuit modification.

Similar Parts (Functionally Equivalent with Minor Variations): Parts that meet all critical electrical and mechanical requirements but may have minor differences in secondary parameters such as melting I²t values or DC cold resistance within acceptable engineering tolerances.

Critical Parameters for Substitution:

Current Rating: 80 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Fast Blow (exact match required)
Package Dimensions: 5mm x 20mm (exact match required)
Holder Compatibility: Requires Holder (exact match required)

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage Rating (AC)	Response Time	Package / Case	Breaking Capacity	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status
5SF 80	Bel Fuse Inc.	80 mA	250 V	Fast Blow	5mm x 20mm	35A	0.003	6.8	Obsolete	RoHS non-compliant
0034.1531	SCHURTER Inc.	80 mA	250 V	Fast Blow	5mm x 20mm	35A	0.00102	Not specified	Active	ROHS3 Compliant
0217.080MXBP	Littelfuse Inc.	80 mA	250 V	Fast Blow	5mm x 20mm	35A	0.00083	7.89	Active	ROHS3 Compliant
0217.080MXP	Littelfuse Inc.	80 mA	250 V	Fast Blow	5mm x 20mm	35A	0.00083	7.89	Active	ROHS3 Compliant
0217.080TXP	Littelfuse Inc.	80 mA	250 V	Fast Blow	5mm x 20mm	35A	0.00083	7.89	Active	ROHS3 Compliant
0217.080VXP	Littelfuse Inc.	80 mA	250 V	Fast Blow	5mm x 20mm	35A	0.00083	7.89	Active	ROHS3 Compliant
0217.080HXP	Littelfuse Inc.	80 mA	250 V	Fast Blow	5mm x 20mm	35A	0.00083	7.89	Active	ROHS3 Compliant
GDB-80MA	Eaton - Electronics Division	80 mA	250 V	Fast Blow	5mm x 20mm	35A	0.0012	5	Active	Not specified

Engineering Selection Recommendations

For RoHS3 Compliant Applications: Select from Littelfuse 217 series parts (0217.080MXBP, 0217.080MXP, 0217.080TXP, 0217.080VXP, 0217.080HXP) or SCHURTER 0034.1531. All are active products with full RoHS3 compliance and comprehensive international certifications (CE, CSA, UL, VDE).

For Non-Compliant Legacy Systems: The Eaton GDB-80MA provides functional equivalence with active product status, though RoHS compliance status is not specified.

For Maximum Certification Coverage: Littelfuse 0217.080MXP, 0217.080TXP, 0217.080VXP, and 0217.080HXP offer the broadest approval agency coverage including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications.

For Direct Replacement Priority: SCHURTER 0034.1531 provides the most direct functional replacement with identical electrical specifications and active product status.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the 5SF 80?

A: Yes. All listed substitute parts maintain the critical electrical parameters (80 mA, 250 V AC, fast-blow response) and identical 5mm x 20mm package dimensions required for holder compatibility. Direct substitution is possible without circuit modification.

Q: What is the difference between the Littelfuse 217 series variants (0217.080MXP, 0217.080TXP, 0217.080VXP, 0217.080HXP)?

A: All four Littelfuse variants share identical electrical ratings, dimensions, and performance characteristics. The letter designations (M, T, V, H) represent different product line classifications within the 217 series but do not affect functional equivalence for this 80 mA, 250 V application.

Q: Why is the 5SF 80 obsolete when active substitutes are available?

A: The 5SF 80 has been discontinued by Bel Fuse Inc., but multiple manufacturers including Littelfuse, SCHURTER, and Eaton continue to produce functionally equivalent 80 mA, 250 V, 5mm x 20mm glass cartridge fuses. These active products provide continuity for existing designs and new implementations.

Q: Does the melting I²t value affect substitution compatibility?

A: Melting I²t values vary among substitute parts (ranging from 0.00083 to 0.0012) but all parts maintain the same 80 mA current rating and fast-blow response classification. These variations are within acceptable engineering tolerances for this fuse category and do not prevent direct substitution.

Q: Are all substitute parts RoHS compliant?

A: Littelfuse 217 series parts and SCHURTER 0034.1531 are ROHS3 compliant. The Eaton GDB-80MA RoHS status is not specified in available documentation. For applications requiring RoHS3 compliance, select from the Littelfuse or SCHURTER options.

Q: What certifications should I verify for my specific application?

A: All substitute parts carry international safety certifications. Littelfuse 217 series parts include CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE approvals. SCHURTER 0034.1531 includes CCC, cURus, and VDE approvals. Verify that the selected part's certification set matches your regional and application-specific requirements.

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