Equivalent & Substitute Parts for 5SF 1.6

Part Overview

The Bel Fuse Inc. 5SF 1.6 is a 1.6 A, 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm package format. This component is classified as obsolete, requiring identification of active equivalent and substitute parts for ongoing system support and new designs. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter tolerances.

Key Parameters

Parameter	Value
Current Rating	1.6 A
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	35 A
Operating Temperature Range	-55°C to 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (1.6 A), voltage rating (250 V AC), response time (fast blow), package dimensions (5mm x 20mm), fuse type (cartridge glass), and mounting configuration (requires holder). All substitute parts listed maintain these core electrical and mechanical specifications.

Direct substitutes are classified as parts with identical electrical characteristics and active product status. Similar substitutes are parts meeting all core electrical parameters but with variations in breaking capacity or melting I²t characteristics that remain within acceptable operational ranges for the 5SF 1.6 application envelope.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	Product Status	RoHS Status
5SF 1.6	Bel Fuse Inc.	1.6	250	Fast Blow	5mm x 20mm	35	4	Obsolete	Non-compliant
5SF 1.6-R	Bel Fuse Inc.	1.6	250	Fast Blow	5mm x 20mm	35	4	Active	ROHS3 Compliant
0034.1518	SCHURTER Inc.	1.6	250	Fast Blow	5mm x 20mm	35	2.94	Active	ROHS3 Compliant
021701.6MXBP	Littelfuse Inc.	1.6	250	Fast Blow	5mm x 20mm	35	4.615	Active	ROHS3 Compliant
021701.6MXP	Littelfuse Inc.	1.6	250	Fast Blow	5mm x 20mm	35	4.615	Active	ROHS3 Compliant
021701.6TXP	Littelfuse Inc.	1.6	250	Fast Blow	5mm x 20mm	35	4.615	Active	ROHS3 Compliant
021701.6VXP	Littelfuse Inc.	1.6	250	Fast Blow	5mm x 20mm	35	4.615	Active	ROHS3 Compliant
021701.6HXP	Littelfuse Inc.	1.6	250	Fast Blow	5mm x 20mm	35	4.615	Active	ROHS3 Compliant
023501.6HXP	Littelfuse	1.6	250	Fast Blow	5mm x 20mm	100	2.025	Active	ROHS3 Compliant

Engineering Selection Recommendations

For replacement of the obsolete 5SF 1.6, the 5SF 1.6-R from Bel Fuse Inc. is the primary direct substitute, offering identical electrical specifications with active product status and ROHS3 compliance.

Littelfuse 217 series parts (021701.6MXBP, 021701.6MXP, 021701.6TXP, 021701.6VXP, 021701.6HXP) provide direct electrical equivalence with extended certification coverage including CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE approvals. These parts are actively manufactured with high inventory availability.

The SCHURTER 0034.1518 (FSF 5x20 series) maintains core electrical parameters with active status and ROHS3 compliance, supported by CCC, cURus, PSE/JET, and VDE certifications.

The Littelfuse 023501.6HXP (235 series) is classified as a similar substitute due to elevated breaking capacity (100 A versus 35 A) and reduced melting I²t (2.025 versus 4.615). This part is suitable for applications where higher breaking capacity is beneficial or required.

Frequently Asked Questions (FAQ)

Q: Can 5SF 1.6-R directly replace the obsolete 5SF 1.6?

A: Yes. The 5SF 1.6-R maintains identical current rating (1.6 A), voltage rating (250 V AC), response time (fast blow), package dimensions (5mm x 20mm), and breaking capacity (35 A). Both require the same holder configuration.

Q: What is the difference between Littelfuse 021701.6MXP and 021701.6TXP?

A: Both parts share identical electrical specifications: 1.6 A, 250 V AC, fast-blow response, 5mm x 20mm package, 35 A breaking capacity, and 4.615 melting I²t. The difference lies in certification scope. 021701.6TXP includes KC certification, while 021701.6MXP includes K-MARK certification.

Q: Why does 023501.6HXP have a higher breaking capacity (100 A)?

A: The 023501.6HXP belongs to the Littelfuse 235 series, which is designed for applications requiring higher breaking capacity. Despite this difference, it maintains the required 1.6 A current rating, 250 V voltage rating, fast-blow response, and 5mm x 20mm package format, making it suitable as a similar substitute where elevated breaking capacity is acceptable.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are ROHS3 compliant. The original 5SF 1.6 is RoHS non-compliant, making the transition to compliant alternatives necessary for new designs and regulatory adherence.

Q: What certifications should I prioritize when selecting a substitute?

A: Selection should be based on the specific certifications required by your application and regional standards. Littelfuse 217 series parts offer the broadest certification coverage (CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, VDE). SCHURTER 0034.1518 provides CCC, cURus, PSE/JET, and VDE certifications. Verify that the selected part's certification set meets your system requirements.

Q: Can I use these substitutes interchangeably in existing designs?

A: Yes, provided the fuse holder is compatible with the 5mm x 20mm package format. All listed parts maintain this standard package dimension and require the same holder configuration as the original 5SF 1.6.

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