5STP 1.6 Equivalent & Substitute Parts

Part Overview

The 5STP 1.6 is a 1.6 A 250 V AC/DC fuse cartridge manufactured by Bel Fuse Inc., featuring a glass construction with 5mm x 20mm axial through-hole mounting. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The slow-blow response characteristic provides circuit protection suitable for applications with inrush current requirements.

Key Parameters

Parameter	Value
Current Rating	1.6 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm (Axial)
Response Time	Slow Blow
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	35 A

Substitute Part Grouping Explanation

Substitution for the 5STP 1.6 is determined by strict equivalence across the following electrical and mechanical parameters:

Current Rating: 1.6 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package / Case: 5mm x 20mm (Axial) (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Through Hole (exact match required)

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents: Parts from Bel Fuse Inc. and SCHURTER Inc. that maintain identical electrical and mechanical specifications with the main part.

Parametric Equivalents: Parts from Bel Fuse Inc. and Littelfuse Inc. that match all critical electrical and mechanical parameters but may differ in secondary characteristics such as breaking capacity, melting I²t, or DC cold resistance.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Package / Case	Response Time	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status
5STP 1.6	Bel Fuse Inc.	1.6	250	5mm x 20mm (Axial)	Slow Blow	35	6.9	0.04	Obsolete	RoHS non-compliant
5STP 1.6-R	Bel Fuse Inc.	1.6	250	5mm x 20mm (Axial)	Slow Blow	35	6.9	0.04	Active	ROHS3 Compliant
5ETP 1.6-R	Bel Fuse Inc.	1.6	250	5mm x 20mm (Axial)	Slow Blow	150	62	0.059	Active	ROHS3 Compliant
5TTP 1.6-R	Bel Fuse Inc.	1.6	250	5mm x 20mm (Axial)	Slow Blow	100	19.7	0.12	Active	ROHS3 Compliant
0034.3119.PT	SCHURTER Inc.	1.6	250	5mm x 20mm (Axial)	Slow Blow	35	10.5	—	Active	ROHS3 Compliant
021301.6MRET1P	Littelfuse	1.6	250	5mm x 20mm (Axial)	Slow Blow	35	44.2	0.0551	Active	ROHS3 Compliant
021801.6MXEP	Littelfuse Inc.	1.6	250	5mm x 20mm (Axial)	Slow Blow	35	23.35	0.0336	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 5STP 1.6-R

The 5STP 1.6-R from Bel Fuse Inc. is the direct active equivalent to the obsolete 5STP 1.6. It maintains identical electrical and mechanical specifications while offering ROHS3 compliance and active product status. This part is suitable for direct replacement in all applications where the original 5STP 1.6 was specified.

Secondary Recommendations: 5ETP 1.6-R and 5TTP 1.6-R

Both 5ETP 1.6-R and 5TTP 1.6-R are parametric equivalents from Bel Fuse Inc. with active product status and ROHS3 compliance. These parts differ in breaking capacity and melting I²t characteristics. Selection between these options depends on application-specific requirements for fault current handling and thermal response.

Cross-Manufacturer Alternatives: 0034.3119.PT, 021301.6MRET1P, 021801.6MXEP

The SCHURTER 0034.3119.PT and Littelfuse 021301.6MRET1P and 021801.6MXEP are parametric equivalents with active product status and ROHS3 compliance. These parts maintain the required electrical and mechanical parameters but originate from different manufacturers. Selection of cross-manufacturer alternatives should account for supply chain considerations and application-specific certification requirements.

Frequently Asked Questions (FAQ)

Q: Can the 5STP 1.6-R be used as a direct replacement for the obsolete 5STP 1.6?

A: Yes. The 5STP 1.6-R maintains identical current rating, voltage rating, package dimensions, response time, and breaking capacity. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q: What is the difference between 5STP 1.6-R, 5ETP 1.6-R, and 5TTP 1.6-R?

A: All three parts share identical electrical ratings (1.6 A, 250 V AC) and package dimensions. They differ in breaking capacity and melting I²t: 5STP 1.6-R has 35 A breaking capacity and 6.9 melting I²t; 5ETP 1.6-R has 150 A breaking capacity and 62 melting I²t; 5TTP 1.6-R has 100 A breaking capacity and 19.7 melting I²t. Selection depends on the maximum fault current expected in the application.

Q: Are cross-manufacturer parts (SCHURTER, Littelfuse) compatible with the original 5STP 1.6 footprint?

A: Cross-manufacturer parts maintain the required 5mm x 20mm axial package specification. However, dimensional variations exist: SCHURTER 0034.3119.PT measures 5.40mm diameter x 22.50mm length; Littelfuse parts measure 5.80mm diameter x 22.50mm length. Verify mechanical clearance in the target application before substitution.

Q: What certifications apply to substitute parts?

A: The 5STP 1.6-R carries CCC, CE, CSA, cULus, IMQ, SEMKO, and VDE certifications. The 5ETP 1.6-R and 5TTP 1.6-R carry CCC, CE, CSA, cULus, SEMKO, and VDE certifications (5TTP 1.6-R includes PSE). Cross-manufacturer parts carry varying certification sets. Verify that substitute part certifications meet application and regional requirements.

Q: Is RoHS compliance a factor in selecting a substitute?

A: The original 5STP 1.6 is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant. For applications subject to RoHS regulations, any active substitute part satisfies compliance requirements.

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