5ETP 1.6-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5ETP 1.6-R is a 1.6 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm through-hole package. This component is actively produced and widely used in circuit protection applications requiring slow-blow response characteristics. Finding equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and maintain compatibility across manufacturing batches and sourcing options.

Substiute Parts

5ETP 1.6-R

Bel Fuse Inc.In Stock: 21735ETP 1.6-R Datasheet

Current PartRFQ

5TTP 1.6-R

Bel Fuse Inc.In Stock: 21825TTP 1.6-R Datasheet

Parametric EquivalentRFQ

021801.6MXEP

Littelfuse Inc.In Stock: 2244021801.6MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5ETP 1.6-R is determined by the following critical parameters:

• Current Rating: Must be 1.6 A
• Voltage Rating (AC): Must be 250 V
• Fuse Type: Must be Cartridge, Glass
• Response Time: Must be Slow Blow
• Package / Case: Must be 5mm x 20mm (Axial)
• Mounting Type: Must be Through Hole
• Operating Temperature Range: Must support -55°C ~ 125°C
• RoHS Compliance: Must be ROHS3 Compliant

Parts meeting all these criteria are classified as parametric equivalents or similar substitutes. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies do not disqualify a part from substitution, provided the core electrical and mechanical parameters remain identical.

Parameter Comparison

Engineering Selection Recommendations

All three parts listed meet the core substitution criteria and are actively produced. Selection should be based on the following considerations:

5ETP 1.6-R (Bel Fuse Inc.) — Primary reference part. Highest breaking capacity (150 A) and highest melting I²t (62). Broadest approval agency coverage including CCC, CE, CSA, cULus, SEMKO, and VDE. Suitable for applications requiring maximum fault protection margin.

5TTP 1.6-R (Bel Fuse Inc.) — Parametric equivalent from the same manufacturer. Lower breaking capacity (100 A) and melting I²t (19.7) compared to 5ETP. Approval agencies include CE, CSA, cULus, and PSE. Suitable for applications with lower fault current requirements.

021801.6MXEP (Littelfuse Inc.) — Cross-manufacturer substitute. Lowest breaking capacity (35 A) and melting I²t (23.35). Lowest DC cold resistance (0.0336 Ohms). Broadest approval agency coverage including CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE. Suitable for applications requiring UL certification or where Littelfuse supply chain is preferred.

Frequently Asked Questions (FAQ)

Q: Can 5TTP 1.6-R replace 5ETP 1.6-R in all applications?

A: Both parts meet identical core electrical and mechanical specifications (1.6 A, 250 V, slow-blow, 5mm x 20mm). The primary difference is breaking capacity: 5ETP has 150 A versus 5TTP at 100 A. Substitution is valid if the application's maximum fault current does not exceed 100 A.

Q: What is the significance of breaking capacity differences?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt without rupturing or creating a hazard. Higher breaking capacity provides greater safety margin in high-fault-current environments. Lower breaking capacity is acceptable in applications with inherently lower fault currents.

Q: Can Littelfuse 021801.6MXEP be used as a direct substitute?

A: Yes. The 021801.6MXEP meets all core substitution criteria. Physical dimensions are slightly larger (5.80mm x 22.50mm versus 5.50mm x 21.00mm), but remain within the 5mm x 20mm package classification. Verify PCB footprint clearance before substitution.

Q: Are there approval agency differences that affect substitution?

A: All three parts carry multiple international certifications. The 021801.6MXEP includes UL certification, which may be required in specific applications. The 5ETP includes SEMKO and VDE certifications. Verify your application's specific certification requirements before final selection.

Q: What does slow-blow response time mean?

A: Slow-blow fuses tolerate temporary current surges without opening, responding only to sustained overcurrent conditions. This characteristic is identical across all three substitute parts and is essential for applications with inrush currents during normal operation.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes, provided the PCB footprint accommodates the physical dimensions. The 021801.6MXEP is slightly larger (5.80mm x 22.50mm) than the Bel Fuse parts (5.50mm x 21.00mm). Verify clearance around the fuse holder before substitution.