5TTP 4 Equivalent & Substitute Parts

Part Overview

The 5TTP 4 is a 4A 125VAC slow-blow glass cartridge fuse with a 5mm x 20mm axial form factor, manufactured by Bel Fuse Inc. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing system maintenance and component procurement. The 5TTP 4-R serves as the direct active substitute, maintaining identical electrical and mechanical specifications while offering improved compliance status and current inventory availability.

Substiute Parts

5TTP 4

Bel Fuse Inc.In Stock: 8175TTP 4 Datasheet

Current PartRFQ

5TTP 4-R

Bel Fuse Inc.In Stock: 19285TTP 4-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 5TTP 4-R qualifies as a direct substitute for the 5TTP 4 based on the following critical parameters:

• Current Rating: Both parts rated at 4 A
• Voltage Rating: Both rated at 125 V AC
• Fuse Type & Response: Both are slow-blow glass cartridge fuses
• Physical Form Factor: Both use 5mm x 20mm axial package
• Breaking Capacity: Both rated at 10kA @ rated voltage
• Melting I²t: Both specified at 103
• Operating Temperature: Both operate across -55°C ~ 125°C
• Mounting Configuration: Both are through-hole mounted
• Certifications: Both carry CE, CSA, and PSE approvals

The substitution is based on functional equivalence across all specified electrical and mechanical parameters. The primary distinction is product status and compliance certification level.

Parameter Comparison

Engineering Selection Recommendations

The 5TTP 4-R is the appropriate selection for new designs and component replacement applications. This part maintains full electrical and mechanical compatibility with the obsolete 5TTP 4 while offering the following advantages:

• Active Product Status: The 5TTP 4-R is actively manufactured and supported, ensuring long-term availability and supply chain continuity.
• Enhanced Compliance: The 5TTP 4-R meets ROHS3 compliance requirements, whereas the original 5TTP 4 is non-compliant. This distinction is critical for applications subject to RoHS regulations.
• Improved Inventory: The 5TTP 4-R maintains significantly higher stock levels (1868 Pcs vs. 749 Pcs), supporting procurement reliability.
• Equivalent Performance: DC cold resistance values are functionally equivalent (0.029 Ohms vs. 0.03 Ohms), with no impact on circuit performance.

Both parts carry identical regulatory certifications (CE, CSA, PSE) and are suitable for applications requiring 4A 125VAC slow-blow protection in 5mm x 20mm through-hole configurations.

Frequently Asked Questions (FAQ)

Q: Can the 5TTP 4-R be used as a direct replacement for the 5TTP 4 in existing assemblies?

A: Yes. The 5TTP 4-R is electrically and mechanically identical to the 5TTP 4 across all specified parameters, including current rating, voltage rating, response time, package dimensions, and breaking capacity. No circuit modifications are required.

Q: What is the significance of the RoHS compliance difference?

A: The 5TTP 4-R is ROHS3 compliant, while the 5TTP 4 is non-compliant. For applications subject to RoHS regulations (particularly in EU markets or for regulated industries), the 5TTP 4-R is the required choice. For legacy systems without RoHS requirements, both parts are functionally equivalent.

Q: Are there any performance differences between these parts?

A: No. Both parts are rated identically for current (4A), voltage (125V AC), response time (slow-blow), breaking capacity (10kA), and melting I²t (103). The DC cold resistance values (0.03 Ohms vs. 0.029 Ohms) are negligible and do not affect circuit operation.

Q: Why is the 5TTP 4 marked as obsolete?

A: The 5TTP 4 has been superseded by the 5TTP 4-R in the manufacturer's product line. The 5TTP 4-R offers improved compliance and is the active production part. Existing inventory of the 5TTP 4 remains available but is not recommended for new designs.

Q: Are the physical dimensions identical?

A: Yes. Both parts use the same 5mm x 20mm (0.217" Dia x 0.827" L) axial form factor and are mounted identically as through-hole components. No PCB layout or mechanical design changes are necessary.

Q: What certifications apply to both parts?

A: Both the 5TTP 4 and 5TTP 4-R carry CE, CSA, and PSE approvals, confirming compliance with relevant safety and performance standards for fuse cartridges in their rated voltage and current class.