5TTP 4-R Equivalent & Substitute Parts

Part Overview

The 5TTP 4-R is a 4A 125VAC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc., designed for through-hole mounting in 5mm x 20mm form factor applications. This component is actively produced and stocked. Substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part becomes unavailable or when design requirements permit functional equivalents.

Substiute Parts

5TTP 4-R

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

Current PartRFQ

0239004.MXEP

Littelfuse Inc.In Stock: 10060239004.MXEP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5TTP 4-R is determined by strict equivalence across the following critical parameters:

• Current Rating: 4 A (exact match required)
• Voltage Rating (AC): 125 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 10kA (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

The substitute part 0239004.MXEP (Littelfuse Inc., Series 239) meets all critical electrical and mechanical parameters, enabling direct functional replacement in applications requiring a 4A 125VAC slow-blow glass cartridge fuse with through-hole mounting.

Parameter Comparison

Engineering Selection Recommendations

Both the 5TTP 4-R and 0239004.MXEP are active products with ROHS3 compliance and REACH unaffected status. The 0239004.MXEP carries additional regulatory approvals (KC, UL) beyond the primary part. Dimensional variance in length (0.827" vs 0.846") and DC cold resistance (0.029 Ohms vs 0.0312 Ohms) are within acceptable tolerance for cartridge fuse applications and do not affect functional substitution in standard through-hole circuit protection designs. Selection between these parts should be based on availability, lead time, and specific regulatory requirements of the end application.

Frequently Asked Questions (FAQ)

Q: Can 0239004.MXEP be used as a direct replacement for 5TTP 4-R?

A: Yes. Both parts are 4A 125VAC slow-blow glass cartridge fuses with identical electrical ratings, breaking capacity, operating temperature range, and 5mm x 20mm through-hole mounting. They are functionally equivalent for circuit protection applications.

Q: What is the significance of the dimensional difference (0.827" vs 0.846" length)?

A: The 0.019" (0.5mm) length difference falls within standard tolerance for 5x20mm cartridge fuse form factors. This minor variation does not affect mounting compatibility in standard fuse holders or PCB designs.

Q: Are there differences in regulatory approvals between these parts?

A: The 0239004.MXEP carries additional certifications (KC, UL) compared to the 5TTP 4-R (CE, CSA, PSE). Both meet the same core safety standards. Applications requiring specific regional certifications should verify alignment with end-use requirements.

Q: Does the DC cold resistance difference impact performance?

A: The DC cold resistance values (0.029 Ohms vs 0.0312 Ohms) represent normal manufacturing variation within cartridge fuse specifications and do not affect circuit protection performance or thermal characteristics in standard applications.

Q: What is the melting I²t specification used for?

A: Melting I²t characterizes the thermal energy required to melt the fuse element and is used in coordination studies for selective protection in multi-stage circuit designs. Consult application-specific protection coordination requirements if this parameter is critical.