5TTP 3-R Equivalent & Substitute Parts

Part Overview

The 5TTP 3-R is a 3A 250VAC glass cartridge fuse manufactured by Bel Fuse Inc., designed for through-hole mounting in 5mm x 20mm form factor applications. This slow-blow fuse is actively produced and widely used in industrial and consumer electronics for circuit protection. Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, ensuring functional interchangeability in the target application.

Substiute Parts

5TTP 3-R

Bel Fuse Inc.In Stock: 14355TTP 3-R Datasheet

Current PartRFQ

0239003.HXEP

Littelfuse Inc.In Stock: 10460239003.HXEP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5TTP 3-R is determined by strict alignment of the following parameters:

• Current Rating: 3 A (exact match required)
• Voltage Rating (AC): 250 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: 100 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)

The substitute part 0239003.HXEP (Littelfuse Inc., Series 239) meets all mandatory electrical and mechanical parameters for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

The 0239003.HXEP from Littelfuse Inc. is a direct electrical and mechanical equivalent to the 5TTP 3-R. Both parts are actively produced and carry ROHS3 compliance. The substitute part carries additional regulatory approvals (KC, UL) beyond the original specification. Physical dimensions differ marginally (0.019" length difference), which remains within typical through-hole PCB tolerance specifications. Both parts satisfy identical electrical performance criteria for 3A 250VAC slow-blow cartridge fuse applications.

Frequently Asked Questions (FAQ)

Q: Can the 0239003.HXEP replace the 5TTP 3-R in existing designs?

A: Yes. Both parts share identical electrical ratings (3A, 250VAC), fuse type (cartridge, glass), response characteristic (slow blow), package dimensions (5mm x 20mm), and mounting method (through hole). The 0.019" length difference is within standard PCB hole tolerance.

Q: Are there differences in approval certifications?

A: The 0239003.HXEP carries CE, CSA, KC, PSE, and UL approvals. The 5TTP 3-R carries CE, CSA, cULus, and PSE approvals. Both meet the same core safety standards for this product category.

Q: What is the significance of the DC Cold Resistance difference?

A: The DC Cold Resistance values (0.043 Ohms vs. 0.04877 Ohms) are within acceptable tolerance for slow-blow cartridge fuses and do not affect functional interchangeability in standard circuit protection applications.

Q: Are both parts currently available?

A: Yes. The 5TTP 3-R has 1412 pieces in stock. The 0239003.HXEP has 1014 pieces in stock.

Q: What is the Melting I²t specification used for?

A: Melting I²t defines the thermal energy required to melt the fuse element. While the values differ (55.6 vs. 129.51), both parts maintain identical current ratings and response times, confirming their equivalence for the specified 3A slow-blow application.