5TTP 8 Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The 5TTP 8 is an 8A, 125VAC ceramic cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in 5mm x 20mm form factor. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement. The substitute part maintains identical electrical and mechanical specifications while offering improved compliance status and current inventory availability.

Substiute Parts

5TTP 8

Bel Fuse Inc.In Stock: 8375TTP 8 Datasheet

Current PartRFQ

5TTP 8-R

Bel Fuse Inc.In Stock: 17225TTP 8-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 5TTP 8-R qualifies as a direct substitute for the 5TTP 8 based on the following critical parameters:

• Current Rating: Both parts are rated at 8 A
• Voltage Rating: Both are rated for 125 V AC
• Fuse Type & Response: Both are ceramic cartridge fuses with slow-blow characteristics
• Physical Form Factor: Both use 5mm x 20mm axial package with through-hole mounting
• Breaking Capacity: Both maintain 10kA breaking capacity at rated voltage
• Thermal Range: Both operate across -55°C to 125°C
• Certifications: Both carry CE, CSA, and PSE approvals

The primary distinction between these parts is product status and compliance posture, not functional or electrical performance.

Parameter Comparison

Engineering Selection Recommendations

The 5TTP 8-R is the appropriate selection for new designs and ongoing procurement:

• Active Product Status: The 5TTP 8-R maintains active production status, ensuring long-term availability and supply chain continuity
• RoHS3 Compliance: The substitute part meets ROHS3 compliance requirements, whereas the main part is non-compliant
• Electrical Equivalence: All functional electrical parameters—current rating, voltage rating, breaking capacity, and response characteristics—are identical
• Mechanical Compatibility: The 5mm x 20mm form factor and through-hole mounting are preserved, ensuring direct PCB compatibility
• Certification Parity: Both parts carry identical regulatory approvals (CE, CSA, PSE)

For applications currently using the 5TTP 8, direct replacement with the 5TTP 8-R requires no circuit modifications or re-qualification.

Frequently Asked Questions (FAQ)

Q: Can the 5TTP 8-R be used as a direct replacement for the 5TTP 8 in existing designs?

A: Yes. The 5TTP 8-R is electrically and mechanically equivalent. All critical parameters—current rating, voltage rating, response time, breaking capacity, and physical dimensions—are identical. No circuit modifications are required.

Q: What is the difference between the 5TTP 8 and 5TTP 8-R?

A: The primary differences are product status and compliance. The 5TTP 8 is obsolete and RoHS non-compliant, while the 5TTP 8-R is an active product with ROHS3 compliance. Electrical and mechanical specifications are identical.

Q: Are there any differences in DC cold resistance between these parts?

A: The DC cold resistance values differ slightly (0.01 Ohms for 5TTP 8 versus 0.11 Ohms for 5TTP 8-R). This parameter does not affect fuse operation or substitution suitability for standard circuit protection applications.

Q: What certifications do these fuses carry?

A: Both the 5TTP 8 and 5TTP 8-R carry CE, CSA, and PSE approvals, confirming compliance with international safety standards for circuit protection devices.

Q: Is the 5mm x 20mm form factor standard for both parts?

A: Yes. Both parts use the same 5mm x 20mm axial cartridge form factor with through-hole mounting, ensuring mechanical compatibility with existing PCB designs and fuse holders.

Q: What is the operating temperature range for these fuses?

A: Both parts operate across -55°C to 125°C, providing thermal performance suitable for industrial and consumer electronics applications.