5TTP 250-R Equivalent & Substitute Parts

Part Overview

The 5TTP 250-R is a 250 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm (axial) through-hole package, manufactured by Bel Fuse Inc. This component is actively produced and widely used in circuit protection applications requiring reliable overcurrent protection with delayed response characteristics. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained, ensuring direct functional replacement without circuit redesign.

Substiute Parts

5TTP 250-R

Bel Fuse Inc.In Stock: 18425TTP 250-R Datasheet

Current PartRFQ

5STP 250-R

Bel Fuse Inc.In Stock: 13475STP 250-R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The 5STP 250-R qualifies as a parametric equivalent based on the following critical parameters:

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

Both parts maintain identical electrical and mechanical specifications, permitting direct substitution in applications where the 5TTP 250-R is specified.

Parameter Comparison

Engineering Selection Recommendations

Both the 5TTP 250-R and 5STP 250-R are active products from Bel Fuse Inc. with identical primary electrical and mechanical specifications. The 5STP 250-R carries broader regulatory approvals (CCC, IMQ, SEMKO, VDE in addition to CE, CSA, cULus), making it suitable for applications requiring expanded international compliance. The 5TTP 250-R provides higher breaking capacity (100A vs. 35A) and higher melting I²t (0.719 vs. 0.26), which may be relevant for specific circuit protection requirements. Selection between these parts should be based on application-specific breaking capacity and regulatory certification requirements.

Frequently Asked Questions (FAQ)

Q: Can the 5STP 250-R directly replace the 5TTP 250-R in existing designs?

A: Yes. Both parts share identical current rating (250 mA), voltage rating (250 V AC), response time (slow blow), package dimensions (5mm x 20mm axial), and mounting type (through hole). Direct substitution is mechanically and electrically compatible.

Q: What is the difference between the 5TTP 250-R and 5STP 250-R?

A: The primary differences are breaking capacity (5TTP: 100A vs. 5STP: 35A), melting I²t (5TTP: 0.719 vs. 5STP: 0.26), DC cold resistance (5TTP: 3.16 Ohms vs. 5STP: 1.9 Ohms), and regulatory approvals. Both maintain identical functional parameters for standard circuit protection applications.

Q: Are both parts RoHS compliant?

A: Yes. Both the 5TTP 250-R and 5STP 250-R are ROHS3 compliant.

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

A: Both parts operate across -55°C to 125°C.

Q: Which part has broader international certifications?

A: The 5STP 250-R carries additional approvals including CCC, IMQ, SEMKO, and VDE, in addition to CE, CSA, and cULus certifications held by both parts.