5TTP 250 Equivalent & Substitute Parts

Part Overview

The 5TTP 250 is a 250 mA, 250 V AC/DC slow-blow glass cartridge fuse with a 5mm x 20mm axial form factor, designed for through-hole mounting applications. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and new design implementations. Active alternatives with identical or compatible electrical and mechanical specifications are available from the same manufacturer.

Substiute Parts

5TTP 250

Bel Fuse Inc.In Stock: 8255TTP 250 Datasheet

Current PartRFQ

5TTP 250-R

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

DirectRFQ

5STP 250-R

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5TTP 250 is determined by the following critical parameters:

• Current Rating: 250 mA (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)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

Two substitute parts meet these criteria:

1. 5TTP 250-R (Direct Manufacturer Equivalent): Active product status with identical electrical and mechanical specifications. Represents the direct replacement for the obsolete 5TTP 250.

2. 5STP 250-R (Parametric Equivalent): Active product status with identical current, voltage, fuse type, response time, package, mounting type, and operating temperature. Differs in breaking capacity and melting I²t characteristics.

Parameter Comparison

Engineering Selection Recommendations

5TTP 250-R is the primary substitute for the obsolete 5TTP 250. This part maintains identical electrical and mechanical specifications, including breaking capacity (100A) and melting I²t (0.719), ensuring functional equivalence in existing circuit designs. The 5TTP 250-R carries active product status and meets ROHS3 compliance requirements, addressing regulatory obsolescence concerns associated with the original part.

5STP 250-R serves as a parametric equivalent when breaking capacity and melting I²t characteristics are not circuit-critical constraints. This part offers broader international certification coverage (CCC, CE, CSA, cULus, IMQ, SEMKO, VDE) compared to the 5TTP 250-R, which may be advantageous for applications requiring expanded regional compliance. However, the reduced breaking capacity (35A versus 100A) and lower melting I²t (0.26 versus 0.72) must be evaluated against specific circuit protection requirements.

Selection between 5TTP 250-R and 5STP 250-R depends on whether the application circuit requires the higher breaking capacity and thermal characteristics of the 5TTP series or can operate within the reduced specifications of the 5STP series.

Frequently Asked Questions (FAQ)

Q: Can the 5TTP 250-R be used as a direct replacement for the 5TTP 250?

A: Yes. The 5TTP 250-R maintains identical current rating (250 mA), voltage rating (250 V AC), fuse type (cartridge, glass), response time (slow blow), package dimensions (5mm x 20mm axial), mounting type (through hole), and operating temperature range (-55°C ~ 125°C). Breaking capacity and melting I²t are also equivalent, confirming direct substitution compatibility.

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

A: Both parts share identical current, voltage, fuse type, response time, package, and mounting specifications. The primary differences are: (1) Breaking capacity: 5TTP 250-R provides 100A versus 5STP 250-R at 35A; (2) Melting I²t: 5TTP 250-R is 0.719 versus 5STP 250-R at 0.26; (3) DC cold resistance: 5TTP 250-R is 3.16 Ohms versus 5STP 250-R at 1.9 Ohms; (4) Certification scope: 5STP 250-R carries broader international approvals (CCC, IMQ, SEMKO, VDE in addition to CE, CSA, cULus).

Q: Is the 5STP 250-R suitable for applications originally designed for the 5TTP 250?

A: The 5STP 250-R is mechanically and electrically compatible for basic circuit protection functions. However, applications requiring the higher breaking capacity (100A) or specific thermal response characteristics (melting I²t of 0.72) of the 5TTP series should use the 5TTP 250-R instead.

Q: Are there RoHS compliance differences between these parts?

A: Yes. The 5TTP 250 is RoHS non-compliant. Both substitute parts, 5TTP 250-R and 5STP 250-R, are ROHS3 compliant, addressing regulatory requirements for new designs and systems requiring RoHS certification.

Q: What certifications apply to each part?

A: 5TTP 250 carries CE, CSA, and UL approvals. 5TTP 250-R carries CE, CSA, and cULus approvals. 5STP 250-R carries the broadest certification set: CCC, CE, CSA, cULus, IMQ, SEMKO, and VDE approvals.