Littelfuse 067501.5DRT4P Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 067501.5DRT4P is a 1.5A 250VAC ceramic cartridge fuse with axial through-hole mounting. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing system support and procurement planning. The fuse provides slow-blow response characteristics suitable for applications requiring transient current tolerance before circuit protection activation.

Substiute Parts

067501.5DRT4P

Littelfuse Inc.In Stock: 1095067501.5DRT4P Datasheet

Current PartRFQ

087501.5MRET1P

Littelfuse Inc.In Stock: 903087501.5MRET1P Datasheet

DirectRFQ

067501.5DRT4

Littelfuse Inc.In Stock: 980067501.5DRT4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 067501.5DRT4P is determined by strict equivalence across the following critical parameters:

• Current Rating: 1.5 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 50A (exact match required)

Two substitute parts meet these criteria and are grouped as follows:

Direct Manufacturer Substitute (087501.5MRET1P): Active product status with identical electrical parameters. Differs in packaging format (Tape & Reel), physical dimensions (0.142" Dia x 0.394" L), melting I²t value (4.33 vs. 4.61), and approval certifications (cULus vs. CSA/UL).

Parametric Equivalent (067501.5DRT4): Same series (675) with identical electrical and dimensional specifications. Differs in product status (Active vs. Obsolete) and RoHS compliance status (non-compliant vs. ROHS3 compliant).

Parameter Comparison

Engineering Selection Recommendations

For applications requiring identical physical form factor and electrical characteristics:

The 067501.5DRT4 (parametric equivalent) maintains exact dimensional and electrical specifications as the obsolete 067501.5DRT4P. This part is currently active and carries CSA/UL approval certifications matching the original. Selection of this part requires verification of RoHS compliance requirements, as this variant is non-compliant.

For applications where RoHS3 compliance is mandatory:

The 087501.5MRET1P (direct manufacturer substitute) provides active product status with full ROHS3 compliance. This part differs in physical dimensions (0.142" Dia x 0.394" L versus 0.154" Dia x 0.433" L) and melting I²t characteristic (4.33 versus 4.61). Mechanical fit verification is required before implementation. Packaging is supplied in Tape & Reel format. Approval certification is cULus rather than CSA/UL.

For new designs or systems without legacy constraints:

Either active substitute part is acceptable based on compliance and packaging requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the 087501.5MRET1P be used as a direct drop-in replacement for the 067501.5DRT4P?

A: Electrical parameters are identical (1.5A, 250VAC, 50A breaking capacity, slow-blow response). Physical dimensions differ: the substitute is smaller (0.142" Dia x 0.394" L versus 0.154" Dia x 0.433" L). Mechanical fit in the existing fuse holder must be verified before implementation.

Q: What is the difference between the 067501.5DRT4 and 067501.5DRT4P?

A: Both parts are identical in electrical and dimensional specifications. The primary difference is product status: 067501.5DRT4P is obsolete while 067501.5DRT4 is active. Additionally, 067501.5DRT4P is ROHS3 compliant while 067501.5DRT4 is non-compliant.

Q: Are all three parts electrically equivalent?

A: All three parts share identical current rating (1.5A), voltage rating (250VAC), fuse type (ceramic cartridge), response time (slow-blow), and breaking capacity (50A). DC cold resistance values are equivalent (0.051 Ohms for main and parametric equivalent; 0.0519 Ohms for direct substitute). Melting I²t differs between the parametric equivalent and direct substitute (4.61 versus 4.33).

Q: What packaging formats are available?

A: The 067501.5DRT4P and 067501.5DRT4 are supplied in standard packaging. The 087501.5MRET1P is supplied in Tape & Reel (TR) format, suitable for automated assembly processes.

Q: Which substitute part should be selected for new procurement?

A: Selection depends on application requirements. For identical form factor and CSA/UL certification, use 067501.5DRT4. For RoHS3 compliance and active product status, use 087501.5MRET1P with mechanical fit verification.