Littelfuse 04291.75WRM Equivalent & Substitute Parts

Part Overview

The Littelfuse 04291.75WRM is a 1.75A 63VAC/VDC surface mount board mount fuse in 1206 (3216 Metric) package format with fast blow response time. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity. The substitute part maintains identical electrical ratings and mechanical compatibility while offering improved product status and compliance certifications.

Substiute Parts

04291.75WRM

Littelfuse Inc.In Stock: 440004291.75WRM Datasheet

Current PartRFQ

04661.75NR

Littelfuse Inc.In Stock: 501104661.75NR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 04661.75NR qualifies as a direct substitute for the 04291.75WRM based on the following critical parameters:

• Current Rating: Identical at 1.75 A
• Voltage Rating: Identical at 63 VAC / 63 VDC
• Response Time: Identical fast blow characteristic
• Package / Case: Identical 1206 (3216 Metric) surface mount format
• Mounting Type: Identical surface mount configuration
• Fuse Type: Identical board mount (cartridge style excluded)
• Operating Temperature Range: Identical -55°C ~ 90°C

The 04661.75NR belongs to the SlimLine™ 466 series and maintains full electrical and mechanical compatibility with the original 04291.75WRM specification.

Parameter Comparison

Engineering Selection Recommendations

The 04661.75NR is the appropriate substitute for the obsolete 04291.75WRM based on the following factors:

• Active product status ensures ongoing availability and manufacturing support
• ROHS3 compliance meets current environmental and regulatory requirements
• CSA and UL certifications provide third-party approval validation
• Identical electrical and mechanical specifications guarantee direct circuit compatibility
• Tape & Reel packaging supports automated assembly processes

Frequently Asked Questions (FAQ)

Q: Can the 04661.75NR be used as a direct replacement for the 04291.75WRM in existing designs?

A: Yes. Both components share identical current rating (1.75 A), voltage ratings (63 VAC/VDC), response time (fast blow), package format (1206), and operating temperature range (-55°C ~ 90°C). The 04661.75NR is mechanically and electrically compatible for direct substitution.

Q: What is the primary difference between these two fuses?

A: The 04291.75WRM is obsolete with RoHS non-compliant status, while the 04661.75NR is an active product with ROHS3 compliance and CSA/UL certifications. The 04661.75NR also features a reduced height profile (0.023" vs 0.045").

Q: Are there any package or mounting considerations when switching to the 04661.75NR?

A: Both components use identical 1206 (3216 Metric) surface mount packages and mounting types. The 04661.75NR is supplied in Tape & Reel format, which is standard for automated assembly operations.

Q: Does the height difference between the two fuses affect PCB layout?

A: The 04661.75NR has a reduced height of 0.023" compared to the 04291.75WRM at 0.045". This dimensional change does not affect electrical performance and may provide layout advantages in space-constrained applications.

Q: What certifications does the substitute part carry?

A: The 04661.75NR carries CSA and UL approvals, providing independent verification of safety and performance characteristics.