SSQ 375 Equivalent & Substitute Parts

Part Overview

The SSQ 375 is a 375 mA surface mount board mount fuse rated for 125 V AC/DC operation with fast blow response characteristics. Manufactured by Bel Fuse Inc., this component is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active product lines are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Substiute Parts

SSQ 375

Bel Fuse Inc.In Stock: 1021SSQ 375 Datasheet

Current PartRFQ

0679L0375-01

Bel Fuse Inc.In Stock: 9840679L0375-01 Datasheet

DirectRFQ

0451.375MRL

Littelfuse Inc.In Stock: 109410451.375MRL Datasheet

DirectRFQ

0451.375MRSN

LittelfuseIn Stock: 6890451.375MRSN Datasheet

SimilarRFQ

0453.375MR

Littelfuse Inc.In Stock: 190880453.375MR Datasheet

SimilarRFQ

3404.0044.11

SCHURTER Inc.In Stock: 9433404.0044.11 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SSQ 375 are qualified based on the following electrical and mechanical parameters:

• Current Rating: 375 mA (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Fuse Type: Board Mount, Cartridge Style Excluded (exact match required)
• Package / Case: 2-SMD configuration (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

All substitute parts listed meet these core electrical and mechanical criteria. Variations in physical dimensions, DC cold resistance, melting I²t values, breaking capacity, and approval agencies are permitted within the scope of functional equivalence for this product category.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 0451.375MRL (Littelfuse Inc.)

The 0451.375MRL is the preferred substitute for the obsolete SSQ 375. This part is from the active NANO²® 451 product line with current manufacturing status, ensuring long-term availability. It carries CSA and UL approvals, meeting the same regulatory requirements as the original part. Packaging is available in Tape & Reel format, suitable for automated assembly processes. Current inventory levels (10,911 pcs) support immediate procurement.

Secondary Recommendation: 0453.375MR (Littelfuse Inc.)

The 0453.375MR from the NANO²® 453 series is an active product with equivalent electrical specifications. It provides the highest inventory availability (19,040 pcs) and maintains CSA and UL certifications. This part is suitable for applications where the NANO²® 453 series is acceptable within the design framework.

Alternative Recommendation: 0679L0375-01 (Bel Fuse Inc.)

The 0679L0375-01 maintains continuity with the original manufacturer (Bel Fuse Inc.) while transitioning to an active product line. This part carries AEC-Q200 and cURus approvals, providing automotive-grade reliability. It is suitable for designs requiring manufacturer consistency or automotive qualification.

Mechanical Consideration: 3404.0044.11 (SCHURTER Inc.)

The 3404.0044.11 differs in package configuration (J-Lead vs. Square End Block) and is classified as a similar substitute rather than a direct equivalent. This part is suitable only for designs where the J-Lead package footprint is compatible with the PCB layout. Verification of mechanical fit is required before implementation.

Frequently Asked Questions (FAQ)

Q: Can the 0451.375MRL be used as a direct replacement for the SSQ 375 without PCB modification?

A: The 0451.375MRL meets all electrical and thermal specifications for direct functional substitution. However, physical dimensions differ slightly (0.106" W x 0.106" H vs. 0.100" W x 0.100" H). PCB footprint compatibility must be verified. If the original PCB footprint accommodates the slightly larger dimensions, no modification is required.

Q: What is the difference between the 0451.375MRL and 0453.375MR?

A: Both parts are from Littelfuse and meet identical electrical specifications. The primary difference is the product series designation (NANO²® 451 vs. NANO²® 453). Both are active products with equivalent performance characteristics. Selection may be based on inventory availability or design preference.

Q: Why is the 3404.0044.11 listed as a similar substitute rather than a direct equivalent?

A: The 3404.0044.11 uses a J-Lead package configuration instead of the Square End Block package used by the SSQ 375 and other direct substitutes. This mechanical difference requires PCB footprint verification and may necessitate design changes. It is suitable only for applications where the J-Lead package is compatible with existing PCB layouts.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, matching the compliance status of the original SSQ 375.

Q: What approval agencies certify these substitute parts?

A: The primary substitutes (0451.375MRL and 0453.375MR) carry CSA and UL approvals. The 0679L0375-01 carries AEC-Q200 and cURus approvals. The 3404.0044.11 carries cURus approval. All meet recognized safety standards for board mount fuses.

Q: Is packaging format (Tape & Reel vs. Bulk) a factor in substitution?

A: Packaging format does not affect electrical or mechanical equivalence. Selection between Tape & Reel and Bulk packaging depends on production volume and assembly process requirements. Tape & Reel format is standard for automated pick-and-place assembly; Bulk packaging is suitable for manual assembly or lower-volume applications.