SSQC 5A 125VAC/VDC Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The SSQC 5 is a 5A 125VAC/125VDC board mount surface mount fuse manufactured by Bel Fuse Inc. in a 2-SMD square end block with clip configuration. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications. The fuse provides fast-blow response characteristics suitable for circuit protection in low-voltage AC and DC applications.

Substiute Parts

SSQC 5

Bel Fuse Inc.In Stock: 996SSQC 5 Datasheet

Current PartRFQ

0679L5000-01

Bel Fuse Inc.In Stock: 85240679L5000-01 Datasheet

SimilarRFQ

3404.0017.22

SCHURTER Inc.In Stock: 53473404.0017.22 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SSQC 5 is determined by strict equivalence across the following critical parameters:

• Current Rating: 5 A (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 Configuration: 2-SMD (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

Both substitute parts meet these criteria. Differences in physical dimensions, melting I²t values, DC cold resistance, and breaking capacity do not disqualify substitution when all primary electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

The SSQC 5 is obsolete; therefore, substitution with an active equivalent is necessary for new designs and ongoing procurement.

0679L5000-01 (Bel Fuse Inc., Active): This part maintains manufacturer continuity with the original SSQC 5 and carries AEC-Q200 automotive qualification in addition to cURus certification. It is supplied in Tape & Reel packaging with higher inventory availability (8501 units). The 2-SMD square end block configuration is mechanically compatible with the original part. This option is preferred when maintaining the same manufacturer source is a design requirement.

3404.0017.22 (SCHURTER Inc., Active): This part meets all electrical and mechanical substitution criteria and carries cURus certification. It features a J-Lead package configuration within the 2-SMD form factor. Higher breaking capacity (100A) and lower melting I²t (2.9) provide enhanced protection characteristics. This option is suitable when cross-manufacturer substitution is acceptable and the J-Lead configuration is compatible with existing PCB footprints.

Both substitutes are ROHS3 compliant and operate across the full -55°C to 125°C temperature range. Selection between them depends on PCB layout compatibility (square end block versus J-Lead), required certifications, and supply chain preferences.

Frequently Asked Questions (FAQ)

Q: Can the SSQC 5 be directly replaced with either substitute part?

A: Yes. Both 0679L5000-01 and 3404.0017.22 are electrically and mechanically equivalent to the SSQC 5 across all critical parameters: 5A current rating, 125V AC/DC voltage rating, fast-blow response, surface mount configuration, and 2-SMD package type. The primary consideration is PCB footprint compatibility with the specific lead configuration (square end block with clip versus J-Lead).

Q: What is the difference between the square end block and J-Lead package configurations?

A: Both are 2-SMD surface mount packages. The SSQC 5 and 0679L5000-01 use a square end block with clip design, while the 3404.0017.22 uses a J-Lead configuration. These represent different mechanical mounting styles and require corresponding PCB footprints. Verify your PCB design accommodates the selected lead style before substitution.

Q: Are there compliance or certification differences between the substitutes?

A: The 0679L5000-01 carries both AEC-Q200 and cURus certifications, making it suitable for automotive applications. The 3404.0017.22 carries cURus certification. Both are ROHS3 compliant. Select based on your application's certification requirements.

Q: How do the melting I²t and breaking capacity values affect substitution?

A: The SSQC 5 specifies 8.8 melting I²t and 50A AC / 300A DC breaking capacity. The 0679L5000-01 has 5.5 melting I²t and identical breaking capacity. The 3404.0017.22 has 2.9 melting I²t and 100A breaking capacity. These differences do not prevent substitution when all primary electrical ratings (current, voltage, response time) are identical. The lower melting I²t values in the substitutes indicate faster thermal response, which is acceptable for equivalent circuit protection.

Q: What is the DC cold resistance specification, and does it affect substitution?

A: DC cold resistance measures the fuse element's resistance at room temperature. The SSQC 5 specifies 0.016 Ohms, the 0679L5000-01 specifies 0.014 Ohms, and the 3404.0017.22 does not specify this value. These minor variations do not affect substitution eligibility when all electrical protection parameters are equivalent.

Q: Can I use these parts interchangeably in existing designs?

A: Electrical substitution is direct. Mechanical substitution requires PCB footprint verification. If your design uses a square end block footprint, use either the SSQC 5 (if still available) or the 0679L5000-01. If your design uses a J-Lead footprint, use the 3404.0017.22. Do not attempt to use parts with incompatible lead configurations on existing PCBs without footprint modification.