SSQC 8 Equivalent & Substitute Parts

Part Overview

The SSQC 8 is an 8A 125VAC/86VDC surface mount board 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 functionally equivalent alternatives necessary for ongoing design support and procurement planning. The part operates across a temperature range of -55°C to 125°C with fast blow response characteristics and is RoHS3 compliant.

Substiute Parts

SSQC 8

Bel Fuse Inc.In Stock: 997SSQC 8 Datasheet

Current PartRFQ

3404.0020.22

SCHURTER Inc.In Stock: 34223404.0020.22 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SSQC 8 is determined by the following critical parameters:

• Current Rating: 8 A (exact match required)
• Voltage Rating - AC: 125 V (exact match required)
• Voltage Rating - DC: Minimum 86 V (equal or higher acceptable)
• Fuse Type: Board Mount, Surface Mount configuration
• Response Time: Fast Blow
• Operating Temperature Range: -55°C to 125°C (minimum requirement)
• Package Configuration: 2-SMD surface mount with mechanical compatibility

The substitute part 3404.0020.22 (SCHURTER Inc., OMF 125 series) meets all critical substitution criteria. It maintains identical current and AC voltage ratings, exceeds the DC voltage requirement (125V vs. 86V), operates within the same temperature range, and provides equivalent fast blow response characteristics in a compatible 2-SMD surface mount package.

Parameter Comparison

Engineering Selection Recommendations

The 3404.0020.22 (SCHURTER Inc.) is the qualified substitute for the obsolete SSQC 8. Selection is based on the following engineering criteria:

• Electrical equivalence: Identical current and AC voltage ratings with superior DC voltage capability (125V vs. 86V)
• Thermal compatibility: Matching operating temperature range (-55°C to 125°C)
• Regulatory compliance: Both parts are RoHS3 compliant and REACH unaffected
• Product availability: The substitute is active production status with 3350 units in stock, compared to the obsolete SSQC 8
• Certification: The substitute carries cURus approval, providing recognized safety certification

The primary design consideration is the package configuration difference: the SSQC 8 uses a square end block with clip, while the 3404.0020.22 uses a J-Lead configuration. Mechanical compatibility with the existing fuse holder must be verified during integration.

Frequently Asked Questions (FAQ)

Q: Can the 3404.0020.22 directly replace the SSQC 8 in existing designs?

A: Electrical substitution is valid based on current, voltage, and response time parameters. However, the package configuration differs (square end block with clip vs. J-Lead). Mechanical compatibility with the existing fuse holder assembly must be confirmed before implementation.

Q: Why is the DC voltage rating higher on the substitute part?

A: The 3404.0020.22 is rated for 125V DC compared to the SSQC 8's 86V DC. A higher voltage rating does not create incompatibility; it indicates the substitute can operate safely in applications requiring up to 125V DC, exceeding the original specification.

Q: What is the significance of the different melting I²t values?

A: The SSQC 8 has a melting I²t of 26, while the 3404.0020.22 has 20. This parameter affects thermal response characteristics. The lower value on the substitute indicates slightly faster thermal response, which is acceptable for fast blow fuse applications and does not compromise circuit protection.

Q: Are there compliance differences between the two parts?

A: Both parts are RoHS3 compliant and REACH unaffected. The substitute carries cURus certification, providing recognized safety approval. No compliance barriers exist for substitution.

Q: What is the impact of the higher breaking capacity on the substitute?

A: The 3404.0020.22 has a breaking capacity of 100A compared to the SSQC 8's 50A AC/10kA DC. Higher breaking capacity indicates enhanced fault current handling capability, which is a beneficial characteristic and does not create incompatibility.