SSQC 3 Equivalent & Substitute Parts

Part Overview

The SSQC 3 is a 3A 125VAC/VDC board mount fuse in 2-SMD surface mount package manufactured by Bel Fuse Inc. This component is classified as obsolete, requiring identification of active equivalent parts for new designs and ongoing production support. The obsolete status necessitates sourcing alternative components that maintain electrical and mechanical compatibility with existing circuit requirements.

Substiute Parts

SSQC 3

Bel Fuse Inc.In Stock: 921SSQC 3 Datasheet

Current PartRFQ

0679L3000-01

Bel Fuse Inc.In Stock: 1856280679L3000-01 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SSQC 3 is based on the following critical parameters that must remain constant:

• Current Rating: 3 A (exact match required)
• Voltage Rating: 125 V AC / 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Fuse Type: Board Mount, Surface Mount configuration
• Package: 2-SMD, Square End Block format
• Breaking Capacity: 50 A AC / 300 A DC (exact match required)
• Operating Temperature: -55°C to 125°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

The part 0679L3000-01 meets all critical electrical and mechanical substitution criteria. Both parts share identical current ratings, voltage ratings, response characteristics, breaking capacity, temperature range, and compliance status. Physical dimensions differ slightly, but both conform to the 2-SMD, Square End Block package specification. The substitute part is active and maintains full production availability.

Parameter Comparison

Engineering Selection Recommendations

The 0679L3000-01 is the direct equivalent for the obsolete SSQC 3. Selection is based on:

• Electrical equivalence: Identical current rating, voltage rating, response time, and breaking capacity
• Mechanical compatibility: Both parts conform to 2-SMD, Square End Block surface mount package specification
• Compliance alignment: Both parts maintain ROHS3 compliance and MSL 1 rating
• Production status: The substitute part is active with substantial inventory availability (185,610 pcs), ensuring long-term supply continuity
• Certification advantage: The substitute part carries AEC-Q200 and cURus approvals, providing additional qualification documentation

The DC cold resistance differential (0.028 Ohms vs. 0.026 Ohms) is within acceptable tolerance for this component class and does not affect functional performance in the specified application envelope.

Frequently Asked Questions (FAQ)

Q: Can the 0679L3000-01 directly replace the SSQC 3 in existing designs?

A: Yes. Both parts share identical electrical ratings (3A, 125VAC/VDC, Fast Blow response), breaking capacity (50A AC / 300A DC), and operating temperature range (-55°C to 125°C). Both conform to 2-SMD, Square End Block surface mount package specifications. The substitute part is active and maintains full production support.

Q: What is the difference in physical dimensions between these parts?

A: SSQC 3 dimensions are 0.330" L x 0.128" W x 0.115" H (8.38mm x 3.25mm x 2.92mm). The 0679L3000-01 dimensions are 0.240" L x 0.100" W x 0.110" H (6.10mm x 2.54mm x 2.79mm). Both parts fit the 2-SMD, Square End Block package footprint and are mechanically compatible with standard board mount fuse holders.

Q: Are there compliance or certification differences?

A: The SSQC 3 lists no specific approval agencies. The 0679L3000-01 carries AEC-Q200 and cURus certifications, providing additional qualification documentation for automotive and safety-critical applications.

Q: What is the difference in melting I²t values?

A: The SSQC 3 has a melting I²t of 3, while the 0679L3000-01 has a melting I²t of 1.8. Both values fall within the Fast Blow response classification and maintain identical breaking capacity specifications at rated voltage.

Q: Is the DC cold resistance difference significant?

A: The DC cold resistance values (0.028 Ohms vs. 0.026 Ohms) represent a 7% differential and are within acceptable tolerance for this component class. This difference does not affect functional performance in standard circuit applications.

Q: What packaging options are available for the substitute part?

A: The 0679L3000-01 is supplied in Tape & Reel (TR) format with 185,610 pcs in current inventory, compared to the SSQC 3 Cut Tape (CT) & Digi-Reel packaging with 854 pcs remaining stock.