SSQC 250 Equivalent & Substitute Parts

Part Overview

The SSQC 250 is a 250 mA, 125 V AC/DC surface mount board mount fuse manufactured by Bel Fuse Inc. in a 2-SMD square end block with clip package. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. The fast blow response time and compact SMD form factor make this fuse suitable for circuit protection in low-current applications requiring space-constrained mounting solutions.

Substiute Parts

SSQC 250

Bel Fuse Inc.In Stock: 1183SSQC 250 Datasheet

Current PartRFQ

3404.0006.22

SCHURTER Inc.In Stock: 19183404.0006.22 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SSQC 250 is determined by matching the following critical parameters:

• Current Rating: 250 mA (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (both must be met or exceeded)
• Response Time: Fast Blow (functional requirement for circuit protection timing)
• Mounting Type: Surface Mount (physical installation requirement)
• Fuse Type: Board Mount, cartridge style excluded (form factor constraint)
• Operating Temperature Range: -55°C to 125°C (environmental compatibility)
• RoHS Compliance: ROHS3 Compliant (regulatory requirement)

The substitute part 3404.0006.22 (SCHURTER OMF 125 series) meets all these criteria with identical current and voltage ratings, matching response time, surface mount configuration, and equivalent environmental specifications.

Parameter Comparison

Engineering Selection Recommendations

The SCHURTER 3404.0006.22 is the qualified substitute for the obsolete SSQC 250. Both parts maintain identical electrical specifications across current, voltage, and response time parameters. The SCHURTER part carries active product status with cURus approval certification, ensuring ongoing availability and regulatory compliance. Both components are ROHS3 compliant and REACH unaffected, meeting current environmental and safety standards. The substitute part features a higher breaking capacity (100A versus 50A AC/300A DC) and lower melting I²t value (0.0058 versus 0.02), providing enhanced protection characteristics. Package differences exist in lead configuration (J-Lead versus square end block with clip), requiring mechanical validation during board redesign.

Frequently Asked Questions (FAQ)

Q: Can the SCHURTER 3404.0006.22 be used as a direct replacement for the SSQC 250?

A: Electrical substitution is valid based on matching current rating (250 mA), voltage ratings (125 V AC/DC), and response time (fast blow). Physical substitution requires board layout modification due to package differences: the SCHURTER uses J-Lead configuration while the SSQC uses a square end block with clip. Mechanical compatibility must be assessed during redesign.

Q: What are the key differences between these two fuses?

A: The primary differences are product status (SSQC 250 is obsolete; 3404.0006.22 is active), package configuration (square end block with clip versus J-Lead), breaking capacity (50A AC/300A DC versus 100A), and melting I²t characteristics (0.02 versus 0.0058). Electrical performance parameters are identical.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both the SSQC 250 and 3404.0006.22 are ROHS3 compliant and REACH unaffected, meeting current environmental and safety regulations.

Q: What is the significance of the melting I²t difference?

A: The melting I²t value (0.0058 for SCHURTER versus 0.02 for Bel Fuse) indicates the thermal energy required to melt the fuse element. The lower value in the SCHURTER part means it responds more quickly to overcurrent conditions, providing faster circuit protection.

Q: Does the higher breaking capacity of the substitute part affect circuit protection?

A: Breaking capacity defines the maximum current the fuse can safely interrupt without damage. The SCHURTER part's higher breaking capacity (100A) provides enhanced safety margin and does not negatively affect protection of circuits designed for 250 mA operation.

Q: What packaging format is the SCHURTER part supplied in?

A: The SCHURTER 3404.0006.22 is supplied in Tape & Reel (TR) format, suitable for automated assembly processes.