SSQ 750/5K Equivalent & Substitute Parts

Part Overview

The SSQ 750/5K is a 750 mA surface mount board mount fuse rated for 125 V AC/DC operation, manufactured by Bel Fuse Inc. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The SSQ series fuse provides fast-blow response characteristics suitable for circuit protection applications requiring SMD packaging in a 2-SMD square end block configuration.

Substiute Parts

SSQ 750/5K

Bel Fuse Inc.In Stock: 1055SSQ 750/5K Datasheet

Current PartRFQ

0679L0750-05

Bel Fuse Inc.In Stock: 150520679L0750-05 Datasheet

DirectRFQ

0451.750MRSN

Littelfuse Inc.In Stock: 79010451.750MRSN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SSQ 750/5K are qualified based on the following critical parameters:

• Current Rating: 750 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)
• Package Configuration: 2-SMD, Square End Block (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

The identified substitute parts meet all critical electrical and mechanical parameters. Variations in melting I²t, DC cold resistance, and dimensional tolerances within the 2-SMD square end block envelope are acceptable within industry standards for this fuse category.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are classified as active products with current manufacturing availability, addressing the obsolescence status of the SSQ 750/5K.

The 0679L0750-05 (Bel Fuse Inc.) maintains manufacturer continuity and is certified to AEC-Q200 and cURus standards. This part is supplied in Tape & Reel packaging with 14,971 units in stock.

The 0451.750MRSN (Littelfuse Inc., NANO²® 451 series) provides an alternative from a major fuse manufacturer with CSA and UR certifications. This part is supplied in Cut Tape packaging with 7,866 units in stock.

Both parts satisfy the core electrical requirements: 750 mA current rating, 125 V AC operation, fast-blow response, and surface mount 2-SMD square end block configuration. Selection between these substitutes depends on supply chain requirements, packaging format preference, and certification requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the 0679L0750-05 be used as a direct replacement for SSQ 750/5K?

A: Yes. The 0679L0750-05 matches all critical electrical parameters: 750 mA current rating, 125 V AC/DC voltage rating, fast-blow response, and 2-SMD square end block package. Dimensional variation in height (2.79 mm vs. 2.54 mm) is within acceptable tolerance for surface mount applications.

Q: What is the difference between the two substitute parts?

A: Both parts meet the core electrical specifications. The 0679L0750-05 is from Bel Fuse Inc. with AEC-Q200 certification and higher melting I²t (0.26). The 0451.750MRSN is from Littelfuse Inc. with lower melting I²t (0.185) and slightly higher DC cold resistance (0.245 Ohms). Dimensional differences are minor within the 2-SMD square end block standard.

Q: Are packaging format differences significant?

A: The 0679L0750-05 is supplied in Tape & Reel format; the 0451.750MRSN is supplied in Cut Tape format. Selection depends on assembly line requirements and volume needs. Both formats are standard for SMD fuse applications.

Q: Do both substitutes meet RoHS compliance?

A: Yes. Both the 0679L0750-05 and 0451.750MRSN are ROHS3 compliant and REACH unaffected, matching the compliance status of the SSQ 750/5K.

Q: What certifications apply to each substitute?

A: The 0679L0750-05 carries AEC-Q200 and cURus certifications. The 0451.750MRSN carries CSA and UR certifications. Both meet industry standards for board mount fuses in this current and voltage class.