SSQ 1.5/5K Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The SSQ 1.5/5K is a 1.5 A, 125 V AC/DC surface mount board mount fuse manufactured by Bel Fuse Inc. in 2-SMD square end block package configuration. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for this fuse category.

Substiute Parts

SSQ 1.5/5K

Bel Fuse Inc.In Stock: 1711SSQ 1.5/5K Datasheet

Current PartRFQ

0679L1500-05

Bel Fuse Inc.In Stock: 116260679L1500-05 Datasheet

DirectRFQ

SSQ 1.5

Bel Fuse Inc.In Stock: 1308SSQ 1.5 Datasheet

Parametric EquivalentRFQ

045101.5MRSN

Littelfuse Inc.In Stock: 1218045101.5MRSN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SSQ 1.5/5K is determined by the following critical parameters:

• Current Rating: 1.5 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)
• Package / Case: 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)

Acceptable parameter variations within substitute classification include minor differences in melting I²t, DC cold resistance, physical dimensions (within 0.010" tolerance), breaking capacity, and approval agency certifications, provided all critical parameters remain identical.

Parameter Comparison

Engineering Selection Recommendations

0679L1500-05 (Direct Manufacturer Substitute): This part is the primary recommended substitute. Manufactured by Bel Fuse Inc., it maintains all critical electrical parameters identical to the SSQ 1.5/5K. The part carries active product status with higher inventory availability (11,531 units). Physical height dimension increases by 0.25 mm (2.79 mm vs. 2.54 mm), and melting I²t is reduced to 0.29. Approval certifications include AEC-Q200 and cURus. This part is suitable for direct replacement in new designs and production continuity.

SSQ 1.5 (Parametric Equivalent): This part is an exact parametric equivalent with identical electrical and mechanical specifications to the main part. Both are manufactured by Bel Fuse Inc. and share obsolete product status. This part should be considered only when 0679L1500-05 is unavailable, as it does not resolve the obsolescence issue.

045101.5MRSN (Similar Substitute - Cross-Manufacturer): This Littelfuse Inc. NANO²® 451 series part meets all critical electrical parameters with identical current rating, voltage rating, response time, and mounting configuration. Physical dimensions vary slightly (2.69 x 2.69 mm vs. 2.54 x 2.54 mm), and melting I²t is higher at 0.853. DC voltage rating is not specified in available documentation. The part carries active product status with CSA and UR certifications. This part is suitable as a secondary substitute when Bel Fuse options are unavailable.

Frequently Asked Questions (FAQ)

Q: Can the 0679L1500-05 be used as a direct replacement for SSQ 1.5/5K?

A: Yes. The 0679L1500-05 maintains all critical electrical specifications: 1.5 A current rating, 125 V AC/DC voltage rating, fast blow response, surface mount configuration, and 2-SMD square end block package. Physical height increases by 0.25 mm. Verify PCB layout clearance before implementation.

Q: What is the difference between the SSQ 1.5 and 0679L1500-05?

A: Both are manufactured by Bel Fuse Inc. with identical electrical parameters. The SSQ 1.5 uses Cut Tape & Digi-Reel® packaging, while 0679L1500-05 uses Tape & Reel packaging. The SSQ 1.5 has melting I²t of 0.57 compared to 0.29 for 0679L1500-05. Both are obsolete and active status respectively.

Q: Is the Littelfuse 045101.5MRSN compatible with the SSQ 1.5/5K?

A: The 045101.5MRSN meets all critical electrical parameters and is mechanically compatible. Physical dimensions vary by approximately 0.15 mm in width and height. DC voltage rating is not specified in available documentation. Verify application requirements before selection.

Q: What packaging options are available for these substitutes?

A: The 0679L1500-05 is supplied in Tape & Reel (TR) packaging. The SSQ 1.5 is available in Cut Tape (CT) & Digi-Reel® packaging. The 045101.5MRSN is supplied in Tape & Reel (TR) packaging. Confirm packaging requirements with procurement specifications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of melting I²t differences?

A: Melting I²t indicates thermal energy required to melt the fuse element. The SSQ 1.5/5K has I²t of 0.57, while 0679L1500-05 has 0.29 and 045101.5MRSN has 0.853. These variations affect response characteristics under fault conditions. Verify circuit protection requirements before substitution.