SSQ 8 Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The SSQ 8 is an 8 A, 125 V AC / 86 V DC surface mount board mount fuse manufactured by Bel Fuse Inc. in a 2-SMD, Square End Block package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. The SSQ 8 maintains fast blow response characteristics and operates across the -55°C to 125°C temperature range with ROHS3 compliance and CE, cULus approval certifications.

Substiute Parts

SSQ 8

Bel Fuse Inc.In Stock: 808SSQ 8 Datasheet

Current PartRFQ

0679L8000-01

Bel Fuse Inc.In Stock: 23550679L8000-01 Datasheet

DirectRFQ

0451008.MRL

Littelfuse Inc.In Stock: 604240451008.MRL Datasheet

SimilarRFQ

0453008.MR

Littelfuse Inc.In Stock: 110780453008.MR Datasheet

SimilarRFQ

0476008.MR

Littelfuse Inc.In Stock: 9840476008.MR Datasheet

SimilarRFQ

3404.0020.11

SCHURTER Inc.In Stock: 13353404.0020.11 Datasheet

SimilarRFQ

3404.0020.22

SCHURTER Inc.In Stock: 34223404.0020.22 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SSQ 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)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Fuse Type: Board Mount, Cartridge Style Excluded (exact match required)
• Package / Case: 2-SMD configuration (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)

All identified substitute parts meet or exceed these parameters. Substitute parts are grouped into two categories: direct manufacturer equivalents from Bel Fuse Inc. and cross-manufacturer alternatives from Littelfuse Inc. and SCHURTER Inc.

Parameter Comparison

Engineering Selection Recommendations

Direct Bel Fuse Inc. Equivalent: The 0679L8000-01 is the active direct equivalent from the original manufacturer. This part maintains identical electrical specifications with the exception of increased DC voltage rating (125 V versus 86 V), which provides enhanced margin for DC applications. The 0679L8000-01 carries AEC-Q200 and cURus certifications and is available in Tape & Reel packaging.

Littelfuse Inc. Cross-Manufacturer Alternatives: The 0451008.MRL, 0453008.MR, and 0476008.MR are active Littelfuse NANO²® series alternatives. All three maintain the 8 A / 125 V AC / 125 V DC electrical specification with fast blow response. The 0451008.MRL and 0453008.MR share identical melting I²t values (20.23) and DC cold resistance (0.0077 Ohms), differing only in packaging format. The 0476008.MR exhibits lower melting I²t (9.757) and higher DC cold resistance (0.0112 Ohms), indicating faster response characteristics. All Littelfuse alternatives carry CSA, PSE, and UL certifications.

SCHURTER Inc. Cross-Manufacturer Alternatives: The 3404.0020.11 and 3404.0020.22 are active SCHURTER OMF 125 series alternatives with identical electrical specifications. These parts employ a 2-SMD, J-Lead package configuration rather than Square End Block, which may require PCB footprint verification. Both carry cURus certification and are available in Bulk (3404.0020.11) and Tape & Reel (3404.0020.22) packaging formats.

Frequently Asked Questions (FAQ)

Q: Can the SSQ 8 be directly replaced with the 0679L8000-01? A: Yes. The 0679L8000-01 is the active direct equivalent from Bel Fuse Inc. with identical current rating, AC voltage rating, response time, mounting type, and package configuration. The increased DC voltage rating (125 V versus 86 V) provides additional design margin and does not create compatibility issues.

Q: What is the difference between the Littelfuse 0451008.MRL and 0453008.MR? A: Both parts are electrically identical with 8 A / 125 V AC / 125 V DC specifications and identical melting I²t (20.23) and DC cold resistance (0.0077 Ohms). The primary difference is packaging: 0451008.MRL is supplied in Cut Tape & Digi-Reel format, while 0453008.MR is supplied in Tape & Reel format.

Q: Are the SCHURTER 3404.0020.11 and 3404.0020.22 pin-compatible with the SSQ 8? A: Both SCHURTER parts maintain identical electrical specifications and 2-SMD configuration. However, they employ J-Lead package geometry rather than Square End Block. PCB footprint compatibility must be verified before substitution, as lead configuration differs from the original SSQ 8.

Q: Why does the 0476008.MR have a lower melting I²t value than other substitutes? A: The 0476008.MR exhibits melting I²t of 9.757 compared to 20+ for other alternatives, indicating faster thermal response. This part remains electrically compatible at the 8 A / 125 V specification but exhibits different thermal characteristics. Application-specific thermal requirements should be evaluated.

Q: What certifications apply to each substitute part? A: The 0679L8000-01 carries AEC-Q200 and cURus certifications. Littelfuse alternatives (0451008.MRL, 0453008.MR, 0476008.MR) carry CSA, PSE, and UL certifications. SCHURTER alternatives (3404.0020.11, 3404.0020.22) carry cURus certification. All parts maintain ROHS3 compliance.

Q: Can substitutes be mixed within a single design? A: All identified substitutes meet the core electrical specification (8 A / 125 V AC / Fast Blow / Surface Mount). However, mixing different manufacturers or package geometries (Square End Block versus J-Lead) within a single PCB design may introduce manufacturing complexity. Standardization on a single substitute part number is recommended for production consistency.