SSQ 7 Equivalent & Substitute Parts Reference

Part Overview

The SSQ 7 is a 7A 125VAC/VDC surface mount board mount fuse manufactured by Bel Fuse Inc. in 2-SMD Square End Block package configuration. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Substitute parts must maintain electrical equivalence across current rating, voltage rating, response time, and mechanical compatibility to ensure proper circuit protection without redesign.

Key Parameters

Parameter	SSQ 7 Specification
Current Rating	7 A
Voltage Rating AC	125 V
Voltage Rating DC	125 V
Response Time	Fast Blow
Mounting Type	Surface Mount
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	2-SMD, Square End Block
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the SSQ 7 is determined by strict equivalence across the following parameters:

Current Rating: Must be 7 A
Voltage Rating: Must support 125 V AC and 125 V DC minimum
Response Time: Must be Fast Blow
Mounting Type: Must be Surface Mount
Package Configuration: Must be 2-SMD with compatible footprint dimensions
Operating Temperature: Must support -55°C ~ 125°C range
RoHS Compliance: Must be ROHS3 Compliant

Substitute parts are grouped into two categories: Direct Substitutes (identical electrical and mechanical specifications) and Similar Substitutes (equivalent electrical performance with minor dimensional or certification variations).

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Package	Size L x W x H (mm)	DC Cold Resistance (Ω)	Product Status	Packaging Type
SSQ 7	Bel Fuse Inc.	7	125	125	Fast Blow	2-SMD, Square End Block	6.10 x 2.54 x 2.54	0.009	Obsolete	Cut Tape (CT) & Digi-Reel®
0679L7000-01	Bel Fuse Inc.	7	125	125	Fast Blow	2-SMD, Square End Block	6.10 x 2.54 x 2.79	0.01	Active	Tape & Reel (TR)
0476007.MR	Littelfuse Inc.	7	125	125	Fast Blow	2-SMD, Square End Block	6.10 x 2.69 x 2.69	0.0116	Active	Tape & Reel (TR)
0476007.MRSN	Littelfuse Inc.	7	125	125	Fast Blow	2-SMD, Square End Block	6.10 x 2.69 x 2.69	0.0116	Active	Tape & Reel (TR)
0451007.MRL	Littelfuse Inc.	7	125	125	Fast Blow	2-SMD, Square End Block	6.10 x 2.69 x 2.69	0.009	Active	Cut Tape (CT) & Digi-Reel®
0451007.MRSN	Littelfuse Inc.	7	125	Fast Blow	2-SMD, Square End Block	6.10 x 2.69 x 2.69	0.009	Active	Tape & Reel (TR)
0453007.MR	Littelfuse Inc.	7	125	125	Fast Blow	2-SMD, Square End Block	6.10 x 2.69 x 2.69	0.009	Active	Cut Tape (CT) & Digi-Reel®
3404.0019.11	SCHURTER Inc.	7	125	125	Fast Blow	2-SMD, J-Lead	7.40 x 3.10 x 2.60	Not Specified	Active	Bulk

Engineering Selection Recommendations

Primary Recommendation: 0679L7000-01 (Bel Fuse Inc.)

The 0679L7000-01 is the direct successor from the original manufacturer. It maintains identical electrical specifications (7A, 125VAC/VDC, Fast Blow) and is currently in active production status. This part carries AEC-Q200 automotive qualification and cURus certification, providing the highest compatibility assurance for SSQ 7 replacement applications.

Secondary Recommendations: 0476007.MR and 0476007.MRSN (Littelfuse Inc.)

Both NANO²®476 variants meet all electrical requirements and are actively produced. The 0476007.MRSN variant carries REACH Unaffected status, making it suitable for applications with REACH compliance requirements. Dimensional variation (2.69mm width and height versus 2.54mm) requires PCB footprint verification before implementation.

Alternative Options: 0451007.MRL, 0451007.MRSN, 0453007.MR (Littelfuse Inc.)

These NANO²® series parts (451 and 453) provide electrical equivalence with identical DC cold resistance (0.009Ω) matching the original SSQ 7. Packaging availability differs: 0451007.MRL and 0453007.MR are available in Cut Tape format; 0451007.MRSN is supplied in Tape & Reel. All three are actively produced with ROHS3 compliance and REACH Unaffected status.

Compatibility Note: 3404.0019.11 (SCHURTER Inc.)

The SCHURTER OMF 125 series part meets electrical specifications but uses J-Lead package configuration instead of Square End Block. Dimensional differences (7.40mm length, 3.10mm width) require PCB redesign and are not recommended as direct drop-in replacements without layout modification.

Frequently Asked Questions (FAQ)

Q: Can SSQ 7 be directly replaced with 0679L7000-01?

A: Yes. The 0679L7000-01 maintains identical electrical specifications (7A, 125VAC/VDC, Fast Blow response) and is the active production equivalent from Bel Fuse Inc. Height dimension increases from 2.54mm to 2.79mm; verify PCB clearance before implementation.

Q: What is the difference between 0476007.MR and 0476007.MRSN?

A: Both parts are electrically identical NANO²®476 fuses with 7A, 125VAC/VDC ratings. The primary difference is REACH status: 0476007.MR is REACH Affected; 0476007.MRSN is REACH Unaffected. Select based on supply chain compliance requirements.

Q: Are Littelfuse NANO²® series parts compatible with SSQ 7 footprints?

A: Littelfuse NANO²® parts have slightly larger dimensions (2.69mm width and height versus 2.54mm for SSQ 7). Verify PCB footprint tolerance and clearance specifications. All maintain identical electrical performance and Fast Blow response characteristics.

Q: Why is 3404.0019.11 listed as a similar substitute rather than direct substitute?

A: The SCHURTER 3404.0019.11 uses J-Lead package configuration instead of Square End Block. While electrical specifications match (7A, 125VAC/VDC, Fast Blow), the different lead style and larger overall dimensions (7.40mm x 3.10mm) require PCB layout modification and are not suitable for direct footprint replacement.

Q: Which substitute part has the best availability?

A: 0451007.MRL (Littelfuse NANO²® 451) has the highest inventory level at 40,200 pieces. For active production applications requiring immediate availability, this part provides both electrical equivalence and supply security.

Q: Do all substitute parts maintain the same operating temperature range?

A: Yes. All listed substitute parts operate across the -55°C ~ 125°C temperature range, matching the original SSQ 7 specification.

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