SSQ 2 /5K Equivalent & Substitute Parts

Part Overview

The SSQ 2 /5K is a 2A 125VAC/VDC surface mount board mount fuse manufactured by Bel Fuse Inc. in a 2-SMD square end block package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical performance across current rating, voltage specifications, and response characteristics while accommodating modern packaging and availability requirements.

Substiute Parts

SSQ 2 /5K

Bel Fuse Inc.In Stock: 635SSQ 2 /5K Datasheet

Current PartRFQ

0679L2000-05

Bel Fuse Inc.In Stock: 282770679L2000-05 Datasheet

DirectRFQ

0476002.MR

Littelfuse Inc.In Stock: 23470476002.MR Datasheet

DirectRFQ

0476002.MRSN

LittelfuseIn Stock: 21100476002.MRSN Datasheet

DirectRFQ

0451002.MRSN

Littelfuse Inc.In Stock: 37710451002.MRSN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters: current rating (2 A), voltage ratings (AC and DC), response time (Fast Blow), mounting type (Surface Mount), fuse type (Board Mount), and package configuration (2-SMD, Square End Block). All substitute parts must maintain these specifications to ensure functional compatibility within the original circuit design.

Direct Substitutes maintain identical electrical and mechanical specifications:

• 0679L2000-05 (Bel Fuse Inc.): Matches all core parameters with active product status
• 0476002.MR and 0476002.MRSN (Littelfuse Inc.): Functionally equivalent with enhanced AC voltage rating (250V AC vs. 125V AC)

Similar Substitute provides functional equivalence with minor specification variance:

• 0451002.MRSN (Littelfuse Inc.): Matches current, AC voltage, and package specifications; DC voltage rating not specified in available data

Parameter Comparison

Engineering Selection Recommendations

0679L2000-05 is the primary direct substitute. Manufactured by Bel Fuse Inc., it maintains identical electrical specifications and package configuration while offering active product status and AEC-Q200 automotive qualification. This part is recommended for applications requiring continuity with the original design specifications.

0476002.MR and 0476002.MRSN are functionally equivalent alternatives from Littelfuse Inc. Both parts provide enhanced AC voltage rating (250V AC) compared to the original specification (125V AC), offering increased design margin in AC applications. These parts are electrically compatible within circuits designed for the SSQ 2 /5K and provide active product availability.

0451002.MRSN is a similar substitute from Littelfuse Inc. with matching current rating, AC voltage rating, and package configuration. This part is suitable for applications where DC voltage specification is not a critical design parameter. Littelfuse NANO²® series certification (CSA, METI, UR) provides regulatory compliance for multiple markets.

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and operating temperature range compatibility with the original component.

Frequently Asked Questions (FAQ)

Q: Can 0679L2000-05 be used as a direct replacement for SSQ 2 /5K? A: Yes. The 0679L2000-05 maintains identical current rating (2A), voltage ratings (125V AC/DC), response time (Fast Blow), mounting type (Surface Mount), and package configuration (2-SMD, Square End Block). Both components are ROHS3 compliant with matching operating temperature range.

Q: What is the difference between 0476002.MR and 0476002.MRSN? A: Both parts are electrically and mechanically identical. The primary difference is packaging: 0476002.MR and 0476002.MRSN are both supplied in Tape & Reel format. Selection between these variants depends on procurement quantity and assembly process requirements.

Q: Can 0476002.MR or 0476002.MRSN be used in place of SSQ 2 /5K? A: Yes, with design consideration. These Littelfuse parts provide enhanced AC voltage rating (250V AC vs. 125V AC), making them suitable for circuits designed for 125V AC operation. The 2A current rating, 125V DC rating, Fast Blow response, and 2-SMD package remain equivalent. The higher AC voltage rating provides additional design margin.

Q: Is 0451002.MRSN compatible with SSQ 2 /5K? A: Functional compatibility exists for applications where DC voltage specification is not critical. The part matches current rating (2A), AC voltage rating (125V), response time (Fast Blow), and package configuration (2-SMD, Square End Block). DC voltage rating is not specified in available documentation for this part.

Q: What certifications should I verify for my application? A: The original SSQ 2 /5K carries CE, CSA, and cULus certifications. Substitute parts carry different certification marks: 0679L2000-05 (AEC-Q200, cURus), 0476002.MR/MRSN (cURus), and 0451002.MRSN (CSA, METI, UR). Verify that the selected substitute meets your application's regulatory requirements.

Q: Are there dimensional differences between these parts? A: Minor dimensional variations exist. SSQ 2 /5K measures 0.240" L × 0.100" W × 0.100" H. Substitute parts measure 0.240" L with width and height ranging from 0.100" to 0.106" (2.54mm to 2.69mm). These variations remain within standard PCB footprint tolerances for 2-SMD packages.