SSQ 315/1K Equivalent & Substitute Parts

Part Overview

The SSQ 315/1K is a 315 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 identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity. The fast blow response time and 2-SMD square end block package are critical functional characteristics for applications requiring this specific fuse performance profile.

Substiute Parts

SSQ 315/1K

Bel Fuse Inc.In Stock: 1019SSQ 315/1K Datasheet

Current PartRFQ

0451.315MRSN

Littelfuse Inc.In Stock: 10840451.315MRSN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SSQ 315/1K is determined by strict equivalence across the following parameters: current rating (315 mA), AC voltage rating (125 V), response time classification (fast blow), mounting type (surface mount), and package configuration (2-SMD square end block). The substitute part 0451.315MRSN manufactured by Littelfuse Inc. meets all these core electrical and mechanical requirements. Dimensional tolerance variations within the 2-SMD square end block standard (0.240" L × 0.100–0.106" W × 0.100–0.106" H) are acceptable for board-level compatibility. Breaking capacity and thermal operating range alignment further confirm functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The 0451.315MRSN from Littelfuse Inc. is the qualified substitute for the obsolete SSQ 315/1K. Both components carry ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The Littelfuse part maintains active product status, providing long-term availability and supply chain stability. Dimensional variations within the 2-SMD square end block standard are within acceptable tolerance for PCB footprint compatibility. The substitute part carries CSA and UR approvals, compared to the original part's CE, CSA, and cULus certifications; CSA approval is common to both, confirming safety standard equivalence for this application class.

Frequently Asked Questions (FAQ)

Q: Can the 0451.315MRSN be used as a direct replacement for the SSQ 315/1K?

A: Yes. Both parts share identical current rating (315 mA), AC/DC voltage ratings (125 V), response time (fast blow), mounting type (surface mount), and package configuration (2-SMD square end block). Electrical and mechanical compatibility is confirmed.

Q: Are there dimensional differences between these parts?

A: Minor dimensional variations exist within the 2-SMD square end block standard. The SSQ 315/1K measures 0.240" L × 0.100" W × 0.100" H, while the 0451.315MRSN measures 0.240" L × 0.106" W × 0.106" H. These variations remain within acceptable tolerance for standard PCB footprints designed for this package type.

Q: What is the difference in packaging between these parts?

A: The SSQ 315/1K is supplied in standard packaging, while the 0451.315MRSN is supplied in Tape & Reel (TR) format. Both are suitable for automated assembly processes; tape and reel packaging is standard for high-volume surface mount production.

Q: Are regulatory certifications equivalent?

A: Both parts are ROHS3 compliant and REACH unaffected. The SSQ 315/1K carries CE, CSA, and cULus approvals. The 0451.315MRSN carries CSA and UR approvals. CSA certification is common to both, confirming safety standard alignment for this fuse category.

Q: Why is the SSQ 315/1K listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The 0451.315MRSN provides functional continuity for applications currently using or specifying the SSQ 315/1K, with active product status ensuring ongoing availability.