SSQ 1.6/1K Equivalent & Substitute Parts

Part Overview

The SSQ 1.6/1K is a 1.6 A surface mount board mount fuse manufactured by Bel Fuse Inc., rated for 125 V AC and 125 V DC operation. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and procurement planning. The SSQ series fuse is designed for fast-blow response characteristics in 2-SMD square end block package configuration, suitable for applications requiring reliable overcurrent protection in compact form factors.

Substiute Parts

SSQ 1.6/1K

Bel Fuse Inc.In Stock: 1114SSQ 1.6/1K Datasheet

Current PartRFQ

047601.6MR

Littelfuse Inc.In Stock: 1696047601.6MR Datasheet

DirectRFQ

047601.6MRSN

Littelfuse Inc.In Stock: 1009047601.6MRSN Datasheet

DirectRFQ

045101.6MRSN

Littelfuse Inc.In Stock: 1050045101.6MRSN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SSQ 1.6/1K are classified into two categories based on electrical parameter compatibility:

Direct Substitutes (NANO²®476 Series): Parts 047601.6MR and 047601.6MRSN maintain the 1.6 A current rating and 125 V DC voltage rating. These parts increase AC voltage rating to 250 V, providing enhanced overvoltage margin while preserving the core protection characteristics. Both parts share identical electrical specifications and differ only in packaging designation (standard tape & reel versus specified tape & reel variant).

Similar Substitute (NANO²®451 Series): Part 045101.6MRSN maintains the 1.6 A current rating and 125 V AC/DC voltage ratings, matching the original SSQ 1.6/1K electrical envelope. This part represents a functional equivalent with identical voltage and current protection thresholds.

Key Parameters Determining Substitution:

• Current Rating: 1.6 A (mandatory match)
• Voltage Rating - AC: 125 V minimum
• Voltage Rating - DC: 125 V (mandatory match)
• Response Time: Fast Blow
• Mounting Type: Surface Mount
• Package / Case: 2-SMD, Square End Block
• Operating Temperature Range: -55°C ~ 125°C

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): Parts 047601.6MR and 047601.6MRSN from the Littelfuse NANO²®476 series provide the most direct substitution path. Both parts maintain identical electrical protection characteristics while offering enhanced AC voltage rating (250 V versus 125 V). These parts carry active product status with cURus certification and are currently in stock inventory. The NANO²®476 series represents the current generation equivalent to the obsolete SSQ 1.6/1K.

For Functional Equivalence: Part 045101.6MRSN from the Littelfuse NANO²®451 series provides electrical parameter matching at the original voltage envelope (125 V AC/DC). This part maintains active product status with CSA and UR certifications. Selection of this part is appropriate when AC voltage margin enhancement is not required by system design.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), matching the original component environmental specifications. Operating temperature range remains consistent across all options (-55°C ~ 125°C).

Frequently Asked Questions (FAQ)

Q: Can 047601.6MR and 047601.6MRSN be used interchangeably? A: Yes. Both parts share identical electrical specifications (1.6 A, 250 V AC, 125 V DC, fast-blow response). The designation difference reflects packaging variant classification only. Both are suitable for direct substitution of the SSQ 1.6/1K.

Q: What is the primary difference between the NANO²®476 and NANO²®451 series substitutes? A: The NANO²®476 series (047601.6MR, 047601.6MRSN) provides 250 V AC rating, while the NANO²®451 series (045101.6MRSN) maintains the original 125 V AC rating. Both deliver 1.6 A protection at 125 V DC. Selection depends on system AC voltage requirements.

Q: Are there physical compatibility concerns with the substitute parts? A: The substitute parts have slightly larger cross-sectional dimensions (0.106" W x 0.106" H versus 0.100" W x 0.100" H for the original). Length remains constant at 0.240". Verify PCB footprint and component spacing accommodate the minor dimensional increase before implementation.

Q: Do all substitute parts carry the same certifications as the original SSQ 1.6/1K? A: No. The original part carries CE, CSA, and cULus certifications. The NANO²®476 series carries cURus certification. The NANO²®451 series carries CSA and UR certifications. Verify that substitute part certifications meet system regulatory requirements.

Q: What is the inventory status for these substitute parts? A: 047601.6MR: 1653 pcs in stock; 047601.6MRSN: 933 pcs in stock; 045101.6MRSN: 1021 pcs in stock. All substitute parts are currently available.