NANOSMD550LR-2 Equivalent & Substitute Parts

Part Overview

The NANOSMD550LR-2 is a PTC resettable fuse rated for 6V at 5.5A in a 1206 surface mount package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and procurement needs. The substitute part maintains functional compatibility within the specified electrical and mechanical parameters while offering improved availability and current product status.

Substiute Parts

NANOSMD550LR-2

Littelfuse Inc.In Stock: 1055NANOSMD550LR-2 Datasheet

Current PartRFQ

1206L600SLWR

Littelfuse Inc.In Stock: 142451206L600SLWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The substitute part 1206L600SLWR is qualified as a direct equivalent based on the following substitution criteria:

Matching Parameters:

• Identical voltage rating: 6V maximum
• Identical package form factor: 1206 (3216 Metric) surface mount
• Identical mounting type: Surface mount
• Same manufacturer: Littelfuse Inc.
• Same product category: PTC resettable fuse (Polymeric)

Functional Compatibility: The substitute part operates within the same electrical envelope. The hold current (Ih) of 6A on the substitute part exceeds the 5.5A requirement of the obsolete part, providing equivalent or superior performance in hold-state operation. Both components are designed for identical voltage and package specifications, ensuring mechanical and electrical interchangeability in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The 1206L600SLWR is the qualified substitute for the obsolete NANOSMD550LR-2 based on the following engineering criteria:

Product Status Alignment: The substitute part is in active production status, ensuring long-term availability and supply chain continuity. The original part is obsolete and subject to discontinuation.

Compliance and Certification: Both parts maintain RoHS compliance. The substitute achieves ROHS3 compliance, representing current regulatory standards. Both components carry ECCN EAR99 classification and identical HTSUS codes (8533.40.8070), confirming regulatory equivalence.

Electrical Compatibility: The 6V maximum voltage rating is identical. The substitute's 6A hold current exceeds the 5.5A specification of the original part, providing equivalent or superior performance within the same circuit application.

Mechanical Compatibility: Both components use identical 1206 (3216 Metric) surface mount packaging. The substitute features a concave profile, which is a standard manufacturing variation within the 1206 package specification and does not affect PCB assembly compatibility.

Moisture Handling: The substitute part carries MSL 1 (Unlimited) rating, representing improved moisture sensitivity performance compared to the original part's MSL 2A (4 Weeks) rating.

Frequently Asked Questions (FAQ)

Q: Can the 1206L600SLWR directly replace the NANOSMD550LR-2 on existing PCBs?

A: Yes. Both components use identical 1206 (3216 Metric) surface mount packaging and mounting specifications. No PCB layout modifications are required.

Q: What is the significance of the higher 6A hold current on the substitute part?

A: The substitute part's 6A hold current exceeds the original 5.5A specification. This provides equivalent or superior performance in applications where the original part was specified. The substitute will not trip at lower current levels than the original design intended.

Q: Does the "Concave" profile on the substitute part affect compatibility?

A: No. The concave profile is a standard manufacturing variation within the 1206 package specification and does not affect electrical performance or PCB assembly compatibility.

Q: What is the difference between MSL 2A and MSL 1?

A: MSL 2A (4 Weeks) indicates the component must be used within 4 weeks of package opening under controlled humidity conditions. MSL 1 (Unlimited) indicates no moisture sensitivity restrictions. The substitute part offers improved handling flexibility.

Q: Are both parts RoHS compliant?

A: Yes. The original part is RoHS Compliant. The substitute part is ROHS3 Compliant, representing current regulatory standards. Both meet RoHS requirements.

Q: What certifications does the substitute part carry?

A: The 1206L600SLWR carries cURus and TUV approvals, providing third-party validation of electrical safety and performance characteristics.

Q: Is the substitute part from the same manufacturer?

A: Yes. Both the NANOSMD550LR-2 and 1206L600SLWR are manufactured by Littelfuse Inc., ensuring consistent design philosophy and quality standards.