NANOSMD380LR PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The NANOSMD380LR is a PTC resettable fuse manufactured by Littelfuse Inc., rated for 6V at 3.8A in a 1206 surface mount package. This component is classified as obsolete, indicating that direct procurement from original inventory may be limited or unavailable. PTC resettable fuses provide automatic overcurrent protection by increasing resistance when excessive current is detected, then resetting when the fault condition is removed. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure uninterrupted supply chain access for applications requiring this protection function.

Substiute Parts

NANOSMD380LR

Littelfuse Inc.In Stock: 1059NANOSMD380LR Datasheet

Current PartRFQ

1206L380SLTHYR

Littelfuse Inc.In Stock: 483911206L380SLTHYR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the NANOSMD380LR are identified based on the following critical parameters that determine functional compatibility:

Voltage Rating: The substitute must operate at the same maximum voltage (6V) to ensure proper protection characteristics in the application circuit.

Package / Case: The substitute must use the 1206 (3216 Metric) surface mount package to maintain mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Mounting Type: The substitute must be surface mount to align with current manufacturing and assembly standards.

Current Rating Range: While the hold current (Ih) may vary within acceptable limits for the application, the substitute must provide overcurrent protection in the same voltage and package class.

Regulatory Compliance: The substitute must maintain RoHS compliance and carry the same ECCN and HTSUS classifications to ensure regulatory and trade compliance.

The 1206L380SLTHYR meets these substitution criteria as an active product offering from Littelfuse Inc. in the same package and voltage class.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 1206L380SLTHYR

The 1206L380SLTHYR is the recommended substitute for the obsolete NANOSMD380LR based on the following engineering criteria:

Regulatory Alignment: Both components carry EAR99 ECCN classification and 8533.40.8070 HTSUS code, ensuring consistent export control and tariff treatment. The 1206L380SLTHYR achieves ROHS3 compliance, which supersedes the RoHS compliance of the original part.

Package Compatibility: Both components use the 1206 (3216 Metric) surface mount package, enabling direct PCB layout compatibility without redesign.

Voltage Class: Both components are rated for 6V maximum voltage, maintaining electrical protection characteristics within the same voltage domain.

Product Status: The 1206L380SLTHYR is classified as active, ensuring reliable long-term availability and supply chain continuity compared to the obsolete NANOSMD380LR.

Current Characteristics: The 1206L380SLTHYR has a hold current (Ih) of 2.82A, which is lower than the original 3.8A specification. This difference requires circuit-level evaluation to confirm that the lower hold current provides adequate protection for the intended application without nuisance tripping.

Frequently Asked Questions (FAQ)

Q: Can the 1206L380SLTHYR be used as a direct replacement for the NANOSMD380LR without circuit modification?

A: Both components share the same 6V voltage rating, 1206 surface mount package, and regulatory classifications. However, the 1206L380SLTHYR has a lower hold current (2.82A versus 3.8A). Direct substitution is mechanically and electrically feasible from a package and voltage perspective, but the application circuit must be evaluated to confirm that the lower hold current does not cause nuisance tripping under normal operating conditions.

Q: What is the significance of the "Concave" package designation on the 1206L380SLTHYR?

A: The concave package designation indicates the physical profile of the component body. This is a mechanical characteristic that affects how the component sits on the PCB during assembly. Concave packages are compatible with standard 1206 PCB footprints and reflow soldering processes.

Q: Are there any moisture sensitivity differences between these components?

A: The NANOSMD380LR has a Moisture Sensitivity Level (MSL) of 2A (4 Weeks), while the 1206L380SLTHYR has an MSL of 1 (Unlimited). The 1206L380SLTHYR has superior moisture resistance, requiring less stringent handling and storage conditions.

Q: Why is the NANOSMD380LR classified as obsolete?

A: Obsolete status indicates that the manufacturer has discontinued production and support for this component. The 1206L380SLTHYR represents the active product line continuation from Littelfuse Inc. in this component category.

Q: Do both components carry the same regulatory approvals?

A: Both components carry cURus and TUV approvals (as specified for the 1206L380SLTHYR). Both are classified under the same ECCN (EAR99) and HTSUS code (8533.40.8070), ensuring consistent regulatory treatment in procurement and export scenarios.