NANOSMD175LR-E PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The NANOSMD175LR-E is a PTC resettable fuse rated for 6V at 1.75A in a 1206 surface mount package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement. PTC (Positive Temperature Coefficient) resettable fuses provide automatic overcurrent protection by increasing resistance when excessive current flows, then resetting when the fault condition is removed. Locating functionally equivalent active parts ensures design continuity and supply chain reliability.

Substiute Parts

NANOSMD175LR-E

Littelfuse Inc.In Stock: 1009NANOSMD175LR-E Datasheet

Current PartRFQ

1206L175SLYR

Littelfuse Inc.In Stock: 28031206L175SLYR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NANOSMD175LR-E is determined by the following critical parameters:

Voltage Rating: The substitute part must operate at the same maximum voltage of 6V to ensure circuit protection at the design specification.

Current - Hold (Ih): The substitute must maintain a hold current of 1.75A, which defines the maximum continuous current the fuse allows without tripping.

Package / Case: The substitute must use the 1206 (3216 Metric) surface mount package to ensure mechanical and electrical compatibility with the PCB layout.

Mounting Type: The substitute must be surface mount to maintain assembly process compatibility.

The 1206L175SLYR meets all four critical substitution criteria, making it a direct functional equivalent for the obsolete NANOSMD175LR-E.

Parameter Comparison

Engineering Selection Recommendations

The 1206L175SLYR is the direct substitute for the obsolete NANOSMD175LR-E based on the following engineering criteria:

Electrical Equivalence: Both parts share identical voltage (6V) and hold current (1.75A) specifications, ensuring equivalent circuit protection performance.

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

Compliance Status: The 1206L175SLYR carries active product status with ROHS3 compliance, providing long-term supply availability and regulatory alignment. The substitute meets or exceeds the RoHS compliance level of the original part.

Regulatory Classification: Both parts share identical ECCN (EAR99) and HTSUS (8533.40.8070) classifications, maintaining consistent export and tariff treatment.

Series Designation: The 1206L175SLYR belongs to the POLY-FUSE® LoRho series, representing the current generation of Littelfuse polymeric PTC resettable fuses.

Frequently Asked Questions (FAQ)

Q: Can the 1206L175SLYR be used as a direct replacement for the NANOSMD175LR-E without circuit modifications?

A: Yes. Both parts share identical voltage (6V) and hold current (1.75A) ratings, and both use the 1206 surface mount package. No circuit modifications are required for electrical or mechanical compatibility.

Q: What is the difference between the NANOSMD175LR-E and 1206L175SLYR packaging?

A: The NANOSMD175LR-E is listed with standard packaging, while the 1206L175SLYR is supplied in Tape & Reel (TR) format with a concave package profile. Both maintain the same 1206 (3216 Metric) footprint and surface mount compatibility.

Q: Why is the NANOSMD175LR-E classified as obsolete?

A: The NANOSMD175LR-E has been discontinued by Littelfuse Inc. The 1206L175SLYR represents the active equivalent part for ongoing procurement and new designs.

Q: Are there any differences in operating temperature ranges between these parts?

A: The 1206L175SLYR specifies an operating temperature range of -40°C to 85°C. The NANOSMD175LR-E operating temperature range is not provided in the available documentation.

Q: Does the 1206L175SLYR meet the same regulatory compliance as the original part?

A: Yes. The 1206L175SLYR is ROHS3 compliant, which exceeds the RoHS compliance requirement of the NANOSMD175LR-E. Both parts share identical ECCN and HTSUS classifications.

Q: What is the moisture sensitivity level difference between these parts?

A: The NANOSMD175LR-E has MSL 2A (4 Weeks), while the 1206L175SLYR has MSL 1 (Unlimited). The substitute part has lower moisture sensitivity, providing more flexible storage and handling conditions.

Q: Can I use the 1206L175SLYR in existing inventory management systems coded for NANOSMD175LR-E?

A: The 1206L175SLYR is a functional equivalent with identical electrical and mechanical specifications. However, inventory systems should be updated to reflect the new part number and active product status for accurate tracking and procurement.