NANOSMD600LR-2 Equivalent & Substitute Parts

Part Overview

The NANOSMD600LR-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc., rated for 6V and 6A hold current in a 1206 (3216 Metric) surface mount package. This component is classified as Obsolete, making identification of compatible substitute parts essential for ongoing design support and procurement.

PTC resettable fuses provide automatic overcurrent protection by increasing resistance when current exceeds the trip threshold, then resetting when the fault condition is removed. The obsolete status of the NANOSMD600LR-2 necessitates evaluation of active alternative components that maintain electrical and mechanical compatibility.

Substiute Parts

NANOSMD600LR-2

Littelfuse Inc.In Stock: 981NANOSMD600LR-2 Datasheet

Current PartRFQ

1206L600SLWR

Littelfuse Inc.In Stock: 142451206L600SLWR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NANOSMD600LR-2 is determined by the following critical parameters:

• Voltage Rating: Maximum voltage must be 6V or greater
• Current - Hold (Ih): Must be rated for 6A or greater
• Current - Trip (It): Must be 12A or greater
• Package / Case: Must be 1206 (3216 Metric) surface mount
• Mounting Type: Surface mount configuration required
• RoHS Compliance: ROHS3 Compliant status required

The substitute part 1206L600SLWR meets all critical substitution criteria. Both components share identical voltage and hold current ratings, trip current specifications, and package form factor. The substitute maintains surface mount compatibility and RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The 1206L600SLWR is a direct functional substitute for the obsolete NANOSMD600LR-2. Both components are manufactured by Littelfuse Inc. and share identical electrical ratings for voltage, hold current, trip current, and response time.

The substitute part offers the following advantages:

• Active product status ensures ongoing availability and manufacturing support
• Extended operating temperature range (-40°C ~ 85°C vs. -40°C ~ 80°C)
• Improved moisture sensitivity level (1 vs. 2A), indicating superior moisture resistance
• Additional approval certifications (cURus, TUV)
• REACH Unaffected status provides regulatory clarity

Physical dimensions differ slightly due to the concave package variant of the 1206L600SLWR, but both maintain 1206 (3216 Metric) surface mount compatibility. Initial resistance is lower (1 mOhms vs. 2 mOhms) and post-trip resistance is higher (10 mOhms vs. 7 mOhms), both within acceptable operating parameters for this component class.

Frequently Asked Questions (FAQ)

Q: Can the 1206L600SLWR directly replace the NANOSMD600LR-2 on existing PCBs?

A: Yes. Both components use the 1206 (3216 Metric) surface mount package and share identical electrical ratings. The concave variant of the substitute does not affect PCB footprint compatibility.

Q: What is the significance of the different resistance values between these parts?

A: Initial resistance (Ri) and post-trip resistance (R1) are material properties of the PTC element. The 1206L600SLWR exhibits lower initial resistance (1 mOhms vs. 2 mOhms) and higher post-trip resistance (10 mOhms vs. 7 mOhms). Both sets of values are within acceptable operating ranges for 6A-rated PTC resettable fuses and do not affect functional compatibility.

Q: Why is the operating temperature range different?

A: The 1206L600SLWR supports operation to 85°C, compared to 80°C for the NANOSMD600LR-2. This extended range is a material improvement and does not create compatibility issues for applications operating within the original 80°C specification.

Q: What does the Concave package designation mean?

A: The Concave variant refers to the physical profile of the component surface. This is a manufacturing variant within the 1206 (3216 Metric) package family and does not affect electrical performance or PCB mounting compatibility.

Q: Are there any compliance differences between these parts?

A: Both parts are ROHS3 Compliant. The 1206L600SLWR carries additional certifications (cURus, TUV) and REACH Unaffected status, providing broader regulatory acceptance in different markets.