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NANOSMD350LR-2 Equivalent & Substitute Parts
Part Overview
The NANOSMD350LR-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc., rated for 6V at 4.6A hold current in a 1206 (3216 Metric) surface mount package. This component is classified as Obsolete, indicating it is no longer in active production. Identifying equivalent and substitute parts is necessary to support ongoing maintenance, repair, and new design implementations where this specification remains applicable.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | NANOSMD350LR-2 |
| Manufacturer | Littelfuse Inc. |
| Product Type | Polymeric PTC Resettable Fuse |
| Voltage - Max | 6V |
| Current - Hold (Ih) (Max) | 4.6 A |
| Current - Trip (It) | 6.3 A |
| Current - Max | 50 A |
| Time to Trip | 5 s |
| Resistance - Initial (Ri) (Min) | 4 mOhms |
| Package / Case | 1206 (3216 Metric) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Approval Agency | CSA, TUV, UL |
Substitute Part Grouping Explanation
Substitution of the NANOSMD350LR-2 is determined by the following critical parameters:
Voltage Rating: All substitute parts must maintain 6V maximum voltage rating to ensure electrical compatibility.
Current - Hold (Ih): The hold current rating determines the maximum continuous current the fuse can carry without tripping. Substitutes with equal or higher Ih ratings can replace the original part in applications where the circuit current does not exceed the substitute's trip threshold.
Package / Case: The 1206 (3216 Metric) surface mount package is a standard footprint. Substitutes in smaller packages (0402, 0603, 0805) are physically incompatible with the original PCB layout and require board redesign. Substitutes in the same or larger package may be considered if electrical parameters align.
Mounting Type: All substitutes must be surface mount to maintain assembly compatibility.
Product Status: Active status substitutes ensure ongoing availability and supply chain reliability, whereas obsolete parts present future sourcing risk.
Compliance & Certifications: RoHS3 compliance and approval by CSA, TUV, or UL certifications must be maintained for regulatory and safety requirements.
Based on these criteria, the provided substitute list includes parts across multiple package sizes (0402, 0603, 0805) with varying current ratings. Direct package-compatible substitutes (1206 package) are not present in the provided list. Substitutes in smaller packages represent design alternatives requiring PCB modification.
Parameter Comparison
| Part Number | Voltage - Max | Current - Hold (Ih) (Max) | Current - Trip (It) | Current - Max | Time to Trip | Resistance - Initial (Ri) (Min) | Package / Case | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| NANOSMD350LR-2 | 6V | 4.6 A | 6.3 A | 50 A | 5 s | 4 mOhms | 1206 (3216 Metric) | Obsolete | ROHS3 Compliant |
| 0402L035SLKR | 6V | 350 mA | 700 mA | 50 A | 100 ms | 50 mOhms | 0402 (1005 Metric) | Active | ROHS3 Compliant |
| 0402L050SLKR | 6V | 500 mA | 1 A | 50 A | 100 ms | 40 mOhms | 0402 (1005 Metric) | Active | ROHS3 Compliant |
| 0603L050SLYR | 6V | 500 mA | 1 A | 50 A | 100 ms | 70 mOhms | 0603 (1608 Metric) | Active | ROHS3 Compliant |
| 0603L075SLYR | 6V | 750 mA | 1.5 A | 50 A | 200 ms | 20 mOhms | 0603 (1608 Metric) | Active | ROHS3 Compliant |
| 0603L100SLYR | 6V | 1 A | 1.8 A | 50 A | 300 ms | 40 mOhms | 0603 (1608 Metric) | Active | ROHS3 Compliant |
| 0603L150SLYR | 6V | 1.5 A | 3 A | 50 A | 500 ms | 7 mOhms | 0603 (1608 Metric) | Active | ROHS3 Compliant |
| 0603L175SLYR | 6V | 1.75 A | 4.6 A | 50 A | 600 ms | 5 mOhms | 0603 (1608 Metric) | Active | ROHS3 Compliant |
| 0805L110SLYR | 6V | 1.1 A | 1.8 A | 50 A | 300 ms | 30 mOhms | 0805 (2012 Metric) | Active | ROHS3 Compliant |
| 0805L150SLYR | 6V | 1.5 A | 3 A | 50 A | 500 ms | 15 mOhms | 0805 (2012 Metric) | Active | ROHS3 Compliant |
| 0805L175SLYR | 6V | 1.75 A | 4.6 A | 50 A | 600 ms | 5 mOhms | 0805 (2012 Metric) | Active | ROHS3 Compliant |
Engineering Selection Recommendations
All substitute parts listed maintain 6V voltage rating and 50A maximum current capacity, meeting the core electrical specification of the NANOSMD350LR-2. All substitutes are ROHS3 compliant and carry active product status, ensuring regulatory compliance and supply chain continuity.
For direct electrical replacement with package modification: The 0603L175SLYR and 0805L175SLYR both provide 1.75A hold current with 4.6A trip current, matching the original part's trip threshold. These parts require PCB redesign due to package size change from 1206 to 0603 or 0805 respectively.
For lower current applications: Parts with reduced hold current ratings (0402L035SLKR, 0402L050SLKR, 0603L050SLYR, 0603L075SLYR, 0603L100SLYR, 0805L110SLYR, 0805L150SLYR) are suitable only if circuit current requirements are lower than the original 4.6A specification.
Package compatibility consideration: No substitute in the original 1206 package is provided. Selection of any substitute requires verification that the target package footprint is compatible with the PCB layout or that board redesign is feasible.
Frequently Asked Questions (FAQ)
Q: Can I use a substitute part with a lower hold current rating than the NANOSMD350LR-2?
A: Only if your circuit's normal operating current is below the substitute's hold current rating. The hold current (Ih) is the maximum continuous current the fuse permits without tripping. Using a part with lower Ih in a circuit designed for 4.6A will cause nuisance trips.
Q: What is the difference between hold current (Ih) and trip current (It)?
A: Hold current is the maximum continuous current the fuse can carry indefinitely without activation. Trip current is the threshold at which the fuse transitions to high resistance state. The NANOSMD350LR-2 holds at 4.6A and trips at 6.3A.
Q: Are all substitutes compatible with my existing PCB?
A: No. The NANOSMD350LR-2 uses a 1206 (3216 Metric) package. All provided substitutes use smaller packages (0402, 0603, 0805). Physical footprint compatibility requires either PCB redesign or use of an adapter. Verify package dimensions before selection.
Q: Why do some substitutes have faster trip times (100 ms vs. 5 s)?
A: Trip time is determined by the fuse's thermal response characteristics and polymer composition. Faster trip times provide quicker circuit protection but may be unsuitable for applications requiring tolerance of transient current spikes. Verify trip time compatibility with your circuit's expected behavior.
Q: Are all substitutes RoHS3 compliant?
A: Yes. All listed substitutes are ROHS3 compliant, maintaining regulatory compliance with the original part.
Q: What certifications do the substitutes carry?
A: All substitutes carry cURus and TUV approvals. The original NANOSMD350LR-2 carries CSA, TUV, and UL approvals. Verify that substitute certifications meet your application's regulatory requirements.
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