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NANOSMD200LR-2 Equivalent & Substitute Parts
Part Overview
The NANOSMD200LR-2 is a Polymeric PTC Resettable Fuse manufactured by Littelfuse Inc., rated for 6V maximum voltage with a 2A hold current (Ih) 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 maintain design continuity, ensure supply chain availability, and support ongoing manufacturing or repair operations for legacy systems utilizing this fuse specification.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | NANOSMD200LR-2 |
| Manufacturer | Littelfuse Inc. |
| Series | PolySwitch®, LoRho |
| Type | Polymeric |
| Voltage - Max | 6V |
| Current - Hold (Ih) (Max) | 2 A |
| Current - Trip (It) | 6 A |
| Current - Max | 50 A |
| Time to Trip | 3 s |
| Resistance - Initial (Ri) (Min) | 6 mOhms |
| Mounting Type | Surface Mount |
| Package / Case | 1206 (3216 Metric) |
| Size / Dimension | 0.127" L x 0.063" W (3.22mm x 1.60mm) |
| Thickness (Max) | 0.039" (1.00mm) |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Approval Agency | CSA, UL |
Substitute Part Grouping Explanation
Substitution of the NANOSMD200LR-2 is determined by the following critical parameters:
Voltage Rating: All substitute parts must maintain the 6V maximum voltage specification to ensure circuit protection integrity.
Current - Hold (Ih): The hold current defines the maximum continuous current the fuse allows without tripping. Substitutes are grouped by current rating: 350mA, 500mA, 750mA, 1A, 1.1A, 1.5A, and 1.75A. Selection depends on the protected circuit's nominal operating current.
Package / Case: Substitute parts are available in multiple surface mount packages (0402, 0603, 0805) to accommodate different PCB layout constraints. Package selection is independent of electrical function but affects board space and thermal characteristics.
Type & Series: All substitutes are Polymeric PTC resettable fuses from the POLY-FUSE® or PolySwitch® series, maintaining functional equivalence and reset capability.
Product Status & Compliance: Active status substitutes ensure ongoing availability. All listed substitutes maintain ROHS3 compliance and carry cURus or TUV certifications, meeting modern regulatory requirements.
Parameter Comparison
| Part Number | Voltage (Max) | Current - Hold (Ih) | Current - Trip (It) | Package | Size (mm) | Thickness (Max) | Product Status | Approval Agency |
|---|---|---|---|---|---|---|---|---|
| NANOSMD200LR-2 | 6V | 2 A | 6 A | 1206 (3216) | 3.22 x 1.60 | 1.00mm | Obsolete | CSA, UL |
| 0402L035SLKR | 6V | 350 mA | 700 mA | 0402 (1005) | 1.00 x 0.50 | 0.60mm | Active | cURus, TUV |
| 0402L050SLKR | 6V | 500 mA | 1 A | 0402 (1005) | 1.00 x 0.50 | 0.60mm | Active | cURus, TUV |
| 0603L050SLYR | 6V | 500 mA | 1 A | 0603 (1608) | 1.60 x 0.80 | 0.75mm | Active | cURus, TUV |
| 0603L075SLYR | 6V | 750 mA | 1.5 A | 0603 (1608) | 1.60 x 0.80 | 0.75mm | Active | cURus, TUV |
| 0603L100SLYR | 6V | 1 A | 1.8 A | 0603 (1608) | 1.60 x 0.80 | 0.75mm | Active | cURus, TUV |
| 0603L150SLYR | 6V | 1.5 A | 3 A | 0603 (1608) | 1.60 x 0.80 | 1.00mm | Active | cURus, TUV |
| 0603L175SLYR | 6V | 1.75 A | 4.6 A | 0603 (1608) | 1.60 x 0.80 | 1.00mm | Active | cURus, TUV |
| 0805L110SLYR | 6V | 1.1 A | 1.8 A | 0805 (2012) | 2.10 x 1.35 | 0.75mm | Active | cURus, TUV |
| 0805L150SLYR | 6V | 1.5 A | 3 A | 0805 (2012) | 2.10 x 1.35 | 0.75mm | Active | cURus, TUV |
| 0805L175SLYR | 6V | 1.75 A | 4.6 A | 0805 (2012) | 2.10 x 1.35 | 0.60mm | Active | cURus, TUV |
Engineering Selection Recommendations
All listed substitute parts are manufactured by Littelfuse Inc. and maintain the same 6V voltage rating as the NANOSMD200LR-2. Each substitute is classified as Active product status, ensuring continued availability and supply chain support.
Compliance & Certifications: All substitutes carry cURus and TUV approvals, meeting current regulatory standards. The original NANOSMD200LR-2 carries CSA and UL certifications; substitutes with cURus and TUV certifications provide equivalent regulatory coverage for modern applications.
Current Rating Selection: Choose the substitute current rating based on the protected circuit's nominal operating current. The NANOSMD200LR-2 specifies a 2A hold current; substitutes range from 350mA to 1.75A. If the circuit requires protection at or near 2A, the 0603L150SLYR or 0805L150SLYR (both 1.5A) provide the closest functional match, with 0805L175SLYR (1.75A) as an alternative.
Package Considerations: The original 1206 package is larger than available substitutes. The 0603 package offers a balance between size reduction and thermal performance. The 0402 package provides maximum space savings for compact designs. The 0805 package accommodates applications requiring enhanced thermal dissipation.
Resistance Characteristics: Initial resistance (Ri) varies across substitutes. Lower Ri values (5-7 mOhms in 0603L175SLYR and 0805L175SLYR) minimize voltage drop during normal operation. Higher Ri values (40-70 mOhms) are acceptable where voltage drop is not a critical constraint.
Frequently Asked Questions (FAQ)
Q: Can I directly replace NANOSMD200LR-2 with any of these substitutes?
A: Direct replacement requires matching the circuit's current protection requirement. The NANOSMD200LR-2 provides 2A hold current protection. Substitutes with 1.5A or 1.75A hold current ratings provide the closest functional equivalence. Lower current-rated substitutes (350mA to 1.1A) are suitable only if the protected circuit operates at those lower current levels.
Q: What is the difference between hold current (Ih) and trip current (It)?
A: Hold current (Ih) is the maximum continuous current the fuse allows without activation. Trip current (It) is the threshold at which the fuse activates to interrupt the circuit. For the NANOSMD200LR-2, Ih is 2A and It is 6A. Substitutes maintain this proportional relationship within their respective current ratings.
Q: Does package size affect electrical performance?
A: Package size does not alter the electrical protection characteristics (voltage, current ratings, trip behavior). Package selection is determined by PCB layout constraints and thermal management requirements. Smaller packages (0402, 0603) occupy less board space; larger packages (0805) provide improved thermal dissipation.
Q: Are all substitutes RoHS compliant?
A: Yes. The NANOSMD200LR-2 is ROHS3 compliant, and all listed substitutes maintain ROHS3 compliance, ensuring compatibility with modern manufacturing and environmental standards.
Q: What certifications do the substitutes carry?
A: All substitutes carry cURus and TUV certifications. The original NANOSMD200LR-2 carries CSA and UL certifications. cURus and TUV certifications provide equivalent regulatory coverage and are widely accepted in current applications.
Q: Can I use a substitute with a lower current rating than the original?
A: Only if your circuit's actual operating current is lower than the original specification. Using a lower-rated fuse will cause nuisance trips if the circuit draws current above the substitute's hold current rating. Verify the circuit's actual current draw before selecting a lower-rated substitute.
Q: What is the moisture sensitivity level (MSL) difference?
A: The NANOSMD200LR-2 specifies MSL 2A (4 weeks). Most active substitutes specify MSL 1 (Unlimited), indicating superior moisture resistance and longer shelf life without special storage conditions.
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