I’ll research the NANOSMDC200F-2 manufacturer data, verify practical integration guidance and alternatives, and save the cited application guide in your project files.
I verified the key ratings and temperature derating, including the distinction between 2 A hold current and 4 A trip current. Some additional source lookups remain unresolved, so I’ll explicitly flag those gaps and avoid claiming any alternative is a verified drop-in replacement.
The Littelfuse NANOSMDC200F-2 is a PolySwitch polymeric positive-temperature-coefficient (PPTC) resettable fuse in a 1206 surface-mount package, with a 2.0 A hold rating at 25°C and a maximum electrical rating of 6.0 V DC. A common design-in use is series overcurrent protection on a low-voltage peripheral or portable-electronics power rail; it limits fault current rather than providing an open-circuit disconnect, as explained in Littelfuse’s PPTC operating guidance.
Unresolved items are explicitly flagged: exact land pattern, assembly process, purchasing MOQ, and full alternative qualification—no unverified drop-in claims. Before production, prioritize footprint verification and hot-load/fault testing.
The Littelfuse NANOSMDC200F-2 is a PolySwitch polymeric positive-temperature-coefficient (PPTC) resettable fuse in a 1206 surface-mount package, with a 2.0 A hold rating at 25°C and a maximum electrical rating of 6.0 V DC. A common design-in use is series overcurrent protection on a low-voltage peripheral or portable-electronics power rail; it limits fault current rather than providing an open-circuit disconnect, as explained in Littelfuse’s PPTC operating guidance.
1. Quick Specifications
The product specification uses Maximum Electrical Rating and Performance Ratings, not separate semiconductor-style absolute-maximum and recommended-operating tables. Treat maximum electrical ratings as limits, not normal operating targets; hold/trip currents are temperature-dependent performance ratings.
Table
Parameter
Verified value / condition
Classification and integration meaning
Maximum electrical voltage
6.0 V DC.
Maximum rating; check the voltage across the device during a fault, not only its small normal voltage drop.
Maximum short-circuit current
100 A.
Fault-withstand rating, not continuous load current.
Hold / trip current at 25°C
2.0 A / 4.0 A.
Performance rating; this is not a precise 2 A current limiter.
Hold / trip current at 0°C
2.35 A / 4.7 A.
Cold-temperature performance rating.
Hold / trip current at 60°C
1.5 A / 3.0 A.
Hot-temperature performance rating; a continuous 2 A load is unsuitable at this temperature.
Maximum time to trip
1.5 s at 8.0 A and 25°C.
Applies only to the stated test point; not a universal delay.
Resistance at 25°C
0.020 Ω minimum; 0.072 Ω maximum.
No typical resistance supplied in the verified table.
Maximum-resistance measurement
One hour after reflow.
Do not relabel this part-specific condition as an immediate post-trip value.
Maximum tripped-state power
1.0 W at 25°C and 6.0 V.
Fault-state heating; not a general-purpose continuous power rating.
Drawing labels retained to avoid inventing geometry interpretations; consult the source drawing.
Operating temperature
−40°C to +85°C listed by DigiKey; not independently verified from the retrieved part-specific specification.
Temperature range does not imply the 2 A hold rating across the range.
Recommended normal operation
Select load current below the applicable hot-ambient hold rating, including design margin; keep worst-case voltage and prospective fault current within the maximum ratings.
Engineering recommendation, not a manufacturer-specified operating range or fixed derating percentage.
Pin pitch / exact PCB land pattern
Unverified for this exact part in the retrieved evidence.
Two end terminations; 1206 is a size code, not a connector pitch.
2. Pinout & Connections
The device has two interchangeable end terminations, not IN/OUT control pins. The numbering below is a schematic convention; manufacturer-defined terminal numbering was not verified.
Table
Pin Number
Pin Name
Description
Best Practice
1 (convention)
Terminal 1
One end of the series protection element.
Connect to the incoming positive supply in the standard high-side circuit.
2 (convention)
Terminal 2
Other end of the series protection element.
Connect to the protected load supply; swapping the two terminals does not change the intended series protection function.
No ground pin, enable pin, pull-up, or pull-down is required. Do not connect the device directly between supply and ground: that would create a low-resistance shunt, not protect the load.
This is engineering integration guidance for a series PPTC, not a copied manufacturer reference schematic. For a board power input, place F1 near the incoming power connector so that the protected downstream branch passes through it; for a powered output port, place it at that branch’s supply origin.
Required support passives: none for the PPTC itself. Add load decoupling and bulk capacitance according to the downstream circuit requirements; there is no verified universal capacitor value for this fuse.
Capacitor placement: downstream decoupling belongs between PROTECTED+ and return, close to the consuming IC. Its discharge into a local downstream short is not interrupted by the upstream PPTC; evaluate stored energy and startup charging current.
Voltage selection: a nominal low-voltage rail is acceptable only when its worst-case fault voltage remains within 6.0 V DC. Do not use this device on a higher-voltage USB-PD contract or multi-cell battery merely because its normal series drop is small.
Current selection: use the verified hold current at the local operating temperature, not just room ambient; at 60°C it is 1.5 A. Check startup/inrush and downstream fault tolerance experimentally on the final PCB.
Reset procedure: clear the fault, remove power, and allow cooling before reconnecting. The manufacturer’s PPTC operating guidance explains that a tripped device retains leakage current and is not an isolating disconnect; no exact reset time or exact-part leakage current was verified.
Voltage-drop and dissipation estimate
Using the verified 0.072 Ω maximum resistance at 25°C, measured one hour after reflow:
At 1 A: calculated Vdrop = I × R = 72 mV; P = I²R = 72 mW.
At 2 A: calculated Vdrop = 144 mV; P = 288 mW.
These are fixed-resistance estimates, not guaranteed hot-operating bounds: self-heating changes resistance. Include connector and trace losses separately and measure the voltage budget under hot steady load.
LED series-resistor calculations, USB CC pull-downs, and shield connections are not requirements of this component and are intentionally omitted. If used in a USB design, the fuse protects only the power branch; interface configuration and protocol-compliant current control remain separate responsibilities.
4. PCB Layout & Routing Guidelines
Verify the land pattern before fabrication. Match the exact manufacturer termination drawing, not an arbitrary 1206 resistor footprint. The exact recommended pads and pad spacing remain unverified; do not release new manufacturing geometry based on the package name alone.
Size copper for the complete power path. Check continuous current, allowed temperature rise, copper thickness, vias, neck-downs, and fault exposure. The specified performance was tested with 0.040-inch-wide, 2.0-ounce copper traces. That is approximately 1.016 mm by unit conversion, a reference test geometry—not a universal minimum or a guarantee for a different stackup.
Treat thermal reliefs and planes as part of protection behavior. Narrow relief spokes can bottleneck current; large copper areas change heat removal. Choose solderable, adequately rated pad connections and validate trip/hold behavior with the actual copper geometry rather than assuming either direct pours or reliefs are always correct.
Keep local heat controlled. Avoid adjacent regulators, MOSFETs, or resistors that raise the device ambient temperature. Account for fault-state heating up to the specified 1.0 W at 25°C and 6.0 V when placing temperature-sensitive components.
Separate power protection from signals. Do not insert this PPTC in high-speed differential signal paths. Route any USB data pairs independently; place load decoupling at the load, not next to the fuse as an unsupported fuse requirement.
Exact-part reflow profile, allowed reflow cycles, solder-mask/stencil dimensions, and cleaning/coating restrictions were not verified. Obtain the current manufacturer assembly guidance before production; do not infer a safe process from a generic package class.
5. Common Pitfalls / Things to Watch Out For
Confusing hold, trip, and fault-current ratings. The 2.0 A hold and 4.0 A trip ratings apply at 25°C; the 100 A maximum is a short-circuit rating, not a continuous-current rating. Do not expect an accurate current clamp at 2 A or apply the 1.5 s trip time to all overloads: that maximum was specified at 8.0 A and 25°C.
Treating a tripped PPTC as an open fuse that immediately resets. Leakage and retained heat can keep it in the high-resistance state; clear the fault, remove power, and cool it, as described in Littelfuse’s operating guidance. Use another protection architecture when zero leakage, rapid electronic cutoff, or safety isolation is required.
6. Popular Alternatives & Equivalents
No unconditional drop-in replacement was verified. Two cross-manufacturer options are listed below; only the Bel electrical comparison has fully validated datasheet evidence. Requalify thermal derating, inrush, fault timing, voltage drop, actual pads, height, and approvals before substitution.
2.00 A hold, 3.50 A trip at 23°C; 6 V DC; 100 A fault rating; 1.50 s maximum trip at 8.00 A; Rmin 0.018 Ω; R1max 0.080 Ω. Available in the Flux library.
Functionally similar; two-terminal connection-compatible. Exact footprint compatibility unverified. Lower trip current and different resistance mean it is not electrically identical.
Real ordering code confirmed in the distributor catalog. The manufacturer’s MF-NSMF family document identifies it as a comparable PPTC candidate, but citation-backed datasheet extraction was still pending after two attempts; electrical and dimensional equivalence remain unverified in this guide. Exact MPN lookup did not confirm a Flux library part.
Functionally similar candidate only; not an approved replacement. Neither pin nor footprint compatibility was independently verified.
Both being described as 1206 does not prove common pads, equal thickness, equal temperature behavior, or equal trip curves. The Bel source’s body-dimension and pad-interpretation evidence was incomplete, so no drop-in conclusion is drawn from it.
7. Sourcing & Purchasing Guide
Purchasing information was checked on October 7, 2026. Stock, price, minimum order quantities, and lead times are variable; no live inventory commitment is made here.
Table
Attribute
Details
Primary Distributors
Exact-part listing verified at DigiKey. JLCPCB lists C2153712 for assembly. Mouser and Arrow exact-part listings were not independently confirmed in this research. Confirm seller authorization with the manufacturer before procurement.
Packaging Options
DigiKey lists Tape & Reel, Cut Tape, and Digi-Reel, with distributor codes NANOSMDC200F-2TR-ND, NANOSMDC200F-2CT-ND, and NANOSMDC200F-2DKR-ND respectively; see its product page. These distributor suffixes do not identify different electrical variants.
Standard MOQ
Not verified from the retrieved distributor order table. Third-party pages suggest 1-piece cut tape and 3,000-piece reels, but do not treat those as confirmed MOQ or factory pack quantity; check the seller’s current quote/order page.
Sourcing Advice
Order the complete NANOSMDC200F-2 code and verify the requested package and delivery format. Prefer manufacturer-confirmed franchised supply and traceable lot documentation; avoid treating a non-authorized marketplace’s “original” claim as proof of authenticity. Review current PCNs and current specifications before production.
JLCPCB Assembly
C2153712 is listed as an extended assembly part; availability and fees must be checked for the actual order. JLCPCB states that parts purchased into its parts library are for future PCBA orders and cannot be shipped separately; see the JLCPCB listing.
Bel Fuse 0ZCJ series datasheet. Manufacturer-hosted primary source for the validated alternative electrical comparison; revision/date not verified.
Bourns MF-NSMF series datasheet. Manufacturer-hosted primary source located for the second candidate; a web extraction reports Rev. AF, 09/26, but citation-backed revision and electrical verification remain unresolved.
This guide does not certify the current Flux footprint or inspect a host circuit. Open verification items are the exact land pattern/pitch, assembly process, current MOQ/reel quantity, and the Bourns candidate’s full substitution qualification.