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LQW18CNR65J0ZD: A Murata 0603 650nH Automotive Wirewound Inductor
11/3/2026 12:41:24 AM
LQW18CNR65J0ZD: A Murata 0603 650nH Automotive Wirewound Inductor
1. Positioning
The LQW18CNR65J0ZD is an automotive-grade wirewound fixed inductor from Murata's LQW18CN series. It provides 650nH of inductance in an 0603 (1608 metric) package, with ±5% tolerance, a rated current of 430mA, a maximum DC resistance (DCR) of 520mΩ, a self-resonant frequency (SRF) of 510MHz, and AEC-Q200 qualification. Within Murata's "wound non-magnetic" lineup, the LQW18CN series represents the high-Q, large-current branch, positioned for stable inductance and low loss in high-frequency RF and NFC circuits.
The "CN" designation identifies the sub-series' role: the inductance of the LQW18CN series has extremely low dependence on AC current, so even as the AC current in an NFC circuit increases, the inductance characteristics do not change significantly, while low AC resistance (ACR) is maintained at large currents. This characteristic gives the part direct application value at the 13.56MHz NFC carrier frequency.
2. Key Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Murata Electronics |
| Series | LQW18CN (Wirewound, Non-magnetic, High Q) |
| Inductance / Tolerance | 650 nH ±5% |
| Rated Current | 430 mA |
| DC Resistance (DCR) | 520 mΩ (Max) |
| Self-Resonant Frequency (SRF) | 510 MHz |
| Inductance Test Frequency | 10 MHz |
| Package / Size | 0603 (1608 Metric) / 1.6 × 0.8 mm |
| Maximum Height | 0.95 mm |
| Core Material | Ferrite |
| Shielding | Unshielded |
| Operating Temperature | -40°C to +125°C |
| Automotive Qualification | AEC-Q200 |
| RoHS | ROHS3 Compliant |
3. Engineering Significance in NFC Circuits
In NFC circuits, inductors are used primarily in the LC low-pass filter and the matching network. The LC filter removes high-frequency components from the IC output that are unnecessary for communication, but because the filter sits close to the downstream matching circuit, its component constants directly affect the matching condition. For this reason, an inductor used in the LC filter must have a narrow inductance tolerance and an inductance value that is independent of the current value.
The LQW18CNR65J0ZD's ±5% tolerance satisfies the first requirement. For the second, Murata states that the LQW18CN series has "extremely low dependence on AC current," so characteristics do not change significantly even as the AC current in the NFC circuit increases. At the 13.56MHz carrier frequency, the series also maintains low ACR at larger currents, reducing unnecessary loss. The 650nH value, combined with a 510MHz SRF, places operation well below resonance, so the part behaves as a near-ideal inductive element within the NFC band.
4. Questions and Answers
Q: What distinguishes the "CN" sub-series from a general LQW18 part?
A: The LQW18 family is a broad wirewound inductor range covering inductance from 2.2nH to 650nH. The LQW18CN sub-series is oriented differently: it emphasizes low dependence on AC current and low ACR at large currents, optimized specifically for LC filtering and matching in NFC and short-range wireless communication. General LQW18 part numbers may focus more on standard Q or specific frequency-band performance, whereas the CN series addresses the specific problem of inductance not drifting as current changes.
Q: What role does 650nH play in an NFC circuit?
A: In an NFC LC low-pass filter, the inductance works with capacitance to set the filter's corner frequency and impedance characteristic. 650nH is one of the higher inductance options in the series, suited to circuit nodes that require a specific filtering constant or matching impedance. The exact value must be determined in the context of the capacitance, antenna impedance, and IC output characteristics-it cannot be evaluated in isolation from the overall network.
Q: Is the 430mA current rating sufficient for NFC circuit demands?
A: The AC current during NFC communication is typically well below 430mA; 430mA is the continuous rating. More important is the LQW18CN series' property of maintaining stable inductance as AC current varies, meaning that within the actual NFC operating current range, the inductance does not drift from its design value. For matching network stability, this matters more than raw current headroom.
Q: Does AEC-Q200 qualification mean it can be used in automotive powertrain?
A: AEC-Q200 confirms that the part has passed automotive stress qualification for passive components, but whether it is suitable for a powertrain location depends on the specific temperature, vibration, and reliability requirements of that location. The device's 125°C ceiling and unshielded wirewound construction are better matched to infotainment, body electronics, and NFC module nodes in the passenger compartment or moderate environments. High-temperature powertrain locations typically require higher temperature grades or different construction.
5. Conclusion
The value of the LQW18CNR65J0ZD lies in delivering 650nH in an automotive 0603 package, with ±5% tolerance, low AC-current dependence, and a 510MHz self-resonant frequency, specifically serving LC filtering and matching needs in NFC and high-frequency RF circuits. It is not a general-purpose power inductor; the 430mA current capability and 520mΩ DCR define its boundaries. Understanding the "CN" sub-series' emphasis on current stability, and the role of 650nH within the overall filter network, is the key to applying this part correctly.
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