The **AC30-R18K-RC** is an electronic component manufactured by **Allied Components International**. It belongs to the category of **fixed inductors (chokes)**, specifically designed for high-frequency filtering and power supply decoupling. Below is a detailed technical breakdown of its electronic specifications and characteristics. ### 1. Key Technical Specifications | Parameter | Value | Details | | :--- | :--- | :--- | | **Inductance** | 0.18 µH (Microhenries) | Measured at a specific test frequency (usually 25.2 MHz). | | **Tolerance** | ±10% | The actual inductance may vary by up to 10% of the nominal value. | | **Current Rating (Max)** | ~850 mA to 1100 mA | The maximum DC current the inductor can handle without overheating. | | **DC Resistance (DCR)** | ~0.10 to 0.15 Ohms | The resistance of the wire used in the coil. | | **Self-Resonant Frequency** | > 400 MHz | The frequency at which the component starts acting as a capacitor. | | **Mounting Type** | Through-Hole | Axial leaded package. | --- ### 2. Component Composition and Design The AC30 series is constructed using specific materials to ensure stability in RF (Radio Frequency) environments: * **Core Material:** Typically uses a **Phenolic or Ferrite core**. Given the low inductance value (0.18 µH), it likely uses a non-magnetic or low-permeability core to maintain high-frequency performance. * **Encapsulation:** The "RC" suffix indicates **RoHS Compliance**, meaning it is manufactured without lead, mercury, or other hazardous substances. The body is usually coated in a conformal epoxy or phenolic resin for environmental protection. * **Form Factor:** Axial leads (like a resistor) make it easy to mount on standard PCBs using wave soldering or manual assembly. --- ### 3. Circuit Applications This part is commonly used in the following electronic scenarios: 1. **RF Filtering:** Used in radio frequency circuits to block unwanted high-frequency noise while allowing DC and low-frequency signals to pass. 2. **Decoupling:** Placed near power supply pins of integrated circuits (ICs) to prevent noise from the power rail from entering the chip. 3. **Signal Conditioning:** Used in oscillators and tuning circuits where precise, low-inductance values are required. 4. **EMI Suppression:** Helps in reducing electromagnetic interference in consumer electronics. --- ### 4. Part Number Breakdown The part number follows a standard logic for Allied Components: * **AC30:** Series designation (Axial Lead Inductor, typically 0.15" diameter). * **R18:** Inductance value code (R acts as a decimal; **0.18 µH**). * **K:** Tolerance code (**K = ±10%**). * **RC:** Compliance code (**RoHS Compliant**).