The **PM1008-R68K-RC** is a high-frequency, surface-mount (SMD) wire-wound chip inductor. It is commonly used in RF (Radio Frequency) circuits and communication devices for filtering, impedance matching, and resonance. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.68 µH (680 nH) | | **Tolerance** | ±10% (Indicated by 'K') | | **Package Size** | 1008 (2.5 mm x 2.0 mm) | | **Core Material** | Ceramic (High Q Factor) | | **Maximum DC Current** | ~450 mA | | **DC Resistance (DCR)** | ~0.75 Ohms (Max) | | **Self-Resonant Frequency (SRF)** | ~375 MHz | --- ### 2. Breakdown of the Part Number Understanding the coding helps in selecting alternatives or verifying the component: * **PM1008**: Refers to the series and physical size. "1008" corresponds to dimensions of 0.10 x 0.08 inches. * **R68**: The inductance value. "R" acts as a decimal point. $0.68\mu H$. * **K**: The tolerance code. $K = \pm 10\%$. * **RC**: Denotes that the part is **RoHS Compliant**. --- ### 3. Electronic Characteristics & Applications Because this inductor uses a **ceramic core** rather than a ferrite core, it behaves differently in electronic circuits: #### A. High Q Factor The ceramic core provides a high "Quality Factor," meaning it has very low energy loss at high frequencies. This makes it ideal for: * **RF Oscillators:** Maintaining stable frequencies. * **Filters:** Creating sharp "cut-off" points in signal processing. #### B. High Self-Resonant Frequency (SRF) The SRF is the point where the inductor starts behaving like a capacitor due to parasitic capacitance. With an SRF of 375 MHz, this part is safe to use in applications ranging from FM radio bands up to lower UHF frequencies. #### C. Typical Use Cases * **Mobile Communications:** Cellular base stations and handsets. * **Wireless LAN:** Wi-Fi modules and Bluetooth circuitry. * **Broadband Infrastructure:** Modems and routers. --- ### 4. Mounting and Handling * **Footprint:** Standard 1008 SMD pads. * **Soldering:** Compatible with lead-free reflow soldering profiles. * **Orientation:** Wire-wound inductors can sometimes have polarity sensitivities in extremely high-precision RF paths due to magnetic coupling, though they are generally considered non-polar.