The **PM0805-R22K** is a specific part number for a surface-mount inductor. Based on standard electronic component naming conventions (specifically those used by manufacturers like Bourns), here is the detailed breakdown of its technical specifications. ### 1. Part Number Deciphering The alphanumeric code provides the key specifications for the component: | Segment | Meaning | Value | | :--- | :--- | :--- | | **PM** | Series Prefix | Standard Wirewound Chip Inductor | | **0805** | Package Size | 0.08 x 0.05 inches (2.0 x 1.25 mm) | | **R22** | Inductance Value | 0.22 µH (Microhenries) | | **K** | Tolerance | ±10% | --- ### 2. Technical Specifications This component is typically a **wirewound inductor** designed for high-frequency applications. * **Inductance:** 220 nH (nanhenries) / 0.22 µH. * **Tolerance:** ±10%. * **Case Size:** 0805 (EIA standard). * **Quality Factor (Q):** Usually high (typically 25-40 min at specific frequencies), making it efficient for RF tuning. * **Self-Resonant Frequency (SRF):** High SRF (often above 450 MHz), allowing it to maintain inductive properties at high speeds. * **Current Rating (I-dc):** Generally ranges between 250mA to 500mA depending on the specific manufacturer's revision. --- ### 3. Material and Construction * **Core Material:** Usually a ceramic or ferrite core. Ceramic cores are preferred for high-frequency stability, while ferrite offers higher inductance in smaller packages. * **Termination:** Lead-free (RoHS compliant) matte tin over nickel plating. * **Wire:** Copper wire wound around the core, often encapsulated in epoxy for protection. --- ### 4. Typical Applications The PM0805-R22K is commonly found in the following circuits: 1. **RF Communication:** Matching networks and filters for Bluetooth, Wi-Fi, and cellular modules. 2. **Signal Conditioning:** Decoupling and EMI suppression in high-speed data lines. 3. **Oscillators:** Frequency determination in LC circuits. --- ### 5. Footprint (0805 Metric 2012) The physical dimensions are critical for PCB design: | Dimension | Measurement (mm) | Measurement (inches) | | :--- | :--- | :--- | | **Length** | 2.00 ± 0.20 | 0.079 ± 0.008 | | **Width** | 1.25 ± 0.20 | 0.049 ± 0.008 | | **Height** | 1.20 ± 0.20 | 0.047 ± 0.008 | ---