The part number **0603CS-R25XGLW** refers to a high-frequency, wirewound surface-mount (SMD) inductor, typically manufactured by **Coilcraft**. These components are designed for RF (Radio Frequency) applications where high Q-factors and tight tolerances are required. --- ### 1. Part Number Breakdown Understanding each character in the part number helps define its electrical and physical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **0603** | Size Code | Standard EIA footprint (1.6 x 0.8 mm). | | **CS** | Series | Ceramic core, square construction (High Q). | | **R25** | Inductance | **250 nH** (R denotes decimal point in microhenries). | | **X** | Testing | Standard testing / Standard screening. | | **G** | Tolerance | **±2%** (Precision tolerance). | | **L** | Termination | RoHS compliant Silver-Palladium-Platinum-Glass frit. | | **W** | Packaging | 7″ machine-ready embossed tape (typically 2000 per reel). | --- ### 2. Technical Specifications The 0603CS series is known for its exceptional performance in wireless communication devices. | Parameter | Value | | :--- | :--- | | **Inductance** | 250 nH | | **Tolerance** | ±2% | | **Quality Factor (Q) min** | 44 (at 250 MHz) | | **SRF (Self-Resonant Frequency) typ** | 860 MHz | | **DCR (Direct Current Resistance) max** | 1.15 Ohms | | **Irms (Maximum DC Current)** | 350 mA | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Key Features & Construction * **Wirewound Ceramic Core:** Unlike multilayer inductors, the wirewound construction allows for significantly higher **Q-factors**, meaning lower energy loss in RF circuits. * **High Self-Resonant Frequency (SRF):** This allows the inductor to remain inductive at very high frequencies before parasitic capacitance takes over. * **Precision Inductance:** The "G" rating (2%) is ideal for impedance matching and filter circuits where tight specs are critical for performance. --- ### 4. Typical Applications This specific part is widely used in: * **RF Impedance Matching:** Used in the front-end of GPS, Wi-Fi, and LTE modules. * **Filters:** High-pass, low-pass, and band-pass filters for signal processing. * **Oscillators:** Stability in VCOs (Voltage Controlled Oscillators). * **Bluetooth & Zigbee:** Compact wireless communication protocols. ---