The **CW252016-R33J** is a high-frequency, surface-mount (SMD) wire-wound chip inductor. This specific part number follows the standard naming convention used by manufacturers like Bourns or Fastron. ### 1. Part Number Breakdown The nomenclature reveals the core physical and electrical characteristics: | Component Segment | Meaning | Detail | | :--- | :--- | :--- | | **CW** | Series Type | Ceramic Core Wire-wound Inductor | | **252016** | Case Size | Metric dimensions: 2.5 x 2.0 x 1.6 mm (approx. 1008 Imperial) | | **R33** | Inductance Value | 0.33 µH (330 nH) | | **J** | Tolerance | ±5% | --- ### 2. Technical Specifications These components are designed for RF (Radio Frequency) applications where high precision and low loss are required. | Feature | Specification (Typical) | | :--- | :--- | | **Inductance** | 0.33 µH @ 25 MHz | | **Tolerance** | ±5% | | **Quality Factor (Q)** | High (typically >45 at 100 MHz) | | **Self-Resonant Frequency (SRF)** | ~600 MHz | | **DC Resistance (DCR)** | ~0.50 Ω (Max) | | **Rated Current** | ~400 - 500 mA | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Key Electronic Characteristics * **Wire-wound Construction:** Unlike multilayer inductors, the wire-wound design allows for much higher **Q factors** and higher current-carrying capacities. * **Ceramic Core:** The non-magnetic ceramic core provides excellent thermal stability and very high SRF, making it ideal for high-frequency filtering. * **SRF (Self-Resonant Frequency):** At 0.33 µH, this part is optimized for signals below 600 MHz. Beyond this frequency, the component’s parasitic capacitance takes over, and it behaves like a capacitor rather than an inductor. ### 4. Common Applications * **RF Transceivers:** Used in matching circuits for antennas. * **Wireless Communication:** Bluetooth, Wi-Fi, and cellular infrastructure. * **Filtering:** Low-pass or band-pass filters in high-speed signal lines. * **Oscillators:** Frequency generation circuits requiring stable inductance. --- ### 5. Land Pattern (Footprint) The 252016 (1008 Imperial) size is small enough for modern PCB density but large enough for automated pick-and-place machines. ```text PCB Pad Recommendation (mm): [ 0.9 ] <-- Pad Width --- | | (1.2 Gap) | | --- ```