The **CM201212-R15KL** is a Surface Mount (SMD) Wire-wound Chip Inductor, typically manufactured by companies like Bourns. It is part of the CM201212 series, designed for high-frequency applications. --- ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify the component's physical and electrical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **CM** | Series Type | Chip Multi-purpose / Wire-wound Inductor | | **201212** | Dimensions | Physical size: 2.0 x 1.2 x 1.2 mm (Metric 2012 / Imperial 0805) | | **R15** | Inductance Value | **0.15 µH** (R denotes the decimal point) | | **K** | Tolerance | **±10%** | | **L** | Termination | Lead-free (RoHS Compliant) | --- ### 2. Key Technical Specifications While specific datasheets may vary slightly by manufacturer, these are the standard parameters for this part: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.15 µH | | **Tolerance** | ±10% | | **Self-Resonant Frequency (SRF)** | ~550 MHz (Minimum) | | **Quality Factor (Q)** | ~30 (at 25.2 MHz) | | **DC Resistance (DCR)** | ~0.44 Ohms (Maximum) | | **Rated Current (I-dc)** | ~300 mA | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Construction and Features * **Wire-wound Core:** Unlike multilayer inductors, this uses a wire wound around a ceramic or ferrite core. This construction allows for higher Q factors and better current handling. * **Form Factor:** It follows the **0805 (Imperial)** footprint, making it compatible with standard automated pick-and-place assembly. * **Durability:** Usually coated with epoxy resin to protect the winding from environmental factors and mechanical stress. --- ### 4. Common Applications Due to its high resonance and stability, the CM201212-R15KL is frequently used in: 1. **RF Circuits:** Matching networks and filters for mobile phones and Wi-Fi modules. 2. **Signal Conditioning:** Noise suppression in high-speed signal lines. 3. **Consumer Electronics:** Power management circuits for small portable devices where space is limited but high performance is required.