The **CS321613-R33K** is a surface-mount multi-layer chip inductor. It is commonly used in high-frequency circuits for noise filtering, signal shaping, and impedance matching. --- ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify the physical and electrical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **CS** | Series Type | Multi-layer Chip Inductor (Standard) | | **321613** | Dimensions | Metric size (3.2mm x 1.6mm x 1.3mm) / EIA 1206 | | **R33** | Inductance Value | **0.33 µH** (R denotes the decimal point) | | **K** | Tolerance | **±10%** | --- ### 2. Technical Specifications The typical electrical parameters for this specific component are as follows: * **Inductance:** 0.33 µH * **Case Size:** 1206 (Inch) / 3216 (Metric) * **Tolerance:** ±10% * **Test Frequency:** Usually measured at 25 MHz * **DC Resistance (DCR):** Low (typically < 0.60 Ω) to minimize power loss. * **Rated Current:** Typically ranges between 150mA to 300mA depending on the specific manufacturer. * **Self-Resonant Frequency (SRF):** High frequency (often > 150 MHz). --- ### 3. Key Features & Construction The CS321613 series is built using **Multi-layer Technology**, which offers several advantages: 1. **Magnetic Shielding:** The closed magnetic circuit minimizes crosstalk and electromagnetic interference (EMI) with surrounding components. 2. **Monolithic Structure:** Provides high reliability and excellent solder heat resistance for automated SMT (Surface Mount Technology) assembly. 3. **No Cross-coupling:** Because the magnetic flux is contained within the body, it is ideal for high-density PCB layouts. --- ### 4. Common Applications Due to its 0.33 µH inductance and 1206 form factor, it is frequently used in: * **Filtering:** Removing high-frequency noise in DC power lines. * **RF Circuits:** Impedance matching in wireless communication modules (Bluetooth, Wi-Fi). * **Consumer Electronics:** Used in smartphones, tablets, and computing motherboards. --- ### 5. Equivalent/Alternative Parts If this specific part is unavailable, engineers often look for: * **Murata:** LQH32 series or LQM31 series. * **TDK:** MLZ3216 or MLF3216 series. * **Taiyo Yuden:** HK3216 or LK3216 series.