The **CTSFW7040F-R22M** is a high-current, surface-mount (SMD) power inductor commonly used in DC-DC converters and high-frequency power supplies. It belongs to the family of **molded power inductors**, which are known for their high saturation currents and low acoustic noise. --- ## 1. Part Number Breakdown The part number follows a specific nomenclature used by manufacturers (typically Central Technologies or similar brands): | Segment | Meaning | Description | | :--- | :--- | :--- | | **CTSFW** | Series Prefix | High-current, shielded molded inductor series. | | **7040** | Dimensions | Approx. 7.0mm x 7.0mm footprint and 4.0mm height. | | **F** | Lead-Free | Compliant with RoHS standards. | | **R22** | Inductance | **0.22 µH** (R denotes the decimal point). | | **M** | Tolerance | **±20%** tolerance on the inductance value. | --- ## 2. Key Technical Specifications Based on standard datasets for this component class, here are the electrical characteristics: | Parameter | Value (Typical) | | :--- | :--- | | **Inductance** | 0.22 µH | | **DC Resistance (DCR)** | ~1.5 mΩ (Max) | | **Saturation Current ($I_{sat}$)** | ~30A to 40A (Current causing 30% drop in L) | | **Heating Current ($I_{rms}$)** | ~20A to 25A (Current causing 40°C rise) | | **Operating Temp** | -55°C to +125°C | --- ## 3. Physical Construction & Features * **Molded Structure:** The coil is encapsulated in a metal iron powder composite. This provides "soft saturation" characteristics, meaning the inductance doesn't drop off instantly when current increases. * **Magnetic Shielding:** The molded body acts as a natural shield, minimizing Electromagnetic Interference (EMI) with surrounding components. * **Low DCR:** The use of flat wire or heavy gauge copper minimizes power loss and heat generation. --- ## 4. Common Applications This specific inductor is designed for high-efficiency power management: 1. **CPU/GPU Power:** Voltage Regulator Modules (VRMs) in laptops and servers. 2. **Point of Load (POL):** High-speed switching converters. 3. **Battery Powered Systems:** Where low DC resistance is critical for battery life. 4. **Automotive Electronics:** Infotainment and ADAS power rails (if AEC-Q200 qualified). ---