The **CTCDRH104F-331M** is a specific model of a **Shielded Surface Mount (SMD) Power Inductor**. These components are widely used in power management circuits to store energy in a magnetic field and filter noise. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **CT** | Manufacturer Prefix | Central Technologies | | **CDRH** | Series Type | Magnetically shielded drum core inductor | | **104** | Dimensions | Approx. 10.1mm x 10.1mm x 4.0mm | | **F** | Lead-Free | RoHS compliant / Lead-free construction | | **331** | Inductance Value | 330 µH (33 + one zero) | | **M** | Tolerance | ±20% | --- ### 2. Key Technical Specifications Based on the standard datasheet for the 104F series, here are the technical parameters for the **331M** variant: * **Inductance:** 330 µH (Microhenries) * **Tolerance:** ±20% * **DC Resistance (DCR):** Typically around 0.70 – 0.95 Ω (Max). This represents the resistance of the copper wire inside. * **Rated Current (Isat/Irms):** Usually rated between 0.5A to 0.7A depending on the specific temperature rise or saturation limits. * **Operating Temperature:** -40°C to +125°C (including self-temperature rise). --- ### 3. Core Features * **Magnetic Shielding:** The "CDRH" design includes a ferrite shield. This minimizes Electromagnetic Interference (EMI), preventing the magnetic field from interfering with neighboring components on the PCB. * **Low Profile:** The "104" size is designed for height-sensitive applications (4.0mm max height). * **High Energy Storage:** Suitable for DC-to-DC conversion due to its core material properties. --- ### 4. Common Applications This specific inductor value (330 µH) is commonly found in: 1. **DC/DC Converters:** Step-up (Boost) or Step-down (Buck) regulators. 2. **Power Supplies:** Filtering stages for LCD televisions, notebooks, and network equipment. 3. **Battery Powered Devices:** Where efficiency and low EMI are critical. ---