The **CSS075D-331** is a specific electronic component, typically categorized as a **Surface Mount (SMD) Power Inductor**. Components with this naming convention are often manufactured by companies like Sumida or are part of standardized industrial series for high-current power applications. --- ## 1. Part Number Breakdown The nomenclature usually follows a standard industry logic: | Segment | Meaning | Details | | :--- | :--- | :--- | | **CSS** | Series Prefix | Often denotes a shielded surface mount inductor series. | | **075** | Physical Size | Typically indicates dimensions (e.g., ~7.0mm x 7.5mm). | | **D** | Modification/Style | Refers to a specific height profile or internal construction. | | **331** | Inductance Value | **330 µH** (33 followed by 1 zero, measured in microhenries). | --- ## 2. Technical Specifications While exact specs can vary by brand, a standard **331 (330µH)** inductor in this form factor generally features the following characteristics: ### Electrical Properties * **Inductance:** 330 µH (Tolerance is usually ±20% or M). * **DC Resistance (DCR):** Relatively high compared to lower-value inductors (often in the range of 1.0Ω to 2.5Ω). * **Rated Current:** Typically ranges between **0.2A to 0.6A** depending on the specific core material. * **Operating Temperature:** Generally -40°C to +125°C. ### Physical Construction * **Shielding:** Most "CSS" series are **magnetically shielded**, which reduces electromagnetic interference (EMI) with neighboring components. * **Core Material:** Ferrite core. * **Terminations:** Lead-free (RoHS compliant) tin-plated pads for SMD reflow soldering. --- ## 3. Common Applications This part is used in circuits requiring energy storage or signal filtering: 1. **DC-DC Converters:** Used in "Buck" or "Boost" converters to smooth output current. 2. **LED Drivers:** Helps maintain constant current for lighting arrays. 3. **Noise Filtering:** Acts as a low-pass filter in power supply lines to block high-frequency noise. 4. **Consumer Electronics:** Found in tablets, laptops, and portable power banks. --- ## 4. Comparison Table (CSS075D Series) | Part Number | Inductance (µH) | Typical DCR (Max) | Rated Current (Approx) | | :--- | :--- | :--- | :--- | | CSS075D-100 | 10 | 0.08 Ω | 2.30 A | | CSS075D-101 | 100 | 0.60 Ω | 0.75 A | | **CSS075D-331** | **330** | **1.80 Ω** | **0.40 A** | --- ### Engineering Note When replacing this part, ensure the **Saturation Current ($I_{sat}$)** of the replacement meets or exceeds the original requirements. If the current through the inductor exceeds this limit, the inductance will drop sharply, potentially causing circuit failure.