### Overview of the SD12-330-R The **SD12-330-R** is a low-profile, shielded drum core inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the SD series of power inductors designed for high power density and space-constrained applications. --- ### 1. Technical Specifications The primary electronic characteristics define how the component behaves in a circuit: | Parameter | Value | Details | | :--- | :--- | :--- | | **Inductance** | 33.0 µH | Rated at 100 kHz, 0.25 V | | **Tolerance** | ±20% | Standard variance for power inductors | | **DCR (DC Resistance)** | 0.323 Ω | Maximum resistance at 20°C | | **Irms (Rated Current)** | 0.72 A | Current resulting in 40°C temperature rise | | **Isat (Saturation Current)** | 0.77 A | Current resulting in 30% drop in inductance | | **Package Size** | 5.2 x 5.2 x 1.2 mm | Low-profile SMD footprint | | **Shielding** | Yes | Ferrite drum core with integrated shield | --- ### 2. Key Electronic Features * **Magnetic Shielding:** The part is magnetically shielded. This minimizes Electromagnetic Interference (EMI), allowing it to be placed near sensitive components without causing signal noise. * **Low Profile:** The "12" in the part number signifies a height of approximately 1.2mm, making it ideal for mobile devices and thin PCB designs. * **Ferrite Core Material:** Provides high efficiency and high frequency response, though it is subject to saturation (Isat) where the magnetic field can no longer be increased. * **Operating Temperature:** Typically rated for **-40°C to +125°C**, suitable for industrial and consumer electronics environments. --- ### 3. Application Use Cases This component is primarily used for energy storage and filtering in the following scenarios: 1. **DC-DC Converters:** Used in Buck, Boost, and SEPIC converters to smooth out current ripples. 2. **LCD Displays:** Found in the backlight power circuitry of tablets and laptops. 3. **Battery Powered Devices:** Used in smartphones and wearables due to its small footprint and energy efficiency. 4. **Noise Filtering:** Acts as a low-pass filter to remove high-frequency noise from power supply lines. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in selecting variants: | Segment | Meaning | | :--- | :--- | | **SD** | Series Name (Shielded Drum) | | **12** | Size Code (approx. 5.2mm x 1.2mm) | | **330** | Inductance Code (33 + zero zeros = 33 µH) | | **-R** | RoHS Compliant |