The **SD53-330-R** is a specific model of a surface-mount power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the SD53 series, which is characterized by its shielded construction and low profile. --- ### 1. Key Technical Specifications The part number "SD53-330-R" encodes the primary characteristics of the component: | Parameter | Value | Description | | :--- | :--- | :--- | | **Inductance** | 33 µH | The nominal inductance value. | | **Tolerance** | ±20% | Standard variance from the nominal value. | | **DCR (Direct Current Resistance)** | 0.201 Ω (Typical) | The internal resistance of the copper winding. | | **DC Current (Irms)** | 0.94 A | Current that causes a 40°C temperature rise. | | **Saturation Current (Isat)** | 0.88 A | Current at which inductance drops by 30%. | | **Shielding** | Shielded | Magnetic shielding to reduce EMI. | --- ### 2. Physical Characteristics The "53" in the part number refers to the physical dimensions of the package. * **Dimensions:** Approximately 5.2mm x 5.2mm. * **Height:** 3.0mm (Max). * **Mounting Type:** SMD (Surface Mount Device). * **Core Material:** Ferrite. * **Termination:** Lead-free (indicated by the "-R" suffix for RoHS compliance). --- ### 3. Functional Roles in Circuitry The SD53-330-R is primarily used in power management applications for the following purposes: 1. **Energy Storage:** In DC-DC converters (Buck, Boost, or Buck-Boost), it stores energy in its magnetic field during the switching cycle. 2. **Noise Filtering:** Acts as a low-pass filter to smooth out ripples in current and block high-frequency noise. 3. **EMI Suppression:** Because it is **shielded**, it prevents magnetic flux from leaking and interfering with nearby sensitive components (like radios or microcontrollers). --- ### 4. Common Applications Due to its small footprint and shielded nature, it is typically found in: * **Mobile Devices:** Tablets, smartphones, and handheld gaming consoles. * **Computing:** HDD/SSD power supplies and VRM modules. * **LED Drivers:** Small-scale lighting power stages. * **Industrial:** Low-power sensors and IoT gateways.