## Technical Overview: SD25-330-R Inductor The **SD25-330-R** is a low-profile, shielded drum core power inductor manufactured by **Eaton (formerly Coiltronics)**. It is part of the SD series, designed for high power density and space-constrained applications. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 33.0 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 1.18 Amps | | **Saturation Current (Isat)** | 1.32 Amps | | **DC Resistance (DCR)** | 0.178 Ohms (Typ) | | **Operating Temp Range** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | | **Package / Case** | 5.2mm x 5.2mm x 2.5mm (SMD) | --- ### 2. Functional Characteristics * **Magnetic Shielding:** The component is shielded, which minimizes Electromagnetic Interference (EMI). This is critical for high-density PCB layouts where components are placed close to sensitive signal lines. * **Low Profile:** With a maximum height of 2.5mm, it is ideal for thin electronic devices like tablets, wearable tech, and handheld instruments. * **Ferrite Core Material:** The drum core construction provides high efficiency and high saturation current levels relative to its size. --- ### 3. Application Use Cases This part is primarily used in power management circuits. Typical applications include: 1. **DC-DC Converters:** Used as the energy storage element in Buck, Boost, or SEPIC converters. 2. **Battery Powered Devices:** Due to its small footprint and efficiency. 3. **LED Drivers:** Providing stable current for lighting applications. 4. **Noise Filtering:** Acts as a low-pass filter for power supply decoupling to reduce ripple voltage. --- ### 4. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **SD** | Series name (Shielded Drum) | | **25** | Size code (approx. 2.5mm height) | | **330** | Inductance value (33 followed by 0 zeros = 33µH) | | **-R** | RoHS compliant / Lead-free | ---