The **SD25-102-R** is a high-power, shielded surface-mount (SMD) inductor manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the SD25 series, known for its low profile and high energy storage capabilities. --- ### ## Technical Specifications Below are the primary electrical and physical characteristics of the SD25-102-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 1.0 mH (1000 µH) | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~2.56 Ohms (Typical) | | **Rated Current (Irms)** | 0.231 Amps | | **Saturation Current (Isat)** | 0.283 Amps | | **Shielding** | Magnetically Shielded | | **Operating Temperature** | -40°C to +125°C | | **Dimensions** | 5.2mm x 5.2mm x 2.5mm | --- ### ### Key Features 1. **Magnetic Shielding:** The component is shielded, which minimizes Electromagnetic Interference (EMI). This is critical for densely packed circuit boards where noise can affect nearby sensitive components. 2. **Ferrite Core Construction:** It utilizes a ferrite drum core with a ferrite sleeve, providing high efficiency and stable performance across a wide temperature range. 3. **Compact Profile:** With a height of only 2.5mm, it is ideal for "slim" electronic devices like handheld portables or thin IoT modules. 4. **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and meets RoHS environmental standards. --- ### ### Common Applications The SD25-102-R is typically used in power management circuits where high inductance is required in a small footprint: * **DC-DC Converters:** Used as an energy storage element in buck, boost, or buck-boost regulators. * **LED Drivers:** Provides constant current smoothing for high-brightness LEDs. * **Battery Powered Equipment:** Ideal for tablets, smartphones, and wearable tech due to its low power loss. * **Filtering:** Acts as a low-pass filter to remove high-frequency noise from power supply lines. --- ### ### Identification Code Breakdown ```text SD 25 - 102 - R | | | | | | | └── RoHS Compliant | | └────── Inductance Code (10 + 2 zeros = 1000µH / 1mH) | └─────────── Size Series (approx. 5.2mm x 5.2mm x 2.5mm) └──────────────── Product Series (Shielded Drum) ```