The **SD18-470-R** is a high-power density, low-profile shielded drum core inductor manufactured by **Eaton (formerly Bussmann/Coiltronics)**. It is widely used in power management circuits due to its compact size and EMI shielding. --- ## 1. Technical Specifications The following table summarizes the core electrical and physical characteristics of the SD18-470-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 47.0 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 0.82 Amps | | **Saturation Current (Isat)** | 0.94 Amps | | **DC Resistance (DCR)** | 0.354 Ohms (Typical) | | **Shielding** | Ferrite Shielded (Low EMI) | | **Package / Case** | SMD (Surface Mount Device) | | **Dimensions** | 5.2mm x 5.2mm x 1.8mm | --- ## 2. Key Features * **Low Profile:** With a height of only 1.8mm, it is ideal for thin electronic devices like smartphones, tablets, and wearable tech. * **Magnetic Shielding:** The ferrite drum core is shielded, which minimizes electromagnetic interference (EMI) with surrounding components. * **High Power Density:** Designed to handle significant current relative to its small footprint. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and meets RoHS environmental standards. --- ## 3. Applications The SD18-470-R is typically found in DC-DC converter circuits where space is a premium: 1. **Buck/Boost Converters:** Used for stepping voltage up or down in battery-powered devices. 2. **LED Drivers:** Provides stable current for backlight displays. 3. **Noise Filtering:** Acts as a low-pass filter to smooth out ripples in power supplies. 4. **Handheld Electronics:** Integrated into GPS units, digital cameras, and portable medical equipment. --- ## 4. Typical Footprint (Dimensions) The component uses a square surface mount footprint to ensure stability during PCB assembly: ```text 5.2 mm +--------------+ | | | (470) | 5.2 mm | | +--------------+ Height: 1.8 mm ```