The **SD10-4R7-R** is a high-performance, low-profile surface mount (SMD) power inductor. It is part of the SD series manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. --- ### 1. Technical Specifications The following table highlights the primary electrical and physical characteristics of the SD10-4R7-R: | Parameter | Value | Details | | :--- | :--- | :--- | | **Inductance** | 4.7 µH | Nominal inductance at 100 kHz | | **Tolerance** | ±20% | Standard industry tolerance | | **DC Resistance (DCR)** | 0.126 Ω | Maximum internal resistance | | **Rated Current (Irms)** | 1.48 A | Current for 40°C temperature rise | | **Saturation Current (Isat)** | 1.18 A | Current for 30% drop in inductance | | **Shielding** | Shielded | Magnetic shielding to reduce EMI | | **Package Size** | 5.2 x 5.2 x 1.0 mm | Extremely low profile (1.0 mm height) | --- ### 2. Component Composition The SD10-4R7-R is engineered for efficiency in compact spaces: * **Core Material:** Ferrite core, which offers high efficiency and low core losses at high frequencies. * **Shielding:** The component is magnetically shielded, making it ideal for high-density boards where electromagnetic interference (EMI) between components must be minimized. * **Terminations:** Matte tin over copper, ensuring excellent solderability for RoHS-compliant processes. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying variants: | Segment | Meaning | | :--- | :--- | | **SD** | Series Name (Standard Inductor) | | **10** | Size Code (Refers to the 1.0 mm height) | | **4R7** | Inductance Value (4.7 µH, where 'R' acts as decimal) | | **-R** | RoHS Compliant / Lead-Free | --- ### 4. Common Applications Due to its low profile and shielded nature, this inductor is commonly found in: * **Mobile Devices:** Smartphones, tablets, and wearables where vertical space is limited. * **DC-DC Converters:** Buck, boost, and SEPIC topologies. * **LCD Displays:** Backlight drivers and panel power supplies. * **Portable Medical Equipment:** Small-scale diagnostic tools.