The **LD1-4R7-R** is a high-performance, surface-mount (SMD) power inductor manufactured by **Eaton (formerly Bussmann/Coiltronics)**. It is part of the LD series, which is designed for high-density power applications. --- ### ## Technical Specifications The following table summarizes the key electrical and physical characteristics of the LD1-4R7-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 4.7 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | ~2.32 Amps | | **Saturation Current (Isat)** | ~2.35 Amps | | **DC Resistance (DCR)** | 0.0528 Ω (Max) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | SMD (Vertical/Drum Core) | | **Shielding** | Non-Shielded | --- ### ### Key Features 1. **Drum Core Construction**: It uses a ferrite drum core which allows for high saturation currents relative to its size. 2. **Compact Footprint**: Designed for high-density circuit boards where space is at a premium. 3. **Low DCR**: The low DC resistance ensures minimal power loss and heat generation during operation. 4. **RoHS Compliant**: The "-R" suffix indicates that the part is lead-free and meets RoHS environmental standards. --- ### ### Applications The LD1-4R7-R is primarily used in power management circuits where voltage needs to be converted or regulated. Common use cases include: * **DC-DC Converters**: Used in "Buck" (step-down) or "Boost" (step-up) converters. * **Battery Powered Devices**: Ideal for laptops, handheld instruments, and mobile electronics. * **Filtering**: Used in input/output filter circuits to reduce electromagnetic interference (EMI) and ripple voltage. * **LED Drivers**: Managing current flow in lighting applications. --- ### ### Typical Circuit Implementation In a standard Buck Converter, the inductor is placed in series with the output to store energy during the switching cycle. ```spice * Simple representation of Inductor in a circuit [Switching Regulator IC] ---- [LD1-4R7-R] ---- [Vout] | [Filter Capacitor] | [GND] ```