The **LD1-1R4-R** is a high-current, surface-mount (SMT) power inductor. It belongs to the **LD Series** manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). These components are designed for high-density power applications where space is limited but high current handling is required. --- ### 1. Key Technical Specifications The part number "1R4" indicates the inductance value. Below are the typical technical parameters for this specific component: | Parameter | Value | | :--- | :--- | | **Inductance** | 1.4 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | ~4.7 Amps (Typical) | | **Saturation Current (Isat)** | ~5.8 Amps (Typical) | | **DC Resistance (DCR)** | ~0.024 Ohms (24 mΩ) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | LD1 Size (approx. 6.1mm x 4.5mm) | --- ### 2. Physical Characteristics & Construction * **Shielding:** This is a **shielded** inductor. The construction uses a ferrite drum core with a sleeve or resin-epoxy coating to contain the magnetic field, which reduces Electromagnetic Interference (EMI) with neighboring components. * **Mounting:** Designed for Surface Mount Technology (SMT). It features flat bottom pads for stable soldering. * **Material:** It uses a high-performance ferrite core material that maintains efficiency even at higher frequencies. --- ### 3. Applications The LD1-1R4-R is primarily used in power management circuits where voltage needs to be stepped up or down efficiently. * **DC-DC Converters:** Buck, Boost, and SEPIC topologies. * **Voltage Regulator Modules (VRMs):** Used in computing and telecommunications. * **Portable Electronics:** Tablets, handheld GPS, and mobile power banks. * **Filtering:** Used as an output filter to smooth ripples in switching power supplies. --- ### 4. Part Number Breakdown Understanding the Eaton/Coiltronics nomenclature: | Code Segment | Meaning | | :--- | :--- | | **LD1** | Series size/dimension (6.1 x 4.5 x 3.1mm) | | **1R4** | Inductance value (1.4 microhenries) | | **-R** | RoHS compliant (Lead-free) | ---