## Overview of DRQ125-151-R The **DRQ125-151-R** is a high-power, shielded dual-winding inductor (coupled inductor) manufactured by Eaton (formerly Bussmann). It belongs to the **DRQ series**, which is designed for applications requiring high efficiency and compact footprints. --- ### Technical Specifications The following table summarizes the primary electrical and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 150 µH (nominal) | | **Inductance Tolerance** | ±20% | | **DC Resistance (DCR)** | 352 mΩ (max per winding) | | **Isat (Saturation Current)** | 1.83 A | | **Irms (Rated Current)** | 1.25 A | | **Configuration** | Dual Winding (Coupled) | | **Mounting Type** | Surface Mount (SMD) | | **Operating Temperature** | -40°C to +125°C | --- ### Key Features 1. **Dual Winding Design:** It contains two identical windings that can be connected in series or parallel. This provides flexibility for different voltage or current requirements. 2. **Magnetic Shielding:** The part is magnetically shielded to minimize Electromagnetic Interference (EMI), making it suitable for noise-sensitive circuits. 3. **High Power Density:** Despite its small size (approx. 12.5mm x 12.5mm), it handles significant current and energy storage. 4. **Halogen Free & RoHS Compliant:** Meets modern environmental safety standards. --- ### Common Applications The DRQ125-151-R is versatile and commonly found in the following power electronics configurations: * **SEPIC Converters:** Used as a coupled inductor to simplify the design and improve efficiency. * **Flyback Transformers:** Can act as a 1:1 transformer for isolated power supplies. * **Buck/Boost Converters:** Used for energy storage in DC-DC conversion. * **Common Mode Chokes:** Can be wired to filter out high-frequency noise in power lines. --- ### Connection Schematics Depending on your circuit needs, the two windings (Pin 1-2 and Pin 3-4) can be utilized as follows: ```text Parallel Connection: - Connect Pin 1 to Pin 3 (Input) - Connect Pin 2 to Pin 4 (Output) - Result: Lower DCR, Higher Current, Same Inductance (150µH) Series Connection: - Connect Pin 2 to Pin 3 - Use Pin 1 and Pin 4 as terminals - Result: 4x Inductance (600µH), Higher DCR, Same Saturation ```