The **SRP1040-R20M** is a high-current, shielded power inductor manufactured by Bourns. It is designed for applications requiring high efficiency and reliability in power conversion circuits. ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 0.20 µH | | **Tolerance** | ±20% | | **Inductance Code** | R20 | | **Irms (Heating Current)** | 35.0 A | | **Isat (Saturation Current)** | 60.0 A | | **DCR (DC Resistance)** | 0.85 mΩ (Max) | | **Operating Temperature** | -40 °C to +150 °C | | **Package Size** | 10.0 x 11.5 x 4.0 mm | --- ### 2. Core Features and Construction * **Shielded Construction:** The inductor is magnetically shielded, which minimizes electromagnetic interference (EMI) and prevents noise from affecting surrounding components. * **Metal Alloy Powder Core:** It utilizes a carbonyl powder core technology. This allows for high saturation currents and ensures a "soft" saturation characteristic (the inductance drops gradually rather than abruptly as current increases). * **Flat Wire Technology:** The internal winding uses flat copper wire. This reduces the DC resistance (DCR) and minimizes the skin effect, leading to lower power losses and better thermal management. * **AEC-Q200 Compliance:** Most versions of the SRP1040 series are automotive grade, meaning they are tested for high vibration and extreme temperature cycles. --- ### 3. Pinout and Footprint The SRP1040 is a **Surface Mount Device (SMD)**. The "1040" naming convention refers to its physical dimensions: * **Length:** ~11.5 mm * **Width:** ~10.0 mm * **Height:** ~4.0 mm --- ### 4. Typical Applications The SRP1040-R20M is primarily used in high-frequency DC/DC converters. Because of its 0.20 µH value and massive 60A saturation current, it is ideal for: 1. **Voltage Regulator Modules (VRMs):** Powering CPUs and GPUs in servers. 2. **Automotive Systems:** Driver assistance systems (ADAS) and infotainment power rails. 3. **Battery Management Systems (BMS):** High-current charging circuits. 4. **Distributed Power Systems:** Point-of-Load (POL) converters. --- ### 5. Part Number Breakdown ```text SRP 1040 - R20 M | | | | | | | +-- Tolerance (M = ±20%) | | +----- Inductance Value (R20 = 0.20 µH) | +----------- Size Dimensions (10 x 4.0 mm) +---------------- Series Name (Shielded Power Inductor) ```