## SRP4020-R36M Technical Overview The **SRP4020-R36M** is a high-current shielded power inductor manufactured by Bourns. It is part of the SRP4020 series, designed primarily for DC/DC converter applications where high efficiency and compact size are required. --- ### 1. Key Technical Specifications The model number "R36M" encodes the specific electrical characteristics of the component. | Parameter | Specification | Notes | | :--- | :--- | :--- | | **Inductance** | 0.36 µH | Measured at 100 kHz / 1V | | **Tolerance** | ±20% | Indicated by the "M" suffix | | **Irms (Heating Current)** | 12 A | Current causing a 40°C temp rise | | **Isat (Saturation Current)** | 15 A | Current causing 30% drop in inductance | | **DCR (DC Resistance)** | 6.3 mΩ (Max) | Internal resistance of the coil | | **Operating Temperature** | -45°C to +125°C | Includes self-heating | --- ### 2. Component Construction & Features * **Shielded Structure:** The inductor is magnetically shielded using a carbonyl powder core. This minimizes Electromagnetic Interference (EMI) and prevents the magnetic field from affecting surrounding components. * **Low Profile:** The "4020" designation refers to its physical footprint: approximately **4.45 mm x 4.0 mm** with a height of **2.0 mm**. * **High Saturation Current:** Unlike traditional ferrite inductors, the metal powder core provides a "soft" saturation characteristic, meaning it handles current spikes without a sudden loss of inductance. * **AEC-Q200 Compliance:** Most parts in this series are qualified for automotive applications, ensuring high reliability under thermal shock and vibration. --- ### 3. Common Applications The SRP4020-R36M is typically found in high-frequency power circuits including: 1. **Voltage Regulator Modules (VRMs):** Used in laptops and servers to step down voltage for CPUs/GPUs. 2. **DC/DC Converters:** Core component in buck or boost converters. 3. **Battery Powered Devices:** Ideal for smartphones or tablets due to high efficiency and small size. 4. **LED Lighting:** Used in driver circuits to maintain steady current. --- ### 4. Part Number Breakdown The part number follows a specific nomenclature: * **SRP:** Product Series (Shielded Power Inductor). * **4020:** Size dimensions (4.0mm width / 2.0mm height). * **R36:** Inductance value (R = decimal point; 0.36 Microhenries). * **M:** Tolerance (±20%).