## Technical Overview: SRP4020-R22M The **SRP4020-R22M** is a high-current, shielded power inductor manufactured by **Bourns**. It belongs to the SRP4020 series, which is designed for high-density power applications where space and efficiency are critical. --- ### 1. Key Technical Specifications The part number itself contains several encoded specifications: | Parameter | Value | Description | | :--- | :--- | :--- | | **Inductance** | 0.22 µH | Low inductance for high switching frequencies | | **Inductance Tolerance** | ±20% | Denoted by the "M" suffix | | **Irms (Heating Current)** | ~11.5 A | Current causing a 40°C temperature rise | | **Isat (Saturation Current)** | ~14.5 A | Current causing a 30% drop in inductance | | **DCR (DC Resistance)** | 4.2 mΩ (Typical) | Low internal resistance to minimize heat | | **Operating Temp** | -45°C to +125°C | Suitable for industrial and automotive use | --- ### 2. Physical Characteristics This component uses a **metal alloy powder core** rather than a traditional ferrite core. * **Shielding:** It is magnetically shielded, which minimizes Electromagnetic Interference (EMI) with neighboring components. * **Construction:** The molded construction provides high resistance to mechanical shock and vibration. * **Dimensions:** * **Length:** 4.4 mm * **Width:** 4.0 mm * **Height:** 1.8 mm (max 2.0 mm) --- ### 3. Common Applications Due to its low inductance and high current handling, the SRP4020-R22M is typically found in: 1. **DC/DC Converters:** Used in Buck, Boost, and SEPIC topologies. 2. **Consumer Electronics:** Smartphones, tablets, and laptops where PCB space is limited. 3. **Power Modules:** High-frequency VRMs (Voltage Regulator Modules) for CPUs and GPUs. 4. **Telecom Equipment:** Distributed power systems and base stations. --- ### 4. Part Number Breakdown The nomenclature for this series follows a specific logic: ```text SRP 4020 - R22 M | | | | | | | └── Tolerance (M = ±20%) | | └────── Inductance (R22 = 0.22 µH) | └────────────── Dimensions (4.0mm x 2.0mm high) └──────────────────── Series Name (Shielded Power Inductor) ```