The **TMHC0804SP-R22MN-D** is a high-performance, surface-mount (SMD) power inductor. This component is typically used in power management circuits where high current handling and low core losses are required in a compact footprint. ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's physical and electrical characteristics: | Code Segment | Description | Specific Value | | :--- | :--- | :--- | | **TMHC** | Series Name | High-current shielded power inductor | | **0804** | Case Size | Approx. 8.0mm x 8.0mm x 4.0mm | | **SP** | Construction Type | Specific molding/shielding process | | **R22** | Inductance Value | 0.22 µH (R denotes decimal) | | **M** | Tolerance | ±20% | | **N** | Material/Feature | Specific core material or plating | | **-D** | Packaging/Suffix | Usually denotes Tape & Reel for automated assembly | --- ### 2. Key Technical Specifications Based on the standard parameters for the TMHC series, here are the typical electrical properties for the **R22 (0.22µH)** model: * **Inductance:** 0.22 µH (Measured at 100kHz, 1.0V) * **DC Resistance (DCR):** Extremely low, typically in the range of **1.0mΩ to 1.8mΩ**. This minimizes power loss through heat. * **Saturation Current ($I_{sat}$):** The current at which inductance drops by ~30%. For this size, it is usually between **30A and 45A**. * **Heat Rating Current ($I_{rms}$):** The current that causes a 40°C temperature rise, typically around **25A to 35A**. * **Operating Temperature:** Generally rated for **-40°C to +125°C** (including self-heating). --- ### 3. Construction and Features The device is built using a **Metal Alloy Powder** molding technology, which provides several advantages: 1. **Magnetic Shielding:** The molded construction minimizes electromagnetic interference (EMI) with surrounding components. 2. **Soft Saturation:** Unlike ferrite cores that lose inductance sharply, metal alloy cores have a gradual saturation curve. 3. **Low Buzz Noise:** The solid molded structure reduces acoustic noise caused by magnetostriction. ### 4. Typical Applications This part is designed for high-efficiency DC-DC converters and Point-of-Load (POL) modules: * **Graphics Cards (GPUs):** Voltage regulator modules (VRMs). * **CPUs/Servers:** Multi-phase buck converters. * **Laptops:** High-current power rails. * **Industrial:** High-density power supplies. ---