The **CTMPH080504F-R47M** is a high-performance, surface-mount (SMD) power inductor. This specific component is part of the **Metal Powder** inductor series, designed for high-current applications where efficiency and space-saving are critical. Below is a detailed breakdown of its specifications and characteristics. ### 1. Technical Specifications | Parameter | Value | Description | | :--- | :--- | :--- | | **Inductance** | 0.47 µH | The nominal inductance value. | | **Tolerance** | ±20% (M) | The allowable variance from the nominal inductance. | | **Case Size** | 0805 (2012 metric) | Dimensions: approx. 2.0mm x 1.25mm. | | **Height** | 0.4mm (Max) | Ultra-low profile design. | | **DC Resistance (DCR)** | ~21 mΩ (Typ) | Internal resistance; lower values reduce heat loss. | | **Isat (Saturation Current)** | ~4.2 A | Current at which inductance drops by 30%. | | **Irms (Rated Current)** | ~3.5 A | Current based on temperature rise (usually 40°C). | --- ### 2. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical limits: * **CTMPH**: Series code for **Central Technologies** Metal Powder High-current inductors. * **0805**: Physical footprint (0.08 x 0.05 inches). * **04**: Max height code (0.4mm). * **F**: RoHS compliant/Lead-free. * **R47**: Inductance value (R = decimal point, so 0.47 microhenries). * **M**: Tolerance code (M = ±20%). --- ### 3. Key Electronic Characteristics #### A. Metal Powder Core Technology Unlike traditional ferrite inductors, metal powder cores offer a **"Soft Saturation"** characteristic. This means that as current increases, the inductance drops gradually rather than abruptly. This prevents sudden circuit failure during current spikes. #### B. Ultra-Low Profile At only 0.4mm high, this part is specifically engineered for "thinner-than-standard" electronics, such as smartphones, wearable devices, and slim IoT sensors. #### C. High Current Density Despite its small size (0805), it can handle relatively high currents (up to 4A range), making it ideal for Point-of-Load (POL) DC-DC converters. --- ### 4. Common Applications * **DC/DC Converters:** Voltage regulation in battery-powered devices. * **Mobile Devices:** Power management for CPUs and GPUs in smartphones. * **SSD/Storage:** Power filtering for high-speed data drives. * **Wearables:** Smartwatches and health monitors where PCB height is restricted. ---