The **TMPC0312H-R22MG** is a high-performance, surface-mount (SMD) power inductor commonly used in DC-DC converters and high-current power supplies. It belongs to the "Molded Power Inductor" category, known for its compact size and high efficiency. --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Inductance** | 0.22 µH | | **Tolerance** | ±20% (indicated by 'M') | | **Case Size** | 0312 (Approx. 3.5 x 3.2 x 1.2 mm) | | **Rated Current (Irms)** | ~9.0 A (typical rise in temperature) | | **Saturation Current (Isat)** | ~14.5 A (drop in inductance) | | **DC Resistance (DCR)** | ~8.2 mΩ (typical) / 9.5 mΩ (max) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Part Number Breakdown The nomenclature provides specific details about the component's build: * **TMPC**: Series name (usually refers to Shielded Molded Power Inductor). * **0312**: Dimensional code (3.0mm class width/length, 1.2mm height). * **H**: High current or specific material classification. * **R22**: Inductance value (R22 = 0.22 microhenries). * **M**: Tolerance (M = ±20%). * **G**: RoHS compliant / Green (Halogen-free). --- ### 3. Key Features & Construction * **Molded Structure:** The coil is embedded in a metal powdered iron core. This construction provides excellent magnetic shielding and reduces EMI (Electromagnetic Interference). * **Soft Saturation:** Unlike traditional ferrite inductors, molded inductors saturate "gracefully," meaning they don't lose inductance abruptly when current spikes. * **Low DCR:** The use of flat or thick wire reduces DC resistance, minimizing power loss and heat generation. * **Slim Profile:** The 1.2mm height makes it ideal for thin electronic devices like smartphones, tablets, and ultra-books. --- ### 4. Common Applications This part is typically found in high-frequency power circuits where space is limited: 1. **CPU/GPU Power Supply:** Used in VRMs (Voltage Regulator Modules) for laptops. 2. **DC/DC Converters:** Point-of-load (POL) converters. 3. **Battery Powered Devices:** Mobile phones and handheld IoT sensors. 4. **SSD Power Rails:** Providing stable current to high-speed storage drives.