The **TMHC0804SP-R68MN-D** is a high-current, low-profile power inductor typically used in DC-DC converter applications. It is designed to handle high frequency and high saturation currents within a compact surface-mount footprint. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **TMHC** | Series Name | High-current shielded power inductor series | | **0804** | Case Size | Approx. 8.0 x 8.0 mm (Footprint) x 4.0 mm (Height) | | **SP** | Construction | Shielded type with iron powder core | | **R68** | Inductance Value | **0.68 µH** (R denotes decimal point) | | **M** | Tolerance | **±20%** | | **N-D** | Packaging/Suffix | Standard internal code or reel packaging type | --- ### 2. Key Technical Specifications While exact values can vary slightly by manufacturer (often associated with brands like Taiyo Yuden or similar high-quality magnetic component makers), typical specs for this part include: * **Inductance:** 0.68 µH * **DC Resistance (DCR):** Extremely low (typically < 3.0 mΩ) to minimize power loss. * **Saturation Current ($I_{sat}$):** High capacity, usually ranging from **20A to 30A** (the current at which inductance drops by ~30%). * **Heating Current ($I_{rms}$):** The current that causes a 40°C temperature rise, usually around **15A to 22A**. * **Operating Temperature:** -40°C to +125°C (including self-heating). --- ### 3. Core Features & Construction 1. **Shielded Design:** The inductor is magnetically shielded. This reduces Electromagnetic Interference (EMI), preventing the magnetic field from interfering with neighboring components on the PCB. 2. **Metal Alloy/Iron Powder Core:** Unlike traditional ferrite cores, these use a composite metal powder. This allows for **"Soft Saturation"**—where the inductance drops gradually rather than abruptly when current increases. 3. **Low DCR:** The use of thick copper wire ensures minimal energy is wasted as heat, making it ideal for high-efficiency power supplies. --- ### 4. Common Applications This part is commonly found in the following circuits: * **Voltage Regulator Modules (VRMs):** For CPUs and GPUs in laptops or servers. * **DC-DC Buck Converters:** Stepping down voltage in battery-powered devices. * **Automotive Electronics:** Infotainment systems or ADAS sensors requiring stable power. * **Industrial Power Supplies:** High-density power modules.