The **TMHC1004S-R20MN-D** is a high-current, low-profile molded power inductor typically used in DC-DC converters and power management modules. It is designed to handle high saturation currents while maintaining a compact footprint. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the component's physical and electrical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **TMHC** | Series Name | High-current molded power inductor series. | | **1004** | Dimensions | Approx. 10.0 mm x 11.0 mm (Size) and 4.0 mm (Height). | | **S** | Material/Type | Standard automotive or industrial grade construction. | | **R20** | Inductance Value | **0.20 µH** (R denotes decimal point). | | **M** | Tolerance | **±20%** tolerance on the inductance value. | | **N** | Internal Code | Manufacturer-specific revision or coating code. | | **D** | Packaging | Tape and Reel (usually for automated SMT assembly). | --- ### 2. Key Electrical Specifications While specific values can vary slightly by manufacturer (such as Cyntec or Taiyo Yuden), the general specifications for this part are: * **Inductance:** 0.20 µH * **DC Resistance (DCR):** Extremely low (typically < 1.0 mΩ), which minimizes power loss and heat generation. * **Saturation Current ($I_{sat}$):** Very high (often > 50A). This is the current at which the inductance drops by a specified percentage (usually 30%). * **Heat Rating Current ($I_{rms}$):** The continuous current that causes a specific temperature rise (usually 40°C). * **Operating Temperature:** Generally rated from -55°C to +125°C or +155°C. --- ### 3. Construction & Features The "Molded" designation refers to the manufacturing process: 1. **Metal Powder Core:** Uses a composite iron powder pressed around the copper coil. This provides "soft saturation" characteristics, meaning the inductance doesn't drop off abruptly when current increases. 2. **Shielded Design:** The molded construction naturally acts as a magnetic shield, reducing Electromagnetic Interference (EMI) with neighboring components. 3. **High Reliability:** Designed to withstand high vibration and thermal shock, making it suitable for automotive and high-end industrial applications. --- ### 4. Common Applications * **Voltage Regulator Modules (VRMs):** Used in CPU/GPU power supplies. * **DC-DC Converters:** Point-of-Load (POL) converters for servers and networking. * **Automotive Electronics:** Infotainment, ADAS, and LED lighting drivers. * **Battery Powered Systems:** High-efficiency power paths for portable electronics.