The **MLZ2012M4R7HTD25** is a high-performance multilayer chip inductor manufactured by **TDK Corporation**. It is specifically designed for use in decoupling and power supply circuits, particularly in mobile devices and automotive infotainment systems. --- ### 1. Technical Specifications The following table highlights the core electrical and physical parameters of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 4.7 µH | | **Tolerance** | ±20% | | **DC Resistance (Max)** | 0.39 Ω | | **Rated Current** | 450 mA | | **Self-Resonant Frequency** | 60 MHz | | **Operating Temperature** | -55°C to +125°C | | **Case Size (EIA/Metric)** | 0805 / 2012 (2.0mm x 1.25mm) | | **Structure** | Multilayer / Ferrite Core | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying the specific features of this series: * **MLZ**: Series Name (Multilayer Inductor for Power Circuits). * **2012**: Dimensions (2.0mm length x 1.25mm width). * **M**: Characteristic type (Standard type for high-frequency decoupling). * **4R7**: Inductance value (4.7 microhenries). * **H**: Tolerance (±20% typically, though 'H' specifically refers to the packaging or characteristic variation in TDK's MLZ lineup). * **T**: Packaging (Taping / Reel). * **D25**: Internal control code or specific thickness/design variant. --- ### 3. Key Features & Applications #### Features * **Magnetic Shielding:** The multilayer ferrite structure prevents magnetic flux leakage, reducing Electromagnetic Interference (EMI) with neighboring components. * **High Current Handling:** Compared to standard signal-line inductors, the MLZ series is optimized to handle higher DC currents without saturating. * **Durability:** The "HT" variants are often rated for higher temperature reliability, making them suitable for demanding environments. #### Applications * **Smartphones & Tablets:** Used in the power management unit (PMU) for decoupling DC lines. * **Automotive Infotainment:** Ideal for noise suppression in car audio and navigation displays. * **Communication Modules:** Filtering noise in Bluetooth, Wi-Fi, and LTE modules. --- ### 4. Comparison with Standard Inductors Unlike standard wire-wound inductors, this multilayer chip inductor offers a much smaller footprint and better automated assembly compatibility: ```yaml Comparison: Wire-Wound: Higher Q-factor, larger size, higher cost. Multilayer (MLZ): Compact 0805 size, lower profile, excellent for mass production. ```