The **MLZ2012E4R7M** is a high-performance multilayer ferrite inductor designed by **TDK Corporation**. It is specifically engineered for use in decoupling circuits and power supply lines, particularly in mobile devices like smartphones and tablets. --- ### 1. Key Technical Specifications | Parameter | Value | Details | | :--- | :--- | :--- | | **Inductance** | 4.7 µH | At 2 MHz frequency | | **Tolerance** | ±20% (M) | Standard industry tolerance | | **Case Size** | 2012 (0805) | 2.0mm x 1.25mm footprint | | **Rated Current** | 120 mA | Maximum continuous current | | **DC Resistance** | 0.30 Ω (Max) | Internal resistance of the coil | | **Self Resonant Freq.** | 50 MHz | Minimum frequency for inductance stability | | **Operating Temp.** | -55°C to +125°C | Automotive/Industrial grade range | --- ### 2. Physical Characteristics * **Structure:** Multilayer Ferrite. Unlike wire-wound inductors, this part is built by layering ferrite material and conductive paste, resulting in a monolithic, compact structure. * **Shielding:** It is **magnetically shielded**, which minimizes electromagnetic interference (EMI) with surrounding components. * **Termination:** Features lead-free (Pb-free) soldering compatibility, typically with a Matte Tin (Sn) finish over Nickel (Ni). --- ### 3. Applications and Usage This specific part number belongs to the **MLZ Series**, which is optimized for "Low DC Resistance" and "High Current" compared to standard signal inductors. * **Decoupling:** Filtering high-frequency noise out of power supply lines for ICs. * **DC/DC Converters:** Small-scale voltage regulation where space is at a premium. * **Audio Lines:** Used to prevent noise interference in speaker or headphone circuits without distorting the signal. --- ### 4. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **MLZ** | Multilayer Inductor for Power Line (Z-series) | | **2012** | Dimensions (Length 2.0mm x Width 1.25mm) | | **E** | Characteristic (Standard / Low Resistance type) | | **4R7** | Inductance Value (4.7 microhenries) | | **M** | Inductance Tolerance (±20%) |