The **1285AS-H-R68M** is a high-current, surface-mount (SMD) power inductor commonly used in DC-DC converter applications. It belongs to the **DFE322512C** series (or similar metal alloy series) often manufactured by companies like **Murata**. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of this component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.68 µH | | **Tolerance** | ±20% (M) | | **DC Resistance (DCR)** | ~16 mΩ (Max) | | **Rated Current (Isat)** | ~5.9 A (Based on inductance change) | | **Rated Current (Itemp)** | ~4.7 A (Based on temperature rise) | | **Case Size (Metric)** | 3225 (3.2mm x 2.5mm) | | **Case Height** | 1.2 mm (Low profile) | | **Core Material** | Metal Alloy (Shielded) | --- ### 2. Breakdown of the Part Number The alphanumeric code follows a specific nomenclature: * **1285AS**: Refers to the internal series designator and physical structure. * **H**: Often indicates the specific material grade or temperature rating. * **R68**: The Inductance value. "R" acts as a decimal point, so $0.68$ microhenries ($\mu H$). * **M**: The tolerance code, representing **±20%**. --- ### 3. Features & Material Composition * **Metal Alloy Construction:** Unlike traditional ferrite inductors, this part uses a molded metal alloy powder. This allows for **Soft Saturation** characteristics, meaning the inductance drops gradually as current increases rather than dropping off sharply. * **Magnetic Shielding:** The molded structure inherently provides magnetic shielding, reducing Electromagnetic Interference (EMI) with surrounding components. * **High Current Density:** Due to its metal core, it can handle significantly higher currents compared to ferrite inductors of the same physical size. --- ### 4. Common Applications This inductor is typically found in compact, high-efficiency power stages: 1. **Smartphones & Tablets:** In CPU/GPU power rails where space is limited. 2. **DC-DC Converters:** Point-of-Load (POL) modules converting battery voltage to lower logic voltages. 3. **Laptops/Portable Electronics:** In ultra-thin devices requiring a profile height of 1.2mm or less. --- ### 5. Summary Pros and Cons * **Pros:** Compact footprint, low profile, high saturation current, low acoustic noise, and excellent EMI shielding. * **Cons:** Higher DC Resistance (DCR) compared to much larger through-hole inductors; metal alloy can be sensitive to extreme thermal cycling if not handled per soldering specs.