The **1277AS-H-R68M** is a high-performance, surface-mount (SMD) power inductor commonly used in DC-DC converter applications. It belongs to the **DFE322512C** series manufactured by **Murata Electronics**. --- ## 1. Technical Specifications The part number encodes specific characteristics regarding its size, inductance, and tolerance. | Property | Value | | :--- | :--- | | **Inductance** | 0.68 µH | | **Tolerance** | ±20% (M) | | **DC Resistance (DCR)** | 22 mΩ (Max) / 18 mΩ (Typ) | | **Rated Current (Isat)** | 4.8 A (Based on Inductance change) | | **Rated Current (Itemp)** | 3.9 A (Based on Temperature rise) | | **Operating Temperature** | -40°C to +85°C | | **Case Code (Metric)** | 3225 (3.2mm x 2.5mm) | | **Height** | 1.2 mm (Low profile) | --- ## 2. Key Features * **Metal Alloy Core:** Unlike traditional ferrite inductors, this part uses a metal powder core. This allows for a "soft saturation" characteristic, meaning the inductance drops gradually rather than abruptly as current increases. * **Magnetic Shielding:** The construction is magnetically shielded, which minimizes Electromagnetic Interference (EMI) with surrounding components on the PCB. * **Compact Footprint:** The 1210 (inch) / 3225 (metric) size combined with a 1.2mm height makes it ideal for thin consumer electronics. * **High Efficiency:** Low DC resistance ensures minimal power loss and heat generation during operation. --- ## 3. Common Applications This inductor is primarily used in power management stages for portable electronics: * **Smartphones & Tablets:** For core voltage regulation. * **Wearable Devices:** Due to its small form factor. * **SSD/Storage:** Power rails for flash memory controllers. * **DC-DC Converters:** Buck or Boost converters in space-constrained layouts. --- ## 4. Part Number Breakdown ```text 1277AS - H - R68 M | | | | Series | | +-- Tolerance (M = ±20%) | +------ Inductance (R68 = 0.68µH) +----------- Specific Internal Code/Construction ```