The part number **47LAC-252G-R** refers to a high-frequency, surface-mount (SMD) wire-wound inductor, typically used in radio frequency (RF) and telecommunications applications. --- ### 1. Key Technical Specifications Based on standard naming conventions for this series (often associated with manufacturers like **Abracon** or **Coilcraft** alternatives), here are the primary technical parameters: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 2.5 µH (Microhenries) | | **Tolerance** | ±2% (indicated by the 'G' suffix) | | **Package / Case** | 0402 or 0603 size (Series dependent) | | **Core Material** | Ceramic (for high-frequency stability) | | **Mounting Type** | Surface Mount (SMD/SMT) | | **RoHS Status** | Compliant (indicated by the 'R' suffix) | --- ### 2. Detailed Breakdown of Part Number The alphanumeric code can be decoded as follows: * **47LAC**: The series identifier. This usually specifies the physical size and the wire-wound construction style. * **252**: The inductance code. * The first two digits (**25**) are significant figures. * The third digit (**2**) is the multiplier ($10^2$). * $25 \times 100 = 2500$ nH, which equals **2.5 µH**. * **G**: The tolerance code. **G** represents **±2%**, which is a high-precision rating for an inductor. * **R**: Indicates **RoHS Compliance** (Lead-free) or Reel packaging. --- ### 3. Application and Usage Because this part is a wire-wound inductor with a high-Q factor and tight tolerance, it is used in: 1. **Impedance Matching**: Ensuring maximum power transfer in RF circuits. 2. **Filtering**: Low-pass, high-pass, or band-pass filters in wireless communication. 3. **Resonant Circuits**: Used in oscillators and tuning circuits where precision is critical. 4. **RF Choking**: Blocking high-frequency noise while allowing DC to pass. --- ### 4. Sample Code: Calculating Inductive Reactance If you are designing a circuit with this component, you may need to calculate its reactance ($X_L$) at a specific frequency: ```python import math def calculate_reactance(inductance_uh, frequency_mhz): # Convert units to Henrys and Hertz L = inductance_uh * 1e-6 f = frequency_mhz * 1e6 # Formula: Xl = 2 * pi * f * L reactance = 2 * math.pi * f * L return reactance inductance = 2.5 # 252G = 2.5uH freq = 10.0 # 10 MHz xl = calculate_reactance(inductance, freq) print(f"Reactance at {freq} MHz: {xl:.2f} Ohms") ```