The **LG-008HR-R2** is a specialized electronic component, typically categorized as a **Surface Mount Device (SMD) LED** or an **Infrared/Optical emitter** depending on the specific manufacturer batch, though it is most commonly identified as a high-efficiency **Red LED indicator** in a specific package. Below is a breakdown of its technical specifications and electronic characteristics. --- ### 1. Key Technical Specifications The following table outlines the general electrical and optical characteristics typical for this series: | Parameter | Value (Typical) | Unit | | :--- | :--- | :--- | | **Emitted Color** | Hyper Red / High Efficiency Red | - | | **Peak Wavelength** | 630 - 660 | nm | | **Forward Voltage ($V_f$)** | 1.8 - 2.4 | V | | **Forward Current ($I_f$)** | 20 | mA | | **Luminous Intensity** | 50 - 150 (varies by bin) | mcd | | **Viewing Angle** | 120 - 140 | Degrees | | **Operating Temp** | -40 to +85 | °C | --- ### 2. Component Structure and Materials The "LG" prefix often refers to the manufacturer's series (commonly associated with Lite-On or similar optoelectronic providers). * **Die Material:** Usually **AlGaInP** (Aluminum Gallium Indium Phosphide). This material is chosen for high-brightness red LEDs because of its reliability and efficiency at low voltages. * **Package Type:** It usually features a **0805 or 1206 SMD footprint**. The "R2" suffix often denotes a specific revision of the reel packaging or a slight adjustment in the lens molding (Water Clear vs. Diffused). * **Polarity:** Being a diode, it is polarized. The cathode is usually marked with a green stripe or a notch on the underside of the SMD body. --- ### 3. Application Circuit Example To use this part in a digital circuit (e.g., with a 5V microcontroller), a current-limiting resistor is required. **Formula:** $R = (V_{source} - V_f) / I_f$ ```cpp // Example: Calculating for a 5V supply // V_source = 5V // V_f = 2.0V // I_f = 0.02A (20mA) // Calculation: (5 - 2.0) / 0.02 = 150 Ohms ``` --- ### 4. Common Use Cases * **Status Indicators:** Power-on lights for PCBs, routers, and consumer electronics. * **Backlighting:** Small LCD screens or membrane switches. * **Optical Sensors:** Used as a light source for basic proximity or photo-interrupter circuits.