## Overview of KA-3021ZGS The **KA-3021ZGS** is a Surface Mount (SMD) Light Emitting Diode (LED) manufactured by **Kingbright**. It belongs to the subminiature side-looking LED category, specifically designed for applications where space is limited or where light needs to be emitted parallel to the PCB. --- ### Technical Specifications The following table outlines the primary electrical and optical characteristics of the KA-3021ZGS: | Parameter | Specification | | :--- | :--- | | **Emitting Color** | Green | | **Material** | InGaN (Indium Gallium Nitride) | | **Lens Type** | Water Clear | | **Wavelength (Peak)** | 515 nm | | **Luminous Intensity** | 400 - 800 mcd @ 20mA | | **Forward Voltage (Typ)** | 3.3V | | **Viewing Angle** | 120 degrees | | **Package Size** | 3.0mm x 2.0mm x 1.0mm | --- ### Key Features and Construction 1. **Side-Looking Design:** Unlike standard top-mount LEDs, this part is designed as a "Right Angle" SMD. The light is emitted from the side of the component relative to the soldering surface. 2. **InGaN Technology:** The use of Indium Gallium Nitride allows for high brightness and efficiency in the green spectrum compared to older GaP technologies. 3. **Form Factor:** It features a low profile (1.0mm thickness), making it ideal for thin electronic devices like smartphones or wearable tech. 4. **SMT Compatibility:** Designed for automated "pick and place" assembly and compatible with infrared reflow soldering processes. --- ### Typical Applications * **Backlighting:** LCD displays, push-buttons, and switches. * **Status Indicators:** Power/Signal indicators in compact consumer electronics. * **Light Guides:** Coupling light into fiber optics or plastic light pipes. * **Edge Lighting:** Illuminating the edges of glass or acrylic panels. --- ### Wiring Example When integrating the KA-3021ZGS into a circuit (e.g., with a 5V supply), a current-limiting resistor is required. ```python # Calculation for Resistor (R = (V_source - V_forward) / I_forward) V_source = 5.0 # Volts V_forward = 3.3 # Volts I_forward = 0.02 # 20mA expressed in Amps R = (5.0 - 3.3) / 0.02 print(f"Recommended Resistor: {R} Ohms") # Result: 85 Ohms ```