The **KA-4008ZGS-E** is a high-performance Surface Mount Device (SMD) LED manufactured by **Kingbright**. It is specifically designed as a Right-Angle (side-looking) LED, which makes it ideal for edge-lighting applications or PCB designs with height constraints. --- ### 1. Key Technical Specifications The following table outlines the primary electrical and optical characteristics of the KA-4008ZGS-E: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Emitted Color** | Green | High-efficiency InGaN technology | | **Wavelength** | 525 nm | Dominant wavelength (True Green) | | **Luminous Intensity** | 400 - 700 mcd | Measured at 20mA | | **Forward Voltage ($V_f$)** | 3.3V (Typ) / 4.1V (Max) | Standard for InGaN Green LEDs | | **Viewing Angle** | 120° | Wide spatial radiation pattern | | **Lens Type** | Water Clear | Maximizes light output | | **Package Size** | 4.0 x 0.8 mm | Ultra-thin side-emitting profile | --- ### 2. Physical Construction and Features * **Right-Angle Design:** Unlike standard top-view LEDs, the light is emitted parallel to the PCB surface. This is achieved through a specific lead frame geometry. * **Material:** Built using **InGaN (Indium Gallium Nitride)** on a Sapphire substrate, which allows for high brightness compared to older GaP green LEDs. * **Moisture Sensitivity:** Typically rated at **Level 3 (MSL 3)**, requiring careful handling regarding humidity before reflow soldering. * **Compliance:** Fully RoHS and REACH compliant, meeting international environmental standards. --- ### 3. Common Applications Due to its unique form factor, this part is frequently used in: 1. **LCD Backlighting:** Edge-lighting for small displays or icons. 2. **Status Indicators:** Side-mounted power or connectivity lights on thin consumer electronics (e.g., smartphones, laptops). 3. **Light Pipes:** Efficient coupling into fiber optic light guides. 4. **Membrane Switches:** Slim interface panels where vertical space is limited. --- ### 4. Typical Connection Diagram When integrating this LED into a circuit, a current-limiting resistor is mandatory. ```cpp // Basic Calculation for 5V Supply // R = (V_supply - V_f) / I_f // R = (5V - 3.3V) / 0.02A = 85 Ohms (Use 100 Ohm for safety) [Power Supply 5V] --- [Resistor 100Ω] --- [Anode LED Cathode] --- [GND] ```