The **AA3021LZGSK** is a specialized Surface Mount (SMD) Light Emitting Diode (LED) manufactured by **Kingbright**. It belongs to the "Right Angle" or "Side Looker" category, commonly used in applications where light needs to be projected parallel to the PCB. --- ### ## Technical Specifications The following table outlines the key electrical and optical characteristics of the AA3021LZGSK: | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Kingbright | | **Package / Case** | 3.0mm x 2.0mm (Right Angle SMD) | | **Color** | Green (Emerald Green) | | **Wavelength (Dominant)** | 525 nm | | **Luminous Intensity** | 50 mcd @ 2mA (Low Current Version) | | **Forward Voltage (Vf)** | 2.65V (Typical) | | **Forward Current (If)** | 2 mA (Low Power Consumption) | | **Viewing Angle** | 125° | | **Lens Type** | Water Clear | --- ### ## Key Features 1. **Right Angle Orientation:** The LED is designed to sit flat on a PCB but emit light from the side. This is ideal for edge-lighting LCDs or creating status indicators on the side of a device housing. 2. **Low Current Operation:** The "L" in the part number indicates a **Low Current** version. It operates efficiently at just **2mA**, making it perfect for battery-powered handheld devices where power conservation is critical. 3. **InGaN Material:** It uses Indium Gallium Nitride (InGaN) on Sapphire technology, which provides high brightness and thermal stability. 4. **Moisture Sensitivity:** It is rated at **MSL 3**, meaning it requires proper handling and storage to avoid damage during reflow soldering. --- ### ## Typical Applications * **Backlighting:** Used for small LCD screens or membrane switches. * **Status Indicators:** Side-facing power or connectivity LEDs on consumer electronics (laptops, routers). * **Edge Lighting:** Illuminating light pipes or acrylic panels from the edge. * **Wearables:** Due to its low power consumption (2mA) and small footprint. --- ### ## Circuit Integration Example To use this LED with a 3.3V microcontroller, you must calculate the current-limiting resistor ($R$): ```python # Ohms Law: R = (V_source - V_forward) / I_forward v_source = 3.3 v_forward = 2.65 i_forward = 0.002 # 2mA resistor_value = (v_source - v_forward) / i_forward print(f"Required Resistor: {resistor_value} Ohms") # Result: 325 Ohms (Standard value 330 Ohms) ```