The **KPAU-B2MA-R** is a specific surface-mount (SMD) electronic component, typically categorized as a **Right-Angle Top-View Chip LED**. It is widely used in compact consumer electronics for status indication and backlighting. --- ### 1. Technical Specifications Below are the primary electrical and optical characteristics for this component: | Parameter | Specification | | :--- | :--- | | **Emitted Color** | Red | | **Wavelength** | ~624 nm (Typical) | | **Forward Voltage ($V_F$)** | 2.0V (Typical) / 2.4V (Max) | | **Forward Current ($I_F$)** | 20mA (Standard Operating) | | **Luminous Intensity** | 120 - 250 mcd | | **Viewing Angle** | 120 Degrees | | **Package Type** | 3.0mm x 2.0mm (Right-Angle SMD) | --- ### 2. Key Internal Components The part is composed of several critical electronic materials that determine its performance: 1. **LED Die (AlGaInP):** The semiconductor material used is Aluminum Gallium Indium Phosphide. This material is chosen for high-efficiency red light emission. 2. **Lead Frame:** Usually silver-plated copper, providing the electrical connection and helping with thermal dissipation. 3. **Encapsulation:** A clear or water-clear epoxy/silicone resin that protects the die while allowing maximum light transmission. 4. **Polarity Mark:** A notch or green line on the cathode side to ensure correct orientation during PCB assembly. --- ### 3. Application Use Cases Because of its **Right-Angle** orientation, the light is emitted parallel to the PCB surface rather than perpendicular. This makes it ideal for: * **Edge Lighting:** Illuminating the edge of a plastic housing or light pipe. * **Backlighting:** Providing light for LCD screens or membrane switches in tight spaces. * **Status Indicators:** Small LEDs on the side of a device (e.g., charging ports, power buttons). --- ### 4. Circuit Implementation When designing a circuit for the KPAU-B2MA-R, a current-limiting resistor is required to prevent burnout. **Example Calculation (for a 5V system):** ```text R = (V_source - V_forward) / I_forward R = (5.0V - 2.0V) / 0.02A R = 150 Ohms ```