The **CP43B-RGS** is a high-brightness, through-hole Red LED manufactured by **Cree LED** (now part of SGH). It is specifically designed for signage and outdoor display applications. --- ### 1. Key Technical Specifications The following table highlights the primary electronic and optical characteristics of the CP43B-RGS: | Parameter | Specification | | :--- | :--- | | **Color** | Red | | **Dominant Wavelength** | 619nm - 624nm | | **Luminous Intensity** | 2130 - 5860 mcd | | **Viewing Angle** | 30 Degrees | | **Forward Current ($I_F$)** | 50 mA | | **Forward Voltage ($V_F$)** | 2.1V (Typical) / 2.6V (Max) | | **Lens Appearance** | Water Clear | | **Package Type** | 4mm Oval (Radial Through-Hole) | --- ### 2. Component Composition The CP43B-RGS consists of several critical sub-parts that determine its performance: * **LED Die (Chip):** Uses **AlInGaP** (Aluminium Indium Gallium Phosphide) technology, which is the standard for high-efficiency red and amber emitters. * **Epoxy Resin:** The outer "bulb" is made of an optical-grade epoxy that provides UV resistance, crucial for outdoor use to prevent yellowing. * **Lead Frame:** Two metal pins (Anode and Cathode) that provide electrical connectivity and serve as a basic thermal path to dissipate heat. * **Stand-offs:** These are small "shoulders" on the leads that ensure the LED sits at a consistent height above the PCB during soldering. --- ### 3. Usage & Application Notes When integrating the CP43B-RGS into a circuit, consider these electronic constraints: 1. **Current Limiting:** Since LEDs are current-driven devices, a resistor must be placed in series. * *Formula:* $R = (V_{source} - V_F) / I_F$ 2. **Thermal Management:** At 50mA, the device generates heat. Proper spacing on the PCB is required to prevent "thermal runaway" which can shorten the LED's lifespan. 3. **Dimming:** This part is compatible with **Pulse Width Modulation (PWM)** for brightness control, which is the standard method for large-scale LED video walls. --- ### 4. Common Applications * **Electronic Signs:** Full-color or monochrome outdoor signs. * **Traffic Signals:** Stoplights and pedestrian crossings. * **Commercial Displays:** Large-scale advertising billboards.