The **C4SMG-RJS-CS14QBB1** is a high-brightness, oval, through-hole LED manufactured by **Cree LED** (now part of SGH). It is specifically designed for outdoor electronic signs and signals. --- ### 1. Technical Specifications Below are the primary electrical and optical characteristics for this specific part number: | Parameter | Specification | | :--- | :--- | | **Color** | Red | | **Wavelength** | 621 nm (Dominant) | | **Luminous Intensity** | 1100 - 2130 mcd | | **Viewing Angle** | 70° (Horizontal) / 35° (Vertical) | | **Forward Current ($I_F$)** | 50 mA (Maximum) | | **Forward Voltage ($V_F$)** | 2.1 V (Typical) / 2.6 V (Maximum) | | **Lens Type** | Tinted / Diffused | | **Package Style** | 4mm Oval Through-Hole | --- ### 2. Key Electronic Features * **Oval Spatial Pattern:** Unlike standard round LEDs, the oval shape provides a wide horizontal viewing angle and a narrow vertical viewing angle. This is ideal for outdoor displays where the audience is spread out left-to-right but viewing from a consistent height. * **High Luminous Intensity:** It is engineered for sunlight readability, making it suitable for Variable Message Signs (VMS) and passenger information systems. * **Material Construction:** Built using **AlInGaP** (Aluminium Indium Gallium Phosphide) technology, which provides high efficiency and stability for the red spectrum. * **UV Resistance:** The epoxy resin contains UV inhibitors to prevent the lens from yellowing or becoming brittle when exposed to direct sunlight for long periods. --- ### 3. Part Number Breakdown The suffix `CS14QBB1` provides specific binning information: * **C4SMG:** Series designation (4mm Oval LED). * **RJS:** Color code (Red). * **CS14:** Bin range for Luminous Intensity. * **QBB1:** Specific color binning and packaging (typically bulk or ammo pack). --- ### 4. Application Circuit (Example) To drive this LED using a 5V logic source, a current-limiting resistor is required. ```cpp // Basic Calculation: // R = (V_source - V_forward) / I_desired // R = (5V - 2.1V) / 0.02A (20mA) // R = 145 Ohms (Use 150 Ohm standard resistor) ```