## C4SMB-RGF Electronic Components Overview The **C4SMB-RGF** is a high-performance, **Red/Amber (Red-Orange)** Round LED manufactured by **Cree LED** (formerly Cree Inc.). It is specifically designed for outdoor signage and electronic displays due to its high luminous intensity and durability. --- ### 1. Key Technical Specifications The following table outlines the fundamental electrical and optical characteristics of the C4SMB-RGF: | Parameter | Specification | | :--- | :--- | | **Color** | Red-Orange | | **Wavelength** | 619 nm - 624 nm | | **Luminous Intensity** | 390 mcd - 1100 mcd | | **Forward Current ($I_F$)** | 50 mA (Maximum) | | **Forward Voltage ($V_F$)** | 2.1 V (Typical) / 2.6 V (Max) | | **Viewing Angle** | 90° (Horizontal) / 45° (Vertical) | | **Lens Shape** | Oval 4mm | | **Mounting Type** | Through-Hole | --- ### 2. Physical and Structural Parts The component is composed of several critical internal and external parts: 1. **LED Chip (Die):** Uses **AlGaInP** (Aluminum Gallium Indium Phosphide) material technology, which is highly efficient for producing red and orange light spectrums. 2. **Epoxy Resin Lens:** The "RGF" designation refers to the specific tinted/diffused lens. The oval shape is designed to provide a wide horizontal viewing angle, making it ideal for roadside signs. 3. **Lead Frame:** Two metal pins (Anode and Cathode) used for through-hole soldering on a PCB. 4. **Standoffs:** Often features integrated "bosses" or standoffs on the leads to ensure consistent height and airflow during the soldering process. --- ### 3. Key Applications Because of its radiation pattern and high brightness, this part is used in: * **Variable Message Signs (VMS):** Highway traffic alerts. * **Outdoor Advertising:** Full-color video screens. * **Amusement Lighting:** High-visibility decorative lighting. --- ### 4. Circuit Implementation Example To use this LED with a 5V supply, a current-limiting resistor is required. ```cpp // Example Calculation: // R = (V_source - V_forward) / I_desired // R = (5V - 2.1V) / 0.020A (20mA) // R = 145 Ohms (Use 150 Ohm standard resistor) ```