The **C5SMB-RJS** is a high-brightness, through-hole Light Emitting Diode (LED) manufactured by **Cree LED** (formerly Wolfspeed/Cree). It belongs to the Screen Master® series, specifically designed for outdoor video screens and decorative lighting applications. --- ### ## Technical Specifications The following table summarizes the key electrical and optical characteristics of the C5SMB-RJS: | Parameter | Specification | | :--- | :--- | | **Color** | Red | | **Wavelength (Typical)** | 628 nm | | **Luminous Intensity** | 390 - 1100 mcd | | **Viewing Angle** | 90° (Horizontal) / 45° (Vertical) | | **Forward Current ($I_F$)** | 50 mA (Maximum) | | **Forward Voltage ($V_F$)** | 2.1 V (Typical) / 2.6 V (Max) | | **Lens Type** | Red Diffused / Oval Shape | | **Mounting Type** | Through-Hole (Radial) | --- ### ## Key Features 1. **Oval Shape:** The LED features an oval lens (5mm), which creates a wide horizontal viewing angle and a narrower vertical angle. This is ideal for signage where viewers are mostly level with or below the screen. 2. **High Optical Grade Epoxy:** The package is constructed with an optical-grade epoxy that provides excellent resistance to high temperatures and humidity. 3. **UV Resistance:** It contains UV inhibitors to prevent the lens from yellowing or degrading when exposed to direct sunlight over long periods. 4. **Tinted/Diffused Lens:** The red tinted lens ensures high contrast and visibility even in high-ambient light environments. --- ### ## Common Applications * **Electronic Signs and Signals:** Used in variable-message signs (VMS) on highways. * **Outdoor Video Displays:** Large-scale LED billboards. * **Commercial Advertising:** Neon-replacement and channel letter lighting. * **Amusement Lighting:** Decorative lighting for fairs or parks. --- ### ## Circuit Integration Example To drive this LED using a standard 5V DC source, you must use a current-limiting resistor to prevent damage. ```cpp // Basic Calculation for Current Limiting Resistor // Source Voltage (Vs) = 5V // Forward Voltage (Vf) = 2.1V // Target Current (I) = 20mA (0.02A) for longevity R = (Vs - Vf) / I R = (5V - 2.1V) / 0.02A R = 145 Ohms (Use 150 Ohm standard resistor) ```