The **C4SMJ-RJS-CS14QBB1** is a high-brightness, through-hole LED manufactured by **Cree LED** (now a part of SGH). It is specifically designed for outdoor signage and video displays due to its durability and color consistency. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and optical characteristics: | Parameter | Specification | | :--- | :--- | | **LED Color** | Red | | **Wavelength** | 621 nm (Typical) | | **Luminous Intensity** | 770 mcd – 2130 mcd | | **Viewing Angle** | 70° (Horizontal) / 35° (Vertical) | | **Forward Current ($I_f$)** | 50 mA (Maximum) | | **Forward Voltage ($V_f$)** | 2.1 V (Typical) | | **Lens Shape** | Oval (4mm) | | **Mounting Type** | Through-Hole | --- ### 2. Physical and Material Composition The "C4SMJ" series utilizes specific materials to ensure performance in harsh environments: * **Technology:** Built using **AlInGaP** (Aluminium Indium Gallium Phosphide) material technology, which provides high efficiency for red spectrum light. * **Package Type:** 4mm Oval package. The oval shape is intentional; it creates a wide horizontal viewing angle and a narrow vertical viewing angle, which is ideal for outdoor screens viewed from the ground. * **Lens Tint:** Red diffused or tinted to enhance contrast and ensure the LED color is visible even when the unit is turned off. --- ### 3. Application and Usage This specific part number is common in the following electronic systems: 1. **Variable Message Signs (VMS):** Highway signs that display traffic information. 2. **Full-Color Outdoor Video Screens:** Large-scale advertising billboards where the oval shape prevents light from wasting toward the sky or ground. 3. **Digital Signage:** Used as the "Red" component in RGB pixel clusters. 4. **Gas Station Price Signs:** Chosen for its long-term reliability and resistance to UV exposure. --- ### 4. Part Number Breakdown (Nomenclature) * **C4SMJ:** Series prefix (Screen Master 4-mm Oval LED). * **RJS:** Color code (Red). * **CS14QBB1:** Specific binning code referring to the intensity range, dominant wavelength, and packaging method (often Bulk or Ammo pack). ---