The **C4SMT-RJS-CT14QBB1** is a high-brightness LED manufactured by **Cree LED (Wolfspeed)**. It belongs to the **Screen Master®** series, specifically designed for outdoor video screens and signage applications. ### 1. General Specifications This component is a through-hole, oval LED engineered for optical precision and durability in outdoor environments. | Feature | Specification | | :--- | :--- | | **Color** | Red | | **Wavelength (Typical)** | 621 nm | | **Luminous Intensity** | 770 - 2130 mcd | | **Viewing Angle** | 70° (Horizontal) / 35° (Vertical) | | **Lens Shape** | Oval (4mm) | | **Mounting Type** | Through-Hole | | **Lens Appearance** | Red Diffused | --- ### 2. Electrical & Optical Characteristics The electrical profile is optimized for low power consumption while maintaining high luminosity. | Parameter | Symbol | Value (Typical) | | :--- | :--- | :--- | | **Forward Current** | $I_F$ | 50 mA | | **Forward Voltage** | $V_F$ | 2.1 V (Max 2.6V) | | **Reverse Voltage** | $V_R$ | 5 V | | **Power Dissipation** | $P_D$ | 130 mW | | **Operating Temperature** | $T_{opr}$ | -40°C to +100°C | --- ### 3. Key Features & Design * **Advanced Optical Grade Epoxy:** The package uses a specialized epoxy that provides superior resistance to UV radiation and moisture, preventing "yellowing" over time. * **Radiation Pattern:** The 70°/35° oval viewing angle is specifically designed for passenger information signs and large-scale outdoor displays, ensuring the light is directed where viewers are located rather than wasting light toward the sky. * **Standoff Options:** This specific part number includes "stoppers" or standoffs on the leads to ensure consistent mounting height and airflow on the PCB. --- ### 4. Part Number Breakdown (Decoder) The alphanumeric string defines the specific binning and physical traits: * **C4SMT:** 4-mm Oval LED with Standoffs. * **RJS:** Red color (AlInGaP material). * **CT14QBB1:** Specific code for intensity range, color binning, and packaging (Bulk/Tape). --- ### 5. Application Circuit Example To drive this LED using a 5V source, a current-limiting resistor is required. ```cpp // Example Calculation: // Source Voltage (Vs) = 5V // Forward Voltage (Vf) = 2.1V // Target Current (If) = 20mA (Standard operating) // Resistance (R) = (Vs - Vf) / If // R = (5 - 2.1) / 0.020 = 145 Ohms ```