The **C5SMF-RJS-CT0W0BB1** is a specific part number for a high-brightness, through-hole LED manufactured by **Cree LED** (formerly Wolfspeed/Cree). It belongs to the Screen Master® series, designed primarily for outdoor signage and video displays. --- ### 1. Key Technical Specifications The part number encodes specific characteristics regarding color, intensity, and physical packaging. | Parameter | Specification | | :--- | :--- | | **Color** | Red | | **Wavelength** | 621 nm (Typical) | | **Luminous Intensity** | 1100 - 3000 mcd | | **Lens Type** | Red Diffused / Tinted | | **Package Shape** | 5mm Round (Standard T-1 3/4) | | **Viewing Angle** | 70° (Horizontal) / 35° (Vertical) | | **Forward Current** | 50 mA (Maximum) | | **Forward Voltage** | 2.1 V (Typical) | --- ### 2. Breakdown of the Part Number Cree uses a complex nomenclature to define the binning and packaging of their LEDs: * **C5SMF**: Series code for 5mm Oval LEDs (Optimized for outdoor signs). * **RJS**: Red color code with specific viewing angles. * **CT0W0BB1**: This suffix represents the specific **Binning** (the sorted range of brightness and color): * **CT0W0**: Intensity range code (Minimum to Maximum brightness). * **BB1**: Packaging type (usually indicating bulk or specific tape-and-reel orientation). --- ### 3. Key Electronic Characteristics When designing a circuit for this component, consider the following electronic behaviors: #### A. Power Dissipation The LED is designed for efficiency. At a standard operating current of **20mA**, the power consumption is approximately **42mW**. However, it can handle up to 50mA if thermal management is sufficient. #### B. Radiation Pattern Unlike standard round LEDs that have a symmetrical 360° beam, the **C5SMF** series features an **Oval** spatial radiation pattern. * **Horizontal spread:** Wide (70°) to ensure visibility from the sides. * **Vertical spread:** Narrow (35°) to concentrate light toward the viewers and reduce light pollution into the sky. #### C. Environmental Durability These parts are built with optical-grade epoxy that includes **UV inhibitors**. This prevents the plastic from yellowing or becoming brittle when exposed to direct sunlight for long periods. --- ### 4. Implementation Example To drive this LED from a 5V DC source at the recommended 20mA current, you would use a current-limiting resistor. ```cpp // Formula: R = (V_source - V_forward) / I_forward // R = (5V - 2.1V) / 0.020A // R = 145 Ohms (Use a 150 Ohm standard resistor) ```