## Overview of the CLM4B-RKC The **CLM4B-RKC** is a high-performance, surface-mount (SMD) Light Emitting Diode (LED) manufactured by **Cree LED**. It belongs to the PLCC4 family and is specifically designed to emit **Red** light. This component is widely used in automotive signage, full-color displays, and channel letters due to its reliability and wide viewing angle. --- ### Technical Specifications The following table outlines the primary electrical and optical characteristics of the CLM4B-RKC: | Parameter | Specification | | :--- | :--- | | **Color** | Red | | **Dominant Wavelength** | 618nm - 630nm | | **Luminous Intensity** | 450 mcd - 1120 mcd | | **Forward Current ($I_F$)** | 50 mA | | **Forward Voltage ($V_F$)** | 2.0V (Typical) / 2.6V (Max) | | **Viewing Angle** | 120 degrees | | **Package Type** | PLCC4 (3.2 x 2.8 mm) | | **Operating Temperature** | -40°C to +100°C | --- ### Key Electronic Features 1. **High Reliability:** The package is designed to operate under a wide range of environmental conditions, making it suitable for outdoor applications. 2. **PLCC4 Industry Standard:** The 4-pin PLCC (Plastic Leaded Chip Carrier) package provides better heat dissipation compared to standard 2-pin SMD LEDs. 3. **Lead-Free (RoHS):** It is compliant with environmental regulations and is compatible with automatic placement equipment and infrared (IR) reflow soldering processes. 4. **Wide Viewing Angle:** The 120-degree radiation pattern ensures uniform light distribution, which is critical for large-scale video screens and signage. --- ### Pin Configuration and Geometry The CLM4B-RKC features a standard PLCC4 footprint. While it is a single-color LED, the 4-pin configuration allows for stable mechanical mounting and efficient thermal management. * **Anode:** Usually marked by a notch or a specific pin designation in the datasheet. * **Cathode:** Connected to the remaining pins to complete the circuit. --- ### Common Applications * **Traffic Signals:** Due to its specific red wavelength and high intensity. * **Automotive Lighting:** Dashboard backlighting and exterior turn signals. * **Electronic Signs:** Full-color "ticker" signs and large outdoor displays. * **Amusement Lighting:** Decorative lighting for rides and gaming machines.