The **CLM4B-RKC-AKC** is a high-performance Surface Mount Device (SMD) Light Emitting Diode (LED) manufactured by **Cree LED** (now part of SGH). It belongs to the **CLM4B** series, which is specifically designed for high-reliability applications such as signage and illumination. --- ### 1. Technical Specifications The following table summarizes the core electronic and optical characteristics of the CLM4B-RKC-AKC: | Parameter | Specification | | :--- | :--- | | **Color** | Red | | **Dominant Wavelength** | 619 nm - 624 nm | | **Luminous Intensity** | 710 mcd - 1400 mcd | | **Forward Current ($I_F$)** | 50 mA (Max) | | **Forward Voltage ($V_F$)** | 2.0 V (Typical) / 2.6 V (Max) | | **Viewing Angle** | 120 Degrees | | **Package Type** | PLCC4 (Surface Mount) | | **Operating Temperature** | -40°C to +100°C | --- ### 2. Key Features * **High Reliability:** Built using an industry-standard PLCC4 package to ensure durability in harsh environments. * **Wide Viewing Angle:** The 120-degree emission pattern makes it ideal for wide-area illumination and message signs. * **Stability:** Designed to work under a wide range of environmental conditions, maintaining color consistency over time. * **EIA-STD Compliance:** The package is compatible with automatic placement equipment and IR reflow soldering processes. --- ### 3. Application Use Cases This specific LED is commonly found in the following electronic systems: 1. **Full-Color Video Screens:** Used as the red component in outdoor and indoor large-scale displays. 2. **Traffic Signals:** Due to its high intensity and specific red wavelength. 3. **Automotive Lighting:** Used in instrument panels and interior decorative lighting. 4. **Amusement/Signage:** Channel letters and decorative architectural lighting. --- ### 4. Circuit Integration Example To drive this LED safely, a current-limiting resistor is required. Below is a simple calculation for a 5V DC supply: ```python # Ohms Law: R = (V_supply - V_forward) / I_target # Data from CLM4B-RKC-AKC datasheet: v_supply = 5.0 v_forward = 2.0 i_target = 0.020 # 20mA recommended for longevity resistor_value = (v_supply - v_forward) / i_target print(f"Required Resistor: {resistor_value} Ohms") # Result: 150 Ohms ```