## CP42B-RKS: Electronic Component Overview The **CP42B-RKS** is a high-brightness, high-performance **Red LED** manufactured by **Cree LED** (specifically under the P4 series). These LEDs are often referred to as "Piranha" or "Super Flux" LEDs due to their unique 4-pin square package design. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Color** | Red | | **Dominant Wavelength** | 620nm – 630nm | | **Luminous Intensity** | 1100 – 4400 mcd (typical) | | **Viewing Angle** | 120 Degrees | | **Forward Current ($I_F$)** | 30 mA | | **Forward Voltage ($V_F$)** | 2.1V (Typical) / 2.6V (Max) | | **Package Type** | 7.6mm Square (4-pin) | | **Lens Appearance** | Water Clear | --- ### 2. Physical Construction & Pinout The CP42B-RKS utilizes a unique physical structure compared to standard 5mm LEDs: * **Four-Pin Design:** Unlike standard 2-pin LEDs, the P4 package has four leads. This provides superior mechanical stability and better thermal dissipation. * **Encapsulation:** It is housed in an epoxy resin package that is resistant to UV and high temperatures. * **Dimensions:** It features a standard $7.6mm \times 7.6mm$ base, making it compatible with automated insertion equipment. --- ### 3. Core Features & Benefits * **High Luminous Output:** Designed for high visibility even in direct sunlight. * **Wide Viewing Angle:** The 120-degree radiation pattern ensures uniform light distribution, which is essential for signage. * **Thermal Management:** The 4-pin design allows heat to transfer more efficiently from the LED die to the PCB, extending the component's lifespan. * **Durability:** Highly resistant to vibration and shock, making it suitable for automotive and industrial environments. --- ### 4. Common Applications Because of its brightness and reliability, the CP42B-RKS is frequently used in: 1. **Automotive Lighting:** Stop lights, turn signals, and CHMSL (Center High-Mounted Stop Lamps). 2. **Electronic Signage:** Variable message signs (VMS) and advertising displays. 3. **Channel Lettering:** Backlighting for commercial signage. 4. **Entertainment:** Decorative lighting and architectural accents. --- ### 5. Implementation Example To drive this LED using a 5V DC source, you would calculate the current-limiting resistor as follows: ```python # Ohms Law: R = (V_source - V_forward) / I_forward v_source = 5.0 # Volts v_forward = 2.1 # Volts (Typical) i_forward = 0.03 # Amperes (30mA) resistor_value = (v_source - v_forward) / i_forward print(f"Required Resistor: {resistor_value} Ohms") # Result: ~96.6 Ohms ``` ---