## KRTBS-4B1-R: Electronic Specifications and Technical Overview The **KRTBS-4B1-R** is a high-performance, surface-mount (SMD) **RGB Multi-chip LED** manufactured by **OSRAM Opto Semiconductors** (now ams OSRAM). It is part of the Multi CHIPLED family, specifically designed for full-color video walls, indoor displays, and decorative lighting applications. --- ### 1. Key Technical Specifications The device integrates three individual chips (Red, True Green, and Blue) within a single compact package. | Parameter | Red (623 nm) | True Green (530 nm) | Blue (471 nm) | | :--- | :--- | :--- | :--- | | **Material** | AlGaInP | InGaN | InGaN | | **Luminous Intensity (typ.)** | 355 mcd | 710 mcd | 160 mcd | | **Forward Voltage (typ.)** | 2.05 V | 2.85 V | 2.85 V | | **Max Forward Current** | 25 mA | 25 mA | 25 mA | | **Viewing Angle** | 120° | 120° | 120° | --- ### 2. Component Design & Architecture #### Package Details - **Type:** SMT package with a black surface. - **Surface:** The black body enhances contrast, making it ideal for high-definition video screens where deep black levels are required. - **Dimensions:** Approximately 1.6 mm x 1.6 mm x 0.9 mm. - **Lead Finish:** Au (Gold) plating, which ensures excellent solderability and corrosion resistance. #### Internal Wiring The KRTBS-4B1-R typically uses a **Common Anode** or a specific 4-pin configuration that allows for independent control of each color channel via Pulse Width Modulation (PWM). --- ### 3. Critical Features 1. **High Contrast:** The diffused black epoxy resin minimizes reflections from ambient light. 2. **Color Uniformity:** Advanced binning processes ensure consistent color across large-scale display modules. 3. **Robustness:** High ESD (Electrostatic Discharge) withstand voltage (up to 2kV per JESD22-A114-F). 4. **Thermal Management:** Designed for low thermal resistance to ensure longevity during continuous operation. --- ### 4. Implementation Circuitry To drive this component, a constant current LED driver is recommended. Below is a conceptual representation of the electrical connection: ```cpp // Logic for driving the KRTBS-4B1-R via PWM void setColor(int redVal, int greenVal, int blueVal) { analogWrite(RED_PIN, redVal); // Adjust Red brightness analogWrite(GREEN_PIN, greenVal); // Adjust Green brightness analogWrite(BLUE_PIN, blueVal); // Adjust Blue brightness } ``` --- ### 5. Common Applications * **Indoor LED Walls:** High-resolution video displays for advertising or stadiums. * **Consumer Electronics:** Indicator lights requiring a wide gamut of colors. * **Backlighting:** Specialized illumination for control panels and switches.