The **KRTBS-2C2-R/Q** is a high-performance, ultra-compact **Surface Mount Device (SMD) RGB LED** manufactured by **KOA Speer** (or similar specialized optoelectronic suppliers). It is specifically designed for high-density display applications and indicator panels where space is limited but color precision is required. --- ### 1. Technical Specifications The KRTBS-2C2-R/Q contains three independent chips (Red, Green, and Blue) within a single package, allowing for full-spectrum color mixing. | Parameter | Red (R) | Green (G) | Blue (B) | | :--- | :--- | :--- | :--- | | **Dominant Wavelength** | ~622 nm | ~530 nm | ~470 nm | | **Luminous Intensity** | 71 - 180 mcd | 140 - 355 mcd | 28 - 71 mcd | | **Forward Voltage (Typ)** | 2.0 V | 3.2 V | 3.2 V | | **Max Forward Current** | 20 mA | 20 mA | 20 mA | | **Viewing Angle** | 120° | 120° | 120° | --- ### 2. Key Features * **Common Anode Configuration:** Typically, these LEDs share a common positive terminal, allowing for independent control of the cathodes to mix colors. * **Compact Footprint:** Usually comes in a 1010 or 1616 metric package size, making it ideal for "mini-LED" displays. * **Black Surface Coating:** The "B" in the series often denotes a black package body, which significantly enhances the **contrast ratio** for video screens by reducing ambient light reflection. * **Diffused Lens:** Ensures smooth color blending at short viewing distances. --- ### 3. Pin Configuration & Wiring In a standard 4-pin RGB SMD setup like the KRTBS series: | Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | Cathode (Blue) | Connect to PWM/Ground through resistor | | 2 | Cathode (Red) | Connect to PWM/Ground through resistor | | 3 | Common Anode | Connect to Positive Supply (VCC) | | 4 | Cathode (Green) | Connect to PWM/Ground through resistor | --- ### 4. Typical Applications * **Indoor Video Walls:** High-resolution LED screens (Pixel Pitch < 2mm). * **Consumer Electronics:** Multi-color status indicators for wearables or smart home devices. * **Automotive Interior:** Ambient lighting and dashboard symbols. * **Backlighting:** Uniform RGB illumination for buttons and LCD overlays. --- ### 5. Design Considerations ```cpp // Example: Pseudo-code for Arduino PWM Color Mixing void setColor(int red, int green, int blue) { analogWrite(RED_PIN, 255 - red); // Common Anode: Low value = Brighter analogWrite(GREEN_PIN, 255 - green); analogWrite(BLUE_PIN, 255 - blue); } ``` * **Heat Dissipation:** Due to the small size, ensure the PCB has adequate thermal vias if driving many units at full brightness. * **Current Limiting:** Always use series resistors calculated for each specific color's forward voltage to prevent burnout.