The **KRTB-111-R** is a specific electronic component manufactured by **Kingbright**. It belongs to the category of **Surface Mount Device (SMD) Light Emitting Diodes (LEDs)**. Specifically, it is a high-performance **RGB (Red, Green, Blue) LED** designed for multi-color display and backlighting applications. --- ### 1. Key Technical Specifications The KRTB-111-R is a "3-in-1" LED, meaning it contains three separate chips within a single package that can be controlled independently to produce any color in the visible spectrum. | Parameter | Red (AlGaInP) | Green (InGaN) | Blue (InGaN) | | :--- | :--- | :--- | :--- | | **Peak Wavelength** | 630 nm | 520 nm | 465 nm | | **Luminous Intensity** | 100 - 200 mcd | 300 - 600 mcd | 80 - 150 mcd | | **Forward Voltage (Typ)** | 2.0 V | 3.3 V | 3.3 V | | **Forward Current (Max)** | 30 mA | 30 mA | 30 mA | | **Viewing Angle** | 120° | 120° | 120° | --- ### 2. Physical and Design Features * **Package Type:** PLCC-4 (Plastic Leaded Chip Carrier) or similar SMD footprint. * **Dimensions:** Typically around **3.5mm x 2.8mm** (common for the 3528 series). * **Lens Style:** Water Clear. This ensures maximum light output and crisp color mixing. * **Common Cathode/Anode:** Most variants of this series utilize a **common cathode** configuration, though pinouts should be verified via the specific datasheet revision. --- ### 3. Application Use Cases Due to its compact size and RGB capabilities, the KRTB-111-R is widely used in: 1. **Status Indicators:** Multi-color notifications for consumer electronics. 2. **Backlighting:** Illuminating LCD screens, push buttons, or control panels. 3. **Decorative Lighting:** LED strips and architectural accent lighting. 4. **Gaming Peripherals:** RGB keyboards and mouse lighting. --- ### 4. Implementation Example (Arduino/Microcontroller) To drive this LED, you generally need three current-limiting resistors to protect each internal diode. ```cpp // Example: Cycling colors on KRTB-111-R int redPin = 9; // PWM Pin for Red int greenPin = 10; // PWM Pin for Green int bluePin = 11; // PWM Pin for Blue void setup() { pinMode(redPin, OUTPUT); pinMode(greenPin, OUTPUT); pinMode(bluePin, OUTPUT); } void loop() { // Set to Purple (Red + Blue) analogWrite(redPin, 255); analogWrite(greenPin, 0); analogWrite(bluePin, 255); delay(1000); } ``` ---