The **KRTB-212-R** is a specific electronic component manufactured by **Kingbright**. It is a surface-mount (SMD) **Full-Color (RGB) LED** designed for high-performance visual applications. --- ## 1. Technical Specifications The KRTB-212-R integrates three separate LED chips (Red, Green, and Blue) into a single compact package. Below are the key technical parameters: | Parameter | Red (R) | Green (G) | Blue (B) | | :--- | :--- | :--- | :--- | | **Material** | AlGaInP | InGaN | InGaN | | **Wavelength (Typ.)** | 621 nm | 525 nm | 465 nm | | **Forward Voltage (Typ.)** | 2.0 V | 3.3 V | 3.3 V | | **Luminous Intensity (Typ.)** | 120 mcd | 280 mcd | 60 mcd | | **Viewing Angle** | 120° | 120° | 120° | --- ## 2. Key Features The KRTB-212-R is known for its reliability and efficiency in small-scale electronics. * **Package Size:** Extremely small footprint (approx. 2.1mm x 2.1mm), making it ideal for high-density boards. * **Common Anode/Cathode:** Typically configured with a **Common Anode**, allowing independent control of each color via the cathode pins. * **Reflow Profile:** Compatible with infrared (IR) reflow soldering processes. * **Moisture Sensitivity:** Generally rated at MSL 3 (Moisture Sensitivity Level). * **Color Mixing:** Excellent color uniformity due to the close proximity of the three dies within the package. --- ## 3. Pin Configuration & Application The device usually features 4 leads (terminals): 1. **Pin 1:** Cathode (Red) 2. **Pin 2:** Common Anode 3. **Pin 3:** Cathode (Blue) 4. **Pin 4:** Cathode (Green) ### Usage Example (Pseudo-code for PWM Control) To achieve a specific color, such as Purple, you would modulate the duty cycle of the Red and Blue pins using Pulse Width Modulation (PWM): ```cpp // Example: Setting a Purple color on KRTB-212-R analogWrite(RED_PIN, 255); // Full Red analogWrite(GREEN_PIN, 0); // Green Off analogWrite(BLUE_PIN, 180); // Medium Blue ``` --- ## 4. Typical Applications * **Backlighting:** Used for buttons, switches, and LCD displays. * **Status Indicators:** Providing multi-color feedback (e.g., Red for error, Green for OK, Blue for Bluetooth pairing). * **Wearables:** Due to the small size and low power consumption. * **Consumer Electronics:** Smart home devices and gaming peripherals.