## KRTB-1C2-R: Electronic Component Analysis The **KRTB-1C2-R** is a high-performance **Tri-Color (RGB) LED** manufactured by **ROHM Semiconductor**. It is specifically designed for surface-mount (SMD) applications where high brightness and a compact footprint are required. --- ### 1. General Specifications The device integrates three separate LED chips (Red, Green, and Blue) into a single package, allowing for full-color spectrum mixing. | Property | Specification | | :--- | :--- | | **Package Size** | 1.0 x 1.0 mm (PICOLED™-RGB) | | **Colors** | Red, Green, Blue (RGB) | | **Luminous Intensity** | R: 28mcd, G: 71mcd, B: 18mcd (typical) | | **Forward Voltage ($V_F$)** | R: 1.9V, G: 2.9V, B: 2.9V | | **Operating Temperature** | -40°C to +85°C | | **Lens Type** | Clear / Transparent | --- ### 2. Pin Configuration and Internal Circuit The KRTB-1C2-R typically uses a 4-terminal configuration. One common terminal (usually the Anode) and three separate terminals for the Cathodes of each color chip. | Pin Number | Assignment | Function | | :--- | :--- | :--- | | 1 | Cathode (Blue) | Controls Blue light intensity | | 2 | Cathode (Green) | Controls Green light intensity | | 3 | Cathode (Red) | Controls Red light intensity | | 4 | Common Anode | Positive supply shared by all three dies | --- ### 3. Key Electronic Characteristics * **Wavelength Precision:** * **Red:** 624 nm * **Green:** 527 nm * **Blue:** 470 nm * **PICOLED™ Technology:** This is a proprietary ROHM technology that minimizes the package size while maintaining heat dissipation efficiency, making it ideal for high-density portable electronics. * **Color Mixing:** Since the three dies are placed in extremely close proximity, the color mixing is highly uniform even at short viewing distances. --- ### 4. Common Applications Due to its ultra-compact size, the KRTB-1C2-R is found in: 1. **Wearable Devices:** Smartwatches and fitness trackers for status indicators. 2. **Portable Electronics:** Indicator lights for smartphones and tablets. 3. **Matrix Displays:** Small-scale RGB screens or decorative lighting strips. 4. **Gaming Peripherals:** RGB backlighting for keyboards or mouse buttons. --- ### 5. Implementation Code (Example) If you are controlling this LED using a microcontroller (like an Arduino) via PWM (Pulse Width Modulation), the logic would look like this: ```cpp // Define Pins (Assuming Common Anode) const int redPin = 9; const int greenPin = 10; const int bluePin = 11; void setup() { pinMode(redPin, OUTPUT); pinMode(greenPin, OUTPUT); pinMode(bluePin, OUTPUT); } void loop() { // Set to a custom color (Purple: Red + Blue) // Low value = Brighter for Common Anode analogWrite(redPin, 0); analogWrite(greenPin, 255); analogWrite(bluePin, 0); } ```