The part number **2YB3-R** typically refers to a **Surface Mount Device (SMD) LED**, specifically a bi-color or specialized LED component often used in consumer electronics, indicators, and status displays. Below is a detailed breakdown of the technical aspects associated with this part. --- ### 1. General Specifications While specifications can vary slightly by manufacturer (such as Everlight or Lite-On), the "2YB3-R" series generally follows these parameters: | Parameter | Typical Value | Unit | | :--- | :--- | :--- | | **Type** | Surface Mount (SMD) | - | | **Color 1** | Yellow (Y) | - | | **Color 2** | Blue (B) | - | | **Package Size** | 1210 (3225 Metric) or 0603 | mm | | **Forward Voltage (Vf)** | 2.0 (Yellow) / 3.3 (Blue) | Volts | | **Luminous Intensity** | 30 - 150 (depends on color) | mcd | | **Viewing Angle** | 120 - 140 | Degrees | --- ### 2. Pin Configuration and Internal Logic This component is often a **dual-chip** LED. Because it is labeled "YB" (Yellow-Blue), it is frequently used for status indication where a distinct contrast is needed. * **Common Anode/Cathode:** Most 2YB3-R models are configured with a common terminal to save space on the PCB. * **Independent Control:** You can trigger the Yellow and Blue chips independently or simultaneously to create a blended color (though Yellow + Blue creates a pale whitish-green or "ice" hue rather than a clean third color). --- ### 3. Key Electronic Characteristics #### A. Power Dissipation The device is designed for low-power operation. Overdriving the LED beyond the rated current (usually **20mA**) will lead to rapid degradation or immediate failure of the semiconductor junction. #### B. Thermal Management Since these are SMD parts, the heat is dissipated through the **solder pads** into the PCB copper planes. High-density layouts should ensure adequate thermal relief. #### C. Reverse Voltage Like most LEDs, the 2YB3-R has a low tolerance for reverse voltage (typically **5V**). A protection diode or correct orientation is critical during circuit design. --- ### 4. Typical Applications * **Network Equipment:** Link/Activity status lights (e.g., Yellow for 10/100 Mbps, Blue for Gigabit). * **Consumer Electronics:** Power/Standby indicators for premium devices. * **Backlighting:** Small scale illumination for membrane switches or icons. --- ### 5. Implementation Example (Arduino/Microcontroller) To drive this part safely, current-limiting resistors must be calculated for each color individually due to the difference in Forward Voltage ($V_f$). ```cpp // Example: Calculating Resistor for 5V Supply // Yellow: (5V - 2.0V) / 0.020A = 150 Ohms // Blue: (5V - 3.3V) / 0.020A = 85 Ohms (use 100 Ohm standard) void setup() { pinMode(PIN_YELLOW, OUTPUT); pinMode(PIN_BLUE, OUTPUT); } void loop() { digitalWrite(PIN_YELLOW, HIGH); // Yellow ON delay(1000); digitalWrite(PIN_YELLOW, LOW); digitalWrite(PIN_BLUE, HIGH); // Blue ON delay(1000); } ```