The **BL-RUB139B** is a specific electronic component typically categorized as an **LED (Light Emitting Diode)** device, often used in indicator panels, displays, or as a backlight source. It is manufactured by Betlux Electronics. --- ### 1. Technical Specifications Below are the typical technical parameters associated with this component type: | Parameter | Description | Typical Value | | :--- | :--- | :--- | | **Component Type** | Rectangular LED Lamp | LED | | **Emitted Color** | Ultra Bright Red | 630nm - 660nm | | **Lens Appearance** | Water Clear / Color Diffused | Varies by sub-model | | **Forward Voltage ($V_f$)** | Typical Operating Voltage | 1.8V - 2.2V | | **Forward Current ($I_f$)** | Standard Operating Current | 20mA | | **Luminous Intensity** | Brightness level | 50 - 150 mcd | | **Viewing Angle** | Spread of light | 100° - 120° | --- ### 2. Key Features * **Form Factor:** It usually features a rectangular shape ($2 \times 5 \times 7$ mm is common for this series), making it ideal for stackable bar graphs or flush-mount panel indicators. * **Low Power Consumption:** Operates efficiently at low currents, making it compatible with CMOS/TTL drive circuits. * **Durability:** Solid-state reliability with a long operational life (often 100,000+ hours). * **IC Compatibility:** Can be easily driven by microcontrollers (like Arduino or ESP32) using a simple current-limiting resistor. --- ### 3. Pin Configuration and Circuitry The device follows a standard Diode polarity: 1. **Anode (+):** The longer lead. Connects to the positive voltage source through a resistor. 2. **Cathode (-):** The shorter lead, often marked by a flat edge on the LED body. Connects to the ground (GND). #### Basic Connection Formula To calculate the necessary resistor ($R$): ```text R = (Source Voltage - Forward Voltage) / Forward Current Example for 5V supply: R = (5V - 2.0V) / 0.02A = 150 Ohms ``` --- ### 4. Common Applications * **Status Indicators:** Power ON/OFF lights on consumer electronics. * **Bar Graph Displays:** Stacked together to show levels (volume, battery, signal). * **Backlighting:** Illuminating small LCD screens or membrane switches. * **Control Panels:** Industrial machinery interfaces.