### QBLP595-R5: Electronic Component Overview The **QBLP595-R5** is a high-brightness Red Surface Mount Device (SMD) LED. It is commonly used in consumer electronics, status indicators, and industrial equipment due to its compact "0402" package size and efficiency. --- ### Technical Specifications The following table outlines the key electrical and optical characteristics of the component: | Parameter | Specification | Unit | | :--- | :--- | :--- | | **Package Size** | 0402 (1.0 x 0.5 x 0.4 mm) | mm | | **Emitted Color** | Red | - | | **Dominant Wavelength** | 620 - 630 | nm | | **Forward Current ($I_F$)** | 20 (Typical) / 30 (Max) | mA | | **Forward Voltage ($V_F$)** | 1.7 (Min) - 2.0 (Typ) - 2.5 (Max) | V | | **Luminous Intensity ($I_V$)** | 50 - 125 | mcd | | **Viewing Angle** | 120 | Degrees | | **Material** | AlGaInP | - | --- ### Key Features and Design Considerations 1. **Miniature Footprint:** Its 0402 size makes it ideal for high-density circuit boards where space is at a premium (e.g., smartphones, wearable devices). 2. **Material Composition:** It utilizes **AlGaInP** (Aluminum Gallium Indium Phosphide) technology, which provides high luminous efficiency for red and orange spectrums. 3. **Wide Viewing Angle:** With a 120-degree viewing angle, it is suitable for backlighting and wide-area indicators. 4. **Polarity:** Like most SMD LEDs, the cathode side is usually marked with a green line or a notch on the underside of the package to ensure correct orientation during assembly. --- ### Recommended Circuit Application To ensure the longevity of the LED, a current-limiting resistor must be used. Below is a simple calculation example for a 5V circuit: `R = (V_source - V_F) / I_F` ```python # Calculation Example v_source = 5.0 # Volts v_forward = 2.0 # Typical Forward Voltage i_forward = 0.02 # 20mA in Amps resistance = (v_source - v_forward) / i_forward print(f"Required Resistor: {resistance} Ohms") # Result: 150 Ohms ``` ---