### Overview of QBLP612-R The **QBLP612-R** is a high-brightness surface-mount (SMD) Light Emitting Diode (LED) manufactured by **QT-Brightek**. It belongs to the 0805 package size category, which is widely used in compact electronic designs. --- ### Technical Specifications Below are the primary electronic characteristics of the QBLP612-R: | Parameter | Value | | :--- | :--- | | **Color** | Red | | **Package Size** | 0805 (2.0mm x 1.25mm x 1.1mm) | | **Wavelength (λd)** | 620 nm - 630 nm | | **Forward Current ($I_f$)** | 20 mA (Nominal) | | **Forward Voltage ($V_f$)** | 1.8V (Typ) / 2.4V (Max) | | **Luminous Intensity ($I_v$)** | 80 mcd - 160 mcd | | **Viewing Angle** | 140 Degrees | | **Lens Type** | Water Clear | --- ### Key Features * **Compact Footprint:** The 0805 industry-standard size allows for high-density placement on Printed Circuit Boards (PCBs). * **AlGaInP Technology:** Utilizes Aluminum Gallium Indium Phosphide material, which ensures high efficiency and stable light output. * **Wide Viewing Angle:** A 140° angle provides excellent visibility from off-axis positions, making it ideal for status indicators. * **Compatibility:** Designed for automated "pick and place" assembly and compatible with infrared (IR) reflow soldering processes. --- ### Application Usage The QBLP612-R is commonly integrated into the following systems: 1. **Status Indicators:** Power ON/OFF lights for consumer electronics. 2. **Backlighting:** Backlighting for LCDs, switches, and small symbols. 3. **Network Hardware:** Data activity lights on routers or switches. 4. **Automotive Dashboards:** Indicator lamps for interior controls. --- ### Circuit Example (Typical Connection) To drive this LED using a 5V logic source, a current-limiting resistor is required. **Calculation:** $R = \frac{V_{source} - V_f}{I_f}$ $R = \frac{5V - 2.0V}{0.02A} = 150 \Omega$ ```text [5V Source] ---- [150 Ohm Resistor] ---- [Anode] LED [Cathode] ---- [GND] ```