The **QBLP615-R** is a specific surface-mount (SMD) Light Emitting Diode (LED) manufactured by **QT-Brightek**. It belongs to the 0805 package family and is designed for high-efficiency red light emission. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and optical characteristics of the QBLP615-R: | Parameter | Specification | | :--- | :--- | | **LED Color** | Red | | **Wavelength (Typical)** | 620 nm - 630 nm | | **Luminous Intensity** | 80 - 160 mcd (typical) | | **Forward Voltage ($V_f$)** | 1.8V - 2.4V | | **Forward Current ($I_f$)** | 20mA (Standard) | | **Viewing Angle** | 140° | | **Package Size** | 0805 (2.0mm x 1.25mm) | | **Lens Type** | Water Clear | --- ### 2. Physical Dimensions and Package The QBLP615-R uses the **0805 (Metric 2012)** form factor. This is a very common size in consumer electronics because it is small enough for high-density boards but large enough to be soldered by hand if necessary. * **Height:** 0.8 mm * **Mounting Type:** Surface Mount (SMD/SMT) * **Material:** AlGaInP (Aluminium Gallium Indium Phosphide) technology for high brightness. --- ### 3. Circuit Integration When designing a circuit for this LED, a current-limiting resistor is required to prevent burnout. **Example Calculation:** If using a 5V power supply: 1. **Formula:** $R = (V_{source} - V_f) / I_f$ 2. **Calculation:** $R = (5V - 2.0V) / 0.02A$ 3. **Result:** $150 \, \Omega$ ```python # Simple Python snippet to calculate LED resistor def calculate_resistor(v_source, v_forward, i_forward): return (v_source - v_forward) / i_forward r_val = calculate_resistor(5.0, 2.0, 0.02) print(f"Required Resistor: {r_val} Ohms") ``` --- ### 4. Typical Applications * **Status Indicators:** Power ON/OFF lights on PCBs. * **Backlighting:** Used for buttons, switches, and LCD displays. * **Consumer Electronics:** Wearables, routers, and mobile devices. * **Automotive:** Internal dashboard lighting and console indicators.