## QBLP653R-R Component Overview The **QBLP653R-R** is a specific surface-mount (SMD) Light Emitting Diode (LED) manufactured by **QT-Brightek**. It belongs to the 1206 package size category and is widely used for status indication in various electronic devices. --- ### Technical Specifications The following table outlines the primary electrical and optical characteristics of the QBLP653R-R: | Parameter | Specification | | :--- | :--- | | **LED Color** | Red | | **Package Size** | 1206 (3.2 x 1.6 x 1.1 mm) | | **Peak Wavelength** | 630 nm | | **Luminous Intensity** | 80 - 160 mcd @ 20mA | | **Forward Voltage ($V_f$)** | 2.0V (Typical) | | **Forward Current ($I_f$)** | 20 mA | | **Viewing Angle** | 140 Degrees | | **Lens Type** | Water Clear | --- ### Key Internal Components 1. **LED Die (AlGaInP):** The light-emitting material is typically Aluminum Gallium Indium Phosphide, which is efficient for producing the red spectrum. 2. **Substrate:** A ceramic or epoxy-based PCB carrier that holds the die and provides the electrical contact pads. 3. **Encapsulant:** A clear epoxy or silicone resin that protects the die from oxidation and physical damage while allowing light to pass through. 4. **Terminations:** Gold or Tin-plated contact pads on the bottom of the package for SMT (Surface Mount Technology) soldering. --- ### Circuit Integration Considerations When designing a circuit for the QBLP653R-R, it is essential to use a current-limiting resistor to prevent thermal runaway. #### Example Calculation: If using a **5V** power supply: * **Target Current:** 20mA (0.02A) * **Forward Voltage ($V_f$):** 2.0V * **Formula:** $R = (V_{source} - V_f) / I$ * **Result:** $(5V - 2.0V) / 0.02A = 150 \Omega$ #### Pin Configuration (Polarity): The QBLP653R-R has a clear polarity indicator (usually a green mark or a notch on the cathode side). * **Anode (+):** Connected to the positive rail via resistor. * **Cathode (-):** Connected to the ground/negative rail. ---