The **QBLP674-R** is a surface-mount (SMD) Light Emitting Diode (LED) manufactured by **QT-Brightek**. It belongs to the PLCC-2 series and is specifically designed for high-reliability applications requiring a red light output. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and optical characteristics of the QBLP674-R: | Parameter | Specification | | :--- | :--- | | **LED Color** | Red | | **Wavelength (Typical)** | 624 nm (Dominant) / 632 nm (Peak) | | **Luminous Intensity** | 160 mcd (typical) @ 20mA | | **Forward Voltage ($V_F$)** | 2.0V (Typical) / 2.5V (Maximum) | | **Forward Current ($I_F$)** | 20 mA (Test Current) / 30 mA (Maximum) | | **Viewing Angle** | 120 Degrees | | **Package Type** | PLCC-2 (3528 Metric) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Physical Dimensions & Packaging The QBLP674-R utilizes the industry-standard **PLCC-2** package, which is favored for its robustness and ease of assembly. * **Size:** 3.5mm x 2.8mm x 1.9mm. * **Encapsulation:** Water Clear lens for maximum light transmission. * **Mounting:** Surface Mount Device (SMD/SMT). * **Polarity:** Indicated by a notch on the corner of the package (Cathode side). --- ### 3. Circuit Integration When designing a circuit with the QBLP674-R, it is essential to include a current-limiting resistor to prevent thermal runaway or damage. #### Example Calculation: To run the LED on a 5V DC supply at the standard 20mA current: ```text R = (V_source - V_forward) / I_forward R = (5V - 2.0V) / 0.02A R = 150 Ohms ``` --- ### 4. Typical Applications Due to its wide viewing angle and standard footprint, it is commonly used in: * **Dashboard Lighting:** Automotive interior indicators. * **Industrial Equipment:** Status indicators and alarm lights. * **Consumer Electronics:** Backlighting for buttons and switches. * **Telecommunications:** Network activity indicators.