The **QBLP595-R** is a specific surface-mount technology (SMT) Light Emitting Diode (LED) manufactured by **QT-Brightek**. It belongs to the 0402 package size category, which is one of the smallest industry-standard footprints for electronic components. --- ### 1. Key Technical Specifications Below are the primary electrical and optical characteristics for the QBLP595-R (Red): | Parameter | Value | | :--- | :--- | | **Color** | Red | | **Package Size** | 0402 (1.0mm x 0.5mm x 0.5mm) | | **Dominant Wavelength** | 620 nm - 630 nm | | **Forward Voltage ($V_F$)** | 1.7V (Min) - 2.5V (Max) @ 20mA | | **Luminous Intensity ($I_V$)** | 50 mcd - 130 mcd @ 20mA | | **Viewing Angle** | 120 Degrees | | **Reverse Current ($I_R$)** | 10 $\mu$A (Max) @ $V_R$ = 5V | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Component Composition & Design The "QBLP595" series is designed for high-density PCB layouts where space is at a premium. * **Material:** It typically utilizes **AlGaInP** (Aluminum Gallium Indium Phosphide) technology, which is standard for high-brightness red and yellow LEDs. * **Encapsulation:** The LED chip is protected by a clear epoxy or silicone water-clear lens, allowing for maximum light output and wide-angle distribution. * **Terminations:** The bottom features gold-plated or tin-plated pads for reflow soldering. --- ### 3. Usage & Applications Due to its extremely small 0402 form factor, the QBLP595-R is commonly found in the following applications: 1. **Status Indicators:** Power-on lights or status signals in portable electronics (smartphones, wearables). 2. **Backlighting:** Illuminating membrane switches or small LCD screens. 3. **Circuit Debugging:** Small enough to be placed on signal traces to provide visual feedback for data transmission or error states. 4. **Edge Lighting:** Used in light pipes for minimalist design aesthetics. --- ### 4. Typical Circuit Example To use this LED with a 5V microcontroller, you must use a current-limiting resistor to prevent burnout. ```cpp // Calculation Example: // Supply Voltage (Vs) = 5V // LED Forward Voltage (Vf) = 2.0V // Target Current (I) = 20mA (0.02A) // Resistor (R) = (Vs - Vf) / I // R = (5 - 2) / 0.02 = 150 Ohms ``` ---