## Overview of QBLP653-R The **QBLP653-R** is a high-brightness Red Surface Mount Device (SMD) LED manufactured by **QT-Brightek**. It belongs to the 1206 package size category, which is widely used in electronic displays, status indicators, and backlight applications due to its balance between size and ease of soldering. --- ### Key Technical Specifications The following table summarizes the primary electrical and optical characteristics of the QBLP653-R (typically measured at $I_F = 20mA$). | Parameter | Specification | Unit | | :--- | :--- | :--- | | **Emitted Color** | Red | - | | **Dominant Wavelength** | 620 - 630 | nm | | **Luminous Intensity ($I_v$)** | 80 - 160 (Typical) | mcd | | **Forward Voltage ($V_F$)** | 1.7 - 2.5 | V | | **Forward Current ($I_F$)** | 20 | mA | | **Viewing Angle ($2\theta_{1/2}$)** | 140 | Degrees | | **Package Size** | 3.2 x 1.6 x 1.1 (1206) | mm | --- ### Component Features 1. **Package Type:** 1206 SMD (Surface Mount Device). The "1206" refers to the dimensions (0.12 x 0.06 inches). 2. **Clear Lens:** The component features a water-clear epoxy lens, which allows for a high-intensity, focused output compared to diffused lenses. 3. **Wide Viewing Angle:** With a $140^{\circ}$ viewing angle, the light distribution is broad, making it ideal for backlighting buttons or panels. 4. **Reliability:** Built using AlGaInP (Aluminium Gallium Indium Phosphide) technology, which offers high efficiency and long life. --- ### Application Circuit Example To use the QBLP653-R with a 5V microcontroller (like an Arduino), a current-limiting resistor is required. **Calculation:** $R = \frac{V_{source} - V_F}{I_F} = \frac{5V - 2.0V}{0.02A} = 150 \Omega$ ```cpp // Example: Blinking a status LED on a PCB void setup() { pinMode(13, OUTPUT); // Connected to QBLP653-R via 150 ohm resistor } void loop() { digitalWrite(13, HIGH); // LED ON delay(1000); digitalWrite(13, LOW); // LED OFF delay(1000); } ``` --- ### Common Applications * **Industrial:** Status indicators on control panels. * **Consumer Electronics:** Backlighting for LCDs and switches. * **Automotive:** Dashboard lighting and interior accents. * **Computing:** Network activity indicators (Routers/Modems).