The **HLMP-AD06-RST** is a specific variant of Broadcom’s (formerly Avago) High-Intensity Red LED series. These LEDs are designed for outdoor information signs and traffic signals due to their high luminous output and durability. --- ### 1. General Specifications This part is a **5mm (T-1 ¾) oval precision optical performance LED**. Below is a summary of its core electronic and optical characteristics: | Parameter | Specification | | :--- | :--- | | **Color** | Red (AllnGaP) | | **Peak Wavelength** | 630 nm (Typical) | | **Luminous Intensity** | 460 mcd to 1150 mcd (at 20mA) | | **Viewing Angle** | 70° (Horizontal) x 35° (Vertical) | | **Forward Voltage ($V_f$)** | 1.8V to 2.4V | | **Forward Current ($I_f$)** | 20mA (Typical), 50mA (Max) | | **Package Shape** | Oval / Subminiature | --- ### 2. Key Electronic Features * **Material Composition:** It utilizes **AllnGaP** (Aluminum Indium Gallium Phosphide) technology, which provides high light output efficiency over a wide range of currents. * **Oval Spatial Radiation Pattern:** Unlike standard round LEDs, the oval shape provides a wide horizontal viewing angle and a narrow vertical angle. This is electronically optimized for roadside signs where light needs to be directed at drivers' eye levels rather than into the sky. * **Thermal Stability:** These parts are designed to handle high ambient temperatures common in outdoor enclosures without significant degradation of light output. * **Lead-Free/RoHS:** The part is compliant with modern environmental standards for electronics manufacturing. --- ### 3. Application Use Cases Because of its specific radiation pattern and high intensity, it is commonly found in: 1. **Variable Message Signs (VMS):** Highway and traffic information boards. 2. **Solar Powered Signs:** Due to the high efficiency of the AllnGaP chip. 3. **Commercial Outdoor Advertising:** Large-scale video screens and billboards. --- ### 4. Circuit Implementation Note When designing a circuit for the HLMP-AD06, a current-limiting resistor is mandatory. For a standard 5V supply: ```text R = (V_supply - V_f) / I_f R = (5V - 2.0V) / 0.02A = 150 Ohms ``` ---