The **HLMP-AD06-RSTXX** is a high-intensity, precision optical performance Oval LED manufactured by Broadcom (formerly Avago Technologies). These LEDs are specifically engineered for outdoor signage and passenger information signs. ### 1. Key Technical Specifications | Parameter | Value / Detail | | :--- | :--- | | **LED Color** | Red | | **Dominant Wavelength** | 626 nm (Typical) | | **Luminous Intensity** | 460 mcd to 1150 mcd (at 20mA) | | **Viewing Angle** | 30° x 70° (Oval/Elliptical) | | **Package Type** | 5mm (T-1 ¾) Through-Hole | | **Lens Material** | Epoxy (Tinted/Diffused) | | **Forward Voltage ($V_f$)** | 1.8V to 2.4V | --- ### 2. Physical and Material Characteristics The HLMP-AD06 series uses **AllnGaP** (Aluminum Indium Gallium Phosphide) technology. This material is chosen for its high luminous efficiency and stable performance over a wide range of temperatures. * **Oval Radiation Pattern:** Unlike standard round LEDs that project a circular beam, the "Oval" part indicates it has a wider horizontal viewing angle than vertical. This is ideal for screens where viewers are at different side angles but roughly the same height. * **Standoff Leads:** The "RSTXX" suffix often refers to specific packaging and lead configurations (like bulk or tape/reel) and whether the leads have "standoffs" (small bumps on the legs) to ensure proper spacing from the PCB during soldering. --- ### 3. Pinout and Circuitry The device follows the standard polarity for through-hole LEDs. ```cpp // Schematic Representation (Anode) + ----|>|---- - (Cathode) (Long Lead) (Short Lead/Flat Side) ``` **Implementation Tip:** When driving this LED from a 5V source, a current-limiting resistor is required. To target 20mA: $R = (V_{source} - V_f) / I$ $R = (5V - 2.0V) / 0.020A = 150 \Omega$ --- ### 4. Primary Applications * **Variable Message Signs (VMS):** Highway traffic boards. * **Commercial Outdoor Signs:** Advertising billboards. * **Passenger Information:** Train station and bus stop displays. * **Solar Powered Signs:** Due to the high efficiency of AllnGaP material. ---