## HLMP-AD01-R0RYY: Technical Overview The **HLMP-AD01-R0RYY** is a high-intensity, precision optical performance Oval LED manufactured by Broadcom (formerly Avago Technologies). It is primarily designed for outdoor electronic signs and signals. --- ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **LED Color** | Red | | **Dominant Wavelength** | 626 nm | | **Luminous Intensity** | 460 mcd (Min) to 1150 mcd (Max) | | **Viewing Angle** | 30° x 70° (Oval) | | **Forward Current ($I_F$)** | 20 mA (Typical) | | **Forward Voltage ($V_F$)** | 2.0 V to 2.4 V | | **Lens Shape** | Oval 4mm / 5mm Subminiature | | **Mounting Type** | Through-Hole | --- ### 2. Core Electronic Characteristics #### A. The Oval Radiation Pattern Unlike standard round LEDs, the "AD" series features an **oval-shaped radiation pattern**. * **Horizontal Viewing Angle:** Wide (70°) to ensure visibility for pedestrians or drivers from the side. * **Vertical Viewing Angle:** Narrower (30°) to concentrate light toward the viewer and reduce light pollution into the sky. #### B. Material Composition This LED is built using **AlInGaP (Aluminum Indium Gallium Phosphide)** technology. This material is preferred for high-brightness applications because it offers: * High luminous efficiency. * Stable performance across a wide temperature range. * Excellent reliability for long-term outdoor use. #### C. Electrical Protection The device typically requires a current-limiting resistor to operate safely. ```python # Simple Ohm's Law calculation for a 5V supply V_supply = 5.0 V_forward = 2.1 I_desired = 0.020 # 20mA R_limit = (V_supply - V_forward) / I_desired print(f"Required Resistor: {R_limit} Ohms") # Result: 145 Ohms (Use 150 Ohm standard resistor) ``` --- ### 3. Part Number Decoding (R0RYY) The suffix **R0RYY** defines the specific binning and packaging for this component: * **R0:** Intensity Bin (Refers to the brightness range). * **R:** Color Bin (Refers to the specific wavelength range within the Red spectrum). * **YY:** Packaging/Mechanical option (Usually refers to specific lead lengths or tape-and-reel options). --- ### 4. Common Applications * **VMS (Variable Message Signs):** Traffic alerts and highway information. * **Outdoor Advertising:** Large-scale LED billboards. * **Commercial Signage:** Gas station price displays and store signs.