## Overview of HLMP-CE27-R0ADD The **HLMP-CE27-R0ADD** is a high-brightness, precision optical performance LED manufactured by Broadcom (formerly Avago Technologies). It belongs to the T-1¾ (5mm) extra-bright Cyan LED series, commonly used in outdoor signage and informative displays. --- ### 1. Key Technical Specifications The following table summarizes the fundamental electronic and optical characteristics: | Parameter | Specification | | :--- | :--- | | **Color** | Cyan (Blue-Green) | | **Dominant Wavelength** | 505 nm | | **Luminous Intensity (Min/Max)** | 1150 mcd / 2400 mcd | | **Viewing Angle** | 23° | | **Forward Current ($I_F$)** | 30 mA (Typical) | | **Forward Voltage ($V_F$)** | 3.2 V (Typical) | | **Lens Shape** | Circular with Domed Top (5mm) | | **Mounting Type** | Through-Hole | --- ### 2. Physical Construction and Materials * **Chip Technology:** This LED utilizes **InGaN** (Indium Gallium Nitride) technology on a sapphire substrate. This material allows for high light output efficiency even at lower currents. * **Package Type:** T-1¾ (5mm) standard package. * **Lens Tinting:** The part is usually clear and non-diffused to ensure a precise, narrow beam pattern suitable for sunlight readability. * **Lead Frame:** Features an untinted, non-diffused lead frame designed for stable mounting on PCBs (Printed Circuit Boards). --- ### 3. Electronic Behavior To integrate this component into a circuit, the following electronic behaviors must be considered: 1. **Current Limiting:** Like all LEDs, it must be used with a series resistor or a constant current driver to prevent thermal runaway. * *Calculation:* $R = (V_{source} - V_F) / I_F$ 2. **Reverse Voltage:** The device has a maximum reverse voltage ($V_R$) typically around **5V**. Exceeding this can cause permanent damage to the InGaN junction. 3. **Intensity Binning:** The "R0ADD" suffix in the part number refers to specific intensity and color bins, ensuring that large arrays of these LEDs appear uniform in color and brightness. --- ### 4. Common Applications * **Traffic Signals:** Due to the specific 505nm Cyan wavelength, it is often used in pedestrian crossing signs. * **Commercial Outdoor Advertising:** High intensity makes it visible in direct sunlight. * **Variable Message Signs (VMS):** Used in highway and transportation information displays. * **Industrial Equipment:** Status indicators that require high visibility from a distance.