### HLMP-CB27-R0CDD: Technical Overview The **HLMP-CB27-R0CDD** is a high-brightness Blue LED manufactured by Broadcom (formerly Avago Technologies). It is part of the HLMP-Cx27 series, which consists of T-1 ¾ (5mm) precision optical performance oval LEDs specifically designed for outdoor applications. --- ### Key Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **LED Type** | T-1 ¾ (5mm) Oval | | **Color** | Blue (InGaN Material) | | **Peak Wavelength** | ~470 nm | | **Luminous Intensity** | 460 mcd to 1150 mcd (typical) | | **Viewing Angle** | 70° (Horizontal) x 35° (Vertical) | | **Forward Current (If)** | 30 mA (Maximum) | | **Forward Voltage (Vf)** | 3.2V (Typical) to 4.0V (Maximum) | | **Lens Appearance** | Blue Tinted / Diffused | --- ### Core Electronic Characteristics #### 1. Material Technology The device uses **InGaN (Indium Gallium Nitride)** technology. This material is essential for high-efficiency blue and green light emission. It allows for high light output even under sunlight, which is a primary requirement for outdoor signage. #### 2. Radiation Pattern (Oval Shape) Unlike standard round LEDs, this part has an **Oval radiation pattern**. * **Horizontal Span (70°):** Provides a wide viewing area for pedestrians or drivers. * **Vertical Span (35°):** Concentrates light to prevent "spillage" into the sky, maximizing the efficiency of the light used for the target audience. #### 3. Binning and Grading The suffix **"R0CDD"** refers to specific binning categories: * **Intensity Bin:** Defines the brightness range. * **Color Bin:** Ensures color consistency across a large display (crucial for video walls). --- ### Typical Applications * **Full-Color Signage:** Used as the "Blue" pixel in RGB outdoor video screens. * **Commercial Advertising:** Billboards and stadium displays. * **Passenger Information Signs:** Bus and train station arrivals/departures. --- ### Electrical Precautions (Schematic Design) When integrating this part into a circuit, consider the following code snippet for calculating the limiting resistor: ```cpp // Example: Calculating series resistor for 5V supply float supplyVoltage = 5.0; float forwardVoltage = 3.2; // Typical Vf for HLMP-CB27 float targetCurrent = 0.020; // 20mA target for longevity float resistorValue = (supplyVoltage - forwardVoltage) / targetCurrent; // Result: 90 Ohms (Standard value: 91 or 100 Ohms) ```