The **C5SMF-RJS-CT34QBB1** is a high-brightness, through-hole LED manufactured by **Cree LED** (now part of SGH). It is specifically designed for outdoor video screens and signage applications. --- ### 1. General Specifications This part is a Red LED in a standard 5mm package with an oval-shaped lens. | Parameter | Specification | | :--- | :--- | | **Color** | Red (621 nm - 634 nm) | | **Package Type** | 5mm Round (Oval lens) | | **Luminous Intensity** | 1100 mcd - 3000 mcd | | **Viewing Angle** | 70° (Horizontal) x 35° (Vertical) | | **Lens Appearance** | Tinted, Diffused | | **Mounting Type** | Through-Hole | --- ### 2. Detailed Technical Characteristics The part number is a specific "bin" code that defines the performance characteristics: #### **A. Optical Characteristics** * **Wavelength:** The "RJS" code indicates a Red color with a dominant wavelength typically centered around **628nm**. * **Oval Shape:** The 70°/35° radiation pattern is intentional. It spreads light wide horizontally (for viewers on a street) but narrows it vertically to minimize light waste toward the sky. * **Intensity Binning:** The "CT34QBB1" suffix dictates the specific range of brightness and color binning the manufacturer guarantees for this batch. #### **B. Electrical Ratings** * **Forward Current ($I_f$):** Typically rated for **50mA** maximum (continuous), though it is often driven at 20mA. * **Forward Voltage ($V_f$):** Approximately **2.1V** (typical) to **2.6V** (maximum). * **Reverse Voltage:** 5V maximum. * **Operating Temperature:** -40°C to +100°C. --- ### 3. Application Use Cases Because of its high durability and specific light dispersion, this part is used in: 1. **Variable Message Signs (VMS):** Highway traffic boards. 2. **Outdoor Video Displays:** Large stadium screens or billboards. 3. **Petrol Station Signs:** Price changers. 4. **Traffic Signals:** Pedestrian and road signals. --- ### 4. Key Advantages * **UV Resistance:** The epoxy contains UV inhibitors to prevent the lens from yellowing or becoming brittle under direct sunlight. * **Stopper Leads:** Most variations of the C5SMF series include "stoppers" on the leads to ensure the LED sits at a consistent height above the PCB. * **High Contrast:** The tinted lens ensures that the LED appears red even when turned off, improving the contrast ratio of outdoor screens.