## Technical Overview of the LS3336-R LED The **LS3336-R** is a high-brightness Super-Red LED manufactured by OSRAM Opto Semiconductors (now ams OSRAM). It belongs to the **Multi TOPLED** or **Mini TOPLED** family, specifically designed for surface-mount technology (SMT) applications requiring compact size and high reliability. --- ### 1. Key Technical Specifications The electrical and optical characteristics of the LS3336-R are critical for circuit design. | Parameter | Symbol | Value (Typical) | Unit | | :--- | :--- | :--- | :--- | | **Color** | - | Super-Red | - | | **Dominant Wavelength** | $\lambda_{dom}$ | 633 | nm | | **Forward Voltage** | $V_f$ | 2.0 (Max 2.6) | V | | **Forward Current** | $I_f$ | 20 | mA | | **Luminous Intensity** | $I_v$ | 112 - 280 | mcd | | **Viewing Angle** | $2\phi$ | 120 | degrees | | **Operating Temperature** | $T_{op}$ | -40 to +100 | °C | --- ### 2. Physical Construction The "R" suffix and the part number prefix define the physical and material composition: * **Package Type:** SMT (Surface Mount Technology) package, usually in a PLCC-2 housing. * **Material:** AlGaInP (Aluminum Gallium Indium Phosphide) on GaAs substrate. This material technology provides high efficiency and long life compared to older GaAsP technologies. * **Encapsulation:** Clear, colorless resin, which allows for a wide 120° radiation pattern. --- ### 3. Electronic Design Considerations When integrating the LS3336-R into a circuit, keep the following electronic constraints in mind: #### A. Current Limiting To prevent thermal runaway or burnout, a series resistor must be used. * **Formula:** $R = (V_{source} - V_f) / I_f$ * *Example:* For a 5V supply at 20mA: $(5V - 2.0V) / 0.02A = 150 \Omega$. #### B. Thermal Management While the LS3336-R is small, heat dissipation is managed through the PCB solder pads. Ensure adequate copper area to maintain the junction temperature below $125^\circ C$. #### C. Reverse Voltage This LED has a maximum reverse voltage ($V_r$) of **12V**. Exceeding this will cause permanent damage to the semiconductor junction. --- ### 4. Common Applications Due to its reliability and specific wavelength, it is commonly used in: * **Automotive:** Dashboard illumination, switches, and interior lighting. * **Industrial:** Status indicators on control panels. * **Backlighting:** LCDs, symbols, and illuminated push-buttons.