The **SST-90-R-R11-HJ** is a high-performance, high-output Power LED manufactured by **Luminus Devices**. It belongs to the SST-90 series, known for its massive light-emitting surface and extreme brightness, often used in professional lighting, searchlights, and medical equipment. --- ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify the specific characteristics of this component: | Segment | Meaning | Detail | | :--- | :--- | :--- | | **SST** | Package Type | Surface Mount (Ceramic) | | **90** | Die Size | 9.0 $mm^2$ emitting area | | **R** | Color | Red (Visible Spectrum) | | **R11** | Binning Code | Specific chromaticity/wavelength bin | | **HJ** | Flux/Voltage Bin | Defines the brightness (Lumen) and Forward Voltage range | --- ### 2. Key Technical Specifications The SST-90 series is characterized by its ability to handle very high currents compared to standard LEDs. | Parameter | Value (Typical) | | :--- | :--- | | **Wavelength** | ~620 nm - 630 nm (Deep Red) | | **Max Drive Current** | 9.0 A (Amperes) | | **Forward Voltage ($V_f$)** | 2.0V to 2.5V (at high current) | | **Power Consumption** | Up to ~22.5 Watts | | **Viewing Angle** | 100° - 120° | | **Thermal Resistance** | 0.5 °C/W (extremely low, efficient cooling) | --- ### 3. Electronic Design Considerations #### A. Thermal Management Because this LED draws up to 9 Amps, it generates significant heat. * **MCPCB:** It must be mounted on a Metal Core Printed Circuit Board (usually copper) to pull heat away from the die. * **Heatsink:** Active cooling (fans) or large passive aluminum fins are required to prevent thermal runaway or permanent damage. #### B. Driving Circuitry Standard "current limiting resistors" are insufficient for this part. * **Constant Current Driver:** You must use a specialized DC-DC buck or boost converter designed for high-current LEDs. * **PWM Dimming:** The SST-90 supports Pulse Width Modulation (PWM) for brightness control, provided the driver circuit can switch at high speeds. #### C. Optical Properties The 9 $mm^2$ monolithic die is unusually large. While this produces a massive amount of light, it requires large reflectors or specialized TIR (Total Internal Reflection) lenses if a tight beam is needed. --- ### 4. Common Applications * **Emergency Vehicle Lighting:** High-intensity red strobes. * **Architecture:** Large-scale red wash lighting. * **Medical:** Photodynamic therapy or specialized imaging. * **Signaling:** High-visibility beacons and airfield lighting.