The **A42180-R** is a high-power Surface Mount Device (SMD) Light Emitting Diode (LED) from the **Z-Power LED Z5 series**, manufactured by **Seoul Semiconductor**. It is specifically designed for high-intensity lighting applications, combining high efficacy with a small form factor. --- ## 1. Key Technical Specifications The following table outlines the core electronic and optical characteristics of the A42180-R: | Parameter | Characteristic | Value (Typical) | | :--- | :--- | :--- | | **Color** | White | Cool White / Warm White (CCT dependent) | | **Forward Current** | Max Continuous | 1000 mA | | **Forward Voltage** | $V_f$ | 3.2V (at 350mA) | | **Power Dissipation** | Max | ~3.5 Watts | | **Luminous Flux** | Brightness | 100 - 120 Lumens (at 350mA) | | **Viewing Angle** | Beam Spread | 120° | | **Operating Temp** | Thermal Range | -40°C to +85°C | --- ## 2. Structural and Material Features ### Packaging (Z5 Series) The "R" suffix often refers to the specific binning or the ceramic substrate packaging. - **Ceramic Substrate:** It utilizes a ceramic base which provides superior thermal management compared to standard plastic PLCC packages. - **Silicon Lens:** The LED is capped with a clear silicone dome to protect the die while maximizing light extraction. ### Thermal Management One of the most critical "parts" of this electronic component is its **thermal pad**. - The underside features an electrically isolated thermal pad. - This allows the LED to be soldered directly to a Metal Core PCB (MCPCB) to sink heat away from the junction, preventing "Thermal Runaway." --- ## 3. Electrical Integration (Circuit Design) When integrating the A42180-R into an electronic circuit, several factors must be considered: ### A. Driving Method Since LEDs are current-controlled devices, the A42180-R should be driven by a **Constant Current Driver** rather than a constant voltage source. ```python # Example Calculation for a simple series resistor (Not recommended for high power) # V_source = 12V, V_forward = 3.2V, I_target = 0.35A R = (V_source - V_forward) / I_target R = (12 - 3.2) / 0.35 R = 25.14 Ohms (Power Rating > 3W required) ``` ### B. Binning (The "R" Suffix) Seoul Semiconductor uses a specific binning code for these LEDs. The **R** usually identifies: 1. **Luminous Intensity Bin:** The specific range of brightness. 2. **Color Bin:** The specific coordinates on the CIE chromaticity diagram. --- ## 4. Typical Applications * **Flashlights:** Due to high flux density. * **Automotive Lighting:** Daytime running lights or interior illumination. * **General Illumination:** Street lamps, spotlights, and architectural lighting. * **LCD Backlighting:** Used in high-end displays.