The **VLMW15** series (specifically the VLMW1500) represents a line of high-brightness **White Surface Mount (SMT) LEDs** manufactured by Vishay Semiconductors. These components are designed in the ultra-small 0402 package, making them ideal for space-constrained applications. --- ## 1. Technical Specifications Below is a summary of the typical electrical and optical characteristics for the VLMW1500 series. | Parameter | Symbol | Typical Value | Unit | | :--- | :--- | :--- | :--- | | **Luminous Intensity** | $I_v$ | 180 - 450 | mcd | | **Forward Current** | $I_f$ | 5 - 20 | mA | | **Forward Voltage** | $V_f$ | 2.9 - 3.3 | V | | **Reverse Voltage** | $V_r$ | 5 | V | | **Viewing Angle** | $2\phi$ | 130 | deg | | **Package Size** | - | 1.0 x 0.5 x 0.35 (0402) | mm | --- ## 2. Key Electronic Features ### A. Material Technology The VLMW15 series utilizes **InGaN (Indium Gallium Nitride)** technology. This chip-on-board technology is essential for producing high-efficiency blue light, which is then converted to white light via a yellow phosphor coating. ### B. Thermal and Power Management * **Operating Temperature:** Generally rated from $-40\text{°C}$ to $+85\text{°C}$. * **Power Dissipation:** Very low, typically around $70\text{ mW}$, allowing for high-density mounting without excessive heat build-up. * **ESD Resistance:** These devices are sensitive to static; they are usually rated up to $2\text{ kV}$ according to the JESD22-A114-B standard. ### C. Optical Properties * **High Luminous Intensity:** Despite the 0402 footprint, it offers high brightness. * **Wide Viewing Angle:** The $130^\circ$ angle ensures uniform light distribution, making it suitable for backlighting. --- ## 3. Applications Due to their miniature size and high efficiency, they are commonly used in: * **Mobile Devices:** Backlighting for keypads and LCDs. * **Automotive:** Dashboard indicators and small scale interior lighting. * **Industrial:** Status indicators on dense PCB layouts. * **Wearables:** Smartwatches and fitness trackers. --- ## 4. Soldering and Handling The part is designed for **Lead (Pb)-free reflow soldering** processes. ```markdown Note: Because it is an 0402 package, precision pick-and-place machines are required. Manual soldering is difficult and not recommended for production environments. ```