## Technical Overview: VLMW41 Series LEDs The **VLMW41** series refers to a family of high-brightness **Surface Mount Device (SMD)** White LEDs manufactured by Vishay Semiconductors. These components are designed using **PLCC-2** packaging technology and are widely used in automotive, industrial, and consumer electronics due to their high reliability and efficiency. --- ### 1. Key Technical Specifications Below are the typical electrical and optical characteristics for the VLMW41 series: | Parameter | Symbol | Typical Value | Unit | | :--- | :--- | :--- | :--- | | **Luminous Intensity** | $I_v$ | 160 - 450 | mcd | | **Forward Current** | $I_f$ | 20 | mA | | **Forward Voltage** | $V_f$ | 3.3 (Max 4.0) | V | | **Reverse Voltage** | $V_r$ | 5 | V | | **Power Dissipation** | $P_{tot}$ | 80 | mW | | **Viewing Angle** | $\phi$ | 120 | degrees | | **Operating Temp** | $T_{amb}$ | -40 to +100 | °C | --- ### 2. Physical Construction & Features * **Package Type:** PLCC-2 (Plastic Leaded Chip Carrier). * **Technology:** InGaN (Indium Gallium Nitride) on Sapphire. * **ESD Resistance:** Up to 2 kV according to JESD22-A114-B. * **Materials:** Lead-free (Pb-free) and RoHS compliant. * **Color Coordinates:** Categorized according to the CIE 1931 chromaticity diagram (White). --- ### 3. Pinout and Circuit Design The VLMW41 is a polarized two-terminal device. Proper orientation is critical for operation. ```text Top View (PLCC-2) ___________________ | | | | (-) | (+) | <-- Flat corner/Notch usually | Cathode| Anode | indicates Cathode (-) |_________|_________| ``` #### Basic Driving Circuit To operate the LED safely at 20mA from a 5V source: $$R = \frac{V_{source} - V_f}{I_f} = \frac{5V - 3.3V}{0.02A} = 85 \Omega$$ --- ### 4. Common Applications * **Automotive:** Dashboard illumination, switches, and interior lighting. * **Telecommunications:** Indicator lights in telephones and modems. * **Industrial:** Control unit signaling and backlighting for LCDs. * **General:** Decorative lighting and status indicators. ---