Based on common industry labeling, **LED021** typically refers to a specific type of **SMD (Surface Mount Device) LED module** or a high-intensity lighting component often used in automotive lighting, signage, or decorative strips. Below is an overview of the electronic specifications and parts associated with this component. --- ### 1. General Specifications The LED021 is generally categorized as a mid-power light-emitting diode. Its performance depends on the manufacturer (often associated with brands like Samsung or generic industrial suppliers), but the standard parameters are as follows: | Parameter | Typical Value | | :--- | :--- | | **Forward Voltage (Vf)** | 2.8V - 3.4V DC | | **Forward Current (If)** | 20mA - 60mA (Normal) / Up to 150mA (Max) | | **Power Dissipation** | 0.2W - 0.5W | | **Luminous Intensity** | 20 - 30 Lumens | | **Viewing Angle** | 120° | --- ### 2. Key Electronic Parts and Construction An LED021 module is not just a single piece of plastic; it is composed of several critical electronic sub-parts: #### A. The LED Die (Semiconductor) The heart of the component. It is usually made from **InGaN (Indium Gallium Nitride)** for blue/white light or **AlGaInP** for red/yellow light. This is where the electroluminescence occurs. #### B. Lead Frame The metal structure that provides mechanical support and electrical connections. * **Anode (+):** The positive terminal. * **Cathode (-):** The negative terminal (often marked by a small notch on the corner of the LED body). #### C. Phosphor Coating Since "White" LEDs do not exist naturally, a blue LED021 die is coated with a **Yellow Phosphor layer**. When blue light hits the phosphor, it converts some of it to yellow; the mixture of blue and yellow results in white light. #### D. Encapsulant (Epoxy/Silicone) A clear or diffused resin that protects the die from oxidation and moisture. In "021" variants, this is often a high-thermal-stability silicone to prevent yellowing over time. --- ### 3. Circuit Integration Requirements To use an LED021 part in a circuit, you must include the following peripheral components: 1. **Current Limiting Resistor:** Essential to prevent thermal runaway. * *Formula:* $R = (V_{source} - V_{f}) / I_{f}$ 2. **Heat Sink/Thermal Pad:** Because these are often SMD components, the PCB (Printed Circuit Board) usually requires a "thermal via" or a copper plane to dissipate heat, as heat is the primary cause of LED failure. 3. **Driver IC (Optional):** For dimming or pulse-width modulation (PWM) control. --- ### 4. Common Applications * **Backlighting:** LCD screens and instrument clusters. * **Automotive:** Interior cabin lights or side indicators. * **Strip Lighting:** High-density LED strips for architectural accents.