## Overview of the AP8003TBC-R1 The **AP8003TBC-R1** is a high-brightness Blue Surface Mount Device (SMD) LED. It is commonly used in backlighting, status indicators, and consumer electronics due to its compact size and efficiency. --- ### 1. Technical Specifications The following table summarizes the key electrical and optical characteristics of the AP8003TBC-R1: | Parameter | Specification | Unit | | :--- | :--- | :--- | | **Emitted Color** | Blue | - | | **Lens Appearance** | Water Clear | - | | **Peak Wavelength** | ~468 nm | nm | | **Dominant Wavelength** | ~470 nm | nm | | **Forward Voltage ($V_F$)** | 3.3 (Typical) / 4.0 (Max) | V | | **Forward Current ($I_F$)** | 20 | mA | | **Luminous Intensity ($I_V$)** | 70 - 150 (Typical) | mcd | | **Viewing Angle** | 120 | Degrees | --- ### 2. Key Internal Components The AP8003TBC-R1 is composed of several critical electronic and physical parts: * **LED Die (Chip):** The heart of the component, usually made of **InGaN** (Indium Gallium Nitride) to produce the blue light spectrum. * **Lead Frame:** Provides the electrical connection points (Anode and Cathode) and acts as a thermal path to dissipate heat. * **Encapsulation:** A clear epoxy or silicone resin that protects the die from oxidation and moisture while allowing maximum light transmission. * **Bonding Wire:** A microscopic gold wire that connects the LED chip to the lead frame terminals. --- ### 3. Application Circuits When integrating this part into a circuit, a current-limiting resistor is required to prevent thermal runaway. #### Standard DC Connection: ```text [Vcc] ---- [Resistor] ---- [LED Anode (+) | LED Cathode (-)] ---- [GND] ``` #### Resistor Calculation Example: To run the LED at 20mA from a 5V source: 1. **Formula:** $R = (V_{source} - V_F) / I_F$ 2. **Calculation:** $R = (5V - 3.3V) / 0.020A = 85 \Omega$ 3. **Standard Value:** Use a **91 $\Omega$** or **100 $\Omega$** resistor for safety. --- ### 4. Physical Dimensions & Packaging * **Package Size:** 0805 (Metric 2012) — approximately $2.0mm \times 1.25mm$. * **Mounting Type:** Surface Mount (SMT). * **Polarity:** Usually marked with a green T-bar or a notch on the cathode side of the underside.