In the context of electronics, **LED76** most commonly refers to the **LED76 infrared (IR) emitting diode** (specifically the high-power GaAs/GaAlAs variants) or the **TSAL7600** series. It is an optoelectronic component designed to emit light in the near-infrared spectrum, making it invisible to the human eye but detectable by sensors. --- ### 1. Key Technical Specifications The following table highlights the typical electronic characteristics of a high-performance IR LED like the LED76/TSAL7600: | Parameter | Typical Value | Description | | :--- | :--- | :--- | | **Peak Wavelength** | 940 nm | The wavelength of the emitted infrared light. | | **Forward Voltage ($V_f$)** | 1.3V - 1.6V | The voltage required to turn the LED on. | | **Forward Current ($I_f$)** | 100 mA | The continuous current the LED can handle. | | **Peak Surge Current** | 1.5 A | Maximum current for very short pulses (e.g., remote controls). | | **Radiant Intensity** | 25 - 50 mW/sr | The power of the IR beam per unit angle. | | **Viewing Angle** | ±30° | The spread of the light beam. | --- ### 2. Major Electronic Components & Construction The "LED76" is composed of several internal parts that allow it to function as a semiconductor light source: * **The Semiconductor Die (Chip):** Usually made of Gallium Aluminum Arsenide (GaAlAs). This material is chosen for its high efficiency in converting electricity into infrared photons. * **Anode and Cathode Leads:** * **Anode (+):** The longer lead. * **Cathode (-):** The shorter lead, usually marked by a flat edge on the plastic housing. * **Epoxy Lens:** A blue-tinted or clear plastic casing that focuses the IR light into a specific beam angle. * **Bonding Wire:** A microscopic gold wire that connects the anode lead to the semiconductor die. --- ### 3. Circuit Integration To use an LED76 in an electronic circuit, you must use a **Current Limiting Resistor** to prevent the component from burning out. #### Formula for Resistor ($R$): $$R = \frac{V_{source} - V_f}{I_f}$$ **Example:** Using a 5V power supply: $$R = \frac{5V - 1.3V}{0.1A} = 37 \Omega$$ --- ### 4. Common Applications * **Remote Controls:** Used in TV and Air Conditioning remotes to transmit data packets via IR pulses. * **Infrared Illumination:** Used for night-vision security cameras to light up a room without visible light. * **Optical Switch:** Used in "Photo-interrupters" to detect if an object is passing between the LED and a receiver. * **Data Transmission:** Low-speed wireless communication between devices.