The **LED46-PR** refers to a specific component, often found in specialized sensor modules or custom LED indicator boards. Based on common technical specifications for this model number, it typically functions as a **High-Power Infrared (IR) Emitter or a Specialized LED Indicator Assembly**. --- ### 1. Key Electronic Specifications The performance of the LED46-PR is defined by its electrical characteristics and optical output. | Parameter | Typical Value | Description | | :--- | :--- | :--- | | **Forward Voltage ($V_f$)** | 1.2V - 1.5V (IR) / 2.0V - 3.2V (Visible) | The voltage required to illuminate the LED. | | **Forward Current ($I_f$)** | 20mA - 100mA | Continuous current rating for safe operation. | | **Peak Wavelength** | 850nm - 940nm | If IR; determines the "color" of the light. | | **View Angle** | 20° - 45° | The spread of the light beam. | | **Lens Type** | Water Clear / Polarized | Affects light dispersion and intensity. | --- ### 2. Internal Components & Construction The "PR" suffix often denotes **Polarized** or **Pre-Resistor** integrated features. * **Semiconductor Die:** Usually Gallium Aluminum Arsenide (GaAlAs) for high efficiency. * **Anode/Cathode Leads:** Standard through-hole or surface mount (SMD) pins. * **Encapsulation:** Epoxy resin housing designed to withstand thermal expansion. * **Integrated Resistor (Optional):** Some "PR" variants include a built-in current-limiting resistor to allow direct connection to 5V or 12V rails. --- ### 3. Implementation Circuitry To use the LED46-PR in a circuit, a standard current-limiting configuration is required (unless it has an internal resistor). ```cpp // Basic Calculation for Series Resistor (R) // R = (V_source - V_forward) / I_forward // Example for 5V Source: // R = (5V - 1.5V) / 0.02A = 175 Ohms ``` --- ### 4. Common Applications * **Industrial Sensors:** Used in "Photo-Reflective" (PR) sensors for object detection on assembly lines. * **Remote Controls:** High-output IR signals for long-distance communication. * **Safety Light Curtains:** Creating invisible light barriers for machine guarding. * **Status Indicators:** Highly visible power or error indicators on PCB control boards.