The **L59D-R2-T** is a specific part number typically associated with **THT (Through-Hole Technology) LED Indicators**, specifically those produced by manufacturers like Kingbright or similar optoelectronic component suppliers. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. General Overview This component is a **5mm (T-1 3/4) Round Solid State Lamp**. It is designed for status indication in various electronic circuits. | Feature | Specification | | :--- | :--- | | **Type** | LED (Light Emitting Diode) | | **Diameter** | 5mm (T-1 3/4) | | **Color** | High Efficiency Red | | **Lens Type** | Red Diffused | | **Mounting** | Through-Hole (THT) | --- ### 2. Absolute Maximum Ratings ($T_a = 25^\circ C$) These values represent the limits the component can withstand without sustaining damage. | Parameter | Symbol | Value | Unit | | :--- | :--- | :--- | :--- | | Power Dissipation | $P_D$ | 75 | mW | | DC Forward Current | $I_F$ | 30 | mA | | Peak Forward Current | $I_{FP}$ | 160 | mA | | Reverse Voltage | $V_R$ | 5 | V | | Operating Temperature | $T_{opr}$ | -40 to +85 | $^\circ C$ | --- ### 3. Electrical & Optical Characteristics These values describe how the part performs under standard operating conditions ($I_F = 20mA$). | Parameter | Typical Value | Max Value | Unit | | :--- | :--- | :--- | :--- | | **Forward Voltage ($V_F$)** | 2.0 | 2.5 | V | | **Luminous Intensity ($I_v$)** | 30 | 60 | mcd | | **Wavelength ($\lambda p$)** | 627 | - | nm | | **Viewing Angle ($2\theta_{1/2}$)** | 40 | - | degrees | --- ### 4. Key Component Features * **High Efficiency:** Uses Gallium Arsenide Phosphide on Gallium Phosphide (GaAsP/GaP) technology for reliable red light output. * **Diffused Lens:** The "D" in the part number usually signifies a **Diffused** lens, which scatters light to provide a wide viewing angle and a uniform glow rather than a sharp point of light. * **Long Life:** Solid-state reliability ensures a long operational lifespan compared to incandescent bulbs. * **IC Compatible:** Low power consumption allows it to be driven directly by most integrated circuits or microcontrollers (with a current-limiting resistor). --- ### 5. Application Circuit Example To use this LED with a 5V microcontroller (like an Arduino), you must use a current-limiting resistor ($R$) to prevent burnout. ```cpp // Basic Calculation for Resistor: // R = (V_source - V_forward) / I_desired // R = (5V - 2.0V) / 0.02A = 150 Ohms ``` ---