The **KA-3SLN-R** is a specific electronic component primarily identified as a **Subminiature Rectangular LED Indicator** manufactured by Kingbright. It is designed for status indication in compact electronic circuits. ### 1. Technical Specifications Below are the primary electrical and optical characteristics of the KA-3SLN-R: | Parameter | Specification | | :--- | :--- | | **Emitting Color** | Red (High Efficiency) | | **Lens Type** | Red Diffused | | **Package Dimensions** | 2mm x 5mm (Rectangular) | | **Forward Voltage ($V_F$)** | 2.0V (Typical) / 2.5V (Max) | | **Forward Current ($I_F$)** | 20mA | | **Luminous Intensity** | 1.2 to 5 mcd @ 20mA | | **Viewing Angle** | 110 degrees | | **Wavelength** | 627 nm (Peak) | --- ### 2. Key Features * **Form Factor:** The subminiature rectangular shape allows for high-density mounting on PCBs where vertical space is limited. * **Diffused Lens:** The red diffused lens ensures wide-angle visibility and a soft glow, making it ideal for status indicators rather than illumination. * **Low Power Consumption:** Operates efficiently at standard logic level currents (typically 10-20mA). * **Reliability:** Rated for long solid-state life and is IC compatible for direct drive from microcontrollers. --- ### 3. Typical Applications The KA-3SLN-R is commonly found in the following scenarios: 1. **Network Equipment:** Link/Activity lights on routers or switches. 2. **Consumer Electronics:** Power indicators for small hand-held devices. 3. **Industrial Panels:** Compact status boards where many LEDs are grouped tightly together. 4. **Diagnostic Tools:** Error code signaling on internal circuit boards. --- ### 4. Basic Circuit Connection To use the KA-3SLN-R with a 5V microcontroller, a current-limiting resistor is required to prevent burning out the LED. **Calculation Example:** $R = (V_{source} - V_F) / I_F$ $R = (5V - 2.0V) / 0.015A \approx 200 \Omega$ ```cpp // Example: Blinking the KA-3SLN-R using an Arduino void setup() { pinMode(13, OUTPUT); // Connect Anode to Pin 13 via 220 ohm resistor } void loop() { digitalWrite(13, HIGH); // LED ON delay(1000); digitalWrite(13, LOW); // LED OFF delay(1000); } ``` ---