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The LTST-C191KRKT is an SMD LED manufactured by LITE-ON. Below are its key specifications, descriptions, and features:

Specifications:

• Color: Red
• Wavelength: 625 nm (typical)
• Luminous Intensity: 120 mcd (minimum) at 20 mA
• Forward Voltage (Vf): 2.0 V (typical) at 20 mA
• Reverse Voltage (Vr): 5 V (maximum)
• Viewing Angle: 120°
• Package Type: 0603 (1608 metric)
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -40°C to +100°C

Descriptions:

• Type: Surface-mount LED
• Polarity: Anode/Cathode marked
• RoHS Compliance: Yes
• Moisture Sensitivity Level (MSL): 1 (Unlimited floor life at ≤30°C/85% RH)

Features:

• High brightness and reliability
• Wide viewing angle (120°)
• Compact 0603 package for space-saving designs
• Suitable for backlighting, indicators, and general-purpose lighting
• Lead-free and RoHS compliant

This LED is commonly used in consumer electronics, automotive displays, and industrial applications.

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# Application Scenarios and Design Phase Pitfall Avoidance for the LTST-C191KRKT LED

The LTST-C191KRKT is a high-performance surface-mount LED designed for a variety of applications where brightness, efficiency, and reliability are critical. This red LED, part of the Lite-On portfolio, offers excellent luminous intensity and low power consumption, making it suitable for both consumer electronics and industrial applications.

## Key Application Scenarios

1. Consumer Electronics

The LTST-C191KRKT is widely used in devices such as smart home appliances, wearables, and audio-visual equipment. Its compact size (0603 package) and high brightness make it ideal for status indicators, backlighting, and notification LEDs in smartphones, tablets, and remote controls.

2. Automotive Displays

In automotive interiors, this LED serves as an indicator for dashboard controls, infotainment systems, and ambient lighting. Its robust design ensures stable performance under varying temperatures and vibrations, meeting automotive-grade reliability requirements.

3. Industrial Control Systems

Industrial machinery and control panels often require clear visual feedback. The LTST-C191KRKT’s high luminous intensity ensures visibility even in brightly lit environments, making it suitable for HMI (Human-Machine Interface) applications.

4. Medical Devices

Medical equipment, such as diagnostic tools and patient monitoring systems, benefit from this LED’s consistent performance and low power consumption. Its reliability is crucial in environments where failure is not an option.

## Design Phase Pitfall Avoidance

To maximize the performance and longevity of the LTST-C191KRKT, designers should consider the following key factors during the development phase:

1. Proper Current Limiting

Exceeding the recommended forward current (typically 20mA) can lead to premature failure. Always use a current-limiting resistor or a constant-current driver to ensure stable operation.

2. Thermal Management

While the LED is efficient, prolonged operation at high currents can generate heat. Ensure adequate PCB thermal dissipation or use heat sinks if necessary, especially in enclosed spaces.

3. Reverse Voltage Protection

The LTST-C191KRKT is sensitive to reverse voltage. Incorporate protection diodes in the circuit to prevent damage from accidental polarity reversal.

4. Optical Considerations

Placement and lens design affect light dispersion. Avoid placing the LED too close to diffusers or reflective surfaces that may cause uneven illumination or hotspots.

5. Environmental Factors

For outdoor or harsh environments, ensure proper conformal coating or encapsulation to protect against moisture, dust, and UV exposure.

By addressing these considerations early in the design process, engineers can avoid common pitfalls and ensure optimal performance of the LTST-C191KRKT in their applications. Careful planning and adherence to datasheet specifications will result in reliable, long-lasting LED implementations.