Oktober 20, 2025
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In today's electronics market, demand for compact, energy-efficient indicator LEDs continues to grow across consumer electronics, automotive, and industrial applications. The QTLP601CYTR from Everlight Electronics stands out with its 589nm yellow wavelength and 0603 package size, offering designers a balance of visibility and space savings. This article explores its technical specifications, selection criteria, and emerging applications to help purchasing managers make informed decisions. Read on to discover why this LED is gaining traction in next-generation device designs.l
The QTLP601CYTR is a surface-mount yellow LED in an ultra-compact 0603 (1608 metric) package, manufactured by industry leader Everlight Electronics. Key characteristics include:
| Parameter | Value | Source |
|---|---|---|
| Dominant Wavelength | 589nm (peak at 590nm) | Everlight Datasheet |
| Forward Voltage (Typ) | 2V @ 20mA | Everlight Datasheet |
| Luminous Intensity | 35mcd | Everlight Datasheet |
| Viewing Angle | 120° | Everlight Datasheet |
| Package Dimensions | 1.60mm x 0.80mm x 0.60mm | IEC 60191-2 |
| Lens Style | Rectangle with flat top (clear colorless) | Everlight Datasheet |
Space-constrained designs: Its 0603 footprint (1.6mm x 0.8mm) is ideal for miniaturized PCBs
Yellow indication needs: 589nm wavelength provides distinct visibility in status indicators
Wide viewing applications: 120° angle ensures visibility from multiple orientations
Automated assembly: Tape & reel packaging compatible with high-speed pick-and-place
| Model | QTLP601CYTR | Kingbright APT1608SYCK | Lite-On LTST-C191YKT |
|---|---|---|---|
| Wavelength | 589nm | 585nm | 590nm |
| Intensity | 35mcd | 30mcd | 40mcd |
| Viewing Angle | 120° | 110° | 130° |
| Key Advantage | Balanced performance | Lower cost | Higher brightness |
Used in smart home devices for power/connectivity status due to its high visibility at low current (20mA).
Implemented in secondary instrument lighting where yellow complements red/blue indicators without color blending.
Selected for equipment status lights because of its wide viewing angle (120°) and stable performance across temperature ranges.
According to MarketsandMarkets®, the global SMD LED market will grow at 6.2% CAGR through 2027, driven by:
Increasing adoption in IoT devices
Automotive interior lighting advancements
Demand for energy-efficient indicators
The QTLP601CYTR is well-positioned for these trends with its low power consumption (2V forward voltage) and miniaturized form factor.
A: Under normal operating conditions (20mA, 25°C), Everlight rates these LEDs for 50,000 hours of operation before lumen maintenance drops below 70%.
A: While the LED itself can function outdoors, it requires proper UV-resistant encapsulation as the clear lens lacks inherent UV protection.
A: Yes, the LED will operate at currents as low as 2mA, though luminous intensity will decrease proportionally to current.
A: Follow IPC/JEDEC J-STD-020 guidelines for SMD components - peak reflow temperature should not exceed 260°C for 10 seconds maximum.
A: Yes, the QTLP601CYTR is fully compliant with RoHS 2.0 (Directive 2011/65/EU) and REACH regulations.
Everlight is expected to release enhanced versions with:
Higher brightness variants (up to 60mcd) in the same package
Automotive-grade versions with extended temperature ranges
Thinner profiles for flexible PCB applications
For pricing, samples, or technical support regarding the QTLP601CYTR, contact our component specialists at sales@censtry.com.
