Infrared LEDs and Phototransistors
521 Series Infrared LEDs and Phototransistors
Overview of 521 Series Infrared LEDs and Phototransistors
Dialight’s 521 Series IR LEDs and phototransistors are engineered for high-performance optical sensing, signaling, and non-contact detection. Our IR LEDs emit infrared light in the 850–940 nm wavelength range and are available in both surface-mount (SMD) and through-hole configurations. Optimized for use with matching phototransistors, these components deliver reliable performance in compact and demanding applications.
Features, Benefits and Applications of 521 Series Infrared LEDs and Phototransistors
FEATURES
• Infrared emission wavelengths: 850 nm and 940 nm
• Available in SMD (1.9mm gullwing) and 5mm through-hole (THT) versions
• High radiant intensity with water-clear lenses
• Phototransistors matched for wavelength sensitivity
• RoHS compliant and lead-free
• 3D CAD models and C-drawings available for design support
BENEFITS
• Enables reliable non-contact sensing and remote signaling
• Consistent performance in demanding environments
• Simplifies integration into compact circuit board layouts
• Low power consumption for energy-efficient designs
• Ideal for high-reliability applications in industrial and consumer markets
APPLICATIONS
• Remote controls and IR data transmission
• Industrial automation and safety sensors
• Proximity and object detection sensors
• Optical encoders and positioning systems
• Consumer electronics and smart appliances
• Medical instrumentation and lab diagnostics
• Security systems and motion detectors