VSLY5940 Vishay LED (Other) In Stock
Vishay VSLY5940 is a high-reliability 940 nm infrared emitter LED in a T-1 3/4 (5 mm) radial package with a narrow 3° beam angle and 55 mW output power. Rated for 100 mA maximum forward current and 1.9 V forward voltage with 10 ns rise and fall times for fast pulsed operation. Available from authorized distributors in stock worldwide.
- Manufacturer
- Vishay
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- VSLY5940 Datasheet PDF
- Category
- LED
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 940 nm peak wavelength with a tight 3° beam angle delivers high radiant intensity over long distances, ideal for remote sensing and optical trigger applications
- 55 mW nominal output power at up to 100 mA forward current provides strong IR signal strength for reliable detection in ambient-light-rich environments
- 10 ns rise and fall times enable fast pulsed operation at high repetition rates, supporting time-of-flight ranging and high-speed optical communication links
Applications
The VSLY5940 is designed for remote control systems, proximity sensing, and optical encoder applications where a narrow 3° beam must illuminate targets at distances exceeding 1 m with minimal beam spread. Its 940 nm wavelength falls outside the visible spectrum, making it invisible to the human eye while remaining compatible with silicon photodiodes and standard IR receiver modules. High-reliability construction suits it for industrial automation, security systems, and medical diagnostic equipment requiring long operational life.
Specifications
| Factory Lead Time | 8Weeks |
| YTEOL | 7 |
| Additional Feature | HIGH RELIABILITY |
| Configuration | SINGLE |
| Forward Current-Max | 0.1A |
| Forward Voltage-Max | 1.9V |
| Mounting Feature | RADIAL MOUNT |
| Number of Functions | 1 |
| Optoelectronic Device Type | INFRARED LED |
| Output Power-Nom | 55mW |
| Packing Method | BULK |
| Peak Wavelength | 940nm |
| Reverse Voltage-Max | 5V |
| Shape | ROUND |
| Size | 5mm |
| Spectral Bandwidth | 35m |
| Surface Mount | NO |
| Viewing Angle | 6deg |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8541.40.20.00 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for VSLY5940:
suggested
suggested
Frequently Asked Questions
How does the 3° beam angle of the VSLY5940 compare to wide-angle IR emitters for distance-sensing applications?
A 3° beam angle concentrates the 55 mW output power into a narrow cone, achieving high radiant intensity at distances beyond 1 m without optical lenses. By contrast, wide-angle IR emitters at 20° to 60° spread the same power over a much larger area, reducing on-axis intensity by the square of the angle ratio. The VSLY5940 is therefore preferred for point-to-point optical links and long-range proximity detectors where beam divergence would otherwise degrade signal-to-noise ratio.
Can the VSLY5940 be driven in pulsed mode at currents above its 100 mA maximum continuous rating to boost peak output?
Yes. IR emitters like the VSLY5940 are commonly driven with short-duration pulses at peak currents of 500 mA to 1 A (check the datasheet absolute maximum for pulse conditions) to achieve much higher instantaneous radiant intensity while keeping average power within thermal limits. The 10 ns rise and fall times support pulse widths as short as 20 ns at repetition rates up to several megahertz, enabling time-of-flight ranging systems and high-speed optical data links.
Why is the 940 nm wavelength of the VSLY5940 preferred over 850 nm in outdoor ambient-light environments?
At 940 nm, solar spectral irradiance is lower than at 850 nm, reducing background noise on paired photodetectors in outdoor installations. IR-cut filter coatings in cameras and standard Si photodiodes also attenuate 940 nm less than visible light, improving signal-to-noise ratio in sunlight. Applications such as outdoor security perimeter sensing and daylight-operation remote controls benefit from the 940 nm peak wavelength with a maximum 1.9 V forward voltage.
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