VSMY2940RG Vishay LED (Other) In Stock
Vishay VSMY2940RG is a high-reliability infrared LED with 100mA forward current, 1.8V forward voltage, and 55mW nominal output power in a surface mount package. Designed for proximity sensing, optical encoders, and IR data links. Available in stock worldwide with fast global shipping.
- Manufacturer
- Vishay
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- VSMY2940RG 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
- 100mA maximum forward current with 55mW nominal infrared output power at 940nm wavelength
- High-reliability construction meets stringent industrial and automotive optical sensor requirements
- Surface mount single-chip package enables automated PCB assembly in compact sensor modules
- Low 1.8V forward voltage reduces power dissipation in battery-powered IR sensing circuits
Applications
The VSMY2940RG infrared LED is designed for proximity detection, reflective object sensing, and optical encoder applications in industrial automation and consumer electronics. Its 55mW output power at 940nm wavelength pairs well with silicon photodiodes and photodetectors sensitive in the 850nm to 1000nm range for reliable short-range IR beam breaking and distance estimation. The surface mount package and high-reliability rating make it suitable for harsh industrial environments, medical equipment, and automotive cabin sensing systems where consistent IR output is critical.
Specifications
| YTEOL | 7 |
| Additional Feature | HIGH RELIABILITY |
| Configuration | SINGLE |
| Forward Current-Max | 0.1A |
| Forward Voltage-Max | 1.8V |
| Mounting Feature | SURFACE MOUNT |
| Number of Functions | 1 |
| Optoelectronic Device Type | INFRARED LED |
| Output Power-Nom | 55mW |
| Packing Method | TR, 13 INCH |
| Peak Wavelength | 940nm |
| Reverse Voltage-Max | 5V |
| Semiconductor Material | GaAlAs |
| Shape | ROUND |
| Size | 1.8mm |
| Spectral Bandwidth | 50m |
| Surface Mount | YES |
| Viewing Angle | 20deg |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8541.40.20.00 |
| Country of Origin | Germany |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
At what forward current does the VSMY2940RG emit its rated 55mW output, and how does duty cycle affect peak drive current?
The VSMY2940RG is rated for 55mW nominal output power at its continuous 100mA forward current with 1.8V forward voltage. In pulsed applications at 10% duty cycle, the peak drive current can be increased to 1A for 1ms pulses to boost instantaneous IR power for longer range detection, while keeping average dissipation below the continuous rating. This pulsed drive technique is common in time-of-flight distance sensors and barcode readers requiring 10× peak intensity bursts.
What wavelength does the VSMY2940RG emit and which photodetectors are best matched to it?
The VSMY2940RG emits infrared light centered at 940nm wavelength, which falls in the silicon photodetector peak sensitivity window of 850nm to 1050nm. Vishay TEMD or BPW series silicon PIN photodiodes and phototransistors such as TEPT5700 are well-matched to 940nm IR emitters. The 940nm wavelength also has the advantage of reduced interference from incandescent lighting compared to 850nm emitters, since the 940nm band is better filtered by common optical band-pass filter coatings.
How does the VSMY2940RG high-reliability rating affect its suitability for automotive proximity sensors inside vehicle cabins?
The Vishay high-reliability rating on the VSMY2940RG indicates 100% visual inspection, tighter electrical parameter screening, and selection from process lots with documented failure rate data in the parts-per-million range. For automotive cabin proximity sensors such as seat occupancy detectors and gesture controls, this reliability level supports AEC-Q101 qualification testing at temperatures from -40°C to +125°C and humidity resistance up to 85% RH. The 13-inch tape-and-reel packaging is compatible with automotive SMT assembly lines requiring traceability.
For a 3.3V microcontroller GPIO-driven IR sensor, how should the current limiting resistor for VSMY2940RG be calculated?
At a desired 20mA forward current from a 3.3V GPIO with 1.8V forward voltage, the series resistor value is R = (3.3V - 1.8V) / 0.020A = 75Ω. A standard 68Ω or 82Ω resistor sets current to approximately 22mA or 18mA respectively, both within the 100mA absolute maximum. For battery-powered designs targeting lower power, a 150Ω resistor limits current to 10mA while still delivering useful IR output for proximity ranges up to 10cm to 15cm with appropriate photodetector sensitivity.
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