VSLB4940 High-Speed Infrared Emitting Diode Vishay Semiconductors VSLB4940 High-Speed Infrared Emitting Diode is suitable for high pulse current operation. The VSLB4940 diode offers 940nm peak wavelength, 65mW/sr radiant intensity, ±22° beam angle, 1.42V typical forward voltage, and 15ns fall time. This infrared diode is available in GaAlAs, Multi-quantum Well (MQW) technology, and is molded in a clear plastic package. The VSLB4940 infrared diode comes in a leaded type T-1 package and ∅3mm dimensions. This infrared diode is suitable for applications like infrared remote control units, reflective sensors, and light barriers.